Intrinsic Safety

Solutions

ProtectingInvestments inHazardous AreasWorldwide

1.1

Intr

oduc

tion

Intri

nsic

saf

ety

(IS)

is a

low

-ene

rgy

sign

allin

g te

chni

que

that

pr

even

ts e

xplo

sion

s fro

m o

ccur

ring

by e

nsur

ing

that

the

ene

rgy

trans

ferr

ed to

a h

azar

dous

are

a is

wel

l bel

ow th

e en

ergy

requ

ired

to in

itiat

e an

exp

losi

on.

The

ener

gy

leve

ls

mad

e av

aila

ble

for

sign

allin

g ar

e sm

all

but

usea

ble

and

mor

e th

an

adeq

uate

fo

r th

e m

ajor

ity

of

inst

rum

enta

tion

syst

ems.

The

two

mec

hani

sms

bein

g co

nsid

ered

tha

t co

uld

initi

ate

an

expl

osio

n ar

e:

• A

spa

rk

• A

hot

sur

face

1.2

The

adva

ntag

es o

f int

rinsi

c sa

fety

The

maj

or a

dvan

tage

of i

ntrin

sic

safe

ty is

that

it p

rovi

des

a so

lutio

n to

all

the

prob

lem

s of

haz

ardo

us a

reas

(fo

r eq

uipm

ent

requ

iring

lim

ited

pow

er) a

nd is

the

only

tech

niqu

e w

hich

mee

ts th

is c

riter

ion.

Th

e si

gnifi

cant

fact

ors

are

as fo

llow

s:

a) T

he IS

tech

niqu

e is

acc

epte

d th

roug

hout

the

wor

ld. T

here

is

an i

ncre

asin

g ac

cept

ance

of

inte

rnat

iona

l ce

rtific

ates

iss

ued

unde

r the

IEC

Ex s

chem

e bu

t thi

s ha

s so

me

way

to g

o. In

trins

ic

safe

ty is

an

acce

ptab

le t

echn

ique

in a

ll lo

cal l

egis

latio

n su

ch

as th

e AT

EX D

irect

ives

and

OSH

A. T

he r

elev

ant s

tand

ards

and

co

de o

f pra

ctic

e gi

ve d

etai

led

guid

ance

on

the

desi

gn a

nd u

se

of in

trins

ical

ly s

afe

equi

pmen

t to

a le

vel w

hich

is n

ot a

chie

ved

by a

ny o

f the

oth

er m

etho

ds o

f pro

tect

ion.

b) T

he s

ame

IS e

quip

men

t usu

ally

sat

isfie

s th

e re

quire

men

ts fo

r bo

th d

ust a

nd g

as h

azar

ds.

c) A

ppro

pria

te in

trins

ical

ly s

afe

appa

ratu

s ca

n be

use

d in

all

zone

s. In

par

ticul

ar, i

t is

the

only

sol

utio

n th

at h

as a

sat

isfa

ctor

y hi

stor

y of

saf

ety

for Z

one

0 in

stru

men

tatio

n. T

he u

se o

f lev

els

of

prot

ectio

n (‘i

a’, ‘

ib’ a

nd ‘i

c’) e

nsur

es th

at e

quip

men

t sui

tabl

e fo

r ea

ch le

vel o

f ris

k is

ava

ilabl

e (n

orm

ally

‘ia’

is u

sed

in Z

one

0, ‘i

b’

in Z

one

1 an

d ‘ic

’ in

Zone

2).

d) In

trins

ical

ly s

afe

appa

ratu

s an

d sy

stem

s ar

e us

ually

allo

cate

d a

grou

p IIC

gas

cla

ssifi

catio

n w

hich

ens

ures

that

the

equi

pmen

t is

co

mpa

tible

w

ith

all

gas/

air

mix

ture

s.

Occa

sion

ally

, IIB

sy

stem

s ar

e us

ed, a

s th

is p

erm

its a

hig

her

pow

er le

vel t

o be

us

ed. (

How

ever

, IIB

sys

tem

s ar

e no

t com

patib

le w

ith a

cety

lene

, hy

drog

en a

nd c

arbo

n di

sulfi

de.)

e) A

tem

pera

ture

cla

ssifi

catio

n of

T4

(135

°C)

is n

orm

ally

ac

hiev

ed, w

hich

sat

isfie

s th

e re

quire

men

t for

all

indu

stria

l gas

es

exce

pt c

arbo

n di

sulfi

de (C

S 2) w

hich

, for

tuna

tely

, is

rare

ly u

sed.

f) Fr

eque

ntly

, app

arat

us, a

nd th

e sy

stem

in w

hich

it is

use

d, c

an

be m

ade

‘ia II

C T4

’ at a

n ac

cept

able

cos

t. Th

is re

mov

es c

once

rns

Why

cho

ose

intri

nsic

saf

ety

?

abou

t ar

ea

clas

sific

atio

n,

gas

grou

ping

an

d te

mpe

ratu

re

clas

sific

atio

n in

alm

ost

all

circ

umst

ance

s an

d be

com

es t

he

univ

ersa

l saf

e so

lutio

n.

g) T

he ‘s

impl

e ap

para

tus’

con

cept

allo

ws

man

y si

mpl

e pi

eces

of

appa

ratu

s, su

ch a

s sw

itche

s, th

erm

ocou

ples

, RTD

’s a

nd ju

nctio

n bo

xes

to b

e us

ed in

intri

nsic

ally

saf

e sy

stem

s w

ithou

t the

nee

d fo

r ce

rtific

atio

n. T

his

give

s a

sign

ifica

nt a

mou

nt o

f flex

ibili

ty in

th

e ch

oice

of t

hese

anc

illar

ies.

h) T

he i

ntrin

sic

safe

ty t

echn

ique

is

the

only

tec

hniq

ue t

hat

perm

its li

ve m

aint

enan

ce w

ithin

the

haza

rdou

s ar

ea w

ithou

t the

ne

ed t

o ob

tain

‘gas

cle

aran

ce’ c

ertifi

cate

s. T

his

is p

artic

ular

ly

impo

rtant

fo

r in

stru

men

tatio

n,

sinc

e fa

ult-

findi

ng

on

de-

ener

gise

d eq

uipm

ent i

s di

fficu

lt.

i) Th

e in

stal

latio

n an

d m

aint

enan

ce re

quire

men

ts fo

r int

rinsi

cally

sa

fe a

ppar

atus

are

wel

l doc

umen

ted,

and

con

sist

ent r

egar

dles

s of

lev

el o

f pr

otec

tion.

Thi

s re

duce

s th

e am

ount

of

train

ing

requ

ired

and

decr

ease

s th

e po

ssib

ility

of d

ange

rous

mis

take

s.

j) In

trins

ic sa

fety

per

mits

the

use

of c

onve

ntio

nal in

stru

men

tatio

n ca

bles

, thu

s re

duci

ng c

osts

. Cab

le c

apac

itanc

e an

d in

duct

ance

is

ofte

n pe

rcei

ved

as a

pro

blem

but

, in

fact

, it i

s on

ly a

pro

blem

on

cab

les

long

er th

an 4

00 m

etre

s, in

sys

tem

s in

stal

led

in Z

ones

0

and

1, w

here

IIC

gas

es (

hydr

ogen

) ar

e th

e so

urce

of

risk.

Th

is is

com

para

tivel

y ra

re a

nd, i

n m

ost

circ

umst

ance

s, c

able

pa

ram

eter

s ar

e no

t a p

robl

em.

Fig

ure

1.1

- A

vaila

ble

pow

er c

urve

s

1.3

Avai

labl

e po

wer

Intri

nsic

saf

ety

is f

unda

men

tally

a l

ow e

nerg

y te

chni

que

and

cons

eque

ntly

th

e vo

ltage

, cu

rren

t an

d po

wer

av

aila

ble

is

rest

ricte

d. F

igur

e 1.

1 is

a s

impl

ified

illu

stra

tion

of t

he a

vaila

ble

pow

er in

intri

nsic

ally

saf

e ci

rcui

ts a

nd a

ttem

pts

to d

emon

stra

te

the

type

of

elec

trica

l in

stal

latio

n in

whi

ch t

he i

ntrin

sica

lly s

afe

tech

niqu

e is

app

licab

le.

The

blue

and

gre

en c

urve

s ar

e th

e ac

cept

ed d

esig

n cu

rves

use

d to

avo

id s

park

igni

tion

by re

sist

ive

limite

d ci

rcui

ts in

Gro

up II

C an

d IIB

gas

es. T

he ‘i

c’ c

urve

s ar

e le

ss s

ensi

tive

beca

use

they

do

not

requ

ire th

e ap

plic

atio

n of

a s

afet

y fa

ctor

in th

e sa

me

way

as

for

‘ia’ a

nd ‘i

b’ e

quip

men

t. In

gen

eral

the

max

imum

vol

tage

ava

ilabl

e is

set

by

cabl

e ca

paci

tanc

e (4

00 m

etre

s co

rres

pond

s to

80n

F w

hich

has

a p

erm

issi

ble

volta

ge o

f 29V

in ‘I

IC ia

’ circ

uits

) and

the

max

imum

cur

rent

by

cabl

e in

duct

ance

(400

met

res

corr

espo

nds

to 4

00μH

whi

ch h

as a

per

mis

sibl

e cu

rren

t of

300

mA

in I

IC i

a ci

rcui

ts).

A fre

quen

tly u

sed

limita

tion

on p

ower

is th

e 1.

3W, w

hich

ea

sily

per

mits

a T

4 (1

35°C

) te

mpe

ratu

re c

lass

ifica

tion.

The

se

limits

are

all

show

n in

Fig

ure

1.1.

A si

mpl

e ap

proa

ch is

to s

ay th

at if

the

appa

ratu

s ca

n be

ope

rate

d fro

m a

sou

rce

of p

ower

who

se o

utpu

t par

amet

ers

are

with

in th

e (b

lue)

hat

ched

are

a th

en it

can

rea

dily

be

mad

e in

trins

ical

ly s

afe

to ‘

IIC ia

T4’

sta

ndar

ds. I

f the

par

amet

ers

exce

ed th

ese

limits

to

a lim

ited

degr

ee th

en it

can

pro

babl

y be

mad

e in

trins

ical

ly s

afe

to

IIB o

r ‘ic

’ req

uire

men

ts.

The

first

cho

ice,

how

ever

, is

alw

ays

to c

hoos

e ‘II

C ia

T4’

equ

ipm

ent,

if it

prov

ides

ade

quat

e po

wer

and

is a

n ec

onom

ic c

hoic

e, a

s th

is

equi

pmen

t ca

n be

use

d in

all

circ

umst

ance

s (e

xcep

t if

carb

on

disu

lfide

(CS

2) is

the

haz

ardo

us g

as,

in w

hich

cas

e th

ere

are

othe

r pro

blem

s).

In p

ract

ice

alm

ost a

ll lo

w v

olta

ge in

stru

men

tatio

n ca

n be

mad

e ‘II

B ic

T4’

as

the

limits

are

set

by

the

leas

t se

nsiti

ve o

f th

e ig

nitio

n cu

rves

in F

igur

e 1.

1 (ty

pica

lly 2

4V 5

00 m

A). T

he ‘I

IB ic

’ sp

ecifi

catio

n do

es r

estri

ct a

pplic

atio

n to

Zon

e 2

and

whe

re t

he

haza

rdou

s ga

s is

not

hyd

roge

n, a

cety

lene

or c

arbo

n di

sulfi

de b

ut

is s

till a

pplic

able

to a

larg

e ra

nge

of in

stal

latio

ns.

1.4

Conc

lusi

onIn

trins

ic

safe

ty

is

the

natu

ral

choi

ce

for

all

low

vo

ltage

in

stru

men

tatio

n pr

oble

ms.

Ade

quat

e so

lutio

ns e

xist

whi

ch a

re

com

patib

le w

ith a

ll ga

ses

and

area

cla

ssifi

catio

ns. T

he te

chni

que

prev

ents

exp

losi

ons

rath

er t

han

reta

ins

them

whi

ch m

ust

be

pref

erab

le, a

nd th

e ‘li

ve m

aint

enan

ce’ f

acili

ty e

nabl

es c

onve

ntio

nal

inst

rum

ent p

ract

ice

to b

e us

ed.

1.

23

“App

ropr

iate

intr

insi

cally

saf

e ap

para

tus

can

be u

sed

in a

ll zo

nes”

MTL4500 In

stal

latio

n.

Tabl

e 2.

1 sh

ows a

repr

esen

tativ

e ga

s for

eac

h gr

oup

and

the

min

imum

en

ergy

requ

ired

to ig

nite

it. II

C is

clear

ly th

e m

ost s

ensit

ive. A

ppar

atus

ca

n be

des

igne

d to

be

acce

ptab

ly s

afe

in a

ny o

f th

ese

grou

ps.

Usua

lly a

ppar

atus

is d

esig

ned

to b

e sa

fe in

IIC,

bec

ause

it c

an th

en

be u

sed

in a

ny g

as a

tmos

pher

e. S

omet

imes

a II

B cl

assi

ficat

ion

is

used

as

this

per

mits

slig

htly

hig

her

pow

ers

to b

e av

aila

ble.

Onl

y ve

ry ra

rely

how

ever

is a

ppar

atus

des

igne

d fo

r the

IIA

clas

sific

atio

n be

caus

e th

is re

stric

ts it

s us

e to

this

gro

up a

lone

.Ap

para

tus i

s usu

ally

ass

esse

d us

ing

the

curv

es a

nd ta

bles

incl

uded

in

the

appa

ratu

s st

anda

rd w

hich

list

s ac

cept

able

leve

ls o

f cur

rent

an

d vo

ltage

. Mor

e co

mpl

ex c

ircui

ts a

re c

heck

ed w

ith ‘s

park

test

’ ap

para

tus;

nor

mal

ly th

e pr

eser

ve o

f cer

tifyi

ng a

utho

ritie

s.

2.8

Tem

pera

ture

cla

ssifi

catio

nTh

e se

cond

met

hod

of c

ausi

ng a

n ex

plos

ion

is n

orm

ally

con

side

red

to b

e ig

nitio

n by

a h

ot s

urfa

ce. W

hen

a ga

s is

hea

ted

abov

e its

ig

nitio

n te

mpe

ratu

re i

t m

ay s

pont

aneo

usly

ign

ite.

The

igni

tion

tem

pera

ture

var

ies

with

the

gas

and

is n

ot c

orre

late

d to

igni

tion

ener

gy. C

onse

quen

tly, w

hen

sele

ctin

g ap

para

tus,

bot

h pr

oper

ties

of th

e ex

plos

ive

gas

have

to b

e co

nsid

ered

.Ap

para

tus

is c

lass

ified

into

tem

pera

ture

(‘T’

) cla

sses

dep

endi

ng o

n its

max

imum

per

mitt

ed s

urfa

ce te

mpe

ratu

re.

Tab

le 2

.2 T

he ‘T’

cla

sses

The

stan

dard

ena

bles

alm

ost a

ll ap

para

tus,

diss

ipat

ing

not m

ore

than

1.

3W, to

be a

lloca

ted

a tem

pera

ture

clas

sifica

tion

of T4

(135

°C). A

lmos

t al

l int

rinsic

ally

safe

fiel

d m

ount

ed a

ppar

atus

mee

ts th

e re

quire

men

ts

of T

4 te

mpe

ratu

re c

lass

ifica

tion,

whi

ch p

erm

its it

s us

e in

all

indu

stria

l ga

s at

mos

pher

es e

xcep

t in

thos

e co

mpr

ising

car

bon

disu

lfide

(CS 2)

and

air.

Thes

e re

quire

a T

6 cla

ssifi

catio

n, w

hich

is d

ifficu

lt to

ach

ieve

at

hig

h am

bien

t te

mpe

ratu

res.

Ther

e ar

e al

so t

oxic

ity p

robl

ems

asso

ciat

ed w

ith c

arbo

n di

sulfi

de.

The

othe

r tem

pera

ture

that

nee

ds to

be

cons

ider

ed fo

r eac

h pi

ece

of

appa

ratu

s is i

ts a

mbi

ent t

empe

ratu

re ra

ting,

whi

ch d

oes d

irect

ly af

fect

th

e sa

fety

of t

he a

ppar

atus

in s

ever

al w

ays.

Appa

ratu

s no

rmal

ly m

ount

ed i

n th

e sa

fe a

rea

but

whi

ch a

ffect

s th

e sa

fety

of

the

intri

nsic

ally

safe

sys

tem

(su

ch a

s th

e in

trins

ical

ly

safe

inte

rface

in F

igur

e 2.

1) is

cal

led

‘ass

ocia

ted

appa

ratu

s’. S

uch

appa

ratu

s do

es n

ot n

eed

to b

e te

mpe

ratu

re c

lass

ified

but

mus

t be

used

with

in it

s sp

ecifi

ed a

mbi

ent t

empe

ratu

re ra

nge.

2.1

Defin

ition

of I

ntrin

sic

Safe

tyTh

e de

finiti

on

of

intri

nsic

sa

fety

us

ed

in

the

rele

vant

IE

C ap

para

tus

stan

dard

IEC

6007

9-11

is a

‘typ

e of

pro

tect

ion

base

d on

the

res

trict

ion

of e

lect

rical

ene

rgy

with

in a

ppar

atus

and

of

inte

rcon

nect

ing

wiri

ng

expo

sed

to

the

pote

ntia

lly

expl

osiv

e at

mos

pher

e to

a l

evel

bel

ow t

hat

whi

ch c

an c

ause

ign

ition

by

eith

er s

park

ing

or h

eatin

g ef

fect

s’. T

his

is a

con

cise

sta

tem

ent o

f in

tent

to in

trodu

ce a

mul

ti-fa

cete

d su

bjec

t.

2.2

Typi

cal i

ntrin

sica

lly s

afe

syst

emFi

gure

2.1

illu

stra

tes

a ty

pica

l int

rinsi

cally

saf

e (IS

) sys

tem

whe

re

the

safe

per

form

ance

of

each

pie

ce o

f ap

para

tus

is d

epen

dent

on

the

inte

grity

of a

ll th

e eq

uipm

ent i

n th

e sy

stem

. For

exa

mpl

e,

the

safe

ty o

f the

Tem

pera

ture

Tra

nsm

itter

(Tx)

dep

ends

upo

n th

e am

ount

of e

nerg

y su

pplie

d by

the

IS In

terfa

ce.

In m

ost p

roce

ss c

ontro

l app

licat

ions

, eac

h pi

ece

of a

ppar

atus

ina

syst

em is

indi

vidu

ally

certi

fied.

A d

ocum

ent t

hat c

onfir

ms t

he sa

fety

of

the

who

le s

yste

m is

then

pro

duce

d us

ing

the

info

rmat

ion

from

th

e in

divi

dual

app

arat

us c

ertifi

cate

s, in

acc

orda

nce

with

the

syst

em

stan

dard

IEC

6007

9-25

. Thi

s sy

stem

doc

umen

t als

o in

clud

es d

etai

ls

of c

able

type

s an

d si

mpl

e ap

para

tus

used

in th

e sy

stem

.It

is i

mpo

rtant

to

reco

gnis

e th

at w

here

pie

ces

of i

ntrin

sica

lly

safe

app

arat

us a

re in

terc

onne

cted

, it i

s th

e sa

fety

of t

he s

yste

m

that

mus

t be

est

ablis

hed.

The

re a

re h

owev

er s

ome

exam

ples

of

appa

ratu

s w

hich

sta

nd a

lone

, suc

h as

mob

ile ra

dios

and

por

tabl

e ga

s de

tect

ors,

whe

re th

e sy

stem

app

roac

h is

not

rele

vant

.

2.3

Leve

ls o

f pro

tect

ion

Intri

nsic

saf

ety

utili

ses

thre

e le

vels

of

prot

ectio

n, ‘

ia’,

‘ib’

and

‘ic’

whi

ch a

ttem

pt t

o ba

lanc

e th

e pr

obab

ility

of

an e

xplo

sive

at

mos

pher

e be

ing

pres

ent

agai

nst

the

prob

abili

ty o

f an

ign

ition

ca

pabl

e si

tuat

ion

occu

rrin

g.

An In

trodu

ctio

n to

Intri

nsic

Saf

ety

‘ia

’

This

offe

rs th

e hig

hest

leve

l of p

rote

ctio

n an

d is

gen

eral

ly co

nsid

ered

as

bei

ng a

dequ

atel

y sa

fe fo

r use

in th

e m

ost h

azar

dous

loca

tions

(Z

one

0) b

ecau

se th

e po

ssib

ility

of t

wo

‘faul

ts’ (

see

oppo

site

) and

a

fact

or o

f saf

ety

of 1

.5 is

con

side

red

in th

e as

sess

men

t of s

afet

y.

‘ib

’

‘ib’

appa

ratu

s, w

hich

is

adeq

uate

ly s

afe

with

one

fau

lt an

d a

fact

or o

f saf

ety

of 1

.5 is

con

side

red

safe

for u

se in

less

freq

uent

ly

haza

rdou

s ar

eas

(Zon

e 1)

.

‘ic’

‘ic’ a

ppar

atus

whi

ch is

ass

esse

d in

‘nor

mal

ope

ratio

n’ w

ith a

uni

ty

fact

or o

f saf

ety

is g

ener

ally

acc

epta

ble

in in

frequ

ently

haz

ardo

us

area

s (Z

one

2). T

he ‘i

c’ c

once

pt is

rel

ativ

ely

new

(200

5) a

nd w

ill

repl

ace

the

‘ene

rgy-

limite

d’ (

nL)

of t

he t

ype

‘n’

stan

dard

IEC

60

079-

15 a

nd p

ossi

bly

the

‘non

-ince

ndiv

e’ c

once

pt o

f No

rth

Amer

ican

sta

ndar

ds.

It is

usu

al fo

r a

syst

em to

be

allo

cate

d a

leve

l of p

rote

ctio

n as

a

who

le, d

epen

ding

on

the

leve

l of

prot

ectio

n of

the

app

arat

us in

th

e sy

stem

. How

ever

it is

pos

sibl

e fo

r di

ffere

nt p

arts

of a

sys

tem

to

hav

e di

ffere

nt le

vels

of

prot

ectio

n w

here

sui

tabl

e se

greg

atio

n ex

ists

. Thi

s m

ust b

e m

ade

clea

r in

the

syst

em d

ocum

enta

tion.

Fig

ure

2.1

- T

ypic

al IS

sys

tem

2.

2.4

Faul

tsIf

a fa

ult

can

adve

rsel

y af

fect

the

saf

ety

of t

he e

quip

men

t it

is

calle

d a

‘cou

ntab

le’

faul

t. Th

e si

tuat

ion

is f

urth

er c

ompl

icat

ed

beca

use

the

appa

ratu

s st

anda

rd p

erm

its s

ome

spec

ially

des

igne

d co

mpo

nent

s to

be

rega

rded

as

infa

llibl

e an

d so

me

inad

equa

tely

de

sign

ed fe

atur

es to

be

faile

d in

nor

mal

ope

ratio

n. C

onse

quen

tly

ther

e ar

e fa

ults

that

are

not

con

side

red

to h

appe

n, fa

ults

, whi

ch

are

coun

ted,

and

faul

ts, w

hich

are

impo

sed

but n

ot c

ount

ed.

One

of t

he m

ajor

adv

anta

ges

of i

ntrin

sic

safe

ty i

s th

at ‘

live

mai

nten

ance

’ on

equi

pmen

t is

perm

itted

with

out t

he n

eces

sity

of

obta

inin

g ‘g

as c

lear

ance

’ cer

tifica

tes.

A c

onse

quen

ce o

f thi

s is

that

du

ring

the

safe

ty a

naly

sis

the

poss

ibili

ty o

f op

en c

ircui

ting

and

shor

t-ci

rcui

ting

any

field

wiri

ng is

rega

rded

as

norm

al o

pera

tion.

Fortu

nate

ly u

nder

stan

ding

the

app

arat

us s

tand

ard

and

faul

ts i

s on

ly n

eces

sary

for a

ppar

atus

des

igne

rs a

nd c

ertif

ying

aut

horit

ies.

Th

e ap

para

tus

certi

ficat

es re

mov

e th

e ne

cess

ity to

con

side

r fau

lts,

exce

pt fo

r fiel

d w

iring

faul

ts, i

n sy

stem

des

ign.

2.5

Sim

ple

appa

ratu

sIn

gen

eral

, int

rinsi

cally

saf

e ap

para

tus

is c

ertifi

ed; u

sual

ly b

y an

in

depe

nden

t bod

y su

ch a

s an

Acc

redi

ted

Certi

ficat

ion

Body

(ACB

) un

der t

he IE

C Ex

sch

eme.

Sel

f-ce

rtific

atio

n by

the

man

ufac

ture

r of

‘ic’ e

quip

men

t is

also

qui

te c

omm

only

acc

epte

d.Th

e ex

cept

ion

to th

e ru

le is

‘sim

ple

appa

ratu

s’, w

hich

is c

onsi

dere

d no

t to

app

reci

ably

affe

ct t

he i

ntrin

sic

safe

ty o

f th

e sy

stem

. Th

is

appa

ratu

s is

exe

mpt

ed f

rom

the

req

uire

men

t fo

r ce

rtific

atio

n. T

he

sim

ple

requ

irem

ents

are

cle

arly

spe

cifie

d in

the

appa

ratu

s st

anda

rd.

‘Sim

ple

appa

ratu

s’ s

houl

d al

way

s be

rea

dily

dem

onst

rabl

e to

be

adeq

uate

ly s

afe.

The

usu

al e

xam

ples

are

sw

itche

s, th

erm

ocou

ples

, RT

D’s

and

junc

tion

boxe

s.

2.6

Cabl

esBe

caus

e ca

bles

hav

e in

duct

ance

and

cap

acita

nce,

and

hen

ce

ener

gy s

tora

ge c

apab

ilitie

s, th

ey c

an a

ffect

sys

tem

saf

ety.

Cons

eque

ntly

the

sys

tem

des

ign

impo

ses

rest

rictio

ns o

n th

e am

ount

of e

ach

of th

ese

para

met

ers.

A g

reat

dea

l has

bee

n w

ritte

n on

this

sub

ject

but

onl

y ra

rely

is th

ere

a se

rious

lim

itatio

n pl

aced

on

the

avai

labl

e ca

ble.

As c

able

faul

ts a

re ta

ken

into

acc

ount

dur

ing

the

syst

em a

naly

sis,

th

e ty

pe o

f cab

le in

indi

vidu

al in

stal

latio

ns is

not

clo

sely

spe

cifie

d in

the

syst

em s

tand

ard.

The

cho

ice

is th

eref

ore

dete

rmin

ed b

y th

e ne

ed fo

r rel

iabl

e sy

stem

ope

ratio

n.W

here

int

rinsi

cally

saf

e sy

stem

s ar

e co

mbi

ned

in a

mul

ti-co

re,

then

the

re a

re s

peci

al r

equi

rem

ents

. Th

ese

dete

rmin

e w

hich

ad

ditio

nal f

aults

hav

e to

be

cons

ider

ed.

2.7

Gas

clas

sific

atio

nTh

e am

ount

of e

nerg

y re

quire

d to

igni

te a

par

ticul

ar g

as/a

ir m

ixtu

re

varie

s fo

r ea

ch g

as. I

ndus

trial

gas

es c

apab

le o

f bei

ng ig

nite

d ar

e di

vide

d, in

the

UK, i

nto

thre

e cl

asse

s, II

A, II

B an

d IIC

.

Typ

ica

l G

as

G

as

Gro

up

Ig

nit

ion

en

erg

y

Met

hane

IIA

16

0μJ

Ethy

lene

IIB

80

μJHy

drog

en

IIC

20μJ

Tab

le 2

.1: Ty

pic

al g

ase

s, t

heir

cla

ssifi

cati

on

& ig

nit

ion

en

erg

ies

T1

T2

T3

T4

T5

T6

450°

C

300°

C

200°

C

135°

C

100°

C

80°C

45

2.9

Cate

gorie

s an

d eq

uipm

ent s

afet

y le

vels

Whe

n th

e Eu

rope

an D

irect

ive

(ATE

X) f

or a

ppar

atus

for

use

in

haza

rdou

s ar

eas

(94/

9/EC

) was

cre

ated

, it i

ntro

duce

d th

e co

ncep

t of

cat

egor

ies,

whi

ch w

as in

tend

ed to

cla

rify

the

Zone

(s) i

n w

hich

ap

para

tus c

ould

safe

ly b

e us

ed. U

nfor

tuna

tely

, and

for n

othi

ng m

ore

than

ped

antic

reas

ons,

it w

as d

ecid

ed th

at a

cat

egor

y 0

wou

ld n

ot

be u

sed

and

the

resu

lt w

as t

he c

onfu

sing

situ

atio

n ill

ustra

ted

in

Tabl

e 2.

3, w

here

the

cate

gory

and

Zon

e nu

mbe

rs d

iffer

.M

ore

rece

ntly

(200

4) th

e IE

C to

ok u

p th

e co

ncep

t of i

dent

ifyin

g th

e le

vel o

f pro

tect

ion

offe

red

by a

pie

ce o

f app

arat

us a

nd a

lso

paid

a

little

mor

e at

tent

ion

to ri

sk a

naly

sis

as a

met

hod

of d

eter

min

ing

the

acce

ptab

le u

se o

f equ

ipm

ent.

The

resu

lt w

as th

e cr

eatio

n of

eq

uipm

ent

prot

ectio

n le

vels

(EP

Ls),

whi

ch a

re s

imila

r to

ATE

X ca

tego

ries

but

have

num

bers

tha

t al

ign

with

the

ir no

rmal

Zon

es

of u

se.

In p

ract

ice

both

cat

egor

ies

and

EPLs

alig

n w

ith t

he l

evel

s of

pr

otec

tion

‘ia’,

‘ib’

and

‘ic’

as in

dica

ted

in T

able

2.3

and

, as

far

as in

trins

ic s

afet

y is

con

cern

ed, t

hey

can

larg

ely

be ig

nore

d, a

s th

e le

vel o

f pr

otec

tion

is a

lread

y de

fined

as

‘ia’,

‘ib’ o

r ‘ic

’. Th

ey

do h

owev

er a

ppea

r on

app

arat

us m

arki

ng a

nd c

ertifi

cate

s an

d co

nseq

uent

ly n

eed

to b

e ex

plai

ned.

2.10

Sum

mar

yIn

trins

ic s

afet

y of

fers

an

acce

ptab

le le

vel o

f saf

ety

in a

ll ha

zard

ous

loca

tions

. Arg

uabl

y it

is s

afer

and

less

pro

ne to

acc

iden

tal e

rror

s th

an o

ther

met

hods

of p

rote

ctio

n. T

his

com

bine

d w

ith it

s fle

xibl

e us

e of

ava

ilabl

e ap

para

tus

and

the

abili

ty t

o do

‘liv

e w

orki

ng’

mea

ns t

hat

it is

the

nat

ural

cho

ice

for

inst

rum

enta

tion

syst

ems

in h

azar

dous

are

as. F

or e

xam

ple

it is

the

only

tech

niqu

e w

hich

is

read

ily a

pplic

able

to Z

one

0 lo

catio

ns.

The

intro

duct

ion

of t

he ‘

ic’

conc

ept

com

plet

es t

he p

ictu

re. T

he

esse

ntia

l req

uire

men

ts o

f an

intri

nsic

ally

saf

e sy

stem

are

:

• T

he s

yste

m m

ust w

ork.

• T

he a

ppar

atus

in th

e sy

stem

mus

t be

‘cer

tified

’ or ‘

sim

ple’

.•

The

com

patib

ility

of t

he a

ppar

atus

mus

t be

esta

blis

hed.

• T

he le

vel o

f pro

tect

ion

of th

e sy

stem

est

ablis

hed.

• T

he te

mpe

ratu

re c

lass

ifica

tion

and

ambi

ent t

empe

ratu

re

ratin

g of

eac

h pi

ece

of a

ppar

atus

est

ablis

hed.

• T

he re

quire

men

ts o

f the

cab

le e

stab

lishe

d.

Leve

l of

Pro

tecti

on

C

ou

nta

ble

Fa

ult

s

ATE

X C

ate

gory

IE

C E

PL

Norm

al Z

on

e o

f U

se

ia

2 1

0

0

ib

1

2

1

1ic

0

3

2

2

Tab

le 2

.3 R

elat

ions

hips

bet

wee

n di

ffere

nt m

etho

ds o

f ass

essi

ng s

afet

y le

vels

3.1

Gene

ral

The

long

ter

m c

ontin

ued

safe

ty o

f an

int

rinsi

cally

saf

e sy

stem

de

pend

s on

ade

quat

e in

spec

tion

and

mai

nten

ance

. The

rel

evan

t IE

C st

anda

rd i

s IE

C 60

079-

17,

whi

ch d

eals

com

preh

ensi

vely

w

ith a

ll m

etho

ds o

f pr

otec

tion.

Whe

re i

nsta

llatio

ns a

re r

equi

red

to c

ompl

y w

ith t

he E

urop

ean

‘use

r’ Di

rect

ive

1999

/92/

EC a

do

cum

ente

d in

spec

tion

proc

edur

e be

com

es a

par

t of t

he re

quire

d ris

k an

alys

is.

Any

wor

k on

a h

azar

dous

pla

nt n

eeds

to ta

ke in

to a

ccou

nt o

vera

ll pl

ant s

afet

y. C

onse

quen

tly it

is n

eces

sary

to c

ompl

y w

ith th

e sa

fety

pr

actic

es o

f th

e pa

rticu

lar

inst

alla

tion

(for

exam

ple

wor

k pe

rmits

), ev

en th

ough

the

risk

of ig

nitio

n fro

m th

e in

trins

ical

ly s

afe

circ

uits

is

min

imal

, and

gas

cle

aran

ce c

ertifi

cate

s ar

e no

t nec

essa

ry. I

n so

me

way

s th

is is

eve

n m

ore

impo

rtant

in th

e pr

e-co

mm

issi

onin

g st

age.

If th

ere

are

sign

ifica

nt c

hang

es in

the

pla

nt o

pera

tion,

whi

ch f

or

exam

ple

mod

ify t

he a

rea

clas

sific

atio

n th

en t

he s

afet

y an

alys

is

mus

t be

revi

ewed

, the

doc

umen

tatio

n m

odifi

ed, a

nd p

ossi

bly

the

insp

ectio

n pr

oced

ure

chan

ged

and/

or re

peat

ed.

The

proc

edur

e pl

aces

the

onus

for e

nsur

ing

that

the

equi

pmen

t use

d is

sui

tabl

e fo

r its

loca

tion

on th

e cr

eato

r of t

he in

stal

latio

n dr

awin

g.Th

e na

ture

of a

n in

spec

tion

depe

nds

on h

ow w

ell t

he in

stal

latio

n dr

awin

g, w

hich

cha

nges

the

syst

em d

esig

n dr

awin

g in

to a

dra

win

g sp

ecifi

c to

a p

artic

ular

inst

alla

tion,

has

bee

n ca

rrie

d ou

t.If

the

docu

men

tatio

n is

inad

equa

te th

en a

ny in

spec

tion

can

only

be

carr

ied

out b

y so

meo

ne w

ith d

etai

led

know

ledg

e of

the

plan

t and

ex

cept

iona

l exp

ertis

e in

haz

ardo

us a

rea

prac

tice.

Bec

ause

suc

h a

pers

on ra

rely

exi

sts,

this

ana

lysi

s as

sum

es th

at th

e do

cum

enta

tion

is a

dequ

ate,

and

use

s Fi

gure

3.1

to il

lust

rate

the

proc

ess.

If th

e pe

rson

doi

ng a

n in

spec

tion

does

not

und

erst

and

som

e as

pect

of

the

draw

ing,

or b

elie

ves

it co

uld

be w

rong

, the

n th

ey s

houl

d be

en

cour

aged

to q

uest

ion

the

docu

men

t. IE

C 60

079-

17 re

quire

s th

e

Inst

alla

tion

& In

spec

tion

of IS

app

arat

us

- A

n in

trodu

ctio

n

iden

tifica

tion

of ‘a

tech

nica

l per

son

with

exe

cutiv

e fu

nctio

n’ to

be

resp

onsi

ble

for i

nspe

ctio

n re

late

d m

atte

rs in

eac

h in

stal

latio

n. T

his

pers

on s

houl

d be

kno

wn

to t

he t

echn

icia

n do

ing

the

insp

ectio

n,

and

shou

ld b

e av

aila

ble

and

able

to a

nsw

er q

uest

ions

.Th

e in

stal

latio

n dr

awin

g sh

ould

tak

e in

to a

ccou

nt w

hat

can

be

chec

ked

on t

he i

nsta

llatio

n. F

or e

xam

ple,

quo

ting

perm

issi

ble

capa

cita

nce

and

indu

ctan

ce f

or a

cab

le i

s no

t us

eful

, be

caus

e al

thou

gh it

is p

ossi

ble

to c

heck

thes

e pa

ram

eter

s, it

is n

ot e

asy

to d

o so

. Sta

ting

an a

ccep

tabl

e ty

pe a

nd le

ngth

is m

uch

mor

e us

eful

.Th

e us

e of

info

rmat

ion

avai

labl

e fro

m ‘i

ntel

ligen

t’ in

stru

men

ts c

an

cons

ider

ably

red

uce

the

rout

ine

insp

ectio

n co

nsid

ered

nec

essa

ry

on a

n in

trins

ical

ly s

afe

syst

em.

The

use

of t

his

inte

llige

nce

to

redu

ce th

e in

spec

tion

requ

irem

ent i

s re

cogn

ised

in IE

C600

79-1

7 cl

ause

5.3

.1 b

ut n

ot d

iscu

ssed

in d

etai

l.Th

e ab

ility

to i

dent

ify a

spe

cific

fiel

d in

stru

men

t fro

m t

he s

afe

area

, with

out

havi

ng t

o go

and

rea

d th

e la

bel o

n th

e in

stru

men

t, is

a s

igni

fican

t ad

vant

age.

Alm

ost

all

of t

he d

igita

l, “i

ntel

ligen

t”

inst

rum

ents

(HAR

T, Fo

unda

tion

Fiel

dbus

, etc

) ena

ble

the

seria

l num

ber

of a

n in

stru

men

t to

be re

ad re

mot

ely.

The

com

pute

r rec

ord

can

then

be

use

d to

con

firm

that

it is

the

spec

ified

inst

rum

ent,

thus

ens

urin

g it

satis

fies

all t

he re

quire

men

ts o

f the

par

ticul

ar in

stal

latio

n.Th

is t

ype

of c

heck

can

be

done

at

frequ

ent

inte

rval

s w

ithou

t in

terfe

ring

with

ope

ratio

nal

requ

irem

ents

. Th

e in

spec

tion

of a

n in

stru

men

t is

then

red

uced

to lo

okin

g fo

r m

echa

nica

l dam

age

or

exce

ssiv

e co

rros

ion

whi

ch is

com

para

tivel

y ea

sy a

nd s

igni

fican

tly

less

tedi

ous.

Fig

ure

3.1

- T

ypic

al in

stal

latio

n dr

awin

g fo

r IS

syst

em

3.

MTL4500/5

500 b

ackp

lane

and

DIN

-rai

l mou

nted

saf

ety

isol

ator

s.

67

3.1

Gene

ral -

con

tinue

d A

rem

ote

chec

k th

at th

e in

stru

men

t is

func

tioni

ng c

orre

ctly

doe

s no

t nec

essa

rily

ensu

re th

at it

is s

till s

afe

but i

t doe

s co

nfirm

that

it

has

not b

een

sign

ifica

ntly

dam

aged

and

is p

roba

bly

still

saf

e.Th

is d

oes

impl

y th

at a

ny m

alfu

nctio

n sh

ould

be

quic

kly

corr

ecte

d or

the

def

ectiv

e eq

uipm

ent

rem

oved

or

at l

east

mad

e sa

fe.

A fre

quen

t ch

eck

on f

unct

iona

lity

is a

sig

nific

ant

fact

or i

n fu

rther

re

duci

ng th

e ris

k as

soci

ated

with

any

haz

ardo

us a

rea

appa

ratu

s.Ho

w fa

r thi

s typ

e of

aut

omat

ic in

spec

tion

can

sim

plify

the

insp

ectio

n pr

oced

ure

is a

dec

isio

n fo

r the

end

-use

r. Bu

t it i

s ar

guab

ly a

mor

e re

liabl

e te

chni

que

than

man

ual

insp

ectio

n an

d si

mpl

ifies

the

re

cord

ing

of t

he p

roce

ss.

A re

lativ

ely

sim

ple

com

pute

r sy

stem

ca

n gi

ve r

eady

acc

ess

to t

he r

elev

ant

inst

alla

tion

and

syst

em

draw

ings

, whi

ch m

ay b

e re

quire

d if

furth

er in

vest

igat

ion

is th

ough

t to

be

nece

ssar

y.So

me

user

s m

ay c

onsi

der

it de

sira

ble

to d

o an

occ

asio

nal

thor

ough

spo

t che

ck a

s re

assu

ranc

e th

at th

e sy

stem

is fu

nctio

ning

bu

t th

is is

a c

ouns

el o

f pe

rfect

ion.

The

se t

echn

ique

s, c

ombi

ned

with

the

avai

labi

lity

of c

ertifi

cate

s an

d m

anua

ls o

n m

anuf

actu

rers

’ w

eb s

ites,

can

lead

to

safe

r in

stal

latio

ns a

nd a

red

uctio

n in

the

bu

reau

crat

ic lo

ad c

reat

ed b

y sa

fety

legi

slat

ion.

3.2

Initi

al in

spec

tion

An in

itial

insp

ectio

n to

ens

ure

that

the

inst

alla

tion

com

plie

s w

ith

the

inst

alla

tion

draw

ing

is c

ritic

al. W

here

an

adeq

uate

dra

win

g su

ch a

s Fi

gure

3.1

exi

sts,

the

initi

al in

spec

tion

shou

ld e

nsur

e th

at

the

actu

al in

stal

latio

n co

nfor

ms

to th

e dr

awin

g.Us

ually

this

invo

lves

che

ckin

g ea

ch in

divi

dual

loop

sta

ge b

y st

age,

w

hich

invo

lves

a g

ood

deal

of o

peni

ng e

nclo

sure

s an

d cl

ambe

ring

over

stru

ctur

es. W

here

the

tech

nici

an in

volv

ed is

sui

tabl

y qu

alifi

ed

this

ins

pect

ion

can

be c

ombi

ned

with

the

ope

ratio

nal

chec

ks.

How

ever

som

e or

gani

satio

ns s

epar

ate

the

two

requ

irem

ents

, pr

efer

ring

‘inde

pend

ent’

safe

ty in

spec

tions

.Th

is s

epar

atio

n of

fun

ctio

ns is

not

con

duci

ve t

o sh

orte

ning

sta

rt up

tim

es.

Freq

uent

ly

the

initi

al

insp

ectio

n de

mon

stra

tes

the

inad

equa

cy o

f pla

nt la

belli

ng, a

nd th

e op

portu

nity

to im

prov

e th

is

feat

ure

shou

ld n

ot b

e m

isse

d.

3.3

Perio

dic

insp

ectio

nsTh

e ob

ject

ive

of p

erio

dic

insp

ectio

ns is

to e

nsur

e th

e sy

stem

has

no

t ap

prec

iabl

y de

terio

rate

d an

d ha

s no

t be

en m

odifi

ed i

n an

un

auth

oris

ed w

ay. T

he re

quire

d fre

quen

cy o

f per

iodi

c in

spec

tions

is

influ

ence

d by

man

y fa

ctor

s, s

uch

as th

e im

med

iate

env

ironm

ent,

the

pres

ence

of

corr

osiv

e at

mos

pher

es a

nd t

he s

usce

ptib

ility

to

mec

hani

cal d

amag

e. A

usu

al s

tarti

ng p

oint

is to

con

side

r a th

ree-

year

cyc

le, i

nspe

ctin

g a

third

of

the

appa

ratu

s ev

ery

year

. If

the

insp

ectio

n sh

ows

wid

espr

ead

dete

riora

tion

then

the

ins

pect

ion

perio

d sh

ould

be

shor

tene

d an

d re

med

ial a

ctio

n ta

ken.

Esta

blis

hing

that

the

inte

nded

app

arat

us is

stil

l in

plac

e is

rela

tivel

y ea

sy p

rovi

ding

that

the

appa

ratu

s ha

s a

uniq

ue id

entit

y.Us

ually

the

man

ufac

ture

rs t

ype

num

ber

is a

dequ

ate.

Muc

h ha

s be

en w

ritte

n ab

out c

heck

ing

the

mar

king

on

the

labe

ls b

ut e

xcep

t, as

an

inte

llect

ual e

xerc

ise

ther

e is

littl

e po

int.

Prov

idin

g th

at t

he

insp

ecto

r is c

onvi

nced

that

the

appa

ratu

s is t

he in

tend

ed a

ppar

atus

th

en h

e ha

s fu

lfille

d hi

s fu

nctio

n. H

e sh

ould

be

enco

urag

ed

to a

sk q

uest

ions

if h

e is

unh

appy

abo

ut t

he a

ppar

atus

or

if th

e ci

rcum

stan

ces

of u

se h

ave

chan

ged

but

fund

amen

tally

it is

not

re

ason

able

to e

xpec

t a d

etai

led

anal

ysis

of e

very

loop

.It

is u

sual

ly w

orth

cre

atin

g se

para

te d

raw

ings

of

such

thi

ngs

as

inte

rface

cab

inet

s an

d ju

nctio

n bo

xes

so t

hat

they

can

be

read

ily

chec

ked

for a

ny si

gn o

f una

utho

rised

mod

ifica

tion.

Sim

ilarly

pre

parin

g sh

ort l

ists

of fi

eld

equi

pmen

t gro

uped

in a

par

ticul

ar a

rea

with

thei

r

esse

ntia

l poi

nts

of in

spec

tion

can

shor

ten

the

time

requ

ired.

Mos

t mod

ern

(sm

art)

inst

rum

ents

can

be

iden

tified

from

the

safe

ar

ea c

ompu

ter.

It is

rela

tivel

y si

mpl

e fo

r the

com

pute

r to

chec

k th

at

the

field

inst

rum

ent i

s un

chan

ged

and

rais

e a

flag

if it

is c

hang

ed.

This

can

be

done

fre

quen

tly.

The

perio

dic

insp

ectio

n fo

r th

at

appa

ratu

s is

then

redu

ced

to c

heck

ing

for d

eter

iora

tion.

Ther

e is

a s

trong

link

bet

wee

n th

e ne

ed fo

r pe

riodi

c in

spec

tions

fo

r op

erat

iona

l and

saf

ety

reas

ons

and

it is

usu

al to

com

bine

the

requ

irem

ents

. For

exa

mpl

e, th

e sh

ort p

iece

of fi

eld

wiri

ng u

sed

for

the

final

con

nect

ion

to th

e in

stru

men

t is

ofte

n pr

one

to m

echa

nica

l da

mag

e an

d co

nseq

uent

ly i

s us

ually

inc

lude

d in

the

ins

pect

ion

proc

edur

e ev

en th

ough

its

open

or

shor

t-ci

rcui

t fai

lure

wou

ld n

ot

crea

te a

n in

cend

ive

spar

k.Th

e ch

eck

for

mec

hani

cal d

eter

iora

tion

is u

sual

ly a

qui

ck c

heck

fo

r co

rros

ion,

im

pact

dam

age,

effi

cien

cy o

f se

als,

sec

urity

of

mou

ntin

g an

d ad

equa

cy o

f ca

ble

glan

ds.

Som

e ju

dgem

ent

on

the

need

for

rep

air

or r

epla

cem

ent

is r

equi

red,

and

the

nee

d fo

r op

erat

iona

l re

liabi

lity

usua

lly d

eter

min

es t

he n

eces

sary

act

ion.

Ther

e is

how

ever

no

subs

titut

e fo

r a

wel

l-tra

ined

tech

nici

an w

ith

the

right

atti

tude

.

3.4

Test

ing

of a

ppar

atus

Som

etim

es i

t is

sug

gest

ed t

hat

appa

ratu

s sh

ould

be

rem

oved

fo

r pe

riodi

c te

stin

g. I

n pr

actic

e, i

f an

int

rinsi

cally

saf

e lo

op i

s fu

nctio

nal t

hen

it is

ver

y un

likel

y to

hav

e fa

iled

in a

dan

gero

us

mod

e. C

ompo

nent

s cr

itica

l to

safe

ty a

re d

erat

ed, s

o th

e pr

obab

ility

of

ext

erna

l circ

umst

ance

s ca

usin

g th

em to

fail

with

out c

ausi

ng a

m

alfu

nctio

n is

sm

all.

Ther

e is

a b

igge

r ris

k th

at a

mis

take

cou

ld b

e m

ade

durin

g th

e re

mov

al a

nd r

epla

cem

ent

of t

he a

ppar

atus

bei

ng t

este

d. T

he

argu

men

t for

not

inte

rferin

g w

ith a

sys

tem

, whi

ch h

as s

urvi

ved

the

initi

al in

spec

tion

and

is s

till f

unct

iona

l, is

ver

y po

wer

ful.

A pa

rticu

lar c

ase

som

etim

es c

ited

is re

gard

ing

shun

t-di

ode

safe

ty

barr

iers

. Fai

lure

rat

e st

atis

tics

can

alw

ays

be q

uest

ione

d, b

ut th

e un

dete

cted

failu

re ra

te to

dan

ger o

f a b

arrie

r (i.e

. the

shu

nt d

iode

s no

t fai

ling

to a

n op

en ci

rcui

t con

ditio

n), c

an b

e re

adily

dem

onst

rate

d to

be

in b

ette

r th

an 1

0-10 /a

nnum

. With

thi

s pr

obab

ility

of

failu

re

they

sho

uld

rem

ain

unto

uche

d fo

reve

r. If

they

are

rem

oved

for a

ny

othe

r rea

son

a si

mpl

e co

ntin

uity

che

ck h

as s

ome

mer

it.If

a m

alfu

nctio

n do

es o

ccur

, the

re is

a ri

sk th

at s

afet

y co

mpo

nent

s co

uld

also

hav

e be

en d

amag

ed a

nd p

ower

to th

e sy

stem

sho

uld

be

rem

oved

as

a pr

ecau

tion.

A re

pair

shou

ld b

e ca

rried

out

as

quic

kly

as p

ossi

ble.

App

arat

us o

r w

iring

whi

ch re

mai

ns d

amag

ed o

r is

not i

n us

e fo

r a c

onsi

dera

ble

time,

sho

uld

be re

mov

ed fr

om th

e ha

zard

ous

area

as

it re

pres

ents

an

unn

eces

sary

risk

.

3.5

Test

ing

of e

arth

con

nect

ions

It is

alw

ays

diffi

cult

to b

alan

ce th

e tra

ditio

nal m

etho

ds o

f tes

ting

earth

con

nect

ions

with

the

need

to e

nsur

e th

at a

n un

acce

ptab

le

risk

to th

e pl

ant i

s no

t int

rodu

ced.

Inje

ctin

g si

gnifi

cant

vol

tage

s an

d cu

rren

ts in

to il

l-defi

ned

circ

uits

is n

ot c

ompa

tible

with

avo

idin

g un

nece

ssar

y ris

ks.

In a

lmos

t all

intri

nsic

ally

saf

e in

stal

latio

ns c

able

scr

eens

con

tribu

te

to s

yste

m s

afet

y an

d ne

ed to

be

earth

ed. I

n so

me

appa

ratu

s su

ch

as s

hunt

dio

de s

afet

y ba

rrie

rs a

nd a

ppar

atus

usi

ng a

par

ticul

ar

type

of t

rans

form

er, t

he e

arth

con

nect

ion

is a

n im

porta

nt p

art o

f th

e m

etho

d of

pro

tect

ion.

Whe

re s

urge

pro

tect

ion

agai

nst

indu

ced

volta

ges

(usu

ally

fro

m

light

ning

) is

intro

duce

d th

en th

is in

trodu

ces

a fu

rther

com

plic

atio

n.Th

e de

sign

of

the

earth

ing

syst

em n

eeds

to

be d

one

with

som

e ca

re a

nd p

rovi

sion

mad

e to

ena

ble

the

syst

em to

be

test

ed s

afel

y.

This

is fr

eque

ntly

don

e by

pro

vidi

ng d

uplic

ate

lead

s. T

he s

ubje

ct is

co

nsid

ered

in d

etai

l in

the

sect

ion

on e

arth

ing

and

it is

not

pos

sibl

e to

ade

quat

ely

sum

mar

ise

the

proc

ess.

If yo

u be

lieve

in t

estin

g ea

rths

by in

ject

ing

a si

gnifi

cant

cur

rent

th

en th

ink

very

har

d ab

out t

he p

ossi

ble

path

s th

at th

e cu

rren

t will

us

e to

com

e ba

ck to

its

poin

t of o

rigin

. If y

ou a

re c

onfid

ent t

hat t

he

path

is w

ell d

efine

d an

d sa

fe -

then

ther

e is

no

poin

t in

test

ing

it!

3.6

Test

ing

insu

latio

nIn

sula

tion

test

ing

is u

sual

ly c

arrie

d ou

t usi

ng a

hig

h vo

ltage

(500

V or

mor

e), w

hich

is n

ot c

ompa

tible

with

the

intri

nsic

saf

ety

conc

ept.

(The

igni

tion

capa

ble

capa

cita

nce

corr

espo

ndin

g to

500

V rm

s in

IIC

is 1

60pF

. Thi

s is

the

capa

cita

nce

of a

ppro

xim

atel

y 1m

of c

able

).W

here

ins

ulat

ion

test

ing

is c

onsi

dere

d es

sent

ial,

it sh

ould

be

carr

ied

out

usin

g a

suita

bly

certi

fied

inst

rum

ent.

This

inst

rum

ent

will

app

ly a

low

vol

tage

onl

y (le

ss th

an 6

V) a

nd h

ave

a lo

w c

urre

nt

capa

bilit

y (le

ss th

an 1

0mA)

. How

ever

, bea

r in

min

d th

at it

is d

ifficu

lt to

ens

ure

that

the

re is

no

flam

mab

le g

as a

t al

l poi

nts

alon

g an

in

stru

men

t circ

uit d

urin

g th

e pe

riod

of te

st.

If hi

gh v

olta

ges

are

appl

ied,

car

e sh

ould

be

take

n to

ens

ure

that

th

e co

nnec

ted

equi

pmen

t can

not

be

dam

aged

by

the

test

ing.

For

ex

ampl

e, it

may

be

nece

ssar

y to

dis

conn

ect a

ny s

urge

sup

pres

sion

de

vice

s th

at a

re c

onne

cted

in th

e ci

rcui

t. It

will

als

o be

nec

essa

ry

to ta

ke c

are

to d

isch

arge

any

cha

rge

that

may

hav

e ac

cum

ulat

ed

in th

e eq

uipm

ent d

urin

g te

stin

g.In

trins

ical

ly s

afe

circ

uits

are

usu

ally

fully

floa

ting

or e

arth

ed a

t one

po

int.

The

reas

on fo

r thi

s is

that

if a

circ

uit i

s ea

rthed

at m

ore

than

on

e po

int,

the

diffe

rent

ial p

oten

tial b

etw

een

the

two

poin

ts w

ill c

ause

an

und

efine

d cu

rrent

to fl

ow th

roug

h an

unk

now

n in

duct

ance

.On

a w

ell-b

onde

d pl

ant

the

volta

ges

are

low

and

the

res

ulta

nt

curr

ent m

ay n

ot b

e in

cend

ive,

but

it is

stil

l unk

now

n, c

ould

pos

sibl

y be

ince

ndiv

e an

d is

ther

efor

e no

t des

irabl

e. M

any

intri

nsic

ally

saf

e ci

rcui

ts th

at u

se s

hunt

-dio

de s

afet

y ba

rrie

rs a

re d

esig

ned

to ‘f

ail-

safe

’ in

the

pres

ence

of a

n ea

rth fa

ult,

and

cons

eque

ntly

ther

e is

no

nee

d to

test

the

insu

latio

n.So

me

circ

uits

, bu

t no

t m

any,

are

pro

vide

d w

ith e

arth

lea

kage

de

tect

ion

syst

ems

and

thes

e do

not

nee

d te

stin

g. F

ully

isol

ated

ci

rcui

ts w

ould

req

uire

tw

o se

para

te f

aults

to

earth

poi

nts

som

e di

stan

ce a

part

befo

re th

e ci

rcui

t cou

ld p

ossi

bly

be d

ange

rous

.Th

e pr

obab

ility

is

that

tw

o su

ch f

aults

wou

ld a

lso

crea

te a

n op

erat

iona

l fai

lure

and

con

sequ

ently

rou

tine

insu

latio

n te

stin

g of

th

ese

circ

uits

is n

ot c

onsi

dere

d ne

cess

ary.

Ther

e ar

e a

few

rem

aini

ng c

ircui

ts t

hat

are

not

cove

red

by t

he

abov

e, b

ut th

e le

vel o

f vol

tage

and

cur

rent

nec

essa

ry to

cau

se a

n ea

rth fa

ult t

o be

ince

ndiv

e (a

rgua

bly

grea

ter t

han

9V a

nd 1

00m

A)

wou

ld a

lmos

t alw

ays

caus

es a

n op

erat

iona

l fai

lure

. Con

sequ

ently

, ro

utin

e in

sula

tion

test

ing

of a

func

tioni

ng c

ircui

t on

a w

ell-b

onde

d pl

ant i

s no

t nec

essa

ry o

r des

irabl

e.Th

e ov

eral

l co

nclu

sion

is

th

at

rout

ine

insu

latio

n te

stin

g of

in

trins

ical

ly s

afe

circ

uits

, whi

ch a

re fu

nctio

nal,

is n

ot n

eces

sary

.Th

e em

phas

is o

n ‘fu

nctio

ning

circ

uits

’ doe

s ho

wev

er r

einf

orce

th

e ar

gum

ent

for

rapi

d re

pair

of

non-

func

tiona

l ci

rcui

ts

disc

usse

d el

sew

here

.Th

eore

tical

ly, j

ust r

emov

ing

the

pow

er fr

om a

circ

uit w

ith m

ultip

le

earth

con

nect

ions

doe

s no

t mak

e it

safe

if s

igni

fican

t diff

eren

ces

in

plan

t pot

entia

l exi

st. I

f ins

ulat

ion

test

ing

is th

ough

t to

be d

esira

ble

for o

ther

reas

ons

it sh

ould

be

carr

ied

out w

ith c

are

usin

g a

suita

bly

appr

oved

test

er. W

here

app

arat

us h

as to

be

disc

onne

cted

dur

ing

the

test

ing

proc

ess

then

spe

cial

car

e is

requ

ired

to e

nsur

e th

at th

e re

conn

ectio

n is

cor

rect

, sin

ce th

is is

an

obvi

ous

risk.

Thi

s us

ually

in

volv

es a

t lea

st a

func

tiona

l che

ck.

3.7

Refe

renc

e to

app

arat

us c

ertifi

cate

sOc

casi

onal

ly it

will

be

thou

ght d

esira

ble

to re

fer t

o th

e ce

rtific

ate

of a

pie

ce o

f ap

para

tus.

Som

etim

es a

cop

y is

ava

ilabl

e bu

t th

e pr

efer

red

tech

niqu

e is

to c

heck

on

the

web

for t

he la

test

ver

sion

. M

ost m

anuf

actu

rers

and

som

e ce

rtific

atio

n au

thor

ities

mak

e th

eir

certi

ficat

es a

vaila

ble

by th

is m

eans

. For

exa

mpl

e, M

TL c

ertifi

cate

s ar

e av

aila

ble

on th

e w

eb-s

ite h

ttp

://w

ww

.mtl

-in

st.c

om

/su

pp

ort

an

d IE

C E

x ce

rtif

icat

es a

re a

vaila

ble

on t

he w

eb-s

ite

htt

p:/

/ww

w.i

ec

ex

.co

m T

he u

se o

f the

web

ens

ures

that

th

e m

ost

rece

nt v

ersi

on o

f th

e ce

rtif

icat

e is

ava

ilabl

e an

d th

at t

he c

erti

fica

te i

s co

mpl

ete.

MTL7700 S

eri

es

DIN-

rail

mou

nted

saf

ety

barr

iers

.

89

The

com

patib

ility

of t

wo

piec

es o

f app

arat

us s

houl

d be

est

ablis

hed

by c

ompa

ring

the

data

of e

ach

appa

ratu

s. T

he s

eque

nce

is u

sual

ly

as fo

llow

s.

a)

Com

pare

the

lev

els

of p

rote

ctio

n. I

f th

ey d

iffer

the

n th

e sy

stem

take

s th

e le

ast s

ensi

tive

leve

l. Fo

r exa

mpl

e if

one

devi

ce

is ‘i

a’ a

nd th

e ot

her ‘

ib’ t

hen

the

syst

em b

ecom

es ‘i

b’.

A so

urce

of p

ower

that

is c

ertifi

ed ‘i

b’ w

ill h

ave

perm

itted

out

put

para

met

ers

for

use

in ‘

ic’

circ

uits

. If

thes

e hi

gher

val

ues

are

used

in th

e sy

stem

des

ign

then

the

syst

em b

ecom

es ‘i

c’.

b)

Com

pare

gas

cla

ssifi

catio

ns. I

f th

ey d

iffer

the

n th

e sy

stem

ta

kes

the

leas

t sen

sitiv

e cl

assi

ficat

ion.

For

exa

mpl

e if

one

devi

ce

is II

C an

d th

e ot

her I

IB th

en th

e sy

stem

bec

omes

IIB.

It is

usu

al f

or a

sou

rce

of p

ower

cer

tified

as

IIC t

o ha

ve

perm

issi

ble

outp

ut p

aram

eter

s (L

o, C

o an

d Lo

/Ro)

for I

IB a

nd II

A ga

s gr

oups

. If t

hese

larg

er v

alue

s ar

e us

ed th

en th

e pa

ram

eter

s us

ed d

eter

min

e th

e sy

stem

gas

gro

up.

c) D

eter

min

e th

e te

mpe

ratu

re c

lass

ifica

tion

of th

e fie

ld m

ount

ed

equi

pmen

t. Ap

para

tus

may

ha

ve

diffe

rent

te

mpe

ratu

re

clas

sific

atio

ns f

or d

iffer

ent

cond

ition

s of

use

(us

ually

am

bien

t te

mpe

ratu

re) a

nd th

e re

leva

nt o

ne sh

ould

be

sele

cted

and

reco

rded

. It

shou

ld b

e no

ted

that

it is

the

appa

ratu

s th

at g

ets

tem

pera

ture

cla

ssifi

ed n

ot th

e sy

stem

.

d)

The

perm

issib

le a

mbi

ent t

empe

ratu

re r

ange

of e

ach

piec

e of

ap

para

tus

shou

ld b

e re

cord

ed.

e)

The

volta

ge

(Uo)

, cu

rren

t (Io

) an

d po

wer

(P

o)

outp

ut

para

met

ers

of th

e so

urce

of p

ower

sho

uld

be c

ompa

red

with

the

inpu

t par

amet

ers

(Ui,

Ii an

d Pi

) of t

he fi

eld

devi

ce a

nd th

e ou

tput

para

met

ers

shou

ld n

ot e

xcee

d th

e re

leva

nt in

put

para

met

ers.

Oc

casi

onal

ly

the

safe

ty

of

the

field

de

vice

is

co

mpl

etel

y sp

ecifi

ed b

y on

ly o

ne o

f the

se p

aram

eter

s (u

sual

ly U

i). In

thes

e ci

rcum

stan

ces

the

unsp

ecifi

ed p

aram

eter

s ar

e no

t rel

evan

t.

f) D

eter

min

e th

e pe

rmitt

ed c

able

par

amet

ers.

The

perm

itted

cab

le c

apac

itanc

e (C

c) is

der

ived

by

subt

ract

ing

the

inpu

t cap

acita

nce

of th

e fie

ld d

evic

e (C

i) fro

m th

e pe

rmitt

ed

outp

ut c

apac

itanc

e of

the

sou

rce

of p

ower

(Co

), th

at is

Cc

=

Co –

Ci.

The

perm

itted

cab

le i

nduc

tanc

e (L

c) i

s de

rived

by

subt

ract

ing

the

inpu

t ind

ucta

nce

of th

e fie

ld d

evic

e (L

i) fro

m th

e pe

rmitt

ed o

utpu

t ind

ucta

nce

of th

e so

urce

of p

ower

(Lo)

, tha

t is

Lc =

Lo

– Li

.De

term

inin

g th

e pe

rmitt

ed L

/R ra

tio o

f the

cab

le (L

c/Rc

) is

very

ea

sy if

the

inpu

t ind

ucta

nce

of th

e fie

ld d

evic

e is

neg

ligib

le, i

.e.

if Li

less

than

1%

of L

o. In

this

cas

e, L

c/Rc

is c

onsi

dere

d eq

ual

to L

o/Ro

. How

ever

, if t

he in

duct

ance

of t

he fi

eld

devi

ce is

mor

e si

gnifi

cant

then

the

equa

tion

incl

uded

in IE

C 60

072-

26 c

an b

e us

ed to

cal

cula

te th

e pe

rmitt

ed L

c /R

c. F

ortu

nate

ly th

is is

not

a

frequ

ently

occ

urrin

g re

quire

men

t.Re

cent

ly th

ere

has b

een

incr

easi

ng co

ncer

n ab

out t

he in

tera

ctio

n of

sys

tem

ind

ucta

nce

and

capa

cita

nce

incr

easi

ng t

he r

isk

of

igni

tion

capa

ble

spar

ks.

Fig

ure

4.1

- S

impl

e sy

stem

of i

nter

face

and

tran

smitt

er

4.1

Gene

ral

Whe

re in

trins

ical

ly s

afe

appa

ratu

s is

inte

rcon

nect

ed b

y w

iring

, the

sa

fety

of e

ach

piec

e of

app

arat

us is

affe

cted

by

the

perfo

rman

ce

of th

e ot

her p

iece

s of

app

arat

us in

the

circ

uit.

The

safe

ty te

chni

que

relie

s on

the

syst

em b

eing

cor

rect

ly d

esig

ned

and

intri

nsic

saf

ety

beco

mes

a s

yste

m c

once

pt.

Othe

r m

etho

ds o

f pr

otec

tion

are

also

dep

ende

nt o

n th

e sy

stem

con

cept

to s

ome

exte

nt, b

ut it

is a

fu

ndam

enta

l req

uire

men

t of i

ntrin

sic

safe

ty.

For

exam

ple

flam

epro

of e

quip

men

t is

only

ade

quat

ely

safe

whe

n pr

ovid

ed w

ith t

he c

orre

ct e

lect

rical

pro

tect

ion

and

a m

eans

of

isol

atio

n, b

ut th

is is

not

gen

eral

ly re

gard

ed a

s be

ing

as s

igni

fican

t as

ens

urin

g th

at th

e ap

para

tus

with

in a

n in

trins

ical

ly s

afe

syst

em is

co

mpa

tible

. The

re a

re s

ome

piec

es o

f int

rinsi

cally

saf

e ap

para

tus,

us

ually

por

tabl

e eq

uipm

ent,

that

are

use

d in

isol

atio

n, fo

r exa

mpl

e to

rche

s an

d ra

dios

. Th

e fo

llow

ing

anal

ysis

of

intri

nsic

ally

saf

e sy

stem

s do

es n

ot a

pply

to th

ese

type

s of

app

arat

us.

In

addi

tion,

so

me

Fiel

dbus

sy

stem

s ar

e co

nstru

cted

to

th

e FI

SCO/

FNIC

O st

anda

rd I

EC 6

0079

-27,

whi

ch i

ntro

duce

s so

me

sim

plifi

catio

n of

th

e sy

stem

ru

les.

Th

ese

requ

irem

ents

ar

e di

scus

sed

in

MTL

ap

plic

atio

n no

te A

N902

6 bu

t no

t in

th

is

docu

men

t. Th

is d

ocum

ent

conc

entra

tes

on p

oint

-to-

poin

t w

ired

syst

ems,

whi

ch a

re th

e pr

edom

inan

t for

m o

f ins

trum

enta

tion.

The

rele

vant

IE

C sy

stem

st

anda

rd

is

IEC

6007

9-25

, w

hich

in

tera

cts

with

the

IEC

code

of

prac

tice

IEC

6007

9-14

to

prov

ide

com

preh

ensi

ve c

over

age

of th

e su

bjec

t.Th

e sy

stem

des

igne

r mus

t acc

ept r

espo

nsib

ility

for t

he a

dequ

acy

of th

e de

sign

and

the

safe

ty im

plic

atio

ns o

f the

use

of t

he s

yste

m

in a

ssoc

iatio

n w

ith h

azar

dous

are

as.

The

desi

gner

mus

t ha

ve

an a

ppro

pria

te le

vel o

f kn

owle

dge

and

train

ing

and

the

anal

ysis

sh

ould

not

be

done

with

out r

ecog

nisi

ng th

e im

porta

nce

of g

ettin

g it

right

. The

ana

lysi

s of

sim

ple

syst

ems

is re

lativ

ely

easy

and

can

be

don

e by

any

com

pete

nt p

rofe

ssio

nal e

ngin

eer.

How

ever

som

e of

the

mor

e co

mpl

ex s

yste

ms

such

as

thos

e us

ing

a co

mbi

natio

n of

non

-lin

ear

and

linea

r so

urce

s of

pow

er

requ

ire a

gre

ater

deg

ree

of e

xper

ienc

e an

d it

may

be

desi

rabl

e to

app

roac

h an

‘ap

prov

ed c

ertif

icat

ion

body

’ to

pro

vide

an

anal

ysis

for s

uch

a sy

stem

.

4.2

Com

plia

nce

with

ATE

X Di

rect

ives

and

DSE

ARUn

less

they

are

con

side

red

to b

e ‘s

impl

e ap

para

tus’

(see

sec

tion

4.4)

, ind

ivid

ual p

iece

s of

equ

ipm

ent a

re r

equi

red

to c

ompl

y w

ith

the

ATEX

equ

ipm

ent

dire

ctiv

e (9

4/9/

EC).

How

ever

, th

e m

ajor

ity

of i

ntrin

sica

lly s

afe

syst

ems

com

bine

equ

ipm

ent

from

one

or

mor

e su

pplie

rs a

nd t

hese

sys

tem

s be

com

e an

‘ins

talla

tion’

and

do

not

nee

d to

be

certi

fied

to t

he e

quip

men

t di

rect

ive.

The

re

mig

ht, h

owev

er, b

e ra

re o

ccas

ions

whe

n a

man

ufac

ture

r pl

aces

a

com

plet

e sy

stem

on

the

mar

ket,

in w

hich

cas

e th

e sy

stem

will

ha

ve to

com

ply

with

the

equi

pmen

t dire

ctiv

e.Th

e in

stal

latio

ns

dire

ctiv

e (1

999/

92/E

C),

and

the

DSEA

R re

gula

tions

, req

uire

a ri

sk a

naly

sis

(with

in th

eir j

uris

dict

ion)

of a

ny

inst

alla

tion

that

con

tain

s on

e or

mor

e ha

zard

ous

area

s an

d th

e sy

stem

doc

umen

tatio

n be

com

es a

n es

sent

ial p

art o

f tha

t ana

lysi

s.

In a

lmos

t al

l oth

er p

arts

of

the

wor

ld s

imila

r re

quire

men

ts e

xist

ei

ther

for l

egal

or i

nsur

ance

reas

ons.

Whe

re n

o su

ch re

quire

men

ts

exis

t the

re is

stil

l the

fund

amen

tal r

equi

rem

ent t

o op

erat

e sa

fely

an

d to

be

able

to d

emon

stra

te th

at a

ll re

ason

able

pre

caut

ions

hav

e be

en ta

ken.

For

thes

e re

ason

s th

e pr

epar

atio

n of

ade

quat

e sy

stem

Desi

gn o

f int

rinsi

cally

saf

e sy

stem

s

docu

men

tatio

n is

an

esse

ntia

l par

t of t

he d

esig

n of

an

intri

nsic

ally

sa

fe in

stal

latio

n.Th

e pr

epar

atio

n of

doc

umen

tatio

n fo

r a n

ew in

stal

latio

n, to

sat

isfy

th

e in

stal

latio

ns d

irect

ive

and

DSEA

R, is

usu

ally

rel

ativ

ely

sim

ple

as a

ll th

e eq

uipm

ent w

ill c

ompl

y w

ith th

e ap

para

tus

dire

ctiv

e or

be

sim

ple

appa

ratu

s an

d th

e ne

cess

ary

data

will

be

read

ily a

vaila

ble.

A

slig

htly

mor

e co

mpl

ex s

ituat

ion

aris

es w

hen

it is

tho

ught

de

sira

ble

to in

corp

orat

e ex

istin

g eq

uipm

ent,

whi

ch is

not

cer

tified

to

the

appa

ratu

s di

rect

ive.

For

exam

ple,

suc

h a

situ

atio

n ar

ises

if it

bec

omes

nec

essa

ry t

o re

plac

e a

cent

ral p

roce

ssor

and

its

rela

ted

inte

rface

s bu

t no

t to

re

plac

e th

e fie

ld d

evic

es.

In t

hese

circ

umst

ance

s, p

rovi

ded

the

field

dev

ices

are

con

side

red

to h

ave

an a

dequ

ate

leve

l of

safe

ty

and

thei

r do

cum

enta

tion

cont

ains

the

nec

essa

ry i

nfor

mat

ion

to

enab

le a

sys

tem

doc

umen

t to

be p

repa

red,

an

acce

ptab

le s

yste

m

docu

men

t can

be

crea

ted.

To b

e co

nsid

ered

as

“ade

quat

ely

safe

”, o

lder

equ

ipm

ent

mus

t ac

hiev

e a

leve

l of s

afet

y of

the

sam

e or

der a

s eq

uipm

ent t

hat h

asre

cent

ly a

cqui

red

docu

men

ts o

f con

form

ity to

the

ATEX

app

arat

us

dire

ctiv

e. I

n th

e pa

rticu

lar

case

of

intri

nsic

ally

saf

e eq

uipm

ent

ther

e ha

s be

en n

o fu

ndam

enta

l cha

nge

in t

he s

tand

ards

, whi

ch

has

thro

wn

into

dou

bt t

he s

afet

y of

equ

ipm

ent

conf

orm

ing

to

any

of th

e CE

NELE

C ba

sed

stan

dard

s. A

rgua

bly,

eve

n eq

uipm

ent

conf

orm

ing

to t

he o

lder

SFA

301

2 an

d SF

A 30

04 s

tand

ards

tha

t w

ere

used

in th

e UK

is p

roba

bly

adeq

uate

ly s

afe.

NOTE

: The

re is

a p

robl

em re

gard

ing

equi

pmen

t spa

res

that

do

not

have

doc

umen

ts o

f con

form

ity to

the

ATEX

app

arat

us d

irect

ive,

as

they

can

no

long

er b

e su

pplie

d by

the

orig

inal

man

ufac

ture

r for

use

in

ass

ocia

tion

with

haz

ardo

us a

reas

. Onl

y ap

para

tus

alre

ady

in th

e po

sses

sion

of t

he e

nd-u

ser o

r ‘in

the

supp

ly c

hain

’ can

be

utili

sed.

It

seem

s pr

uden

t th

eref

ore

to t

ake

this

pot

entia

l di

fficu

lty i

nto

acco

unt w

hen

cons

ider

ing

the

cont

inue

d us

e of

old

er e

quip

men

t.

4.3

Sim

ple

syst

ems

The

maj

ority

of

intri

nsic

ally

saf

e sy

stem

s ar

e si

mpl

e sy

stem

s th

at c

onta

in a

sin

gle

sour

ce o

f po

wer

in

asso

ciat

ed a

ppar

atus

co

nnec

ted

to a

sin

gle

piec

e of

intri

nsic

ally

saf

e ap

para

tus

out i

n th

e fie

ld. S

uch

a sy

stem

is d

iscu

ssed

in d

etai

l in

an a

ppen

dix

of

IEC

6007

9-11

.He

re, w

e us

e th

e co

mbi

natio

n of

a te

mpe

ratu

re tr

ansm

itter

and

an

intri

nsic

ally

saf

e in

terfa

ce, s

how

n in

Fig

ure

4.1,

to

illus

trate

th

e te

chni

que.

The

first

ste

p is

to

obta

in t

he s

afet

y da

ta o

f th

e tw

o pi

eces

of

appa

ratu

s in

the

circ

uit.

This

dat

a is

bes

t der

ived

from

a c

opy

of

the

certi

ficat

e, w

hich

sho

uld

be a

vaila

ble

to th

e sy

stem

des

igne

r. In

par

ticul

ar, a

ny s

peci

al c

ondi

tions

of

use

shou

ld b

e ta

ken

into

ac

coun

t in

the

sys

tem

des

ign.

The

inf

orm

atio

n pl

aced

on

the

syst

em d

raw

ing

shou

ld b

e th

e re

sult

of a

cle

arly

just

ifiab

le a

naly

sis

mak

ing

it re

lativ

ely

sim

ple

to c

reat

e th

e in

stal

latio

n dr

awin

g fro

m

this

refe

renc

e dr

awin

g.N

OTE

:

Copi

es o

f MTL

Cer

tifica

tes

are

avai

labl

e fro

m w

eb s

ite:

htt

p:/

/ww

w.m

tl-i

nst

.com

/su

pp

ort

Copi

es o

f IEC

Ex

Certi

ficat

es a

re a

vaila

ble

from

web

site

:h

ttp

://w

ww

.iecex.c

om

4.

- C

lass

ifica

tion

ia

IIC

- C

ab

le p

ara

mete

rs 8

0 n

F, 3

.0 m

H, 5

5 μ

H/Ω

iso

late

d

Tem

pera

ture

Tra

nsm

itte

r

Typ

e: 365S

(exa

mp

le)

Pan

Inc.

, Bos

ton,

USA

Ex ia

IIC

T4 b

y FU

ML

No. 9

8306

5T a

mb

= –

40°C

to +

80°C

‘B’

Term

ina

ls

Ui: 3

0 V

Ii: 1

20 m

APi

: 1 W

Ci: 3

nF

Li: 1

0 m

H

No

tes:

a) I

f cab

le ‘y

’ bec

omes

par

t of a

mul

ticor

e, th

en th

is m

ultic

ore

cabl

e m

ust b

e a

Ty

pe ‘A

’ or ‘

B’, a

s sp

ecifi

ed in

IEC

6007

9-14

.b

) Cab

le ‘y

’ has

cap

aciti

ve li

mita

tion

80 n

F in

IIC;

647

nF

in II

B

Typ

e M

TL5541 -

da

ta

MTL L

td, L

uto

n, U

K

[EEx

ia] I

IC b

y EE

CSNo

. BAS

eefa

07AT

EX01

0123

T am

b =

–20

°C to

+60

°C

Sa

fety

Pa

ram

ete

rs

Um: 2

50 V

Uo: 2

8VIo

: 93m

APo

: 651

mW

IIC

Pa

ram

ete

rs

Co: 8

3nF

Lo: 4

.2m

HLo

/Ro:

56μ

H/Ω

“The

saf

ety

tech

niqu

e re

lies

on th

e sy

stem

bei

ng c

orre

ctly

des

igne

d an

d

intri

nsic

saf

ety

beco

mes

a s

yste

m c

once

pt”

1011

4.3

Sim

ple

syst

ems

- co

ntin

ued

This

con

cern

is c

onfin

ed t

o fix

ed in

duct

ance

and

cap

acita

nce

and

not t

o th

e di

strib

uted

par

amet

ers

of a

cab

le. C

onse

quen

tly

on t

hose

rar

e oc

casi

ons

whe

n BO

TH t

he l

umpe

d in

duct

ance

(th

e su

m o

f Li o

f the

sou

rce

of p

ower

and

the

field

dev

ice)

and

th

e lu

mpe

d ca

paci

tanc

e (th

e su

m o

f Ci o

f the

sou

rce

of p

ower

an

d th

e fie

ld d

evic

e) a

re g

reat

er t

han

1% o

f th

e re

spec

tive

outp

ut p

aram

eter

s of

the

sour

ce o

f pow

er L

o an

d Co

then

the

perm

issi

ble

outp

ut p

aram

eter

s ar

e bo

th to

be

divi

ded

by tw

o.It

shou

ld b

e st

ress

ed t

hat

this

red

uctio

n in

out

put

para

met

ers

is o

nly

appl

icab

le o

n ve

ry r

are

occa

sion

s si

nce

it is

unu

sual

fo

r fie

ld d

evic

es t

o ha

ve B

OTH

indu

ctiv

e an

d ca

paci

tive

inpu

t pa

ram

eter

s w

hich

are

sig

nific

antly

larg

e.Fr

eque

ntly

the

Li a

nd C

i of

a so

urce

of

pow

er a

re n

ot q

uote

d in

the

doc

umen

tatio

n an

d in

the

se c

ircum

stan

ces

it ca

n be

as

sum

ed t

hat

they

are

neg

ligib

le. T

here

is n

o su

gges

tion

that

it

is c

onsi

dere

d ne

cess

ary

to g

o ba

ck a

nd c

heck

the

saf

ety

docu

men

tatio

n on

exi

stin

g in

stal

latio

ns f

or t

his

mos

t re

cent

re

quire

men

t. Ho

wev

er n

ew a

naly

ses

shou

ld t

ake

this

rem

ote

poss

ibili

ty in

to a

ccou

nt.

To s

umm

aris

e, c

heck

tha

t ei

ther

the

lum

ped

capa

cita

nce

or

indu

ctan

ce is

less

than

1%

of t

he re

spec

tive

outp

ut p

aram

eter

s.

If it

is, t

hen

the

orig

inal

cal

cula

tion

is v

alid

. If B

OTH

para

met

ers

are

grea

ter

than

1%

of

the

outp

ut p

aram

eter

s th

en C

o an

d Lo

of t

he s

yste

m s

houl

d be

red

uced

by

a fa

ctor

of t

wo.

If th

is

redu

ctio

n se

ems

to b

e ne

cess

ary

then

go

back

and

che

ck th

e in

form

atio

n us

ed, a

s th

is is

an

unus

ual s

ituat

ion.

Whe

re a

sou

rce

of p

ower

is c

ertifi

ed ‘i

a’ o

r ’ib

’, th

e pe

rmitt

ed

outp

ut p

aram

eter

s Lo

, Co

and

Lo/

Ro a

re d

eriv

ed u

sing

a

fact

or o

f sa

fety

of

1,5.

Whe

n su

ch a

sou

rce

of p

ower

is u

sed

in a

n ‘ic

’ circ

uit t

hen

the

perm

itted

out

put p

aram

eter

s m

ay b

e de

rived

usi

ng a

uni

ty s

afet

y fa

ctor

. Thi

s re

sults

in a

sig

nific

ant

chan

ge, w

hich

usu

ally

rem

oves

the

nece

ssity

to c

onsi

der c

able

pa

ram

eter

s in

det

ail.

Accu

rate

val

ues

can

be a

scer

tain

ed u

sing

th

e m

etho

ds a

nd ta

bles

in th

e ap

para

tus s

tand

ard.

An

acce

ptab

le

cons

erva

tive

tech

niqu

e is

to m

ultip

ly th

e Lo

and

Lo/

Ro b

y tw

o an

d th

e Co

by

thre

e, w

hich

nor

mal

ly re

mov

es a

ny c

once

rn a

bout

ca

ble

para

met

ers.

g)

Chec

k th

at th

e le

vel o

f ins

ulat

ion

from

ear

th is

acc

epta

ble,

or

that

the

syst

em e

arth

ing

requ

irem

ents

are

sat

isfie

d.

If th

ese

crite

ria a

re a

ll sa

tisfie

d th

e co

mpa

tibili

ty o

f th

e tw

o pi

eces

of

appa

ratu

s w

ill h

ave

been

est

ablis

hed.

A c

onve

nien

t w

ay o

f rec

ordi

ng th

e an

alys

is is

to c

reat

e a

tabl

e. Ta

ble

4.1

is a

n ex

ampl

e th

at u

ses

valu

es fr

om th

e ty

pica

l sys

tem

dra

win

g (s

ee

Figu

re 4

.1) a

nd c

ompa

res

the

intri

nsic

ally

saf

e in

terfa

ce a

nd th

e te

mpe

ratu

re tr

ansm

itter

.

4.4

The

use

of s

impl

e ap

para

tus

in s

yste

ms

The

appa

ratu

s st

anda

rd (

IEC

6007

9-11

) di

stin

guis

hes

betw

een

com

plex

ap

para

tus,

w

hich

no

rmal

ly

requ

ires

som

e fo

rm

of

certi

ficat

ion

and

‘sim

ple

appa

ratu

s’ w

hich

is n

ot r

equi

red

to b

e ce

rtifie

d. T

his

dist

inct

ion

is in

tend

ed to

per

mit

the

use

of a

ppar

atus

th

at d

oes

not s

igni

fican

tly a

ffect

the

intri

nsic

saf

ety

of a

sys

tem

, w

ithou

t the

nee

d fo

r ‘th

ird p

arty

’ cer

tifica

tion.

Ther

e is

an

impl

icat

ion

that

it

is p

ossi

ble

to d

emon

stra

te t

hat

sim

ple

appa

ratu

s is

obv

ious

ly s

afe

with

out r

ecou

rse

to th

e de

tail

appl

icat

ion

of th

e re

mai

nder

of t

he s

tand

ard.

For

exa

mpl

e, if

any

cu

rren

t or

vol

tage

lim

iting

com

pone

nts

are

nece

ssar

y th

en t

he

appa

ratu

s is

not

con

side

red

to b

e si

mpl

e. In

pra

ctic

e it

is re

lativ

ely

easy

to

deci

de w

hich

com

pone

nts

are

sim

ple

appa

ratu

s at

the

sy

stem

des

ign

stag

e. If

the

deci

sion

is n

ot e

asy

then

the

appa

ratu

s is

not

sim

ple.

NO

TE

: Alth

ough

it is

not

con

side

red

esse

ntia

l tha

t sim

ple

appa

ratu

s is

cer

tified

by

a th

ird p

arty

, it i

s no

t unu

sual

for s

impl

e ap

para

tus

that

is u

sed

in s

igni

fican

t qua

ntiti

es to

be

certi

fied.

This

is r

eass

urin

g to

the

end

user

and

is a

sig

nific

ant m

arke

ting

adva

ntag

e. In

the

se c

ircum

stan

ces

the

appa

ratu

s is

mar

ked

as

requ

ired

by th

e ap

para

tus

stan

dard

, but

can

be

used

in th

e sa

me

way

as

othe

r sim

ple

appa

ratu

s.Th

e ap

para

tus

stan

dard

impo

ses

limits

of 1

.5V,

100m

A an

d 25

mW

on

the

valu

es g

ener

ated

by

sim

ple

appa

ratu

s, a

nd it

is a

ccep

ted

that

sim

ple

appa

ratu

s ca

n be

add

ed to

an

intri

nsic

ally

saf

e sy

stem

w

ithou

t the

nee

d to

rec

alcu

late

the

safe

ty o

f the

sys

tem

. It m

ust

be u

nder

stoo

d ho

wev

er, t

hat a

ny li

mita

tions

on

sim

ple

appa

ratu

s ap

ply

to th

e co

mbi

natio

n of

all

the

piec

es o

f sim

ple

appa

ratu

s in

a

syst

em. F

or e

xam

ple,

the

use

of o

ne o

r tw

o th

erm

ocou

ples

in a

sy

stem

is p

erm

itted

but

a c

ombi

natio

n of

a la

rge

num

ber u

sed

in

a si

ngle

, ave

rage

tem

pera

ture

circ

uit m

ight

not

mee

t thi

s cr

iterio

n.

The

stan

dard

als

o al

low

s ca

paci

tive

and

indu

ctiv

e co

mpo

nent

s to

be

used

in s

impl

e ap

para

tus,

pro

vide

d th

at th

ese

com

pone

nts

are

incl

uded

in t

he s

yste

m e

valu

atio

n.

It is

not

usu

al t

o in

clud

e in

duct

ors

or c

apac

itors

of s

igni

fican

t siz

e, b

ut th

e si

mpl

e ap

para

tus

conc

ept

does

pe

rmit

the

use

of

smal

l ra

dio-

frequ

ency

(r.

f.)

deco

uplin

g co

mpo

nent

s w

ithou

t un

derta

king

a f

urth

er a

naly

sis

of t

he s

yste

m. A

use

ful r

ule-

of-t

hum

b is

to

ensu

re t

hat

the

tota

l ca

paci

tanc

e an

d in

duct

ance

add

ed to

the

syst

em is

less

than

1%

of

the

resp

ectiv

e ou

tput

par

amet

ers

of th

e so

urce

of p

ower

, in

whi

ch

case

, the

ir ef

fect

can

be

igno

red.

If B

OTH

the

adde

d ca

paci

tanc

e an

d in

duct

ance

, tog

ethe

r w

ith a

ny o

ther

‘lum

ped’

cap

acita

nce

in

the

circ

uit a

re g

reat

er th

an 1

% o

f the

spe

cifie

d ou

tput

par

amet

ers

of th

e so

urce

of p

ower

then

the

perm

itted

out

put p

aram

eter

s m

ust

be h

alve

d, a

s ex

plai

ned

in S

ectio

n 4.

3. T

his

is a

noth

er v

ery

good

re

ason

for e

nsur

ing

that

the

‘ene

rgy

stor

ing’

com

pone

nts

in s

impl

e ap

para

tus

are

kept

sm

all.

It is

als

o ne

cess

ary

to t

empe

ratu

re c

lass

ify s

impl

e ap

para

tus

whe

n it

is in

tend

ed f

or h

azar

dous

are

a. T

he a

ppar

atus

sta

ndar

d al

low

s a

T6 te

mpe

ratu

re c

lass

ifica

tion

for s

witc

hes,

plu

gs, s

ocke

ts

and

term

inal

s us

ed w

ithin

the

ir no

rmal

rat

ing

at a

n am

bien

t te

mpe

ratu

re o

f not

gre

ater

than

40°

C.In

pra

ctic

e, it

is n

ot e

asy

to d

esig

n a

syst

em t

hat

can

be u

sed

with

gas

es re

quiri

ng a

T6

(85°

C) te

mpe

ratu

re c

lass

ifica

tion

and

a T4

(135

°C) c

lass

ifica

tion

is n

orm

ally

the

leve

l ach

ieve

d. In

real

ity,

the

only

gas

list

ed in

the

avai

labl

e do

cum

enta

tion

requ

iring

a T

6 te

mpe

ratu

re c

lass

ifica

tion

is c

arbo

n di

sulfi

de (

CS2).

For

tuna

tely

, th

e us

e of

thi

s ga

s in

indu

stry

is b

ecom

ing

rare

bec

ause

of

its

toxi

city

. A

T4 t

empe

ratu

re c

lass

ifica

tion

is t

here

fore

ade

quat

e no

rmal

ly a

nd a

cla

im o

f T6

is

pred

omin

antly

a m

arke

ting

ploy

ra

ther

than

a re

quire

men

t.Th

e te

mpe

ratu

re c

lass

ifica

tion

of o

ther

pie

ces

of a

ppar

atus

(with

a

surfa

ce a

rea

not l

ess

than

20m

m2 )

norm

ally

rel

ies

on th

e in

put

pow

er b

eing

no

grea

ter

than

1,3

W w

hen

the

max

imum

am

bien

t te

mpe

ratu

re re

quire

d is

40°

C. T

he c

orre

spon

ding

pow

ers

for h

ighe

r am

bien

t tem

pera

ture

s ar

e 1,

2W a

t 60°

C an

d 1W

at 8

0°C.

If th

is ru

le

is n

ot a

pplic

able

then

the

poss

ible

max

imum

sur

face

tem

pera

ture

ha

s to

be

mea

sure

d or

ass

esse

d. If

for a

ny re

ason

it is

not

obv

ious

th

at th

e m

axim

um s

urfa

ce te

mpe

ratu

re is

con

side

rabl

y lo

wer

than

13

5°C

(say

100

°C) t

hen

the

appa

ratu

s is

pro

babl

y no

t sim

ple.

Sim

ple

appa

ratu

s is

usu

ally

iso

late

d fro

m e

arth

. Ho

wev

er,

the

appa

ratu

s st

anda

rd r

equi

res

a 50

0V i

nsul

atio

n te

st a

nd i

f th

e si

mpl

e ap

para

tus

cann

ot m

eet t

his

then

it in

trodu

ces

an e

arth

on

to th

e sy

stem

and

the

syst

em d

esig

n m

ust t

ake

this

into

acc

ount

.A

typi

cal e

xam

ple o

f sim

ple a

ppar

atus

is th

e res

ista

nce t

herm

omet

er

(RTD

) sho

wn

as th

e se

nsor

in th

e ty

pica

l sys

tem

dra

win

g.Th

e RT

D is

a t

empe

ratu

re s

ensi

tive

resi

stor

. It

has

negl

igib

le

indu

ctan

ce (

less

tha

n 4μ

H) b

ecau

se i

t is

bifi

lar

wou

nd a

nd

negl

igib

le c

apac

itanc

e (le

ss th

an 1

0pF)

. The

mat

ched

pow

er fr

om

the

trans

mitt

er t

erm

inal

s is

2,5

mW

, w

hich

is

cons

ider

ably

les

s th

an th

e 25

mW

con

side

red

negl

igib

le fo

r sim

ple

appa

ratu

s.Th

is lo

w le

vel o

f pow

er e

nsur

es th

at th

e te

mpe

ratu

re c

lass

ifica

tion

of th

e RT

D is

det

erm

ined

by

the

tem

pera

ture

bei

ng m

easu

red.

(A

T6 te

mpe

ratu

re s

enso

r mea

surin

g 45

0°C

is a

com

mon

adv

ertis

ing

phen

omen

on.)

The

RTD

does

not

mee

t the

requ

ired

500V

insu

latio

n te

st a

nd c

onse

quen

tly th

is s

ub-c

icui

t is

cons

ider

ed to

be

earth

ed

at th

is p

oint

. The

inst

alla

tion

is s

atis

fact

ory

beca

use

of th

e is

olat

ion

in th

e te

mpe

ratu

re tr

ansm

itter

.Th

e ig

nitio

n en

ergy

of a

gas

dec

reas

es a

t ele

vate

d te

mpe

ratu

res

and

cons

eque

ntly

the

very

low

faul

t vol

tage

and

pow

er a

vaila

ble

to t

he R

TD i

s a

bene

ficia

l fa

ctor

in

ensu

ring

the

safe

ty o

f an

y m

easu

rem

ent o

f hig

h te

mpe

ratu

res.

Tab

le 4

.1 S

impl

e sy

stem

ana

lysi

s

Seq

uen

ce s

tep

P

ara

mete

r

Inte

rfa

ce

Tem

pera

ture

tra

nsm

itte

r

Sys

tem

a)

Le

vel o

f pro

tect

ion

ia

ia

ia

b)

Gas

grou

p

IIC

IIC

IICc)

Te

mpe

ratu

re c

lass

ifica

tion

T4

d)

Ambi

ent t

empe

ratu

re

- 20

°C to

+60

°C

- 40

°C to

+80

°Ce)

Para

met

er c

ompa

rison

Vo

ltage

Uo

: 28V

Ui

: 30V

Cu

rren

t Io

: 93m

A

Ii: 1

20m

A

Pow

er

Po: 6

50m

W

Pi: 1

Wf)

Ca

ble

para

met

ers

Ca

paci

tanc

e

Co: 8

3nF

Ci

: 3nF

Cc

: 80n

F

Indu

ctan

ce

Lo: 3

.05m

H

Li: 1

0μH

Lc

: 3m

H

L/R

ratio

Lo

/Ro:

55μ

H/Ω

Lc

/Rc:

55μ

H/Ω

g)

Is

olat

ion

is

olat

ed

isol

ated

is

olat

ed

Fig

ure

4.2

- R

TD a

nd tr

ansm

itter

sub

-sys

tem

- Cl

assi

ficat

ion

ia II

C-

Cabl

e pa

ram

eter

s 10

00μF

, 3

50m

H-

Earth

ed a

t RTD

Note

: ‘T’

cla

ss d

eter

min

ed

by m

axim

um m

easu

red

tem

pera

ture

.

RTD

Typ

e: 350L (

exa

mp

le)

Pete

r Pty

, Syd

ney,

Aus

tralia

Sim

ple

Appa

ratu

s to

IEC

6007

9-11

Pass

ive

com

pone

nt to

su

bcla

use

5.4a

)

Type

: PS0

61M

axim

um o

pera

ting

tem

pera

ture

450

°CTe

mpe

ratu

re c

lass

ifica

tion

dete

rmin

ed b

y m

axim

umm

easu

red

tem

pera

ture

.

Tem

pera

ture

Tra

nsm

itte

rTy

pe: 365S

(exa

mp

le)

Pan

Inc.

, Bos

ton,

USA

Ex ia

IIC

T4 b

y FU

ML

No. 9

8306

5Am

bien

t tem

pera

ture

–40

°Cto

+80

°C

Term

ina

ls ‘A

’Uo

: 1.0

VIo

: 10

mA

Po: 2

.5 m

WCo

: 100

0μF

Lo: 3

50 m

H

Note

: If c

able

‘x’ b

ecom

es

part

of a

mul

ticor

e, th

en th

is

mul

ticor

e ca

ble

mus

t be

aTy

pe ‘A

’ or ‘

B’, a

s sp

ecifi

edin

IEC

6007

9-14

.

1213

4.5

The

use

of a

ppar

atus

with

‘si

mpl

e ap

para

tus’

in

put d

escr

iptio

nTh

e ot

her c

omm

on u

se fo

r the

sim

ple

appa

ratu

s cl

ause

is to

per

mit

the

use

of c

ertifi

ed a

ppar

atus

with

inpu

t pa

ram

eter

s eq

uiva

lent

to

sim

ple

appa

ratu

s, to

be

adde

d to

an

exis

ting

intri

nsic

ally

saf

e ci

rcui

t with

onl

y a

min

or c

hang

e in

the

docu

men

tatio

n. T

he m

ost

frequ

ent u

ses

of th

is te

chni

que

are

for t

est e

quip

men

t, in

dica

tors

an

d tri

p am

plifi

ers.

A ty

pica

l ex

ampl

e of

thi

s ty

pe o

f ap

plic

atio

n is

the

MTL

531

4 tri

p am

plifi

er w

hich

is

frequ

ently

use

d to

mon

itor

the

4-20

mA

sign

als

from

a t

rans

mitt

er a

s ill

ustra

ted

in F

igur

e 4.

3. T

he in

put

term

inal

s sa

tisfy

the

requ

irem

ents

of s

impl

e ap

para

tus

and

henc

e th

e in

serti

on o

f th

is a

ppar

atus

doe

s no

t re

quire

tha

t th

e sa

fety

an

alys

is o

f th

e ex

istin

g sy

stem

is m

odifi

ed. T

he p

rese

nce

of t

he

trip

ampl

ifier

and

the

fact

that

it is

rega

rded

as

sim

ple

appa

ratu

sis

all

that

nee

ds to

be

reco

rded

.W

here

mor

e th

an o

ne p

iece

of

appa

ratu

s w

ith s

impl

e ap

para

tus

outp

ut c

hara

cter

istic

s is

incl

uded

in a

circ

uit t

hen

care

sho

uld

be

take

n to

ens

ure

that

the

perm

itted

sim

ple

appa

ratu

s pa

ram

eter

s ar

e no

t exc

eede

d. A

dvan

tage

can

som

etim

es b

e ta

ken

of th

e fa

ct

that

the

out

put

volta

ge o

nly

appe

ars

unde

r fa

ult

cond

ition

s an

d

that

it is

per

mitt

ed t

o ap

ply

the

faul

t co

unt

to t

he s

yste

m a

s a

who

le. F

or e

xam

ple

if m

ore

than

one

pie

ce o

f sim

ple

appa

ratu

s is

co

nnec

ted

in th

e ci

rcui

t, th

en it

can

be

argu

ed th

at o

nly

one

piec

e of

app

arat

us is

con

side

red

to fa

il at

any

one

tim

e, a

nd h

ence

onl

y th

e m

ost a

dver

se s

et o

f out

put p

aram

eter

s ne

eds

to b

e co

nsid

ered

. Th

is ty

pe o

f arg

umen

t is

acce

ptab

le in

‘ib’

sys

tem

s bu

t nee

ds to

be

car

eful

ly d

ocum

ente

d. F

or s

uch

an a

rgum

ent

to b

e va

lid f

or

‘ia’

syst

ems

deta

iled

know

ledg

e of

the

der

ivat

ion

of t

he o

utpu

t pa

ram

eter

s is

req

uire

d. T

his

info

rmat

ion

is n

ot u

sual

ly r

eadi

ly

avai

labl

e an

d he

nce

the

tech

niqu

e is

not

nor

mal

ly a

pplic

able

to

‘ia’ s

yste

ms.

If it

is k

now

n th

at th

e ap

para

tus

term

inal

s ar

e pu

rely

re

sist

ive

in n

orm

al o

pera

tion

(as

is fr

eque

ntly

the

case

) the

n an

y nu

mbe

r of t

hese

dev

ices

can

be

inco

rpor

ated

in a

n ‘ic

’ sys

tem

.

5.1

Gene

ral

The

abili

ty to

do

live

mai

nten

ance

on

an in

trins

ical

ly s

afe

syst

em

is a

maj

or b

enefi

t of

the

tec

hniq

ue.

It is

diffi

cult

to t

est

an

inst

rum

ent s

yste

m w

ith th

e po

wer

rem

oved

, and

diffi

cult

to o

btai

n a

mea

ning

ful ‘

gas

clea

ranc

e ce

rtific

ate’

that

cov

ers

the

who

le o

f th

e ar

ea a

ffect

ed b

y a

syst

em. C

onse

quen

tly li

ve w

orki

ng is

ver

y de

sira

ble.

The

re a

re h

owev

er fa

ctor

s, o

ther

than

gas

igni

tion,

that

ha

ve t

o be

con

side

red

whe

neve

r an

inst

rum

ent

syst

em is

tak

en

out

of c

omm

issi

on a

nd c

onse

quen

tly lo

cal s

afet

y pr

actic

es s

uch

as ‘p

erm

its to

wor

k’ h

ave

still

to b

e ob

serv

ed.

5.2

Perm

itted

pra

ctic

es o

n th

e pl

ant

The

desi

gn o

f in

trins

ical

ly s

afe

appa

ratu

s an

d sy

stem

s en

sure

s th

at th

e sh

ort c

ircui

t and

ope

n ci

rcui

t of fi

eld

wiri

ng c

anno

t cau

se

igni

tion

of a

gas

atm

osph

ere.

The

con

cept

of l

ive

mai

nten

ance

use

s th

is fe

atur

e bu

t doe

s no

t ext

end

to c

arry

ing

out d

etai

led

repa

irs;

for e

xam

ple,

repa

iring

prin

ted

circ

uit b

oard

s w

ithin

the

haza

rdou

s ar

eas.

In

prac

tice,

the

per

mis

sibl

e ac

tions

are

res

trict

ed b

y th

e av

aila

ble

tool

s he

nce

deci

ding

wha

t is

perm

issi

ble

is n

ot d

ifficu

lt.

IEC

6007

9-17

rest

ricts

live

‘wor

king

’ to:

i) d

isco

nnec

tion

of,

and

rem

oval

or

repl

acem

ent

of e

lect

rical

ap

para

tus

and

cabl

ing

ii)

adju

stm

ent

of a

ny c

ontro

ls w

hich

is

nece

ssar

y fo

r th

e ca

libra

tion

of th

e el

ectri

cal a

ppar

atus

or s

yste

miii)

rem

oval

and

rep

lace

men

t of

any

plu

g in

com

pone

nts

or

asse

mbl

ies

iv)

use

of a

ny t

est

inst

rum

ents

spe

cifie

d in

the

rel

evan

t do

cum

enta

tion.

Whe

re te

st in

stru

men

ts a

re n

ot s

peci

fied

in th

e re

leva

nt d

ocum

enta

tion,

onl

y th

ose

inst

rum

ents

, whi

ch d

o no

t af

fect

the

intri

nsic

saf

ety

of th

e ci

rcui

t, m

ay b

e us

edv)

any

oth

er m

aint

enan

ce a

ctiv

ity s

peci

fical

ly p

erm

itted

by

the

“rel

evan

t doc

umen

tatio

n”Th

ese

requ

irem

ents

are

in

line

with

the

nor

mal

pra

ctic

e of

m

aint

enan

ce o

n fie

ld m

ount

ed e

quip

men

t an

d he

nce

crea

te n

o pr

oble

m. W

ork

on a

ssoc

iate

d sa

fe a

rea

appa

ratu

s, s

uch

as t

he

intri

nsic

ally

saf

e in

terfa

ce is

rest

ricte

d in

the

sam

e w

ay, e

xcep

t tha

t th

ere

is g

reat

er fr

eedo

m to

ope

rate

on

the

safe

are

a te

rmin

als.

Rece

ntly

dev

elop

ed in

terfa

ces

tend

to o

pera

te fr

om 2

4V s

uppl

ies

and

ther

e is

no

risk

of e

lect

rocu

tion.

How

ever

it is

not

unu

sual

fo

r in

terfa

ces

with

rel

ay o

utpu

ts to

be

switc

hing

hig

her

volta

ges,

w

hich

may

cre

ate

a si

gnifi

cant

sho

ck ri

sk. W

here

this

risk

occ

urs,

ad

equa

te w

arni

ng la

bels

are

requ

ired

and

the

rele

vant

pre

caut

ions

sh

ould

be

take

n du

ring

the

mai

nten

ance

pro

cess

.Th

ere

is n

o ris

k of

a s

igni

fican

t el

ectri

c sh

ock

bein

g re

ceiv

ed

by a

tec

hnic

ian

wor

king

on

an i

ntrin

sica

lly s

afe

circ

uit.

Ther

e is

a h

ypot

hetic

al p

ossi

bilit

y bu

t in

pra

ctic

e th

is i

s no

t a

real

pr

oble

m a

ctio

ns a

re p

erm

itted

, the

y ar

e fre

quen

tly e

mbo

died

in

the

appa

ratu

s ce

rtific

ate

and

man

ufac

ture

r’s i

nstru

ctio

n. T

his

info

rmat

ion

shou

ld b

e m

ade

avai

labl

e to

the

rel

evan

t te

chni

cian

on

the

wor

k sh

eet,

as h

e is

not

like

ly to

hav

e re

ady

acce

ss to

the

certi

ficat

e an

d/or

inst

ruct

ions

. The

app

arat

us m

arki

ng w

ould

car

ry

the

ubiq

uito

us ‘X

’ m

arki

ng b

ut t

his

is a

lmos

t un

iver

sally

app

lied

and

cons

eque

ntly

larg

ely

igno

red.

Mai

nten

ance

and

Rep

air o

f In

trins

ical

ly S

afe

equi

pmen

t5.

3 Pe

rmitt

ed p

ract

ice

in th

e w

orks

hop

The

repa

ir an

d te

stin

g of

in

trins

ical

ly

safe

an

d as

soci

ated

ap

para

tus

shou

ld o

nly

be c

arrie

d ou

t in

favo

urab

le c

ondi

tions

and

by

ade

quat

ely

train

ed te

chni

cian

s. T

he IE

C st

anda

rd IE

C 60

079-

19

prov

ides

som

e gu

idan

ce o

n th

e ap

proa

ch to

repa

ir of

intri

nsic

ally

sa

fe e

quip

men

t.Th

ere

are

alw

ays

prac

tical

and

eco

nom

ic li

mita

tions

on

wha

t is

pr

actic

able

. For

exa

mpl

e, s

hunt

dio

de s

afet

y ba

rrie

rs a

re in

varia

bly

enca

psul

ated

and

not

repa

irabl

e. Is

olat

ing

inte

rface

s ar

e us

ually

in

boxe

s th

at a

re d

ifficu

lt to

ope

n, c

oate

d in

var

nish

and

impo

ssib

le to

te

st in

det

ail w

ithou

t spe

cial

ist t

est e

quip

men

t and

kno

wle

dge

of

the

circ

uit.

In g

ener

al re

plac

emen

t by

an id

entic

al u

nit i

s pr

efer

red

for b

oth

econ

omic

and

saf

ety

reas

ons.

Som

e re

pairs

can

be

carr

ied

out

with

out

affe

ctin

g th

e sa

fety

of

equi

pmen

t an

d, u

sual

ly, i

t is

obv

ious

wha

t lim

itatio

ns a

pply

. For

ex

ampl

e, d

amag

e to

enc

losu

res

does

not

usu

ally

dire

ctly

affe

ct

the

intri

nsic

saf

ety

of a

ppar

atus

and

con

sequ

ently

a re

pair

whi

ch

rest

ores

the

enc

losu

re t

o its

orig

inal

leve

l of

inte

grity

(IP

rat

ing)

is

acc

epta

ble.

The

rep

air

of p

rinte

d ci

rcui

t bo

ards

is s

omet

imes

co

nsid

ered

but

is

usua

lly i

mpr

actic

able

. Re

mov

ing

com

pone

nts

with

out

dam

agin

g th

e bo

ard

is d

ifficu

lt, r

epai

ring

the

coat

ing

on r

eass

embl

y is

mes

sy a

nd m

aint

aini

ng t

he o

rigin

al c

reep

age

and

clea

ranc

e di

stan

ces

may

not

be

poss

ible

. A r

ecen

t fu

rther

co

mpl

icat

ion

is th

at if

lead

free

sol

der

has

been

use

d, th

e us

e of

so

lder

con

tain

ing

lead

usu

ally

resu

lts in

uns

atis

fact

ory

join

ts.

A re

cord

of a

ny re

pairs

sho

uld

be m

aint

aine

d. T

he u

se o

f bef

ore

and

afte

r pho

togr

aphs

(sto

red

digi

tally

) fre

quen

tly s

impl

ifies

the

proc

ess.

5.4

Test

ing

of IS

app

arat

us u

sing

non

-cer

tified

test

app

arat

usTh

ere

are

two

circ

umst

ance

s un

der

whi

ch n

on-c

ertifi

ed t

est

appa

ratu

s is u

sed

to te

st in

trins

ical

ly sa

fe a

nd a

ssoc

iate

d ap

para

tus

and

syst

ems.

One

is w

here

app

arat

us is

test

ed in

the

safe

are

a,

usua

lly d

isco

nnec

ted

from

the

IS

syst

em,

and,

les

s fre

quen

tly,

whe

n ap

para

tus

and

the

syst

em is

test

ed in

the

haza

rdou

s ar

ea

usin

g a

gas

clea

ranc

e ce

rtific

ate.

It is

som

etim

es q

uest

ione

d w

heth

er c

onne

ctin

g no

n-ce

rtifie

d ap

para

tus

durin

g su

ch p

roce

dure

s ca

n re

sult

in t

he i

ntrin

sic

safe

ty o

f th

e ap

para

tus

or s

yste

m b

eing

im

paire

d by

dam

age

to t

he s

afet

y co

mpo

nent

s. I

n th

e pa

st,

test

ing

has

not

requ

ired

any

spec

ial p

reca

utio

ns to

be

take

n to

avo

id th

is p

ossi

bilit

y. T

he

curr

ent

stan

dard

on

insp

ectio

n an

d m

aint

enan

ce I

EC 6

0079

-17

does

not

add

ress

this

que

stio

n, c

onse

quen

tly th

e fo

llow

ing

is o

nly

a co

nsid

ered

opi

nion

and

sho

uld

be re

gard

ed a

s su

ch.

Fig

ure

4.3

MTL

5314

use

d as

mon

itor

5.

Sim

ple

Ap

pa

ratu

s, I

ntr

insi

ca

lly

Sa

fe in

terf

ace,

Trip

Am

plifi

er

MTL5314.

The

Trip

Am

plifi

er c

onne

cts

in s

erie

s w

ith th

e 4/

20

mA

trans

mitt

er c

ircui

t, gi

ving

ala

rm s

igna

ls to

the

safe

are

a vi

a ch

ange

over

rela

ys.

Usin

g th

e Si

mpl

e Ap

para

tus

(Non

-ene

rgy

Stor

ing)

ru

le th

e de

vice

may

be

conn

ecte

d in

ser

ies

with

th

e ha

zard

ous

side

of t

he M

TL55

41.

Cert

ifica

tion

& S

afe

ty P

ara

mete

rs

Term

inal

s 1

and

3 m

eet t

he S

impl

e Ap

para

tus

rule

s ha

ving

out

put p

aram

eter

s:

Uo: 1

.0V,

Io: 8

8mA,

Po:

22m

WCe

rtifie

d [E

Ex ia

] IIC

by

EECS

No. B

AS 9

8 AT

EX 7

136

Tam

b –2

0°C

to +

60°C

Um: 2

50 V

1415

5.4

Test

ing

of IS

app

arat

us u

sing

non

-cer

tified

test

app

arat

us -

con

tinue

d A

rele

vant

poi

nt is

tha

t du

ring

the

man

ufac

turin

g of

intri

nsic

ally

sa

fe p

rodu

cts,

the

equ

ipm

ent

used

for

bot

h op

erat

iona

l an

d sa

fety

tes

ting

relie

s on

goo

d en

gine

erin

g pr

actic

e an

d re

gula

r in

spec

tion

to a

chie

ve a

dequ

ate

safe

ty.

It is

not

sub

ject

to

third

pa

rty c

ertifi

catio

n or

any

sim

ilar c

onst

rain

ts. T

he a

ppar

atus

des

ign

stan

dard

s ad

dres

s so

me

of t

he m

ore

obvi

ous

risks

, suc

h as

the

ch

argi

ng o

f bat

terie

s, b

ut d

o no

t mak

e an

y ot

her r

ecom

men

datio

ns

to c

over

less

freq

uent

ly u

sed

faci

litie

s.Th

e fa

ctor

s, w

hich

just

ify th

e us

e of

con

vent

iona

l tes

t equ

ipm

ent

whe

n w

orki

ng o

n in

trins

ical

ly s

afe

appa

ratu

s, a

re:

a) R

epai

r and

mai

nten

ance

sho

uld

only

be

carr

ied

out b

y ‘sk

illed

pe

rson

nel’.

Su

ch

pers

onne

l sh

ould

be

ad

equa

tely

tra

ined

to

rec

ogni

se w

heth

er a

mis

take

cou

ld h

ave

caus

ed d

amag

e,

whi

ch m

ight

lead

to a

dan

gero

us s

ituat

ion,

and

be

capa

ble

of

taki

ng a

ny n

eces

sary

cor

rect

ive

actio

n.b

) Te

st e

quip

men

t sh

ould

be

chec

ked

to e

nsur

e th

at i

t is

op

erat

iona

l be

fore

con

nect

ing

it to

the

app

arat

us.

Parti

cula

r ca

re s

houl

d be

take

n to

ens

ure

that

any

var

iabl

e co

ntro

ls, s

uch

as o

utpu

t vol

tage

and

cur

rent

lim

its o

n po

wer

sup

plie

s, a

re s

et

to th

e co

rrec

t val

ues

befo

re m

akin

g th

e in

terc

onne

ctio

n. T

he te

st

equi

pmen

t sho

uld

be c

heck

ed a

t the

end

of t

he te

st. S

ince

the

test

equ

ipm

ent i

s on

ly c

onne

cted

for a

sho

rt tim

e th

e pr

obab

ility

of

it fa

iling

in a

way

that

can

cau

se a

pot

entia

lly h

azar

dous

faul

t in

that

tim

e is

acc

epta

bly

low

.c) T

he a

ppar

atus

sho

uld

be fu

nctio

ning

cor

rect

ly a

nd b

e fre

e of

m

echa

nica

l dam

age

at th

e en

d of

the

test

or r

e-ca

libra

tion.

It is

po

ssib

le th

at a

saf

ety

com

pone

nt fa

ilure

will

not

affe

ct o

pera

tiona

l ca

pabi

lity

but u

sual

ly a

n op

erat

iona

l fai

lure

will

als

o oc

cur.

d)

The

mor

e co

mpl

ex o

pera

tions

suc

h as

re-

prog

ram

min

g an

d do

wnl

oadi

ng o

f ap

para

tus

mem

orie

s ar

e no

rmal

ly d

one

usin

g te

st r

igs

with

spe

cific

plu

gs a

nd s

ocke

ts a

nd h

ence

the

prob

abili

ty o

f inc

orre

ct c

onne

ctio

n is

redu

ced.

e)

Test

eq

uipm

ent

that

sa

tisfie

s th

e pe

rson

nel

safe

ty

requ

irem

ents

of I

EC 6

1010

, is

not l

ikel

y to

pro

duce

cur

rent

s or

vo

ltage

s, w

hich

will

dam

age

safe

ty c

ompo

nent

s. F

or e

xam

ple

a fu

nctio

ning

osc

illos

cope

with

hig

h im

peda

nce

prob

es i

s ex

trem

ely

unlik

ely

to c

ause

a p

robl

em.

Ther

e ar

e so

me

oper

atio

ns w

hich

do

requ

ire s

peci

al c

are,

of w

hich

th

e m

ost

obvi

ous

is h

igh

volta

ge in

sula

tion

test

ing.

Thi

s sh

ould

on

ly b

e do

ne w

hen

a sp

ecia

l wor

k in

stru

ctio

n is

ava

ilabl

e.In

pra

ctic

e su

ch te

sts

are

best

avo

ided

and

if a

n in

sula

tion

test

is

thou

ght t

o be

nec

essa

ry it

sho

uld

be d

one

at a

low

vol

tage

. It i

s ge

nera

lly a

ccep

ted

that

the

test

ing,

cal

ibra

tion

and

prog

ram

min

g of

intri

nsic

ally

safe

app

arat

us in

a sa

fe a

rea,

or u

nder

gas

clea

ranc

e co

nditi

ons

by a

com

pete

nt p

erso

n us

ing

conv

entio

nal h

igh

qual

ity

test

equ

ipm

ent d

oes

not i

nval

idat

e its

intri

nsic

saf

ety

certi

ficat

ion.

5.5

Re-u

se o

f int

rinsi

cally

saf

e fie

ld d

evic

esTh

e qu

estio

n is

som

etim

es r

aise

d as

to

whe

ther

int

rinsi

cally

sa

fe a

ppar

atus

whi

ch h

as b

een

used

in

circ

uits

whi

ch a

re n

ot

intri

nsic

ally

saf

e, s

uch

as n

on-in

cend

ive

or s

afe

area

circ

uits

can

su

bseq

uent

ly b

e us

ed in

intri

nsic

ally

saf

e ci

rcui

ts. T

he p

erce

ived

pr

oble

m i

s th

at u

se i

n th

e no

n-in

trins

ical

ly s

afe

circ

uits

cou

ld

caus

e da

mag

e, w

hich

is n

ot s

elf-

reve

alin

g bu

t wou

ld r

educ

e th

e le

vel o

f pro

tect

ion

offe

red

by th

e or

igin

al c

ertifi

catio

n. T

he re

leva

nt

IEC

stan

dard

s do

not

giv

e an

y gu

idan

ce o

n th

is to

pic

and

henc

e th

e fo

llow

ing

text

is o

nly

a co

nsid

ered

opi

nion

, whi

ch m

ay n

ot b

e un

iver

sally

acc

epte

d.Th

e qu

estio

n no

rmal

ly a

rises

bec

ause

it

is c

omm

on p

ract

ice

on m

ost

petro

chem

ical

ins

talla

tions

to

purc

hase

a s

ingl

e ty

pe

of in

stru

men

t, fo

r ex

ampl

e a

pres

sure

tra

nsm

itter

, for

use

in a

ll lo

catio

ns o

n a

plan

t. An

intri

nsic

ally

saf

e tra

nsm

itter

can

then

be

used

on

a te

mpo

rary

inst

alla

tion

in a

saf

e ar

ea in

a c

onve

ntio

nal

safe

are

a lo

op, a

nd a

fter

som

e tim

e be

ret

urne

d to

the

sto

re a

s a

spar

e in

stru

men

t. Fr

om th

e st

ore

it co

uld

be u

sed

to r

epla

ce a

de

fect

ive

inst

rum

ent i

n an

intri

nsic

ally

saf

e lo

op.

It ca

n be

ass

umed

that

the

repl

acin

g in

stru

men

t is

func

tiona

l, an

d no

t mec

hani

cally

dam

aged

(the

maj

ority

of i

nstru

men

t tec

hnic

ians

w

ould

che

ck t

his

in t

he w

orks

hop

befo

re p

uttin

g th

e in

stru

men

t in

the

stor

es a

s a

spar

e) a

nd th

eref

ore

the

conc

ern

is th

at th

ere

is s

ome

faul

t w

hich

red

uces

the

saf

ety

inte

grity

but

doe

s no

t af

fect

the

ope

ratio

n of

the

inst

rum

ent.

Alm

ost

all f

aults

fro

m a

n ex

tern

al s

ourc

e w

ould

cau

se s

uffic

ient

dam

age

to th

e ap

para

tus

for

it to

mal

func

tion,

rat

her

than

cau

se t

he c

onse

rvat

ivel

y ra

ted

safe

ty c

ompo

nent

s to

fail

to d

ange

r w

ithou

t dam

agin

g an

y ot

her

com

pone

nts.

Thi

s ty

pe o

f und

etec

ted

failu

re is

just

pos

sibl

e bu

t is

suffi

cien

tly im

prob

able

to

be ig

nore

d. In

the

par

ticul

ar c

ase

of a

no

n-in

cend

ive

inst

alla

tion

then

the

sele

ctio

n of

app

arat

us, a

nd th

e in

stal

latio

n co

de fo

llow

ed fu

rther

red

uce

the

prob

abili

ty o

f the

IS

appa

ratu

s be

ing

stre

ssed

.Th

ere

are

a nu

mbe

r of

circ

umst

ance

s w

here

a v

ery

sim

ilar

risk

occu

rs, a

nd t

he r

isk

is c

onsi

dere

d ac

cept

able

. A v

ery

clea

r ex

ampl

e is

that

the

IEC

stan

dard

on

insp

ectio

n an

d m

aint

enan

ce

(IEC

6007

9-17

), pe

rmits

the

use

of

non-

certi

fied

test

equ

ipm

ent

unde

r ‘g

as c

lear

ance

cer

tifica

te’

cond

ition

s. S

imila

r ris

ks a

re

acce

pted

dur

ing

faul

t-fin

ding

pro

cedu

res i

n in

stru

men

t wor

ksho

ps.

Ther

e ar

e al

so s

igni

fican

t ris

ks o

f suc

h fa

ults

occ

urrin

g du

ring

the

repa

ir pr

oedu

res

perm

itted

by

the

sam

e st

anda

rd o

n re

pairi

ng th

is

type

of a

ppar

atus

. The

test

equ

ipm

ent u

sed

in th

e fin

al s

tage

s of

m

anuf

actu

ring

of IS

equ

ipm

ent i

s no

t des

igne

d to

be

faul

t tol

eran

t an

d co

uld

prod

uce

unde

tect

ed f

aults

. The

se r

isks

illu

stra

te t

he

poin

t tha

t whe

re a

risk

is s

mal

l it c

an b

e, a

nd is

, acc

epte

d.W

ith t

he r

ecen

t in

trodu

ctio

n of

the

‘ic

’ co

ncep

t, th

is q

uest

ion

beco

mes

mor

e re

leva

nt to

intri

nsic

ally

saf

e ci

rcui

ts; f

or e

xam

ple,

th

e us

e of

an

‘ia’ c

ertifi

ed tr

ansm

itter

in a

n ‘ia

’ sys

tem

afte

r it h

as

been

use

d in

an

‘ic’ s

yste

m m

ay b

e qu

estio

ned.

The

que

stio

n of

th

e tra

nsfe

r of a

ppar

atus

from

an

‘ib’ s

yste

m to

an

‘ia’ s

yste

m h

as

neve

r bee

n ra

ised

as

far a

s is

kno

wn.

The

conc

lusi

on is

ther

efor

e th

at th

e sa

fety

sta

tus

of a

fiel

d de

vice

is

not c

hang

ed p

rovi

ded

that

the

devi

ce is

bot

h fu

nctio

ning

cor

rect

ly

and

not

mec

hani

cally

dam

aged

afte

r be

ing

used

in a

ny t

ype

of

circ

uit.

If th

ese

two

requ

irem

ents

are

met

, the

fiel

d de

vice

can

be

used

in a

n in

trins

ical

ly s

afe

circ

uit w

ithou

t fur

ther

con

side

ratio

n.

6.1

Gene

ral

A nu

mbe

r of

fine

ly d

ivid

ed m

ater

ials

can

be

igni

ted

to c

reat

e an

ex

plos

ion

whe

n th

ey f

orm

a c

loud

in a

ir. A

lmos

t al

l org

anic

and

fo

od p

rodu

ct d

usts

tog

ethe

r w

ith m

etal

lic d

ust

can

read

ily b

e ig

nite

d. D

ust e

xplo

sion

s ar

e ge

nera

lly m

ore

diffi

cult

to in

itiat

e th

an

gas/

air

expl

osio

ns b

ut c

an b

e de

vast

atin

g. T

he i

nitia

l ex

plos

ion

frequ

ently

dis

turb

s an

d en

train

s la

yere

d du

st t

o cr

eate

one

or

mor

e se

cond

ary

expl

osio

ns, t

hus

crea

ting

a ro

lling

exp

losi

on a

nd

exte

nsiv

e da

mag

e.Du

st e

xplo

sion

s ca

n be

ini

tiate

d by

ele

ctric

al s

park

s or

by

hot

surfa

ces.

The

re a

re n

umer

ous

fact

ors,

whi

ch i

nflue

nce

igni

tion

ener

gy a

nd te

mpe

ratu

re o

f a p

artic

ular

mat

eria

l. Fo

r exa

mpl

e th

e ai

r to

par

ticle

rat

io,

the

parti

cle

size

, hu

mid

ity,

and

the

mel

ting

tem

pera

ture

of t

he m

ater

ial.

Note

: Fo

r th

ose

requ

iring

a

com

preh

ensi

ve

refe

renc

e ‘D

ust

expl

osio

ns in

the

proc

ess

indu

strie

s’ b

y Ro

lf. K

. Eck

hoff

publ

ishe

d by

Bu

tterw

orth

Hei

nem

ann.

ISBN

0 7

506

3270

4 is

reco

mm

ende

d.Th

e ig

nitio

n en

ergy

of a

dus

t/air

mix

ture

is h

igh

com

pare

d w

ith th

at

of a

gas

/air

mix

ture

. For

exa

mpl

e, s

ome

sens

itive

mat

eria

ls s

uch

as ru

bber

, sul

fur a

nd fi

ne w

ood

dust

requ

ire 1

to 1

0 m

J w

hile

less

se

nsiti

ve m

ater

ials

, suc

h as

cof

fee,

requ

ire m

ore

than

500

mJ.

Ther

e is

som

e co

ncer

n th

at s

ome

very

fine

ly d

ivid

ed p

artic

les,

for

exam

ple

thos

e as

soci

ated

with

nan

o-te

chno

logy

, may

hav

e ev

en

low

er ig

nitio

n en

ergi

es. C

onse

quen

tly, t

he d

ecis

ion

has

been

mad

e to

use

the

IIB

gas

as t

he t

est

mix

ture

(ig

nitio

n en

ergy

80μ

J) f

or

intri

nsic

ally

safe

app

arat

us fo

r use

in d

ust a

tmos

pher

es. T

his i

s a ve

ry

cons

erva

tive

deci

sion

but

pre

sent

s ve

ry li

ttle

oper

atio

nal d

ifficu

lty.

The

curre

nt s

tate

of k

now

ledg

e on

the

spar

k ig

nitio

n ch

arac

teris

tics

of d

usts

and

the

diffi

culty

of c

reat

ing

a sa

tisfa

ctor

y te

st a

ppar

atus

fo

r dus

t atm

osph

eres

just

ifies

a c

autio

us p

rude

nt d

ecis

ion.

The

maj

or p

robl

em i

n du

st a

tmos

pher

es i

s th

e po

ssib

ility

of

ther

mal

igni

tion.

The

re a

re tw

o co

mm

on m

echa

nism

s, o

ne is

the

igni

tion

of a

dus

t clo

ud b

y a

hot b

ody

and

the

othe

r is

the

crea

tion

of s

mou

lder

ing

in a

laye

r of d

ust o

n a

hot s

urfa

ce.

The

min

imum

ign

ition

tem

pera

ture

of

the

maj

ority

of

dust

s lie

s be

twee

n 30

0°C

and

600°

C. S

ome

dust

s do

igni

te a

t lo

wer

te

mpe

ratu

res,

for

exa

mpl

e fin

ely

divi

ded

sulfu

r ha

s a

min

imum

ig

nitio

n te

mpe

ratu

re o

f 240

°C. I

t is

quite

diffi

cult

to g

ener

ate

thes

e te

mpe

ratu

res

in a

dus

t clo

ud w

ith th

e po

wer

leve

ls p

erm

itted

by

a IIB

gas

cla

ssifi

catio

n an

d he

nce

the

prob

abili

ty o

f ig

nitio

n of

a

dust

clo

ud b

y in

trins

ical

ly s

afe

appa

ratu

s is

qui

te lo

w a

nd n

ot th

e m

ajor

pro

blem

.

Intri

nsic

Saf

ety

and

Dust Th

e pr

inci

pal d

ifficu

lty is

the

pos

sibi

lity

of c

ausi

ng s

mou

lder

ing

with

in a

dus

t lay

er, w

hich

whe

n di

stur

bed

burs

ts in

to fl

ames

and

in

itiat

es a

n ex

plos

ion.

The

mec

hani

sm o

f cau

sing

sm

ould

erin

g is

co

mpl

ex b

ut c

an b

e si

mpl

ified

into

kee

ping

the

dust

bel

ow it

s ‘gl

ow

tem

pera

ture

’. Th

e m

ajor

ity o

f mat

eria

ls h

ave

a gl

ow te

mpe

ratu

re,

rang

ing

from

250

°C t

o 50

0°C,

tha

t is

low

er t

han

the

min

imum

ig

nitio

n te

mpe

ratu

re o

f the

cor

resp

ondi

ng d

ust c

loud

.Th

ere

are

also

som

e fla

mm

able

dus

t lay

ers

that

hav

e th

e fo

rtuna

te

char

acte

ristic

of

mel

ting

befo

re a

ttain

ing

thei

r th

eore

tical

glo

w

tem

pera

ture

and

con

sequ

ently

they

do

not c

reat

e th

is ig

nitio

n ris

k (fo

r exa

mpl

e po

lyst

yren

e).

6.2

Intr

insi

cally

saf

e ap

para

tus

and

dust

sIn

trins

ical

ly s

afe

appa

ratu

s ce

rtifie

d fo

r us

e in

haz

ardo

us g

as

atm

osph

eres

has

bee

n us

ed to

ens

ure

safe

ty in

dus

t atm

osph

eres

fo

r m

any

year

s. C

urre

ntly

a g

reat

dea

l of

activ

ity is

tak

ing

plac

e to

form

alis

e th

e re

quire

men

ts fo

r app

arat

us s

peci

fical

ly fo

r use

in

dust

s. A

n ap

para

tus

stan

dard

IEC

6124

1-11

is n

ow p

ublis

hed.

The

ul

timat

e in

tent

ion

is to

am

alga

mat

e th

e du

st a

nd g

as re

quire

men

ts

with

in t

he r

elev

ant

IEC

stan

dard

s bu

t th

is w

ill t

ake

a nu

mbe

r of

ye

ars

(five

?).

Even

tual

ly t

here

will

be

thre

e le

vels

of

prot

ectio

n ‘ia

D’, ‘

ibD’

, and

‘icD

’ cor

resp

ondi

ng to

the

equi

vale

nt g

as le

vels

of

prot

ectio

n (s

ee Ta

ble

6.1)

. The

inte

ntio

n is

that

‘iaD

’ equ

ipm

ent w

ill

achi

eve

the

‘ver

y hi

gh’ l

evel

of p

rote

ctio

n re

quire

d by

equ

ipm

ent

desi

gnat

ed a

s ‘E

PL D

a’ (w

here

EPL

mea

ns ‘E

quip

men

t Pro

tect

ion

Leve

l’ as

defi

ned

in I

EC60

079-

0).

‘ibD’

with

a ‘

high

’ le

vel

of

prot

ectio

n w

ill a

chie

ve a

n ‘E

PL D

b’ a

nd ‘i

cD’ w

ith a

n ‘e

nhan

ced’

le

vel o

f pro

tect

ion

will

be

‘EPL

Dc’

.

Tab

le 6

.1 -

Com

paris

on o

f diff

eren

t lev

els

of ri

sk

6.

Leve

l of

C

ou

nta

ble

Leve

l of

E

qu

ipm

en

t

ATE

X

Norm

al

pro

tecti

on

fa

ult

s

risk

P

rote

cti

on

ca

teg

ory

zo

ne o

f u

se

Leve

l -

EP

L

iaD

2

ve

ry h

igh

Da

1

20

ibD

1

hi

gh

Db

2

21ic

D

0

cons

ider

able

Dc

3

22

MTL4850 H

AR

T® M

ultip

lexe

r.

1617

6.2

Intr

insi

cally

saf

e ap

para

tus

and

dust

s -

cont

inue

d Th

e ris

k of

spar

k ig

nitio

n is

avo

ided

by s

atis

fyin

g th

e re

quire

men

ts fo

r ap

para

tus

inte

nded

for u

se in

IIB

gase

s To

avo

id th

e ris

k of

ther

mal

ig

nitio

n th

e pr

efer

red

tech

niqu

e fo

r app

arat

us, w

hich

is in

tend

ed to

be

loca

ted

in th

e ha

zard

ous

area

, is

to e

xclu

de th

e du

st b

y us

ing

an IP

6X

encl

osur

e or

by

enca

psul

atio

n. T

his

invo

lves

det

erm

inin

g a

max

imum

tem

pera

ture

rise

of t

he e

xpos

ed s

urfa

ce, w

hich

in th

e ca

se o

f mos

t int

rinsi

cally

saf

e ap

para

tus

will

be

very

sm

all.

The

pref

eren

ce f

or a

dus

t tig

ht e

nclo

sure

is

beca

use

the

‘dus

t fra

tern

ity’ h

as im

plic

it fa

ith in

this

tech

niqu

e. It

can

be

argu

ed th

at

the

rest

rictio

n of

the

avai

labl

e po

wer

is a

mor

e re

liabl

e te

chni

que

as it

is le

ss p

rone

to m

aint

enan

ce e

rror

s.Th

ere

is a

n ex

empt

ion

to th

e en

clos

ure

rule

for

appa

ratu

s th

at is

di

fficu

lt to

ope

rate

ins

ide

an e

nclo

sure

, su

ch a

s so

me

sens

ors.

In

thes

e ci

rcum

stan

ces

the

pow

er le

vel i

s re

stric

ted

to a

void

the

poss

ibili

ty o

f tem

pera

ture

igni

tion

(750

mW

at 4

00°C

), In

pra

ctic

e al

l in

trins

ical

ly

safe

as

soci

ated

ap

para

tus

such

as

ba

rrie

rs

and

isol

ated

int

erfa

ces,

whi

ch a

re I

IC o

r IIB

cer

tified

for

gas

es

are

suita

ble

for

use

in in

trins

ical

ly s

afe

syst

ems.

It is

has

bee

n co

mm

on p

ract

ice

for

seve

ral y

ears

for

inte

rface

s to

be

certi

fied

for b

oth

gas

and

dust

app

licat

ions

. For

exa

mpl

e, th

e cu

rren

t MTL

ra

nge

of b

arrie

rs (

MTL

7700

) an

d is

olat

ors

(MTL

4500

/550

0) a

re

certi

fied

for b

oth

gas

and

dust

app

licat

ions

in a

ccor

danc

e w

ith th

e re

quire

men

ts o

f the

ATE

X Di

rect

ive

and

FM s

tand

ards

. The

des

ign

of in

trins

ical

ly s

afe

appa

ratu

s fo

r use

in d

usts

is th

e su

bjec

t mat

ter

of P

art 1

1 of

IEC

6124

1

6.3

Risk

ana

lysi

sAn

alys

ing

the

risk

asso

ciat

ed w

ith a

flam

mab

le d

ust d

iffer

s fro

m

the

anal

ysis

of a

gas

risk

larg

ely

beca

use

dust

doe

s no

t dis

pers

e in

the

sam

e w

ay a

s a

gas,

it h

as to

be

rem

oved

.A

deci

sion

was

mad

e so

me

year

s ago

to o

nly a

rea

class

ify d

ust c

loud

s an

d to

trea

t the

pos

sibilit

y of

a s

mou

lder

ing

dust

laye

r as

a so

urce

of

igni

tion.

(a d

ecisi

on la

rgel

y in

fluen

ced

by th

e AT

EX D

irect

ives)

.Th

e ar

ea c

lass

ifica

tion

of d

ust

clou

ds f

ollo

ws

the

patte

rn o

f ga

s cl

ouds

. Zo

ne 2

0 co

rres

pond

s to

Zon

e 0

(whe

re t

he h

azar

d is

pr

esen

t co

ntin

uous

ly o

r fo

r lo

ng p

erio

ds)

Zone

21

to Z

one1

and

Zo

ne 2

2 to

Zon

e 2

as t

he p

roba

bilit

y of

the

dus

t cl

oud

bein

g pr

esen

t red

uces

.Ar

ea c

lass

ifica

tion

of d

usts

is th

e su

bjec

t mat

ter o

f Par

t 10

of IE

C 61

241.

If

the

com

bina

tion

of a

rea

clas

sific

atio

n an

d so

urce

s of

ig

nitio

n is

pur

sued

too

dili

gent

ly t

his

can

crea

te s

ome

tortu

ous

thin

king

. For

tuna

tely

, the

app

licat

ion

of a

littl

e pr

agm

atic

com

mon

se

nse

solv

es m

ost i

nstru

men

tatio

n pr

oble

ms.

For e

xam

ple,

if a

tem

pera

ture

sen

sor i

s bu

ried

in a

mou

nd o

f gra

in

for a

con

side

rabl

e le

ngth

of t

ime,

then

it is

reas

onab

le to

use

a le

vel

of p

rote

ctio

n ‘ia

D’ s

ince

dec

idin

g th

e ar

ea c

lass

ifica

tion

is d

ifficu

lt an

d if

the

grai

n is

sm

ould

erin

g it

will

pro

babl

y bu

rst

into

flam

e w

hen

dist

urbe

d an

d co

uld

poss

ibly

exp

lode

. As

it is

not

exp

ensi

ve

to m

ake

the

syst

em ‘

iaD’

, th

is b

ecom

es t

he o

bvio

us s

olut

ion.

Ho

wev

er i

f a

tem

pera

ture

mon

itor

is m

easu

ring

tem

pera

ture

in

a lo

catio

n w

here

it

is i

nfre

quen

tly c

over

ed b

y du

st a

nd c

an b

e re

adily

and

fre

quen

tly c

lean

ed t

hen

a le

vel o

f pr

otec

tion

‘icD’

is

adeq

uate

. It m

ight

stil

l be

expe

dien

t to

use

‘iaD’

equ

ipm

ent b

ut it

is

not

ess

entia

l to

do s

o.

6.4

Why

use

intr

insi

c sa

fety

?Th

e pr

inci

pal

reas

on f

or u

sing

int

rinsi

c sa

fety

is

beca

use

it is

es

sent

ially

a lo

w p

ower

tech

niqu

e. C

onse

quen

tly, t

he ri

sk o

f ign

ition

is

min

imis

ed, a

nd a

dequ

ate

safe

ty c

an b

e ac

hiev

ed w

ith a

leve

l of

confi

denc

e th

at is

not

alw

ays

achi

eved

by

othe

r tec

hniq

ues.

It is

diffi

cult

to a

sses

s th

e te

mpe

ratu

re r

ise,

whi

ch c

an o

ccur

if

equi

pmen

t is

imm

erse

d in

a d

ust b

ecau

se o

f the

man

y (fr

eque

ntly

un

pred

icta

ble)

fac

tors

, w

hich

det

erm

ine

the

tem

pera

ture

ris

e w

ithin

the

dust

laye

r. Th

e sa

fest

tech

niqu

e is

ther

efor

e to

res

trict

th

e av

aila

ble

pow

er t

o th

e lo

wes

t pr

actic

al le

vel.

A m

ajor

fac

tor

in f

avou

r of

int

rinsi

c sa

fety

is

that

the

pow

er l

evel

und

er f

ault

cond

ition

s is

con

trolle

d by

the

syst

em d

esig

n an

d do

es n

ot re

ly o

n th

e le

ss w

ell-s

peci

fied

limita

tion

of fa

ult p

ower

.In

trins

ic sa

fety

als

o ha

s the

adv

anta

ge th

at th

e po

ssib

ility

of i

gniti

on

from

imm

erse

d or

dam

aged

wiri

ng is

min

imis

ed. I

t is

desi

rabl

e to

be

abl

e to

do

‘live

mai

nten

ance

’ on

an

inst

rum

ent

syst

em, a

nd

the

use

of th

e in

trins

ical

ly s

afe

tech

niqu

e pe

rmits

this

with

out t

he

nece

ssity

of s

peci

al ‘d

ust f

ree’

cer

tifica

tes.

The

re is

a n

eed

to c

lear

la

yers

of d

ust c

aref

ully

and

to a

void

con

tam

inat

ion

of th

e in

terio

r of

appa

ratu

s du

ring

mai

nten

ance

but

this

is a

ppar

ent t

o an

y tra

ined

te

chni

cian

. (Th

ere

is n

o si

gnifi

cant

pos

sibi

lity

of a

per

son,

in a

dus

t cl

oud

that

can

be

igni

ted,

sur

vivi

ng w

ithou

t bre

athi

ng a

ppar

atus

).To

sum

mar

ise,

int

rinsi

c sa

fety

is

the

pref

erre

d te

chni

que

for

inst

rum

enta

tion

whe

re d

ust i

s th

e ha

zard

bec

ause

:•

the

inhe

rent

saf

ety

of in

trins

ic s

afet

y gi

ves

the

grea

test

as

sura

nce

of s

afet

y an

d re

mov

es c

once

rn o

ver o

verh

eatin

g

of e

quip

men

t and

cab

les

• th

e in

stal

latio

n ru

les

are

clea

rly s

peci

fied

and

the

syst

em

desi

gn e

nsur

es th

at a

ll sa

fety

asp

ects

are

cov

ered

• li

ve m

aint

enan

ce is

per

mitt

ed•

equ

ipm

ent i

s av

aila

ble

to s

olve

the

maj

ority

of p

robl

ems

The

prin

cipa

l rea

son

for

usin

g in

trin

sic

safe

ty

is

bec

ause

it is

ess

entia

lly a

low

pow

er t

echn

ique

, c

onse

quen

tly t

he r

isk

of ig

nitio

n is

min

imis

ed.

1819

Intr

insi

c sa

fety

(IS

) is

ola

tors

fo

r haza

rdous

are

a

inte

rfaci

ng

MTL

4500

/MTL

5500

SER

IES

The

DIN

-rail

mounting M

TL5

500 S

erie

s m

eets

the

need

s of

the

IS in

terfa

ce m

arke

t for

"ap

plic

atio

n fo

cuss

ed"

proj

ects,

ran

ging

fro

m s

ingl

e in

strum

ent

loop

s, th

roug

h to

fully

equ

ippe

d ca

bine

ts, a

cros

s al

l in

dustr

ies

whe

re h

azar

dous

are

as e

xist.

The

MTL

55

00 c

lips

quic

kly

ont

o D

IN r

ail,

so i

t is

com

patib

le w

ith t

he i

ndus

try-st

anda

rd m

ount

ing

syste

m.

Wiri

ng i

s si

mpl

ified

by

plug

-in s

afe-

and

ha

zard

ous-a

rea

conn

ecto

rs,

and

a po

wer

pl

ug

whi

ch a

ccep

ts a

pow

er b

us;

it al

l le

ads

to q

uick

er

inse

rtion

, fe

wer

wiri

ng e

rror

s an

d tro

uble

-free

, tid

ier

insta

llatio

ns.

Line

fault d

etec

tion (

LFD

) fa

cilit

ies

are

prov

ided

ac

ross

the

ran

ge o

f I/

O f

unct

ions

; on

the

sw

itch/

prox

imity

det

ecto

rs,

the

MTL

4523

/552

3 so

leno

id/

alar

m d

river

s an

d th

e is

olat

ing

driv

ers.

Ana

logu

e in

put u

nits

such

as

the

MTL

4541

/554

1 pr

ovid

e lin

e fa

ult d

etec

tion

by re

peat

ing

o/c

or s

/c c

urre

nts

to th

e sa

fe-a

rea

cont

rol s

yste

m.

Statu

s LE

Ds,

con

figur

atio

n sw

itche

s an

d po

rts

are

loca

ted

on th

e to

p or

sid

e of

indi

vidu

al m

odul

es,

as a

ppro

pria

te, f

or e

asy

acce

ss.

Both

new

se

ries

ha

ve

bee

n

des

igned

fo

r co

mpatiblit

y

with

earl

ier

model

s.

The

MTL

4500

se

ries

prov

ides

pl

ug-re

plac

emen

ts

for

earli

er M

TL40

00 s

erie

s un

its,

whi

le t

he M

TL55

00

mod

els

can

easi

ly r

epla

ce M

TL50

00 s

erie

s un

its.

Each

of

fer

the

late

st in

m

oder

n te

chno

logy

an

d ef

ficie

ncy

with

out c

ompr

omis

e.

MTL

's

late

st

gen

eration

of

IS

inte

rface

s ut

ilise

s an

in

nova

tive

"One

-Cor

e"

tech

nolo

gy

to

ensu

re

the

high

est

qual

ity

and

avai

labi

lity

whi

le

mai

ntai

ning

m

axim

um

flexi

bilit

y at

lo

wes

t co

st.

Inco

rpor

atin

g ad

vanc

ed c

ircui

t des

ign,

a c

omm

on s

et

of c

ompo

nent

s an

d in

nova

tive

isol

atin

g tra

nsfo

rmer

co

nstru

ctio

n,

they

ac

hiev

e a

sign

ifica

nt

redu

ctio

n in

po

wer

co

nsum

ptio

n w

hile

in

crea

sing

ch

anne

l pa

ckin

g de

nsiti

es.

The

com

pact

, 16

mm

wid

e de

sign

redu

ces

wei

ght a

nd g

ives

exc

eptio

nally

hig

h pa

ckin

g de

nsity

. Th

ey

build

on

th

e

prov

en

succ

ess

of

the

MTL

2000

, 30

00,

4000

and

500

0 Se

ries

to

brin

g th

e be

nefit

s of

new

dev

elop

men

ts in

gal

vani

c is

olat

ion

with

out

com

prom

isin

g th

e re

liabi

lity

of t

he

desi

gns

from

whi

ch th

ey h

ave

evol

ved.

The

back

pla

ne

mounting M

TL45

00 S

erie

s is

de

sign

ed w

ith s

yste

m v

endo

rs i

n m

ind

for

"pro

ject

-fo

cuss

ed"

appl

icat

ions

suc

h as

Dis

tribu

ted

Con

trol

Syste

m (

DC

S),

Emer

genc

y Sh

utdo

wn

Syste

ms

(ESD

) an

d Fi

re a

nd G

as m

onito

ring

(F&

G).

The

red

uce

d

pow

er

consu

mp

tio

n

and

hig

h e

ffic

iency

ena

ble

high

sig

nal d

ensi

ty t

o be

ac

hiev

ed to

geth

er w

ith im

prov

ed fr

eedo

m in

cab

inet

la

yout

and

des

ign.

Eas

y in

tegr

atio

n w

ith th

e in

put/

outp

ut a

ssem

blie

s of c

ontro

l or s

afet

y in

stru

men

tatio

n sy

stem

s no

t on

ly s

impl

ifies

pro

ject

eng

inee

ring

but

also

red

uces

inst

alla

tion

and

mai

nten

ance

cos

ts.

A m

ultiw

ay

conn

ecto

r to

the

back

plan

e pr

ovid

es

safe

-are

a an

d po

wer

su

pply

co

nnec

tions

, w

hile

ha

zard

ous-a

rea

conn

ectio

ns p

lug

into

the

front

of t

he

mod

ule,

sim

plifi

ng i

nsta

llatio

n an

d m

aint

enan

ce a

nd

redu

cing

tim

e, c

ost,

and

the

risk

of e

rror

s.

•

Multi-

channel

I/O

module

s•

Bro

ken

lin

e and e

art

h-f

ault

pro

tect

ion

•

Com

patible

with p

rece

din

g M

TL

isola

tor

seri

es f

or

plu

ggable

re

pla

cem

ents

•

3-p

ort

iso

lation a

s st

andard

•

Hig

hes

t m

odule

/channel

pack

ing d

ensi

ties

•

Low

pow

er d

issi

pation

•

Quic

k inst

all

and r

elea

se

mec

hanis

m

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

Inte

rnat

iona

l

Euro

pe

N.Am

eric

a

IECE

x

ATEX

(Bas

eefa

)

FM

FM (C

anad

a)CS

A

ATEX

Cat

3FM

FM

(Can

ada)

CSA

EN60

079-

15FM

3611

CA

N/CS

A E6

0079

-15

C22.

2 No

.213

Base

efa

MTL

IEC6

1508

IEC6

0079

-0IE

C600

79-1

1IE

C612

41-1

1

EN60

079-

0EN

6007

9-11

EN61

241-

11

FM36

00, 3

610,

381

0

C22.

2 No

.157

Intri

nsic

saf

ety

Zone

2, D

iv2

mou

nt

Func

tiona

l saf

ety

Intri

nsic

Saf

ety

Inte

rfaci

ngM

TL p

rovi

des

two

sim

ple

mea

ns o

f co

nnec

ting

inst

rum

ent

loop

s in

to h

azar

dous

are

as o

f pr

oces

s pl

ant

usin

g ze

ner

barr

iers

or

isol

ator

s.

•

Zene

r Bar

riers

- in

dust

ry s

tand

ards

for m

ore

than

30

year

s.

Our r

ange

of s

hunt

-dio

de s

afet

y ba

rrie

rs a

re th

e si

mpl

est t

ype

of IS

inte

rface

for p

rote

ctin

g el

ectri

cal c

ircui

ts in

haz

ardo

us a

reas

. Th

e co

mpa

ct a

nd in

expe

nsiv

e un

its a

re m

ount

ed a

nd e

arth

ed in

one

ope

ratio

n, e

nsur

ing

the

safe

st p

ossi

ble

inst

alla

tion

with

ultr

a-hi

gh re

liabi

lity.

•

Intri

nsic

ally

saf

e is

olat

ing

inte

rface

s fo

r eve

ry a

pplic

atio

n

MTL

iso

latin

g in

terfa

ces

are

alte

rnat

ives

to

shun

t-di

ode

safe

ty b

arrie

rs f

or p

rote

ctin

g el

ectri

cal

circ

uits

in

haza

rdou

s ar

eas.

Th

ey n

eed

no h

igh-

inte

grity

ear

th a

nd p

rovi

de e

xtra

feat

ures

suc

h as

sig

nal a

mpl

ifica

tion

and

rela

y fu

nctio

ns. T

he is

olat

ion

of

haza

rdou

s- a

nd s

afe-

area

circ

uits

allo

ws

each

to b

e ea

rthed

at a

ny c

onve

nien

t poi

nt, s

impl

ifyin

g in

stal

latio

n an

d av

oidi

ng e

arth

-lo

op p

robl

ems.

MTL

offe

rs th

e be

st c

hoic

e in

DIN

-rai

l and

bac

kpla

ne m

ount

ing

isol

ator

s to

mee

t the

requ

irem

ents

of m

oder

n co

ntro

l int

erfa

cing

sy

stem

s. T

he D

IN-r

ail m

ount

ing

isol

ator

ran

ges

prov

ide

a w

ide

choi

ce o

f fu

nctio

ns w

ith h

igh

accu

racy

and

rel

iabi

lity,

whi

le

the

back

plan

e m

ount

ing

prod

ucts

are

est

ablis

hed

as t

he le

adin

g IS

sys

tem

inte

rface

with

sol

utio

ns f

or a

ll th

e m

ajor

DCS

co

mpa

nies

.

The

MTL

4500

Ser

ies

is t

he l

ates

t ge

nera

tion

of b

ackp

lane

mou

ntin

g pr

oduc

ts,

build

ing

upon

the

her

itage

of

MTL

4000

and

in

trodu

cing

man

y ke

y ap

plic

atio

n be

nefit

s. T

he M

TL55

00 S

erie

s la

unch

es a

new

indu

stry

sta

ndar

d fo

r DIN

rail

mou

ntin

g pr

oduc

ts,

idea

lly s

uite

d to

a w

ide

varie

ty o

f int

erfa

ce ta

sks

for p

roce

ss in

stru

men

tatio

n, c

ompl

emen

ted

by th

e w

ell p

rove

n M

TL50

00 S

erie

s.

In m

ost a

pplic

atio

ns M

TL45

00 m

odul

es c

an d

irect

ly r

epla

ce M

TL40

00 m

odel

s bu

t che

ck w

ith M

TL if

you

hav

e an

y co

ncer

ns. S

imila

rly, M

TL55

00 s

uppl

ants

MTL

5000

Ser

ies

as th

e DI

N ra

il in

terfa

ce fa

mily

of c

hoic

e. W

ith th

is m

ount

ing

arra

ngem

ent,

it is

pra

ctic

al fo

r mod

els

from

bot

h fa

mili

es to

be

used

alo

ngsi

de e

ach

othe

r dur

ing

the

trans

ition

pha

se

from

the

old

rang

e to

the

new

.

Visi

t the

MTL

web

site

, ww

w.m

tl-in

st.c

om, w

here

you

will

find

the

late

st v

ersi

on o

f any

of t

he m

ater

ial g

iven

her

e to

geth

er w

ith re

leva

nt c

ertifi

catio

n de

tails

and

app

licat

ion

info

rmat

ion.

2021

Back

plan

eDe

vice

MTL

4501

-SR

MTL

4504

MTL

4510

MTL

4510

B

MTL

4511

MTL

4513

MTL

4514

MTL

4516

MTL

4516

C

MTL

4517

DIN-

rail

Devi

ce

MTL

5501

-SR

MTL

5510

MTL

5510

B

MTL

5511

MTL

5513

MTL

5514

MTL

5516

C

MTL

5517

No. o

f ch

anne

ls

1 1 4 4 1 2 1 2 2 2

Impo

rtant

feat

ures

Safe

ty re

late

d, S

IL3

switc

h/pr

ox in

put,

phas

e re

vers

al +

LFD

Can

switc

h +

ve o

r -ve

pol

arity

sig

nals

Mul

ti-fu

nctio

n se

lect

able

Switc

h/pr

oxim

ity d

etec

tor r

epea

ter

dc to

1kH

z fre

quen

cy re

spon

se

Switc

h/pr

oxim

ity d

etec

tor r

epea

ter

Inde

pend

ent L

FD o

utpu

t

Switc

h/pr

oxim

ity d

etec

tor r

epea

ter

Switc

h/pr

oxim

ity d

etec

tor r

epea

ter

Switc

h/pr

oxim

ity d

etec

tor r

epea

ter

Inde

pend

ent L

FD o

utpu

t

Outp

ut to

safe

are

a

24V

logi

c

Rela

ys1

x SP

DT1

x SP

DT

4 x

solid

sta

te

4 x

solid

sta

te

Rela

y1

x SP

DT

2 x

solid

sta

te

Rela

ys1

x SP

DT

1 x

SPDT

Rela

ys2

x SP

ST

Rela

ys2

x SP

DT

Rela

ys2

x SP

ST

1 x

SPST

DIGI

TAL

INPU

T -

SWIT

CHES

/ PR

OXIM

ITY

DETE

CTOR

S

Isol

ator

App

licat

ions

:

ISO

LAT

OR

FU

NC

TIO

N S

EL

EC

TO

R

Tem

per

atu

re I

nput

MTL

4575

MTL

5575

1te

mpe

ratu

re c

onve

rter,

THC

or

RTD

MTL

4576

-RTD

MTL

5576

-RTD

2te

mpe

ratu

re c

onve

rter,

RTD

MTL

4576

-TH

CM

TL55

76-T

HC

2te

mpe

ratu

re c

onve

rter,

THC

Gen

eral

MTL

4599

MTL

5599

–du

mm

y m

odul

e

MTL

4599

N

––

gene

ral p

urpo

se fe

ed-th

roug

h m

odul

e

Fire

& S

mok

eM

TL45

61M

TL55

612

loop

-pow

ered

, for

fire

and

sm

oke

dete

ctor

s

Back

pla

ne

MTL

45

00

DIN

-rail

MTL

55

00

Channel

sFu

nct

ion

MTL

4531

MTL

5531

1vi

brat

ion

prob

e in

terfa

ce

MTL

4532

MTL

5532

1pu

lse is

olat

or, d

igita

l or

anal

ogue

out

put

MTL

4533

MTL

5533

2vi

brat

ion

prob

e in

terfa

ce

Puls

e &

Vib

ration

MTL

4541

MTL

5541

12/

3 w

ire tr

ansm

itter

rep

eate

r

MTL

4541

AM

TL55

41A

1tra

nsm

itter

rep

eate

r, pa

ssiv

e in

put

MTL

4541

AS

MTL

5541

AS

1tra

nsm

itter

rep

eate

r, pa

ssiv

e in

put,

curr

ent s

ink

MTL

4541

SM

TL55

41S

12/

3 w

ire tr

ansm

itter

rep

eate

r, cu

rren

t sin

k

MTL

4544

MTL

5544

22/

3 w

ire tr

ansm

itter

rep

eate

r

MTL

4544

AM

TL55

44A

2tra

nsm

itter

rep

eate

r, pa

ssiv

e in

put

MTL

4544

AS

MTL

5544

AS

2tra

nsm

itter

rep

eate

r, pa

ssiv

e in

put,

curr

ent s

ink

MTL

4544

SM

TL55

44S

22/

3 w

ire tr

ansm

itter

rep

eate

r, cu

rren

t sin

k

MTL

4544

DM

TL55

44D

12/

3 w

ire tr

ansm

itter

rep

eate

r, du

al o

utpu

t

Analo

gue

Input

MTL

4546

�

�

MTL

5546

14-

20m

A s

mar

t iso

latin

g dr

iver

+ L

FD

MTL

4546

C

–1

4-20

mA

sm

art i

sola

ting

driv

er +

oc

LFD

MTL

4546

YM

TL55

46Y

14-

20m

A s

mar

t iso

latin

g dr

iver

+ o

c LF

D

MTL

4549

MTL

5549

24-

20m

A s

mar

t iso

latin

g dr

iver

+ L

FD

MTL

4549

C

–2

4-20

mA

sm

art i

sola

ting

driv

er +

oc

LFD

MTL

4549

YM

TL55

49Y

24-

20m

A s

mar

t iso

latin

g dr

iver

+ o

c LF

D

Analo

gue

Outp

ut

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

2223

Dig

ital In

put

MTL

4501

-SR

MTL

5501

-SR

1fa

il-sa

fe s

olid

-stat

e ou

tput

+ L

FD a

larm

MTL

4504

–

1sw

itch/

prox

inpu

t, ph

ase

reve

rsal

+ L

FD

MTL

4510

MTL

5510

4sw

itch/

prox

inpu

t, so

lid-st

ate

outp

ut

MTL

4510

BM

TL55

10B

4m

ulti-

func

tion

switc

h/pr

ox in

put,

solid

-stat

e ou

tput

MTL

4511

MTL

5511

1sw

itch/

prox

inpu

t, c/

o re

lay

outp

ut

MTL

4513

MTL

5513

2sw

itch/

prox

inpu

t, so

lid-st

ate

outp

ut

MTL

4514

MTL

5514

1sw

itch/

prox

inpu

t, re

lay

+ LF

D

MTL

4516

–

2sw

itch/

prox

inpu

t, re

lay

+ LF

D o

utpu

ts

MTL

4516

CM

TL55

16C

2sw

itch/

prox

inpu

t, c/

o re

lay

+ LF

D o

utpu

ts

MTL

4517

MTL

5517

2sw

itch/

prox

inpu

t, re

lay

+ LF

D o

utpu

ts

Dig

ital O

utp

ut

MTL

4521

MTL

5521

1lo

op p

ower

ed s

olen

oid

driv

er

MTL

4521

L

–1

low

pow

er o

utpu

t, lo

op p

ower

ed II

C g

as g

roup

s

–M

TL55

221

loop

pow

ered

sol

enoi

d dr

iver

, IIB

MTL

4523

MTL

5523

1so

leno

id d

river

with

LFD

MTL

4523

L

–1

loop

pow

ered

sol

enoi

d dr

iver

with

LFD

MTL

4523

R

–1

sole

noid

driv

er w

ith r

ever

se L

FD

MTL

4524

MTL

5524

1sw

itch

oper

ated

sol

enoi

d dr

iver

MTL

4524

S

–1

switc

h op

erat

ed s

olen

oid

driv

er, 2

4V o

verr

ide

MTL

4525

MTL

5525

1sw

itch

oper

ated

sol

enoi

d dr

iver

, low

pow

er

MTL

4526

MTL

5526

2sw

itch

oper

ated

rel

ay

MT

L45

01-S

R –

MT

L55

01-S

R

FAIL

-SA

FE S

WIT

CH

/PR

OX

IMIT

Y-

DE

TE

CT

OR

IN

TE

RFA

CE

wit

h L

FD

With

th

e M

TLx5

01-S

R,

a fa

il-sa

fe

switc

h/pr

oxim

ity

dete

ctor

lo

cate

d in

th

e ha

zard

ous

area

ca

n co

ntro

l an

is

olat

ed

fail-

safe

el

ectro

nic

outp

ut. T

he M

TLx5

01-S

R al

so p

rovi

des

rela

y al

arm

con

tact

s to

si

gnal

lin

e-fa

ult

cond

ition

s.

The

MTL

x501

-SR

is

for

use

with

ap

prov

ed f

ail-s

afe

sens

ors

in lo

ops

that

req

uire

ope

ratio

n up

to S

IL3

acco

rdin

g to

the

func

tiona

l saf

ety

stand

ard

IEC

615

08.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f sw

itch

esZo

ne 0

, IIC

, T6

haza

rdou

s ar

eaD

iv. 1

, Gro

up A

haz

ardo

us lo

catio

nLo

cation o

f pro

xim

ity d

etec

tor

Zone

0, I

IC, T

4–6,

haz

ardo

us lo

catio

nD

iv 1

, Gro

up A

, haz

ardo

us lo

catio

nV

oltage

applie

d t

o s

enso

r8.

6V d

c m

ax fr

om 1

kIn

put/

outp

ut

chara

cter

istics

Input

valu

e in

se

nso

r ci

rcuits

Fail–

safe

outp

ut

Oper

ation

LFD

co

nta

cts

2.9m

A <

Is <

3.9

mA

ON

Nor

mal

CLO

SED

Is <

1.9m

A &

Is >

5.1

mA

OFF

Nor

mal

CLO

SED

Is <

50μA

OFF

Brok

en li

neO

PEN

Rs <

100

OFF

Shor

ted

line

OPE

N

Not

e: Is

= s

enso

r cu

rren

t

Fail-

safe

ele

ctro

nic

outp

ut

Out

put o

n:

24V

nom

inal

Out

put o

ff:

0V d

c, m

ax <

5V

dcLo

ad:

750

to 1

0kM

axim

um o

n-sta

te c

urre

nt: 2

5mA

(at 7

50)

Shor

t-circ

uit c

urre

nt: 3

0mA

Line

fault d

etec

tion (

LFD

)LF

D r

elay

out

put:

cont

acts

open

whe

n lin

e fa

ult d

etec

ted

Switc

h ch

arac

teris

tics:

0.3A

110

V ac

/dc;

1A

35V

dc;

30W

/33V

ASa

fety

inte

gri

ty lev

el (

SIL)

Hig

hest

leve

l in

sing

le in

-line

sub

syste

m

SIL3

(in

acc

orda

nce

with

IEC

6150

8-2)

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rdous

are

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indic

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er in

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Yello

w: c

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el s

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s, o

n w

hen

fail-

safe

out

put e

nerg

ised

Red:

LFD

indi

catio

n, fl

ashi

ng w

hen

line

faul

t det

ecte

dPow

er r

equir

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ts,

Vs

@ S

uppl

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ltage

750

load

typ.

load

20V

dc10

0mA

70m

A24

V dc

90m

A60

mA

35V

dc65

mA

45m

A

Pow

er d

issi

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ithin

unit

@ S

uppl

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ltage

750

load

typ.

load

20V

dc12

32m

W11

60m

W24

V dc

1392

mW

1200

mW

35V

dc15

07m

W13

35m

WSa

fety

des

crip

tion

Uo

= ±9

.7V,

Io =

30m

A, P

o =

0.07

W, C

i = 0

nF, L

i = 0

mH

Um

= 2

53V

Not

e: s

witc

h-ty

pe s

enso

rs m

ust b

e fit

ted

with

res

isto

rs a

s sh

own

MTL

55

01-S

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MTL

45

01-S

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LFD

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ever

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The

MTL

4504

ena

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a s

afe–

area

load

to b

e co

ntro

lled,

thro

ugh

a re

lay,

by

a pr

oxim

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etec

tor o

r sw

itch

loca

ted

in a

haz

ardo

us a

rea.

Lin

e fa

ults

are

sig

nalle

d th

roug

h a

sepa

rate

rel

ay a

nd i

ndic

ated

on

the

top

of th

e m

odul

e. M

TBF

info

rmat

ion

for t

he L

FD re

lay

is a

vaila

ble

from

MTL

to a

llow

the

failu

re r

ate

for

the

LFD

rel

ay to

be

calc

ulat

ed

whe

n us

ed in

the

criti

cal p

ath

with

the

outp

ut r

elay

for

saf

ety

criti

cal

appl

icat

ions

. Sw

itche

s ar

e pr

ovid

ed t

o se

lect

pha

se r

ever

sal a

nd t

o en

able

the

line

faul

t det

ectio

n.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f sw

itch

Zone

0, I

IC, T

6 ha

zard

ous

area

Div.

1, G

roup

A, h

azar

dous

loca

tion

Loca

tion o

f pro

xim

ity d

etec

tor

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea, i

f sui

tabl

y ce

rtifie

dD

iv.1,

Gro

up A

, haz

ardo

us lo

catio

nH

aza

rdous–

are

a inputs

Inpu

ts co

nfor

min

g to

BS

EN60

947–

5–6:

2001

sta

ndar

ds fo

r pr

oxim

ity d

etec

tors

(NA

MU

R)V

oltage

applie

d t

o s

enso

r7

to 9

V dc

from

1k

±10

%In

put/

outp

ut

chara

cter

istics

Nor

mal

pha

se

Out

puts

clos

ed if

inpu

t > 2

.1m

A (<

2k

in in

put c

ircui

t)

Out

puts

open

if in

put <

1.2

mA

(> 1

0kin

inpu

t circ

uit)

Hys

tere

sis:

200

μA (6

50) n

omin

alLi

ne

fault d

etec

tion (

LFD

) (

when

sel

ecte

d)

Use

r-sel

ecta

ble

via

switc

hes

on th

e si

de o

f the

uni

t. Lin

e fa

ults

are

indi

cate

d by

an

LED

. Lin

e fa

ult r

elay

is d

e-en

ergi

sed

and

chan

nel o

utpu

t rel

ay d

e-en

ergi

sed

if in

put l

ine-

faul

t det

ecte

dO

pen-

circ

uit a

larm

on

if I in

< 5

0μA

Ope

n-ci

rcui

t ala

rm o

ff if

I in >

250

μASh

ort-c

ircui

t ala

rm o

n if

R in <

100

Shor

t-circ

uit a

larm

off

if R in

> 3

60N

ote:

Res

isto

rs m

ust b

e fit

ted

whe

n us

ing

the

LFD

faci

lity

with

a c

onta

ct

inpu

t 50

0 to

1k

in s

erie

s w

ith s

witc

h20

k to

25k

in p

aral

lel w

ith s

witc

hSa

fe-a

rea o

utp

ut

Cha

nnel

: Si

ngle

pol

e re

lay

with

cha

ngeo

ver

cont

acts

LFD

: Si

ngle

pol

e re

lay

with

cha

ngeo

ver

cont

acts

N

ote:

rea

ctiv

e lo

ads

mus

t be

adeq

uate

ly s

uppr

esse

dRel

ay c

hara

cter

istics

Resp

onse

tim

e:

10m

s m

axim

umC

onta

ct r

atin

g:

10W

, 0.5

A, 3

5V d

c

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: c

hann

el s

tatu

s, o

n w

hen

outp

ut e

nerg

ised

Red:

LFD

indi

catio

n, o

n w

hen

line

faul

t det

ecte

dM

ax

imum

curr

ent

consu

mption

25m

A a

t 24V

dc

Pow

er d

issi

pation w

ithin

unit

0.6W

at 2

4VSa

fety

des

crip

tion

V o=10

.5V

I o=

14m

A

P o=37

mW

U

m =

253

V rm

s or

dc

SIL

capable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

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MT

L55

10

SWIT

CH

/PR

OX

IMIT

Y

DE

TE

CT

OR

IN

TE

RFA

CE

four

-cha

nnel

, dig

ital

inp

ut

The

MTL

x510

ena

bles

fou

r so

lid-st

ate

outp

uts

in th

e sa

fe a

rea

to b

e co

ntro

lled

by u

p to

fou

r sw

itche

s or

pro

xim

ity d

etec

tors

loca

ted

in a

ha

zard

ous

area

. Ea

ch p

air

of o

utpu

t tra

nsis

tors

sha

res

a co

mm

on

term

inal

and

can

sw

itch

+ve

or –

ve p

olar

ity s

igna

ls. A

ran

ge o

f m

odul

e co

nfig

urat

ions

is

avai

labl

e (s

ee T

able

1)

thro

ugh

the

use

of

sele

ctor

sw

itche

s. W

hen

prox

imity

det

ecto

r m

odes

are

sel

ecte

d, L

FD

is e

nabl

ed a

nd th

e ou

tput

sw

itche

s to

OFF

if a

line

faul

t is

dete

cted

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

s4,

con

figur

ed b

y sw

itche

sLo

cation o

f sw

itch

esZo

ne 0

, IIC

, T6

haza

rdou

s ar

eaD

iv 1

, Gro

up A

haz

ardo

us lo

catio

nLo

cation o

f pro

xim

ity d

etec

tors

Zone

0, I

IC, T

4-6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

dD

iv 1

, Gro

up A

, haz

ardo

us lo

catio

nH

aza

rdous-

are

a inputs

Inpu

ts co

nfor

min

g to

BS

EN60

947–

5–6:

2001

sta

ndar

ds fo

r pr

oxim

ity d

etec

tors

(NA

MU

R)V

oltage

applie

d t

o s

enso

r7

to 9

V dc

from

1k

±10

%In

put/

outp

ut

chara

cter

istics

Nor

mal

pha

se

Out

puts

clos

ed if

inpu

t > 2

.1m

A (<

2k

in in

put c

ircui

t)

Out

puts

open

if in

put <

1.2

mA

(> 1

0kin

inpu

t circ

uit)

Hys

tere

sis:

200

μA (6

50) n

omin

alLi

ne

fault d

etec

tion (

LFD

) (

when

sel

ecte

d)

Use

r-sel

ecta

ble

via

switc

hes

on th

e si

de o

f the

uni

t. O

pen-

circ

uit a

larm

on

if Iin

< 5

0μA

Ope

n-ci

rcui

t ala

rm o

ff if

Iin >

250

μASh

ort-c

ircui

t ala

rm o

n if

Rin

< 10

0Sh

ort-c

ircui

t ala

rm o

ff if

Rin

> 36

0N

ote:

Res

istor

s m

ust b

e fit

ted

whe

n us

ing

the

LFD

faci

lity

with

a c

onta

ct in

put

500

to 1

k in

ser

ies

with

sw

itch

20k

to 2

5k in

par

alle

l with

sw

itch

Safe

-are

a o

utp

uts

Fl

oatin

g so

lid-st

ate

outp

uts

com

patib

le w

ith lo

gic

circ

uits

Ope

ratin

g fre

quen

cy:

dc to

500

Hz

Max

. off-

state

vol

tage

: ±

35V

Max

. off-

state

leak

age

curr

ent:

± 50

μAM

ax. o

n-sta

te r

esis

tanc

e:

25M

ax. o

n-sta

te c

urre

nt:

± 50

mA

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: f

our:

on w

hen

outp

ut a

ctiv

eRe

d: L

FD in

dica

tion

+ fa

ulty

cha

nnel

’s ye

llow

LED

flas

hes

Max

imum

curr

ent

consu

mption

40m

A a

t 24V

(with

all

outp

ut c

hann

els

ener

gise

d)Pow

er d

issi

pation w

ithin

unit

0.96

W a

t 24V

, with

10m

A lo

ads

Safe

ty d

escr

iption (

each

channel

)V o

=10.

5V

Io=1

4mA

Po

=37m

W

Um =

253

V rm

s or

dc

Table

1 -

Mode

options

MO

DE

o/p

1o/

p 2

o/p

3o/

p 4

i/p

type

0ch

Ach

Bch

Cch

D

switc

h

1ch

A re

v.ch

Bch

Cch

D2

chA

chB

rev.

chC

chD

3ch

Ach

Bch

C re

v.ch

D4

chA

chB

chC

chD

rev.

5ch

A re

v.ch

B ch

C re

v.ch

D6

chA

chB

rev.

chC

chD

rev.

7ch

A re

v.ch

B re

v.ch

C re

v.ch

D re

v.8

chA

chB

chC

chD

prox

. de

tect

or

+ LF

D

9ch

A re

v.ch

Bch

Cch

D10

chA

chB

rev.

chC

chD

11ch

Ach

Bch

C re

v.ch

D12

chA

chB

chC

chD

rev.

13ch

A re

v.ch

B ch

C re

v.ch

D14

chA

chB

rev.

chC

chD

rev.

15ch

A re

v.ch

B re

v.ch

C re

v.ch

D re

v.

See

Instr

uctio

n M

anua

l IN

M45

00 fo

r fu

rther

mod

e in

form

atio

n.

2627

MT

L45

10B

– M

TL

5510

B

SWIT

CH

/PR

OX

IMIT

Y

DE

TE

CT

OR

IN

TE

RFA

CE

four

-cha

nnel

, mul

ti-f

unct

ion,

dig

ital

inp

ut

The

MTL

4510

B en

able

s fo

ur s

olid

-stat

e ou

tput

s in

the

saf

e ar

ea t

o be

con

trolle

d by

up

to fo

ur s

witc

hes

or p

roxi

mity

det

ecto

rs lo

cate

d in

a

haza

rdou

s ar

ea.

Each

pai

r of

out

put t

rans

isto

rs s

hare

s a

com

mon

te

rmin

al a

nd c

an s

witc

h +v

e or

–ve

pol

arity

sig

nals.

A r

ange

of

mod

ule

conf

igur

atio

ns i

s av

aila

ble

(see

Tab

le 1

) th

roug

h th

e us

e of

se

lect

or s

witc

hes.

The

se in

clud

e sta

rt/sto

p op

erat

ions

and

pul

se o

utpu

t m

odes

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

s4,

con

figur

ed b

y sw

itche

sLo

cation o

f sw

itch

esZo

ne 0

, IIC

, T6

haza

rdou

s ar

eaD

iv 1

, Gro

up A

haz

ardo

us lo

catio

nLo

cation o

f pro

xim

ity d

etec

tors

Zone

0, I

IC, T

4-6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

dD

iv 1

, Gro

up A

, haz

ardo

us lo

catio

nH

aza

rdous-

are

a inputs

Inpu

ts co

nfor

min

g to

BS

EN60

947–

5–6:

2001

sta

ndar

ds fo

r pr

oxim

ity d

etec

tors

(NA

MU

R)V

oltage

applie

d t

o s

enso

r7

to 9

V dc

from

1k

±10

%In

put/

outp

ut

chara

cter

istics

Nor

mal

pha

se

Out

puts

clos

ed if

inpu

t > 2

.1m

A (<

2k

in in

put c

ircui

t)

Out

puts

open

if in

put <

1.2

mA

(> 1

0kin

inpu

t circ

uit)

Hys

tere

sis:

200

μA (6

50) n

omin

alLi

ne

fault d

etec

tion (

LFD

) (

when

sel

ecte

d)

Use

r-sel

ecta

ble

via

switc

hes

on th

e si

de o

f the

uni

t. O

pen-

circ

uit a

larm

on

if Iin

< 5

0μA

Ope

n-ci

rcui

t ala

rm o

ff if

Iin >

250

μASh

ort-c

ircui

t ala

rm o

n if

Rin

< 10

0Sh

ort-c

ircui

t ala

rm o

ff if

Rin

> 36

0N

ote:

Res

istor

s m

ust b

e fit

ted

whe

n us

ing

the

LFD

faci

lity

with

a c

onta

ct in

put

500

to 1

k in

ser

ies

with

sw

itch

20k

to 2

5k in

par

alle

l with

sw

itch

Safe

-are

a o

utp

uts

Fl

oatin

g so

lid-st

ate

outp

uts

com

patib

le w

ith lo

gic

circ

uits

Ope

ratin

g fre

quen

cy:

dc to

500

Hz

Max

. off-

state

vol

tage

: ±

35V

Max

. off-

state

leak

age

curr

ent:

± 50

μAM

ax. o

n-sta

te r

esis

tanc

e:

25M

ax. o

n-sta

te c

urre

nt:

± 50

mA

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: f

our:

on w

hen

outp

ut a

ctiv

eRe

d: L

FD in

dica

tion

+ fa

ulty

cha

nnel

’s ye

llow

LED

flas

hes

M

ax

imum

curr

ent

consu

mption

40m

A a

t 24V

(with

all

outp

ut c

hann

els

ener

gise

d)Pow

er d

issi

pation w

ithin

unit

0.96

W a

t 24V

, with

10m

A lo

ads

Safe

ty d

escr

iption (

each

channel

)V o

=10.

5V

Io=1

4mA

Po

=37m

W

Um =

253

V rm

s or

dc

Table

1 -

Mode

options

MO

DE

Funct

ion

Equi

vale

nt*

04

-ch

switc

h in

put,

MTL

x510

12-

ch e

ach

chan

nel o

ne in

put,

two

outp

uts

MTL

4016

2Sa

me

as m

ode

1 w

ith p

hase

reve

rsed

MTL

4016

32-

ch, 2

-pol

e ch

ange

over

out

put

41-

ch w

ith li

ne fa

ult o

utpu

t M

TLx0

145

As

mod

e 4

with

cha

ngeo

ver

outp

uts

61-

ch w

ith s

tart-

stop

latc

h M

TL22

10B

74-

ch s

witc

h in

put,

MTL

x510

84-

ch s

witc

h in

put,

MTL

x510

92-

ch w

ith li

ne fa

ult o

utpu

t M

TLx0

1710

As

mod

e 9

with

LFD

cha

ngeo

ver

11A

s m

ode

10 w

ith p

hase

rev

erse

d12

3-ch

with

nor

mal

ly-o

pen

LFD

out

put

133-

ch w

ith n

orm

ally

-clo

sed

LFD

out

put

142-

ch m

onos

tabl

e, p

ulse

stre

tche

r15

4-ch

sw

itch

inpu

t M

TLx5

10

* N

ote

that

term

inal

con

nect

ions

may

not

be

the

sam

e on

thes

e m

odel

s,

a

nd x

can

mea

n ei

ther

'4' o

r '5

'.

See

Instr

uctio

n M

anua

l IN

M45

00 fo

r fu

rther

mod

e in

form

atio

n.

Haza

rdous

are

aSa

fe a

rea

1$2

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1$1

1$3

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MTL

55

10B

MTL

45

10B

Haza

rdous

are

aSa

fe a

rea

1$2

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1$1

1$3

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The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

MT

L45

11 –

MT

L55

11

SWIT

CH

/ P

RO

XIM

ITY

D

ET

EC

TO

R I

NT

ER

FAC

Esi

ngle

cha

nnel

, wit

h lin

e fa

ult

dete

ctio

n

The

MTL

x511

ena

bles

a s

afe-

area

load

to b

e co

ntro

lled

by a

sw

itch

or

prox

imity

det

ecto

r loc

ated

in a

haz

ardo

us-a

rea.

Whe

n se

lect

ed, o

pen

or s

hort

circ

uit c

ondi

tions

in th

e fie

ld w

iring

are

det

ecte

d by

the

line-

faul

t-det

ect (

LFD

) fac

ility

and

also

indi

cate

d on

the

top

of th

e m

odul

e.

Phas

e re

vers

al fo

r the

cha

nnel

is s

elec

ted

by a

sw

itch

on th

e si

de o

f the

m

odul

e an

d ou

tput

is p

rovi

ded

by c

hang

eove

r re

lay

cont

acts.

SPEC

IFIC

ATI

ON

Se

e als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f sw

itch

esZo

ne 0

, IIC

, T6

haza

rdou

s ar

eaD

iv. 1

, Gro

up A

haz

ardo

us lo

catio

nLo

cation o

f pro

xim

ity d

etec

tor

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

dD

iv. 1

, Gro

up A

haz

ardo

us lo

catio

nH

aza

rdous-

are

a inputs

Inpu

ts co

nfor

min

g to

BS

EN60

947–

5–6:

2001

sta

ndar

ds fo

r pr

oxim

ity d

etec

tors

(NA

MU

R)V

oltage

applie

d t

o s

enso

r7

to 9

V dc

from

1k

±10

%In

put/

outp

ut

chara

cter

istics

Nor

mal

pha

se

Out

puts

clos

ed if

inpu

t >

2.1m

A (<

2k

in in

put c

ircui

t)

Out

puts

open

if in

put <

1.2

mA

(> 1

0kin

inpu

t circ

uit)

Hys

tere

sis:

200

A (6

50) n

omin

alLi

ne

fault d

etec

tion (

LFD

) (

when

sel

ecte

d)

Use

r-sel

ecta

ble

via

switc

hes

on th

e si

de o

f the

uni

t. A

line

faul

t is

indi

cate

d by

an

LED

. The

cha

nnel

out

put r

elay

is d

e-en

ergi

sed

if an

inpu

t lin

e fa

ult i

s de

tect

ed.

Ope

n-ci

rcui

t ala

rm o

n if

Iin <

50

AO

pen-

circ

uit a

larm

off

if Iin

> 2

50A

Shor

t-circ

uit a

larm

on

if Ri

n <

100

Shor

t-circ

uit a

larm

off

if Ri

n >

360

Not

e: R

esist

ors

mus

t be

fitte

d w

hen

usin

g th

e LF

D fa

cilit

y w

ith a

con

tact

inpu

t50

0 to

1k

in s

erie

s w

ith s

witc

h20

k to

25k

in p

aral

lel w

ith s

witc

hSa

fe-a

rea o

utp

ut

Sing

le p

ole

rela

y w

ith c

hang

eove

r co

ntac

tsN

ote:

rea

ctiv

e lo

ads

mus

t be

adeq

uate

ly s

uppr

esse

dRel

ay c

hara

cter

istics

MTL

45

11

MTL

55

11

Resp

onse

tim

e:10

ms

max

imum

10m

s m

axim

um

Con

tact

rat

ing:

10W

, 0.5

A,

35V

dc25

0V a

c, 2

A, c

osØ

>0.

7,

40V

dc, 2

A, r

esis

tive

load

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: c

hann

el s

tatu

s, o

n w

hen

outp

ut e

nerg

ised

Red:

LFD

indi

catio

n, o

n w

hen

line

faul

t det

ecte

dM

ax

imum

curr

ent

consu

mption

25m

A a

t 24V

Pow

er d

issi

pation w

ithin

unit

0.6W

at 2

4VSa

fety

des

crip

tion (

each

channel

)Vo

=10.

5V

Io=1

4mA

Po

=37m

W

Um =

253

V rm

s or

dc

SIL

capable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

Haza

rdous

are

aSa

fe a

rea

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MTL

55

11

MTL

45

11

Haza

rdous

are

aSa

fe a

rea

2829

The

MTL

x513

ena

bles

tw

o so

lid-st

ate

outp

uts

in t

he s

afe

area

to

be c

ontro

lled

by t

wo

switc

hes

or p

roxi

mity

det

ecto

rs l

ocat

ed i

n th

e ha

zard

ous

area

. Th

e C

h1/C

h2 o

utpu

t tra

nsis

tors

sha

re a

com

mon

te

rmin

al a

nd c

an s

witc

h +v

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arity

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ne fa

ult d

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hes

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catio

n is

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odul

e.

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IFIC

ATI

ON

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als

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mon s

pec

ific

ation

Num

ber

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oLo

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ne 0

, IIC

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rdou

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eaD

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up A

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ardo

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nLo

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xim

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etec

tors

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rdou

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aza

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ts co

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r pr

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mal

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se

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t > 2

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uit)

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sis:

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alLi

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etec

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nnel

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itche

s on

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ults

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cate

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nnel

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pen-

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ote:

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ust b

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ing

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ct in

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r pr

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MU

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se

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t circ

uit)

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tere

sis:

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alLi

ne

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etec

tion (

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sel

ecte

d)

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r-sel

ecta

ble

via

switc

hes

on th

e si

de o

f the

uni

t. Lin

e fa

ults

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cate

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e fa

ult r

elay

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nerg

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l out

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t lin

e-fa

ult d

etec

ted

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AO

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t ala

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g th

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D fa

cilit

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45

14

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55

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max

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um

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tact

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ing:

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A,

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load

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lug

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Z1-3

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er in

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line

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FD)

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ever

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pec

ific

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itch

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ne 0

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ts co

nfor

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sta

ndar

ds fo

r pr

oxim

ity d

etec

tors

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MU

R)V

oltage

applie

d t

o s

enso

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to 9

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%In

put/

outp

ut

chara

cter

istics

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mal

pha

se

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puts

clos

ed if

inpu

t > 2

.1m

A (<

2k

in in

put c

ircui

t)

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puts

open

if in

put <

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mA

(> 1

0kin

inpu

t circ

uit)

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tere

sis:

200

μA (6

50) n

omin

alLi

ne

fault d

etec

tion (

LFD

) (

when

sel

ecte

d)

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r-sel

ecta

ble

via

switc

hes

on th

e si

de o

f the

uni

t. Lin

e fa

ults

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indi

cate

d by

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each

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nnel

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cha

nnel

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put

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y is

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gise

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put l

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faul

t is

dete

cted

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pen-

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e fit

ted

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n us

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LFD

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lity

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onta

ct in

put

500

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k in

ser

ies

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itch

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-are

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ys w

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hang

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ntac

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rea

ctiv

e lo

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t be

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uate

ly s

uppr

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ay c

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cter

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TL45

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MTL

55

16C

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onse

tim

e:10

ms

max

imum

10m

s m

axim

um

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tact

rat

ing:

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, 0.5

A,

35V

dc25

0V a

c, 2

A, c

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7,

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dc, 2

A, r

esis

tive

load

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nal p

lug

HA

Z1-3

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equi

red

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acce

ss to

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tion

LED

indic

ato

rsG

reen

: pow

er in

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tion

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w: t

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nnel

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tus,

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ene

rgis

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o: L

FD in

dica

tion,

on

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n lin

e fa

ult d

etec

ted

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ent

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mption

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A a

t 24V

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er d

issi

pation w

ithin

unit

0.84

W a

t 24V

Safe

ty d

escr

iption (

each

channel

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=10.

5V

Io=1

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Po

=37m

W

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253

V rm

s or

dc

SIL

capable

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e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

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ite.

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16

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en d

ata

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nly

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crip

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ld n

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gal

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ranty

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her

tec

hnic

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evel

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ake

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ign

chan

ges

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55

16C

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imity

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lay

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cate

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top

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e m

odul

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witc

hes

are

prov

ided

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elec

t pha

se re

vers

al a

nd

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nabl

e th

e lin

e fa

ult d

etec

tion.

SPEC

IFIC

ATI

ON

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als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sTw

oLo

cation o

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itch

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0, I

IC, T

6 ha

zard

ous

area

Div.

1, G

roup

A, h

azar

dous

loca

tion

Loca

tion o

f pro

xim

ity d

etec

tor

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea, i

f sui

tabl

y ce

rtifie

dD

iv.1,

Gro

up A

, haz

ardo

us lo

catio

nH

aza

rdous-

are

a inputs

Inpu

ts co

nfor

min

g to

BS

EN60

947–

5–6:

2001

sta

ndar

ds fo

r pr

oxim

ity d

etec

tors

(NA

MU

R)V

oltage

applie

d t

o s

enso

r7

to 9

V dc

from

1k

±10

%In

put/

outp

ut

chara

cter

istics

Nor

mal

pha

se

Out

puts

clos

ed if

inpu

t > 2

.1m

A (<

2k

in in

put c

ircui

t)

Out

puts

open

if in

put <

1.2

mA

(> 1

0kin

inpu

t circ

uit)

Hys

tere

sis:

200

μA (6

50) n

omin

alLi

ne

fault d

etec

tion (

LFD

) (

when

sel

ecte

d)

Use

r se

lect

able

by

switc

hes

on th

e si

de o

f the

mod

ule.

LIn

e fa

ults

are

indi

cate

d by

the

LED

for

each

cha

nnel

.Lin

e fa

ult r

elay

is e

nerg

ised

and

cha

nnel

out

put r

elay

de

-ene

rgis

ed if

inpu

t lin

e-fa

ult d

etec

ted

Ope

n-ci

rcui

t ala

rm o

n if

I in <

50μ

AO

pen-

circ

uit a

larm

off

if I in

> 2

50μA

Shor

t-circ

uit a

larm

on

if R in

< 1

00Sh

ort-c

ircui

t ala

rm o

ff if

R in >

360

Not

e: R

esist

ors

mus

t be

fitte

d w

hen

usin

g th

e LF

D fa

cilit

y w

ith a

con

tact

inpu

t50

0 to

1k

in s

erie

s w

ith s

witc

h20

k to

25k

in p

aral

lel w

ith s

witc

hSa

fe-a

rea o

utp

ut

Cha

nnel

: Tw

o si

ngle

-pol

e re

lays

with

nor

mal

ly o

pen

cont

acts

LFD

: Si

ngle

pol

e re

lay

with

cha

ngeo

ver

cont

acts

Not

e: r

eact

ive

load

s m

ust b

e ad

equa

tely

sup

pres

sed

Rel

ay c

hara

cter

istics

MTL

45

17

MTL

55

17

Resp

onse

tim

e:10

ms

max

imum

10m

s m

axim

um

Con

tact

rat

ing:

10W

, 0.5

A,

35V

dc25

0V a

c, 2

A, c

osØ

>0.

7,

40V

dc, 2

A, r

esis

tive

load

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: t

wo:

cha

nnel

sta

tus,

on

whe

n ou

tput

ene

rgis

edRe

d: tw

o: L

FD in

dica

tion,

on

whe

n lin

e fa

ult d

etec

ted

Max

imum

curr

ent

consu

mption

35m

A a

t 24V

Pow

er d

issi

pation w

ithin

unit

0.84

W a

t 24V

Safe

ty d

escr

iption (

each

channel

)Vo

=10.

5V

Io=1

4mA

Po

=37m

W

Um =

253

V rm

s or

dc

SIL

capable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

Haza

rdous

are

aSa

fe a

rea

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55

17

MTL

45

17

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rdous

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Back

plan

eDe

vice

MTL

4521

MTL

4521

L

MTL

4523

MTL

4523

R

MTL

4523

L

MTL

4524

MTL

4524

S

MTL

4525

DIN-

rail

Devi

ce

MTL

5521

MTL

5522

MTL

5523

MTL

5524

MTL

5525

No. o

f ch

anne

ls

1 1 1 1 1 1 1 1

Impo

rtant

feat

ures

IIC g

as g

roup

s, lo

op p

ower

ed

Low

pow

er o

utpu

t, lo

op p

ower

edIIC

gas

gro

ups

IIB g

as g

roup

s, lo

op p

ower

ed

Inde

pend

ent L

FD o

utpu

t

Loop

pow

ered

, ind

epen

dent

LF

D ou

tput

Safe

ty o

verr

ide

feat

ure,

sep

arat

ely

pow

ered

Safe

ty o

verr

ide

feat

ure,

sep

arat

ely

pow

ered

over

ride,

low

pow

er o

utpu

t

Outp

ut to

haza

rdou

s ar

ea

12.8

V<Vo

<24

VIm

ax =

48m

A

10.3

V<Vo

<24

VIm

ax =

48m

A

9.9V

<Vo

<24

VIm

ax =

70m

A

12.8

V<Vo

<24

VIm

ax =

48m

A

12.8

V<Vo

<24

VIm

ax =

48m

A

12.8

V<Vo

<24

VIm

ax =

48m

A

12.8

V<Vo

<24

VIm

ax =

48m

A

7V<

Vo<

24V

Imax

= 4

8mA

DIGI

TAL

OUTP

UT -

ALA

RMS,

LED

’s, S

OLEN

OID

VALV

ES E

TC.

Back

plan

eDe

vice

MTL

4526

DIN-

rail

Devi

ce

MTL

5526

No. o

f ch

anne

ls

1 2

Impo

rtant

feat

ures

Safe

-are

a sw

itch

inpu

t, du

al o

utpu

tsDu

al s

afe-

area

sw

itch

inpu

ts

Outp

ut to

haza

rdou

s ar

ea

RELA

YS1x

DPDT

2xSP

DT

DIGI

TAL

OUTP

UT -

SW

ITCH

OUT

PUT

TO H

AZAR

DOUS

ARE

A

Isol

ator

App

licat

ions

:

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

3233

MT

L45

21/L

– M

TL

5521

SO

LE

NO

ID/

AL

AR

M D

RIV

ER

loop

-pow

ered

, IIC

The

MTL

x521

/L i

s a

loop

-pow

ered

mod

ule

whi

ch e

nabl

es a

dev

ice

loca

ted

in th

e ha

zard

ous

area

to b

e co

ntro

lled

from

the

safe

are

a. T

he

MTL

x521

can

driv

e a

certi

fied

intri

nsic

ally

saf

e lo

w-p

ower

load

, as

w

ell a

s no

n-en

ergy

-stor

ing

sim

ple

appa

ratu

s su

ch a

s an

LED

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f lo

ad

Zone

0, I

IC, T

4–-6

haz

ardo

us a

rea

if su

itabl

y ce

rtifie

dD

iv. 1

, Gro

up A

haz

ardo

us lo

catio

n

Min

imum

outp

ut

voltage

E

quiv

ale

nt

outp

ut

circ

uit

(MTL

x5

21)

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Min

imum

outp

ut

voltage

E

quiv

ale

nt

outp

ut

circ

uit

(MTL

45

21L)

Input

voltage

20 to

35V

dc

Haza

rdous-

are

a o

utp

ut

(MTL

x5

21)

Min

imum

out

put v

olta

ge:

12.8

V at

48m

AM

axim

um o

utpu

t vol

tage

: 24

V fro

m 1

80C

urre

nt li

mit:

48m

AH

aza

rdous-

are

a o

utp

ut

(MTL

45

21L)

Min

imum

out

put v

olta

ge:

10.3

V at

48m

AM

axim

um o

utpu

t vol

tage

: 24

V fro

m 2

32C

urre

nt li

mit:

48m

AO

utp

ut

ripple

< 0.

5% o

f max

imum

out

put,

peak

to p

eak

Res

ponse

tim

eO

utpu

t with

in 1

0% o

f fin

al v

alue

with

in 1

00m

s

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rYe

llow

: out

put s

tatu

s, o

n w

hen

outp

ut a

ctiv

eM

ax

imum

curr

ent

consu

mption

90m

A a

t 24V

Pow

er d

issi

pation w

ithin

unit

1.4W

at 2

4V

Safe

ty d

escr

iption (

MTL

x5

21)

Vo=2

5V

Io=1

47m

A

Po=0

.92W

U

m =

253

V rm

s or

dc

Safe

ty d

escr

iption (

MTL

45

21L)

Vo=

25V

Io

= 10

8mA

Po

= 0.

68W

U

m =

253

V rm

s or

dc

SIL

capable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

Haza

rdous

are

aSa

fe a

rea

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' ( )

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55

21

MTL

45

21 /

MTL

45

21L

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rdous

are

aSa

fe a

rea

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3435

MT

L55

22

SOL

EN

OID

/AL

AR

M D

RIV

ER

loop

-pow

ered

, IIB

The

MTL

5522

is

a lo

op-p

ower

ed m

odul

e w

hich

ena

bles

a d

evic

e lo

cate

d in

the

haz

ardo

us a

rea

to b

e co

ntro

lled

from

the

saf

e ar

ea.

The

MTL

5522

can

driv

e a

certi

fied

intri

nsic

ally

saf

e lo

w-p

ower

load

, as

wel

l as

non-

ener

gy-st

orin

g si

mpl

e ap

para

tus

such

as

an L

ED.

The

unit'

s in

put/

outp

ut is

olat

ion

allo

ws

the

cont

rol s

witc

h to

be

conn

ecte

d in

to e

ither

sid

e of

the

24V

dc s

uppl

y ci

rcui

t.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f lo

ad

Zone

0, I

IB, T

4–6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

dD

iv. 1

, Gro

up C

haz

ardo

us lo

catio

nM

inim

um

outp

ut

voltage

E

quiv

ale

nt

outp

ut

circ

uit

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�� ���

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1����%��� ��6' 3

Input

voltage

20 to

35V

dc

Haza

rdous-

are

a o

utp

ut

Min

imum

out

put v

olta

ge:

9.9V

at 7

0mA

Max

imum

out

put v

olta

ge:

24V

from

158

Cur

rent

lim

it:

70

mA

Outp

ut

ripple

< 0.

5% o

f max

imum

out

put,

peak

to p

eak

Res

ponse

tim

eO

utpu

t with

in 1

0% o

f fin

al v

alue

with

in 1

00m

s

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rYe

llow

: out

put s

tatu

s, o

n w

hen

outp

ut a

ctiv

eM

ax

imum

curr

ent

consu

mption

125m

A (t

yp.)

at 2

4V

Pow

er d

issi

pation w

ithin

unit

1.4W

at 2

4V

Safe

ty d

escr

iption

Vo=2

5V

Io=1

66m

A

Po=1

.04W

U

m =

253

V rm

s or

dc

SIL

capable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

Haza

rdous

are

aSa

fe a

rea

& � � � �

' ( )

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MTL

55

22

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

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����

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With

the

MTL

x523

int

erfa

ce,

an o

n/of

f de

vice

in

a ha

zard

ous

area

ca

n be

con

trolle

d by

a v

olt-f

ree

cont

act o

r log

ic s

igna

l in

the

safe

are

a.

It is

sui

tabl

e fo

r dr

ivin

g lo

ads

such

as

sole

noid

s. L

ine

faul

t det

ectio

n (L

FD),

whi

ch o

pera

tes

irres

pect

ive

of t

he o

utpu

t sta

te,

is s

igna

lled

by a

saf

e-ar

ea s

olid

-stat

e sw

itch

whi

ch d

e-en

ergi

ses

MTL

x523

, or

en

ergi

ses

MTL

4523

R, i

f a

field

line

is

open

or

shor

t–ci

rcui

ted.

Ear

th

faul

t de

tect

ion

can

be p

rovi

ded

by c

onne

ctin

g an

MTL

4220

ear

th

leak

age

dete

ctor

to te

rmin

al 3

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f lo

ad

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

dD

iv. 1

, Gro

up A

, haz

ardo

us lo

catio

nM

inim

um

outp

ut

voltage

E

quiv

ale

nt

outp

ut

circ

uit

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����

��

����

��4�� �%� �

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1����%��� ��6�( 3

Haza

rdous-

are

a o

utp

ut

Min

imum

out

put v

olta

ge:

12.8

V at

48m

AM

axim

um o

utpu

t vol

tage

: 24

V fro

m 1

80C

urre

nt li

mit:

48m

AO

utp

ut

ripple

< 0.

5% o

f max

imum

out

put,

peak

to p

eak

Contr

ol in

put

Suita

ble

for s

witc

h co

ntac

ts, a

n op

en c

olle

ctor

tran

sisto

r or l

ogic

driv

e(in

tern

al c

onta

ct w

ettin

g vo

ltage

12V

@ 0

.2m

A c

onta

ct c

lose

d.

Not

sui

tabl

e fo

r vo

ltage

con

trol v

ia s

erie

s di

ode)

Out

put t

urns

on

if in

put s

witc

h cl

osed

, tra

nsis

tor

on o

r

<

1.4V

app

lied

acro

ss c

ontro

l inp

ut 1

1 &

12

Out

put t

urns

off

if in

put s

witc

h op

en, t

rans

isto

r of

f or

> 4.

5V a

pplie

d ac

ross

con

trol i

nput

11

& 1

2Res

ponse

tim

eO

utpu

t with

in 1

0% o

f fin

al v

alue

with

in 1

00m

sLi

ne

fault d

etec

tion (

LFD

)O

pen

or s

hort

circ

uit i

n fie

ld c

ablin

g de

-ene

rgis

es s

olid

sta

te

line-

faul

t sig

nal.

LFD

tran

sisto

r is

sw

itche

d on

, pro

vide

d th

at th

e fie

ld c

ircui

t im

peda

nce

is >

55

and

< 6

k5.

Line

fault s

ignal ch

ara

cter

istics

Max

imum

off-

state

vol

tage

: 35V

Max

imum

off-

state

leak

age

curr

ent:

10μA

Max

imum

on-

state

vol

tage

dro

p: 2

VM

axim

um o

n-sta

te c

urre

nt: 5

0mA

MT

L45

23/R

– M

TL

5523

SO

LE

NO

ID/A

LA

RM

DR

IVE

Rw

ith

line

faul

t de

tect

ion,

IIC

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: o

utpu

t sta

tus,

on

whe

n ou

tput

act

ive

Red:

LFD

indi

catio

n, o

n w

hen

line

faul

t det

ecte

dM

ax

imum

curr

ent

consu

mption

100m

A a

t 24V

dc

Pow

er d

issi

pation w

ithin

unit

1.2W

with

typi

cal s

olen

oid

valv

e, o

utpu

t on

2.0W

wor

st ca

seSa

fety

des

crip

tion

V o=25

V

I o=14

7mA

P o=

919m

W

Um

= 2

53V

rms

or d

cSI

L ca

pable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

MTL

55

23

MTL

45

23/M

TL45

23R

3637

With

the

MTL

4523

L in

terfa

ce,

an o

n/of

f dev

ice

in a

haz

ardo

us a

rea

can

be c

ontro

lled

by a

vol

tage

sig

nal i

n th

e sa

fe a

rea.

It i

s su

itabl

e fo

r dr

ivin

g lo

ads

such

as

sole

noid

s. L

ine

faul

t det

ectio

n (L

FD),

whi

ch

oper

ates

whe

n th

e ou

tput

is

ener

gise

d, i

s si

gnal

led

by a

saf

e-ar

ea

solid

-stat

e sw

itch

whi

ch e

nerg

ises

if

a fie

ld l

ine

is o

pen

or s

hort-

circ

uite

d. E

arth

fau

lt de

tect

ion

can

be p

rovi

ded

by c

onne

ctin

g an

M

TL42

20 e

arth

leak

age

dete

ctor

to te

rmin

al 3

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f lo

ad

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

dD

iv. 1

, Gro

up A

, haz

ardo

us lo

catio

nM

inim

um

outp

ut

voltage

Eq

uiv

ale

nt

outp

ut

circ

uit

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Input

voltage

20 to

35V

dc

Haza

rdous-

are

a o

utp

ut

Min

imum

out

put v

olta

ge:

12.8

V at

48m

AM

axim

um o

utpu

t vol

tage

: 24

V fro

m 1

80C

urre

nt li

mit:

48m

AO

utp

ut

ripple

< 0.

5% o

f max

imum

out

put,

peak

to p

eak

Res

ponse

tim

eO

utpu

t with

in 1

0% o

f fin

al v

alue

with

in 1

00m

sLi

ne

fault d

etec

tion (

LFD

)O

pen

or s

hort

circ

uit i

n fie

ld c

ablin

g en

ergi

ses

solid

sta

te li

ne

faul

t sig

nal

LFD

tran

sisto

r is

sw

itche

d of

f, pr

ovid

ed th

at th

e fie

ld c

ircui

t im

peda

nce

is >

55

and

< 6

k5.

Line

fault s

ignal ch

ara

cter

istics

Max

imum

off-

state

vol

tage

: 35V

Max

imum

off-

state

leak

age

curr

ent:

10μA

Max

imum

on-

state

vol

tage

dro

p: 2

VM

axim

um o

n-sta

te c

urre

nt: 5

0mA

Not

e: L

FD s

igna

l is

Zene

r-dio

de p

rote

cted

aga

inst

indu

ctiv

e lo

ads

MT

L45

23L

SO

LE

NO

ID/

AL

AR

M D

RIV

ER

loop

-pow

ered

wit

h lin

e fa

ult

dete

ctio

n, I

IC

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rsYe

llow

: out

put s

tatu

s, o

n w

hen

outp

ut a

ctiv

eRe

d: L

FD in

dica

tion,

on

whe

n lin

e fa

ult d

etec

ted

Max

imum

curr

ent

consu

mption

100m

A a

t 24V

dc

Pow

er d

issi

pation w

ithin

unit

1.2W

with

typi

cal s

olen

oid

valv

e, o

utpu

t on

Safe

ty d

escr

iption

Vo=2

5V

Io=1

47m

A

Po=9

19m

W

Um =

253

V rm

s or

dc

SIL

capable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

MTL

45

23L

Haza

rdous

are

aSa

fe a

rea

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The

giv

en d

ata

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nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

Haza

rdous

are

aSa

fe a

rea

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rdous

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fe a

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MT

L45

24 –

MT

L55

24

SOL

EN

OID

/AL

AR

M D

RIV

ER

swit

ch o

pera

ted

wit

h ov

erri

de, I

IC

The

MTL

x524

ena

bles

an

on/o

ff de

vice

in

a ha

zard

ous

area

to

be

cont

rolle

d by

a v

olt-f

ree

cont

act

or l

ogic

sig

nal

in t

he s

afe

area

. It

can

driv

e lo

ads

such

as

sole

noid

s, a

larm

s, L

EDs

and

othe

r low

pow

er

devi

ces

that

are

cer

tifie

d as

intri

nsic

ally

saf

e or

are

cla

ssifi

ed a

s no

n-en

ergy

sto

ring

sim

ple

appa

ratu

s.

The

MTL

4524

allo

ws

a se

cond

saf

e-ar

ea s

witc

h or

log

ic s

igna

l to

be

con

nect

ed t

hat

enab

les

the

outp

ut t

o be

dis

able

d to

per

mit,

for

ex

ampl

e, a

saf

ety

syste

m to

ove

rrid

e a

cont

rol s

igna

l.Th

e M

TL55

24 m

ay h

ave

its p

hase

rev

erse

d by

con

nect

ing

a w

ire li

nk

betw

een

pins

8 a

nd 9

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f lo

ad

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

d D

iv.1,

Gro

up A

, haz

ardo

us lo

catio

nM

inim

um

outp

ut

voltage

Eq

uiv

ale

nt

outp

ut

circ

uit

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����

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Haza

rdous-

are

a o

utp

ut

Min

imum

out

put v

olta

ge:

12.8

V at

48m

AM

axim

um o

utpu

t vol

tage

: 24

V fro

m 1

80C

urre

nt li

mit:

48m

AO

utp

ut

ripple

< 0.

5% o

f max

imum

out

put,

peak

-to-p

eak

Contr

ol in

put

Suita

ble

for

switc

h co

ntac

ts, a

n op

en c

olle

ctor

tran

sisto

r or

logi

c dr

ive

0 =

inpu

t sw

itch

clos

ed, t

rans

isto

r on

or

<1.4

V ap

plie

d1

= in

put s

witc

h op

en, t

rans

isto

r of

f or

>4.5

V ap

plie

d O

verr

ide

input

on M

TL45

24

An

open

col

lect

or tr

ansi

stor

or a

sw

itch

conn

ecte

d ac

ross

the

term

inal

s ca

n be

use

d to

turn

the

outp

ut o

ff w

hate

ver

the

state

of

the

cont

rol i

nput

0

= tra

nsis

tor

on o

r sw

itch

clos

ed1

= tra

nsis

tor

off o

r sw

itch

open

Contr

ol and o

verr

ide

inputs

on M

TL45

24

Contr

ol in

put

Ove

rrid

e in

put

Outp

ut

state

00

off

01

on

10

off

11

off

Res

ponse

tim

eO

utpu

t with

in 1

0% o

f fin

al v

alue

with

in 1

00m

s

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: o

utpu

t sta

tus,

on

whe

n ou

tput

act

ive

Max

imum

curr

ent

consu

mption

100m

A a

t 24V

dc

Pow

er d

issi

pation w

ithin

unit

1.3W

with

typi

cal s

olen

oid

valv

e, o

utpu

t on

1.9W

wor

st ca

seSa

fety

des

crip

tion

Vo=2

5V

Io=1

47m

A

Po=9

19m

W

Um

= 2

53V

rms

or d

c

MTL

45

24

Haza

rdous

are

aSa

fe a

rea

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MTL

55

24

Haza

rdous

are

aSa

fe a

rea

& � � � �

' ( )

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3839

MT

L45

24S

SO

LE

NO

ID/A

LA

RM

DR

IVE

Rsw

itch

ope

rate

d w

ith

24V

ove

rrid

e, I

IC

The

MTL

4524

S en

able

s an

on/

off d

evic

e in

a h

azar

dous

are

a to

be

cont

rolle

d by

a v

olt-f

ree

cont

act o

r a

float

ing

logi

c si

gnal

in th

e sa

fe

area

. It c

an d

rive

load

s su

ch a

s so

leno

ids,

ala

rms,

LED

s an

d ot

her l

ow

pow

er d

evic

es th

at a

re c

ertif

ied

as in

trins

ical

ly s

afe

or a

re c

lass

ified

as

non

-ene

rgy

storin

g si

mpl

e ap

para

tus.

By

conn

ectin

g a

seco

nd s

afe-

area

vol

tage

, th

e ou

tput

can

be

disa

bled

to

perm

it, f

or e

xam

ple,

a

safe

ty s

yste

m to

ove

rrid

e a

cont

rol s

igna

l.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f lo

ad

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

d D

iv.1,

Gro

up A

, haz

ardo

us lo

catio

nM

inim

um

outp

ut

voltage

Eq

uiv

ale

nt

outp

ut

circ

uit

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������� ���

�����

��������

����

��

����

��4�� �%� �

�(�� �5� �

1����%��� ��6�( 3

Haza

rdous-

are

a o

utp

ut

Min

imum

out

put v

olta

ge:

12.8

V at

48m

AM

axim

um o

utpu

t vol

tage

: 24

V fro

m 1

80C

urre

nt li

mit:

48m

AO

utp

ut

ripple

< 0.

5% o

f max

imum

out

put,

peak

-to-p

eak

Contr

ol in

put

(must

be

fully

-flo

ating)

Suita

ble

for s

witc

h co

ntac

ts or

an

opto

-isol

ator

0 =

in

put s

witc

h cl

osed

, tra

nsis

tor

on o

r <

1.4V

app

lied

1 =

in

put s

witc

h op

en, t

rans

isto

r of

f or

> 4.

5V a

pplie

dO

verr

ide

input

A

24V

logi

c si

gnal

app

lied

acro

ss th

e te

rmin

als

allo

ws

the

sole

noid

/ala

rm to

be

oper

ated

by

the

cont

rol i

nput

. If i

t is

disc

onne

cted

, the

sol

enoi

d/al

arm

is o

ff.0

= <

2.0V

app

lied

acro

ss te

rmin

als

8 &

91

= >

9.0V

app

lied

acro

ss te

rmin

als

8 &

9

(nom

inal

sw

itchi

ng p

oint

4.5

V)Contr

ol and o

verr

ide

inputs

Contr

ol in

put

Ove

rrid

e in

put

Outp

ut

state

00

off

01

on

10

off

11

off

Res

ponse

tim

eO

utpu

t with

in 1

0% o

f fin

al v

alue

with

in 1

00m

s

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: o

utpu

t sta

tus,

on

whe

n ou

tput

act

ive

Max

imum

curr

ent

consu

mption

100m

A a

t 24V

dc

Pow

er d

issi

pation w

ithin

unit

1.3W

with

typi

cal s

olen

oid

valv

e, o

utpu

t on

1.9W

wor

st ca

seSa

fety

des

crip

tion

Vo=2

5V

Io=1

47m

A

Po=9

19m

W

Um

= 2

53V

rms

or d

c

MTL

45

24S

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

Haza

rdous

are

aSa

fe a

rea

& � � � �

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) ( '�� �� �

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MT

L45

25 –

MT

L55

25

SOL

EN

OID

/AL

AR

M D

RIV

ER

swit

ch o

pera

ted

wit

h ov

erri

de, I

IC,

low

pow

er

The

MTL

x525

ena

bles

an

on/o

ff de

vice

in

a ha

zard

ous

area

to

be

cont

rolle

d by

a v

olt-f

ree

cont

act

or l

ogic

sig

nal

in t

he s

afe

area

. It

can

driv

e lo

ads

such

as

sole

noid

s, a

larm

s, L

EDs

and

othe

r low

pow

er

devi

ces

that

are

cer

tifie

d as

intri

nsic

ally

saf

e or

are

cla

ssifi

ed a

s no

n-en

ergy

sto

ring

sim

ple

appa

ratu

s.

The

MTL

4525

allo

ws

a se

cond

saf

e-ar

ea s

witc

h or

log

ic s

igna

l to

be

con

nect

ed t

hat

enab

les

the

outp

ut t

o be

dis

able

d to

per

mit,

for

ex

ampl

e, a

saf

ety

syste

m to

ove

rrid

e a

cont

rol s

igna

l.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f lo

ad

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

d D

iv.1,

Gro

up A

, haz

ardo

us lo

catio

nM

inim

um

outp

ut

voltage

Eq

uiv

ale

nt

outp

ut

circ

uit

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� �5� �

1����%��� ��6�( 3

�(

*����������%�; 3<

*�����

8����/�

;�<��4�

'4

Haza

rdous-

are

a o

utp

ut

Min

imum

out

put v

olta

ge:

7V a

t 48m

AM

axim

um o

utpu

t vol

tage

: 24

V fro

m 3

00C

urre

nt li

mit:

48m

AO

utp

ut

ripple

< 0.

5% o

f max

imum

out

put,

peak

-to-p

eak

Contr

ol in

put

on M

TL45

25

Suita

ble

for

switc

h co

ntac

ts, a

n op

en c

olle

ctor

tran

sisto

r or

logi

c dr

ive

0 =

inpu

t sw

itch

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ed, t

rans

isto

r on

or

< 1.

4V a

pplie

d1

= in

put s

witc

h op

en, t

rans

isto

r of

f or

> 4.

5V a

pplie

dO

verr

ide

input

on M

TL45

25

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open

col

lect

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ansi

stor

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sw

itch

conn

ecte

d ac

ross

the

term

inal

s ca

n be

use

d to

turn

the

outp

ut o

ff w

hate

ver

the

state

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the

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rol i

nput

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= tra

nsis

tor

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r sw

itch

clos

ed1

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r sw

itch

open

Contr

ol and o

verr

ide

inputs

on M

TL45

25

Contr

ol in

put

Ove

rrid

e in

put

Outp

ut

state

00

off

01

on

10

off

11

off

Res

ponse

tim

eO

utpu

t with

in 1

0% o

f fin

al v

alue

with

in 1

00m

s

*Sig

nal p

lug

HA

Z1-3

is r

equi

red

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acce

ss to

this

func

tion

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: o

utpu

t sta

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on

whe

n ou

tput

act

ive

Max

imum

curr

ent

consu

mption

100m

A a

t 24V

dc

Pow

er d

issi

pation w

ithin

unit

1.3W

with

typi

cal s

olen

oid

valv

e, o

utpu

t on

1.9W

wor

st ca

seSa

fety

des

crip

tion

V o=25

V

I o=83

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A

P o=0.

52W

U

m =

253

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26 –

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26

SWIT

CH

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two

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ircui

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are

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trolle

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two

on-o

ff sw

itche

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logi

c si

gnal

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afe

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pplic

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idge

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chan

ging

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ther

eby

the

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an

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so

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r; th

e te

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ire a

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nd t

he t

rans

fer

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afe-

area

si

gnal

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to a

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put t

erm

inal

s no

t seg

rega

ted

from

ea

ch o

ther

. Th

e ou

tput

–rel

ay c

onta

cts

are

certi

fied

as n

on–e

nerg

y–sto

ring

appa

ratu

s, a

nd c

an b

e co

nnec

ted

to a

ny I

S ci

rcui

t w

ithou

t fu

rther

cer

tific

atio

n, p

rovi

ded

that

sep

arat

e IS

circ

uits

are

such

tha

t th

ey w

ould

rem

ain

safe

if c

onne

cted

toge

ther

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sTw

o, fu

lly fl

oatin

gLo

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ntr

ol ci

rcuit

Safe

are

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put/

outp

ut

chara

cter

istics

Conta

ct/L

ogic

mode

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ts su

itabl

e fo

r sw

itch

cont

acts,

an

open

–col

lect

or tr

ansi

stor

or lo

gic

driv

e)Re

lay

ener

gise

d if

<

450

or

< 1V

app

lied

Rela

y de

–ene

rgis

ed if

>

5k o

r >

2V a

pplie

d (3

5V m

ax.)

Loop p

ow

ered

mode

Rela

y en

ergi

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if

>20V

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y de

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<1

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er s

upply

failu

re p

rote

ctio

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lays

de–

ener

gise

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supp

ly fa

ilsRes

ponse

tim

e25

ms

nom

inal

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cts

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connec

tion t

o I

S ci

rcuits)

1–po

le c

hang

eove

r pe

r ch

anne

lConta

ct r

ating

250V

dc,

lim

ited

to 3

0V d

c fo

r IS

app

licat

ions

, 2A

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tive

load

s m

ust b

e su

ppre

ssed

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ct lif

e ex

pec

tancy

2 x

107 o

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axim

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load

Rel

ay d

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e sw

itch

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able

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itch

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loop

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act/

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ther

sw

itch

sele

cts

"1in

2out

" m

ode

*Sig

nal p

lug

HA

Z1-3

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equi

red

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acce

ss to

this

func

tion

LED

indic

ato

rsG

reen

: pow

er in

dica

tion

Yello

w: t

wo:

out

put s

tatu

s, o

n w

hen

rela

y en

ergi

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s41

mA

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0V d

c44

mA

at 2

4V d

c60

mA

at 3

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cPow

er d

issi

pation w

ithin

unit

1.1W

max

imum

at 2

4VSa

fety

des

crip

tion (

each

channel

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elay

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tact

s m

ay b

e co

nnec

ted

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circ

uit w

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t fur

ther

con

side

ratio

nU

ser

switch

set

tings

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ode

Mode

Funct

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SW1

SW2

SW3

SW4

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tact

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Inpu

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On

On

On

1in2

out

On

On

On

On

Loop

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2 ch

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Off

Off

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45

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MTL

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MTL

4533

MTL

4532

DIN-

rail

Devi

ce

MTL

5531

MTL

5533

MTL

5532

No. o

f ch

anne

ls

1 2 1

Impo

rtant

feat

ures

dc a

nd a

c vo

ltage

tran

sfer

dc a

nd a

c vo

ltage

tran

sfer

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ats

frequ

ency

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con

verts

toan

alog

ue v

alue

, plu

s tri

p fu

nctio

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t fro

mha

zard

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area

2-w

ire &

3-w

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brat

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prob

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2-w

ire &

3-w

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brat

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prob

es

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h, p

roxi

mity

dete

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puls

e, v

olta

gepu

lse

PULS

E AN

D VI

BRAT

ION

INPU

T -

Isol

ator

App

licat

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:

4243

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MTL

x531

repe

ats

a si

gnal

from

a v

ibra

tion

sens

or in

a h

azar

dous

ar

ea,

prov

idin

g an

out

put f

or a

mon

itorin

g sy

stem

in

the

safe

are

a.

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inte

rface

is

com

patib

le w

ith 3

-wire

edd

y-cu

rren

t pr

obes

and

ac

cele

rom

eter

s or

2-w

ire c

urre

nt s

enso

rs;

the

sele

ctio

n is

mad

e by

a

switc

h on

the

side

of t

he m

odul

e.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f si

gnal so

urc

eZo

ne 0

, IIC

, T4–

6 ha

zard

ous

area

if s

uita

bly

certi

fied

Div.

1, G

roup

A h

azar

dous

loca

tion

Haza

rdous-

are

a input

Inpu

t im

peda

nce

(term

inal

s 2

& 3

): 10

kTr

ansd

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sup

ply

volta

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s 3

& 1

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for

2-w

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enso

rs, u

ser

sele

ctab

le b

y sw

itch

Signal ra

nge

Min

imum

–20

V, m

axim

um –

0.5V

DC t

ransf

er a

ccura

cy a

t 20°C

<±50

mV

AC t

ransf

er a

ccura

cy a

t 20°C

0Hz

to 1

kHz:

±1%

1kH

z to

10k

Hz:

–5%

to +

1%10

kHz

to 2

0kH

z: –

10%

to +

1%Te

mper

atu

re c

oef

fici

ent

±50p

pm/°

C (1

0 to

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±100

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/°C

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to 1

0°C

)V

oltage

bandw

idth

–3

dB a

t 47k

Hz

(typi

cal)

Phase

res

ponse

<14μ

s, e

quiv

alen

t to:

–1°

at 2

00H

z–3

° at

600

Hz

–5°

at 1

kHz

–50°

at 1

0kH

z–1

00°

at 2

0kH

zSa

fe-a

rea o

utp

ut

imped

ance

<2

0

LED

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ato

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er in

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voltage

20 to

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imum

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rent

con

sum

ptio

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0mA

tran

sduc

er lo

ad)

96m

A a

t 24V

Max

imum

pow

er d

issi

pation w

ithin

unit

2WSa

fety

des

crip

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Term

inals

3 t

o 1

V o=2

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A

Po=0

.66W

U

m =

253

V rm

s or

dc

Term

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3 t

o 2

Non

-ene

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storin

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para

tus

1.5V

, 0.

1A a

nd

25m

W

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31 –

MT

L55

31

VIB

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e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

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guar

ante

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the

inte

rest

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her

tec

hnic

al d

evel

opm

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e re

serv

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e ri

ght

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ake

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ign

chan

ges

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MT

L45

32 –

MT

L55

32

PU

LSE

ISO

LAT

OR

puls

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4/2

0mA

cur

rent

out

puts

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MTL

x532

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olat

es

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s fro

m

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itch,

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ity

dete

ctor

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rren

t pu

lse t

rans

mitt

er o

r vo

ltage

pul

se t

rans

mitt

er l

ocat

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n a

haza

rdou

s ar

ea. I

t is

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l for

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licat

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invo

lvin

g hi

gh p

ulse

rat

es

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fast

resp

onse

tim

es,

by r

epea

ting

the

pulse

s in

to th

e sa

fe a

rea.

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n an

alog

ue o

utpu

t pr

opor

tiona

l to

fre

quen

cy i

s al

so p

rovi

ded,

to

geth

er w

ith a

rel

ay o

utpu

t, w

hich

may

be

conf

igur

ed to

act

as

an

alar

m. C

onfig

urat

ion

is c

arrie

d ou

t with

a p

erso

nal c

ompu

ter.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

ne, f

ully

floa

ting

Senso

r ty

pe

Switc

h or

pro

xim

ity d

etec

tor

(NA

MU

R/BS

EN

609

47–5

–6:2

001)

2– o

r 3–

wire

vol

tage

or

pulse

tran

smitt

erLo

cation o

f sw

itch

Zone

0, I

IC, T

6 ha

zard

ous

area

Div.

1, G

roup

A, h

azar

dous

loca

tion

Loca

tion o

f pro

xim

ity d

etec

tor

or

transm

itte

rZo

ne 0

, IIC

, T4–

T6 if

sui

tabl

y ce

rtifie

dD

iv.1,

Gro

up A

, haz

ardo

us lo

catio

nIn

put Sw

itch

input:

Out

put O

N if

sw

itch

is c

lose

dPro

xim

ity d

etec

tor

input:

Exci

tatio

n: 7

.0 to

9.0

V dc

from

1k

nom

inal

Out

put O

N if

inpu

t > 2

.1m

A*

(< 2

k)

Out

put O

FF if

inpu

t < 1

.2m

A*

(> 1

0k)

Switc

hing

hys

tere

sis:

0.2

mA

(650

) nom

inal

*NA

MU

R an

d BS

EN

609

47–5

–6:2

001s

tand

ards

Curr

ent

puls

e in

put:

Tran

smitt

er s

uppl

y: 1

6.5V

dc

at 2

0mA

Shor

t circ

uit c

urre

nt: 2

4mA

Out

put:

Iin >

9.0

mA

= O

N,

Iin

< 7.

0mA

= O

FFSw

itchi

ng h

yste

resi

s: 0

.5m

AV

oltage

puls

e in

put

Inpu

t im

peda

nce:

> 1

0kSw

itchi

ng p

oint

vol

tage

(Vsp):

3, 6

, or

12V

nom

inal

(Use

r se

lect

able

by

switc

hes

on th

e si

de o

f the

mod

ule)

Out

put:

Vin

> V

sp =

ON

,

Vin

< V sp

= O

FFSw

itchi

ng h

yste

resi

s: 1

00m

V +

(0.1

x V

sp) t

ypic

alSa

fe-a

rea p

uls

e outp

ut

Max

imum

off–

state

vol

tage

: 35V

Max

imum

off–

state

leak

age

curr

ent:

10μA

Max

imum

on–

state

res

ista

nce:

25

Max

imum

on–

state

cur

rent

: 50m

AO

utpu

t OFF

if s

uppl

y fa

ilsN

ote:

the

outp

ut is

zen

er d

iode

pro

tect

ed a

gain

st in

duct

ive

load

sSa

fe-a

rea c

urr

ent

outp

ut

Sign

al r

ange

: 4 to

20m

AU

nder

/ove

r ra

nge:

0 to

22m

ALo

ad r

esis

tanc

e:

0 to

450

@20

mA

Out

put r

esis

tanc

e: >

1MRi

pple

: < 5

0A

pea

k-to

-pea

kA

ccur

acy:

bet

ter

than

20

A a

t 20°

CTe

mpe

ratu

re d

rift:

< 1

A/°

CRe

spon

se d

elay

: TBA

ms

Ala

rm o

utp

ut

Rela

y O

N in

ala

rm, 0

.5A

@ 3

5Vdc

max

.

Puls

e w

idth

H

igh:

10μ

s m

inLo

w: 1

0μs

min

Freq

uen

cy r

ange

0 –

50kH

z - p

ulse

out

put m

ode

0 –

10KH

z - f

or a

nalo

gue

outp

utLE

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MTL

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S

MTL

4541

AM

TL45

41AS

MTL

4544

MTL

4544

S

MTL

4544

AM

TL45

44AS

MTL

4544

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DIN-

rail

Devi

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MTL

5541

MTL

5541

S

MTL

5541

AM

TL55

41AS

MTL

5544

MTL

5544

S

MTL

5544

AM

TL55

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MTL

5544

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No. o

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anne

ls

1 1 2 2 1

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feat

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patib

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ost 2

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mar

ttra

nsm

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s, s

ourc

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s,so

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ink

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mar

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ANAL

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INPU

T - T

RANS

MIT

TERS

, 4-2

0mA

CONV

ENTI

ONAL

AND

‘SM

ART’

Isol

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App

licat

ions

:

Two

Term

inal

Inpu

t - H

igh

Dens

ity

Thre

e Te

rmin

al In

put

4647

MT

L45

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TL

5541

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RE

PE

ATE

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OW

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PP

LY4/

20m

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AR

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2-

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- or

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ha

zard

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area

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d re

peat

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e cu

rren

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anot

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float

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r H

ART

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s, th

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igna

ls su

perim

pose

d on

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4/20

mA

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urre

nt.

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rnat

ivel

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e M

TLx5

41S

acts

as a

cur

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k fo

r a

safe

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a co

nnec

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load

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SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f tr

ansm

itte

rZo

ne 0

, IIC

, T4–

6 ha

zard

ous

area

if s

uita

bly

certi

fied

Div.

1, G

roup

A h

azar

dous

loca

tion

Safe

-are

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utp

ut

Sign

al r

ange

:

4

to 2

0mA

Und

er/o

ver-r

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:

0 to

24m

ASa

fe-a

rea

load

res

ista

nce

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x541

)

@ 2

4mA

:

0

to 3

60

@

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A:

0 to

450

Safe

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rent

sin

k:

60

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M

axim

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ourc

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dcSa

fe-a

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circ

uit o

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ista

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>

1MSa

fe-a

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ipple

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μA p

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ponse

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inal

val

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munic

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support

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ART

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min

als

1 &

2 o

nly)

LED

indic

ato

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reen

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er in

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tion

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imum

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ent

consu

mption

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20m

A s

igna

l)51

mA

at 2

4V

Pow

er d

issi

pation w

ithin

unit (

with

20m

A s

igna

l)M

TLx5

41

0.7W

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4V d

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fety

des

crip

tion

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inals

2 t

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=93m

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51m

W

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253

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s or

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inals

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mpl

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VSI

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pable

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s ha

ve b

een

asse

ssed

for

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C 6

1508

fu

nctio

nal s

afet

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plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

MTL

45

41 /

MTL

45

41S

MTL

55

41 /

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55

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assi

ve i

nput

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AR

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tra

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rovi

des

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nput

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sep

arat

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nsm

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d al

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s bi

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nal

trans

mis

sion

of

HA

RT

com

mun

icat

ion

sign

als

supe

rimpo

sed

on t

he 4

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op c

urre

nt.

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rnat

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e M

TLx5

41A

S ac

ts as

a c

urre

nt s

ink

for

a sa

fe-a

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conn

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rren

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o th

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IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f tr

ansm

itte

rZo

ne 0

, IIC

, T4–

6 ha

zard

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if s

uita

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certi

fied

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1, G

roup

A, h

azar

dous

loca

tion

Haza

rdous

are

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Sign

al r

ange

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4

to 2

0mA

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er/o

ver-r

ange

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put

imped

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for

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RT

signals

at te

rmin

als

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ax

imum

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rop

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rmin

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-are

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ut

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al r

ange

:

4

to 2

0mA

Und

er/o

ver-r

ange

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to 2

1.5m

ASa

fe-a

rea

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res

ista

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x541

A)

C

onve

ntio

nal t

rans

mitt

ers:

0

to 3

60

Smar

t tra

nsm

itter

s:

25

0 ±

10%

Safe

-are

a lo

ad (M

TLx5

41A

S)

C

urre

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ink:

600

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.

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imum

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tage

sou

rce:

24

V D

CSa

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uit o

utpu

t res

ista

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ircu

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ipple

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Hz

Transf

er a

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cy a

t 20°C

Bette

r th

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per

atu

re d

rift

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ponse

tim

eSe

ttles

with

in 2

00μA

of f

inal

val

ue a

fter

20m

sCom

munic

ations

support

edH

ART

LED

indic

ato

rG

reen

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er in

dica

tion

Pow

er r

equir

emen

t (w

ith 2

0mA

sig

nal)

50m

A a

t 20V

45m

A a

t 24V

35m

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t 35V

Pow

er d

issi

pation w

ithin

unit (

with

20m

A s

igna

ls)M

TLx5

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0.

8W @

24V

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MTL

x541

AS

1.1W

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4V d

cSa

fety

des

crip

tion

Term

inals

1 t

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m =

253

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s or

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de).

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vol

tage

mus

t be

cons

ider

ed w

hen

calc

ulat

ing

the

load

cap

acita

nce.

Non

-ene

rgy-

storin

g ap

para

tus

1.5V

, 0.

1A a

nd

25m

W; c

an

be c

onne

cted

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out f

urth

er c

ertif

icat

ion

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any

IS lo

op w

ith a

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en-c

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t vol

tage

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MTL

45

41A

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TL45

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supp

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two

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nal

2-w

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wire

4/2

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or

HA

RT t

rans

mitt

ers

loca

ted

in

a ha

zard

ous

area

, an

d re

peat

s th

e cu

rren

t in

ot

her

circ

uits

to d

rive

two

safe

-are

a lo

ads.

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sm

art

trans

mitt

ers,

the

uni

t al

low

s bi

-dire

ctio

nal

trans

mis

sion

of

digi

tal

com

mun

icat

ion

sign

als

supe

rimpo

sed

on

the

4/20

mA

lo

op

curr

ent.

Alte

rnat

ivel

y,

the

MTL

x544

S ac

ts as

a c

urre

nt s

ink

for

a sa

fe-a

rea

conn

ectio

n ra

ther

th

an d

rivin

g a

curr

ent i

nto

the

load

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sTw

oLo

cation o

f tr

ansm

itte

rZo

ne 0

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uita

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fied

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1, G

roup

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azar

dous

loca

tion

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-are

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utp

ut

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al r

ange

:

4

to 2

0mA

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er/o

ver-r

ange

:

0 to

24m

ASa

fe-a

rea

load

res

ista

nce

(MTL

x 54

4)

@ 2

4mA

:

0

to 3

60

@

20m

A:

0 to

450

Safe

-are

a lo

ad (M

TLx5

44S)

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rent

sin

k:

60

0m

ax.

M

axim

um v

olta

ge s

ourc

e:

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dcSa

fe-a

rea

circ

uit o

utpu

t res

ista

nce:

>

1MSa

fe-a

rea c

ircu

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ipple

< 50

μA p

eak-

to-p

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rdous-

are

a input

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al r

ange

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to 2

4mA

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ludi

ng o

ver-r

ange

) Tr

ansm

itter

vol

tage

: 16

.5V

at 2

0mA

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er a

ccura

cy a

t 20°C

Bette

r th

an 1

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Tem

per

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re d

rift

< 0.

8μA

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ponse

tim

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to w

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10%

of f

inal

val

ue w

ithin

50μ

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munic

ations

support

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ART

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als

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Ch

2

Ch

1

MTL

4544

MTL

4544

S

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A

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Vs–

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20 to

35V

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Ch

2

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Load

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I

I

6 5 4 3 2 1

9 8 712 11 10

1314

MTL

55

44 /

MTL

55

44S

LED

indic

ato

rG

reen

: pow

er in

dica

tion

Max

imum

curr

ent

consu

mption

(with

20m

A s

igna

ls)96

mA

at 2

4V d

cPow

er d

issi

pation w

ithin

unit (

with

20m

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igna

ls)M

TLx5

44

1.4W

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4V d

c M

TLx5

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1.9W

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fety

des

crip

tion (

each

channel

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rmin

als

2 t

o 1

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, and 5

to 4

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:V o=

28V

I o=

93m

A

P o=65

1mW

U

m =

253

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s or

dc

Term

inals

1 t

o 3

and 4

to 6

:Si

mpl

e ap

para

tus

1.5V

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1A a

nd

25m

W; c

an b

e co

nnec

ted

with

out f

urth

er c

ertif

icat

ion

into

any

IS lo

op w

ith a

n op

en-c

ircui

t vo

ltage

<28

V SI

L ca

pable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

MT

L45

44/S

– M

TL

5544

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EP

EAT

ER

PO

WE

R S

UP

PLY

two

chan

nel,

4/20

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RT

®,

for

2- o

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e tr

ansm

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rs

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giv

en d

ata

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nly

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nded

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duct

des

crip

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shou

ld n

ot b

e re

gar

ded

as

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gal

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ranty

of pro

per

ties

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ante

e. In

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inte

rest

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her

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hnic

al d

evel

opm

ents

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e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

MT

L45

44A

/AS

– M

TL

5544

A/A

S C

UR

RE

NT

RE

PE

ATE

R

4/20

mA

pas

sive

inp

ut f

or H

AR

T®

tra

nsm

itte

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The

MTL

x544

A p

rovi

des

an i

nput

for

sep

arat

ely

pow

ered

4/2

0mA

tra

nsm

itter

s an

d al

so a

llow

s bi

–dire

ctio

nal

trans

mis

sion

of

HA

RT

com

mun

icat

ion

sign

als

supe

rimpo

sed

on t

he 4

/20m

A lo

op c

urre

nt,

so t

hat

the

trans

mitt

er c

an b

e in

terr

ogat

ed e

ither

fro

m t

he o

pera

tor

statio

n or

by

a ha

nd-h

eld

com

mun

icat

or (

HH

C).

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rnat

ivel

y, t

he

MTL

x544

AS

acts

as a

cur

rent

sin

k fo

r a

safe

-are

a co

nnec

tion

rath

er

than

driv

ing

a cu

rren

t int

o th

e lo

ad.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sTw

oLo

cation o

f tr

ansm

itte

rZo

ne 0

, IIC

, T4–

6 ha

zard

ous

area

if s

uita

bly

certi

fied

Div.

1, G

roup

A, h

azar

dous

loc

atio

nH

aza

rdous

are

a input

Sign

al r

ange

:

4

to 2

0mA

Und

er/o

ver-r

ange

:

1.0

to 2

1.5m

AIn

put

imped

ance

for

HA

RT

signals

at te

rmin

als

1, 2

and

4, 5

: >

230

Max

imum

input

volt d

rop

at te

rmin

als

1, 2

and

4, 5

: <

6.6V

i.e. a

tran

smitt

er lo

ad o

f 330

at 2

0mA

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-are

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ut

Sign

al r

ange

:

4

to 2

0mA

Und

er/o

ver-r

ange

:

1.0

to 2

1.5m

ASa

fe-a

rea

load

res

ista

nce

(MTL

5544

A)

C

onve

ntio

nal t

rans

mitt

ers:

0

to 3

60

Smar

t tra

nsm

itter

s:

25

0 ±

10%

Safe

-are

a lo

ad (M

TL55

44A

S)

C

urre

nt s

ink:

600

max

.

Max

imum

vol

tage

sou

rce:

24

V D

CSa

fe-a

rea

circ

uit o

utpu

t res

ista

nce:

>

1MSa

fe–a

rea c

ircu

it r

ipple

< 50

μA p

eak-

to-p

eak

up to

80k

Hz

Transf

er a

ccura

cy a

t 20°C

Bette

r th

an 2

0μA

Tem

per

atu

re d

rift

< 1μ

A/°

CRes

ponse

tim

eSe

ttles

with

in 2

00μA

of f

inal

val

ue a

fter

20m

sCom

munic

ations

support

edH

ART

LED

indic

ato

rG

reen

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er in

dica

tion

Pow

er r

equir

emen

t (w

ith 2

0mA

sig

nal)

70m

A a

t 24V

85m

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t 20V

50m

A a

t 35V

Pow

er d

issi

pation w

ithin

unit (

with

20m

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igna

ls)M

TLx5

44A

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5W @

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x544

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fety

des

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inals

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m =

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dc.

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vol

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t be

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hen

calc

ulat

ing

the

load

cap

acita

nce.

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-ene

rgy-

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g ap

para

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1.5V

, 0.

1A a

nd

25m

W; c

an

be c

onne

cted

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out f

urth

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The

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des

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lly-fl

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g dc

sup

ply

for

ener

gisi

ng a

co

nven

tiona

l 2- o

r 3-w

ire 4

/20m

A tr

ansm

itter

loca

ted

in a

haz

ardo

us

area

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d re

peat

s th

e cu

rren

t in

othe

r ci

rcui

ts to

driv

e tw

o sa

fe-a

rea

load

s. F

or H

ART

2-w

ire t

rans

mitt

ers,

the

uni

t al

low

s bi

-dire

ctio

nal

trans

mis

sion

of

digi

tal

com

mun

icat

ion

sign

als

supe

rimpo

sed

on t

he

4/20

mA

loop

cur

rent

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neLo

cation o

f tr

ansm

itte

rZo

ne 0

, IIC

, T4–

6 ha

zard

ous

area

if s

uita

bly

certi

fied

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1, G

roup

A h

azar

dous

loca

tion

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-are

a o

utp

ut

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al r

ange

:

4

to 2

0mA

Und

er/o

ver-r

ange

:

0 to

24m

ASa

fe-a

rea

load

res

ista

nce

@

24m

A:

0 to

360

@ 2

0mA

:

0

to 4

50Sa

fe-a

rea

circ

uit o

utpu

t res

ista

nce:

>

1MSa

fe-a

rea c

ircu

it r

ipple

< 50

μA p

eak-

to-p

eak

Haza

rdous-

are

a input

Sign

al r

ange

: 0

to 2

4mA

(inc

ludi

ng o

ver-r

ange

) Tr

ansm

itter

vol

tage

: 16

.5V

at 2

0mA

Transf

er a

ccura

cy a

t 20°C

Bette

r th

an 1

5μA

Tem

per

atu

re d

rift

< 0.

8μA

/°C

Res

ponse

tim

eSe

ttles

to w

ithin

10%

of f

inal

val

ue w

ithin

50μ

sCom

munic

ations

support

edH

ART

(ter

min

als

1 &

2, o

utpu

t Ch

1 on

ly)

MT

L45

44D

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TL

5544

D

RE

PE

ATE

R P

OW

ER

SU

PP

LYsi

ngle

cha

nnel

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RT

®

for

2- o

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55

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indic

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er in

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tion

Max

imum

curr

ent

consu

mption

(with

20m

A s

igna

ls)96

mA

at 2

4V d

cPow

er d

issi

pation w

ithin

unit (

with

20m

A s

igna

ls)1.

4W @

24V

dc

Safe

ty d

escr

iption

Term

inals

2 t

o 1

and 3

:V o

=28V

Io

=93m

A

Po=6

51m

W

Um =

253

V rm

s or

dc

Term

inals

1 t

o 3

:Si

mpl

e ap

para

tus

1.5V

, 0.

1A a

nd

25m

W; c

an b

e co

nnec

ted

with

out f

urth

er c

ertif

icat

ion

into

any

IS lo

op w

ith a

n op

en-c

ircui

t vo

ltage

<28

VSI

L ca

pable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

Back

plan

eDe

vice

MTL

4546

MTL

4546

CM

TL45

46Y

MTL

4549

MTL

4549

CM

TL45

49Y

DIN-

rail

Devi

ce

MTL

5546

MTL

5546

CM

TL55

46Y

MTL

5549

MTL

5549

CM

TL55

49Y

No. o

f ch

anne

ls

1 1 2 2

Impo

rtant

feat

ures

Suita

ble

for H

ART

valv

e po

sitio

ners

,LF

D

Suita

ble

for H

ART

valv

e po

sitio

ners

,op

en c

ct L

FD

Suita

ble

for H

ART

valv

e po

sitio

ners

,LF

D

Suita

ble

for H

ART

valv

e po

sitio

ners

,op

en c

ct L

FD

Outp

ut to

haza

rdou

s ar

ea

1mA

<lo

<24

mA

Vmax

= 1

6V

1mA

<lo

<24

mA

Vmax

= 1

6V

1mA

<lo

<24

mA

Vmax

= 1

6V

1mA

<lo

<24

mA

Vmax

= 1

6V

ANAL

OGUE

OUT

PUT

- CO

NTRO

LLER

OUT

PUTS

, I/P

CON

VERT

ERS

Isol

ator

App

licat

ions

:

5253

MT

L45

46/C

/Y –

MT

L55

46/Y

IS

OL

ATIN

G D

RIV

ER

fo

r 4–

20m

A H

AR

T®

val

ve p

osit

ione

rs

wit

h lin

e fa

ult

dete

ctio

n

The

MTL

x546

ac

cept

s a

4/20

mA

flo

atin

g si

gnal

fro

m

a sa

fe-

area

co

ntro

ller

to

driv

e a

curr

ent/

pres

sure

co

nver

ter

(or

any

othe

r lo

ad u

p to

800

) in

a h

azar

dous

are

a. F

or H

ART

val

ve

posi

tione

rs,

the

mod

ule

also

per

mits

bi-d

irect

iona

l tra

nsm

issi

on o

f di

gita

l co

mm

unic

atio

n si

gnal

s. P

roce

ss c

ontro

llers

with

a r

eadb

ack

faci

lity

can

dete

ct

open

or

sh

ort

circ

uits

in

the

field

w

iring

: if

thes

e oc

cur,

the

curr

ent

take

n in

to t

he t

erm

inal

s dr

ops

to a

pre

set

leve

l. Th

e M

TL45

46C

and

the

MTL

x546

Y ar

e ve

ry s

imila

r to

the

M

TLx5

46

exce

pt

that

th

ey

prov

ide

open

ci

rcui

t de

tect

ion

only

(i.

e. n

o sh

ort-c

ircui

t det

ectio

n).

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

ne

Loca

tion o

f I/

P c

onve

rter

Zone

0, I

IC, T

4–6

haza

rdou

s ar

ea if

sui

tabl

y ce

rtifie

dD

iv. 1

, Gro

up A

, haz

ardo

us lo

catio

nW

ork

ing r

ange

4 to

20m

AD

igital si

gnal bandw

idth

500H

z to

10k

Hz

Max

imum

load r

esis

tance

800

(16V

at 2

0mA

)M

inim

um

load r

esis

tance

90 (s

hort-

circ

uit d

etec

tion

at <

50

)O

utp

ut

resi

stance

> 1M

Under

/ove

r ra

nge

capabili

tyU

nder

ran

ge =

1m

AO

ver

rang

e =

24m

A (l

oad

520

)In

put

and o

utp

ut

circ

uit r

ipple

< 40

μA p

eak-

to-p

eak

Transf

er a

ccura

cy a

t 20°C

Bette

r th

an 2

0μA

Tem

per

atu

re d

rift

< 1.

0μA

/°C

Input

chara

cter

istics

Fiel

d w

irin

g s

tate

MTL

x5

46

MTL

45

46

CM

TLx

54

6Y

Nor

mal

< 6.

0V<

6.0V

< 6.

0V

Ope

n-ci

rcui

t<

0.9m

A<

0.9m

A<

0.5m

A

Shor

t-circ

uit

< 0.

9mA

N.A

.N

.A.

Res

ponse

tim

eSe

ttles

with

in 2

00μA

of f

inal

val

ue w

ithin

100

ms

Com

munic

ations

support

edH

ART

LED

indic

ato

rG

reen

: pow

er in

dica

tion

Max

imum

cur

rent

con

sum

ptio

n (w

ith 2

0mA

signa

ls in

to 2

50lo

ad)

35m

A a

t 24V

dc

Pow

er d

issi

patio

n w

ithin

uni

t (w

ith 2

0mA

sig

nals

into

250

load

)0.

8W a

t 24V

Sa

fety

des

crip

tion

Vo=2

8V

Io=9

3mA

Po

=651

mW

U

m =

253

V rm

s or

dc

SIL

capable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

Haza

rdous

are

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fe a

rea

�

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45

46/C

/Y

Haza

rdous

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MTL

55

46/Y

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

MT

L45

49/C

/Y -

MT

L55

49/Y

ISO

LAT

ING

DR

IVE

R

two-

chan

nel,

for

4–20

mA

, HA

RT

®

valv

e po

siti

oner

s w

ith

line

faul

t de

tect

ion

The

MTL

x549

ac

cept

s 4/

20m

A

float

ing

sign

als

from

sa

fe-a

rea

cont

rolle

rs t

o dr

ive

2 cu

rren

t/pr

essu

re c

onve

rters

(or

any

oth

er lo

ad

up t

o 80

0)

in a

haz

ardo

us a

rea.

For

HA

RT v

alve

pos

ition

ers,

th

e m

odul

e al

so

perm

its

bi-d

irect

iona

l tra

nsm

issi

on

of

digi

tal

com

mun

icat

ion

sign

als.

Pro

cess

con

trolle

rs w

ith a

rea

dbac

k fa

cilit

y ca

n de

tect

op

en

or

shor

t ci

rcui

ts in

th

e fie

ld

wiri

ng:

if th

ese

occu

r, th

e cu

rren

t ta

ken

into

th

e te

rmin

als

drop

s to

a

pres

et

leve

l. Th

e M

TL45

49C

an

d M

TLx5

49Y

are

very

si

mila

r to

th

e M

TLx5

49

exce

pt

that

th

ey

prov

ide

open

ci

rcui

t de

tect

ion

only

(i.

e. n

o sh

ort-c

ircui

t det

ectio

n).

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

s

Two

Loca

tion o

f I/

P c

onve

rter

Zo

ne 0

, IIC

, T4–

6 ha

zard

ous

area

if s

uita

bly

certi

fied

D

iv. 1

, Gro

up A

, haz

ardo

us lo

catio

nW

ork

ing r

ange

4

to 2

0mA

Dig

ital si

gnal bandw

idth

50

0Hz

to 1

0kH

zM

ax

imum

load r

esis

tance

80

0 (1

6V a

t 20m

A)

Min

imum

load r

esis

tance

90

(sho

rt-ci

rcui

t det

ectio

n at

< 5

0)

Outp

ut

resi

stance

>

1MU

nder

/ove

r ra

nge

capabili

ty

Und

er r

ange

= 1

mA

O

ver

rang

e =

24m

A (l

oad

520

)In

put

and o

utp

ut

circ

uit r

ipple

<4

0μA

pea

k-to

-pea

kCom

munic

ations

support

edH

ART

Transf

er a

ccura

cy a

t 20°C

Be

tter

than

20μ

ATe

mper

atu

re d

rift

<

1.0μ

A/°

CIn

put

chara

cter

istics

Fiel

d w

irin

g s

tate

MTL

45

49

MTL

45

49

CM

TL4

54

9Y

Nor

mal

< 6.

0V<

6.0V

< 6.

0V

Ope

n-ci

rcui

t<

0.9m

A<

0.9m

A<

0.5m

A

Shor

t-circ

uit

< 0.

9mA

N.A

.N

.A.

Res

ponse

tim

e

Settl

es w

ithin

200

μA o

f fin

al v

alue

with

in 1

00m

s

Haza

rdous

are

aSa

fe a

rea

������

��� ����

��=� 3

��

� �

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45

49/C

/Y

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rdous

are

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fe a

rea

�=� 3

��

� �

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� �=� 3

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& � � � �

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) ( '�� �� �

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MTL

55

49/Y

LED

indic

ato

rG

reen

: pow

er in

dica

tion

Max

imum

cur

rent

con

sum

ptio

n (w

ith 2

0mA

sig

nals

into

250

load

)

70m

A a

t 24V

dc

Pow

er d

issi

patio

n w

ithin

uni

t (w

ith 2

0mA

sig

nals

into

250

load

)

1.6W

at 2

4VSa

fety

des

crip

tion (

each

channel

)

V o=2

8V

Io=9

3mA

Po

=0.6

5W

Um =

253

V rm

s or

dc

SIL

capable

Thes

e m

odel

s ha

ve b

een

asse

ssed

for

use

in IE

C 6

1508

fu

nctio

nal s

afet

y ap

plic

atio

ns. S

ee d

ata

on M

TL w

eb s

ite.

Back

plan

eDe

vice

MTL

4561

DIN-

rail

Devi

ce

MTL

5561

No. o

f ch

anne

ls

2

Impo

rtant

feat

ures

0-40

mA,

fire

and

sm

oke

dete

ctor

s

Outp

ut to

haza

rdou

s ar

ea

Loop

pow

ered

ANAL

OGUE

INPU

T - T

RANS

MIT

TERS

, 4-2

0mA

CONV

ENTI

ONAL

AND

‘SM

ART’

Isol

ator

App

licat

ions

:

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

5455

MT

L45

61 –

MT

L55

61

FIR

E A

ND

SM

OK

E

DE

TE

CT

OR

IN

TE

RFA

CE

tw

o-ch

anne

l

The

MTL

x561

is

a lo

op-p

ower

ed 2

–cha

nnel

int

erfa

ce f

or u

se w

ith

conv

entio

nal

fire

and

smok

e de

tect

ors

loca

ted

in h

azar

dous

are

as.

In o

pera

tion,

the

trig

gerin

g of

a d

etec

tor

caus

es a

cor

resp

ondi

ng

chan

ge i

n th

e sa

fe–a

rea

curr

ent.

The

unit

feat

ures

rev

erse

inp

ut

pola

rity

prot

ectio

n, w

hile

‘no

-fail’

ear

th f

ault

dete

ctio

n on

eith

er li

ne

can

be p

rovi

ded

by c

onne

ctin

g an

ear

th le

akag

e de

tect

or to

term

inal

3

and/

or 6

.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sTw

o, fu

lly fl

oatin

g, lo

op p

ower

edLo

cation o

f fi

re a

nd s

mok

e det

ecto

rsZo

ne 0

, IIC

, T4–

6 ha

zard

ous

area

if s

uita

bly

certi

fied

Div.

1, G

roup

A, h

azar

dous

are

aIn

put

voltage

6 to

30V

dc

Curr

ent

range

1 to

40m

A, n

omin

al

Quie

scen

t sa

fe–a

rea c

urr

ent

at

20°C

(haz

ardo

us–a

rea

term

inal

s op

en c

ircui

t)<

400μ

A a

t Vin

= 2

4V p

er c

hann

elIn

tegra

l in

put

pola

rity

pro

tect

ion

Inpu

t circ

uit p

rote

cted

aga

inst

reve

rse

pola

rity

‘No-f

ail’

eart

h f

ault p

rote

ctio

nEn

able

d by

con

nect

ing

term

inal

s 3

and/

or 6

to a

n ea

rth

leak

age

dete

ctor

(see

not

es)

Faul

t on

eith

er li

ne o

f eac

h ch

anne

l pro

clai

med

: uni

t con

tinue

s w

orki

ngN

otes

: 1.

To

mai

ntai

n is

olat

ion

betw

een

the

two

chan

nels,

sep

arat

e ea

rth l

eaka

ge

dete

ctor

s ar

e ne

eded

.2.

The

ear

th le

akag

e de

tect

ors

intro

duce

a 1

00μA

, 1H

z rip

ple

to th

e fie

ld c

ircui

t.M

inim

um

outp

ut

voltage

Vout

at

20°C

For V

in

25V

: Vo

ut =

Vin

– (0

.38

x cu

rren

t in

mA

) – 2

VFo

r Vin

> 2

5V:

Vout

= 2

2.5V

– (0

.35

x cu

rren

t in

mA

)M

ax

imum

outp

ut

voltage

28V

from

300

Transf

er a

ccura

cy a

t 20°C

Bette

r th

an 4

00μA

Tem

per

atu

re d

rift

<

4μA

/°C

( 0°

C to

60°

C)

< 15

μA/°

C (–

20°C

to 0

°C)

Res

ponse

tim

e to

ste

p input

Settl

es to

with

in 5

% o

f fin

al v

alue

with

in 1

.5m

sPow

er d

issi

pation w

ithin

unit

0.7W

max

imum

at 2

4V w

ith 4

0mA

sig

nal (

each

cha

nnel

)0.

9W m

axim

um a

t 30V

with

40m

A s

igna

l (ea

ch c

hann

el)

Safe

ty d

escr

iption f

or

each

channel

V o

=28V

Io

=93m

A

Po=0

.65W

U

m =

253

V rm

s or

dc

Haza

rdous

are

aSa

fe a

rea

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55

61

MTL

45

61

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rdous

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rea

�� �

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nal p

lug

HA

Z1-3

is r

equi

red

for

acce

ss to

this

func

tion

Back

plan

eDe

vice

MTL

4575

MTL

4576

-THC

DIN-

rail

Devi

ce

MTL

5575

MTL

5576

-THC

No. o

f ch

anne

ls

1 2

Impo

rtant

feat

ures

Confi

gura

ble

linea

rised

con

verte

r, tri

pal

arm

, ear

ly b

urn-

out d

etec

t

Confi

gura

ble

linea

rised

con

verte

r,ea

rly b

urn-

out d

etec

t, cu

stom

opt

ions

Inpu

t fro

mha

zard

ous

area

Ther

moc

oupl

e or

m

V so

urce

s

Ther

moc

oupl

e or

m

V so

urce

s

TEM

PERA

TURE

INPU

T - T

HERM

OCOU

PLE

AND

mV

SOUR

CES,

THC

Back

plan

eDe

vice

MTL

4575

MTL

4576

-RTD

DIN-

rail

Devi

ce

MTL

5575

MTL

5576

-RTD

No. o

f ch

anne

ls

1 2

Impo

rtant

feat

ures

Confi

gura

ble

linea

rised

con

verte

r, tri

pal

arm

, ear

ly b

urn-

out d

etec

t

Confi

gura

ble

linea

rised

con

verte

r,ea

rly b

urn-

out d

etec

t, cu

stom

opt

ions

Inpu

t fro

mha

zard

ous

area

Pt, C

u, N

i sen

sors

2/

3/4

wire

Pt, C

u, N

i sen

sors

2/

3 w

ire

TEM

PERA

TURE

INPU

T -

RESI

STAN

CE S

ENSO

RS, R

TD

Isol

ator

App

licat

ions

:

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

5657

The

MTL

x575

con

verts

a lo

w-le

vel d

c si

gnal

from

a te

mpe

ratu

re s

enso

r m

ount

ed i

n a

haza

rdou

s ar

ea i

nto

a 4/

20m

A c

urre

nt f

or d

rivin

g a

safe

-are

a lo

ad.

Softw

are

sele

ctab

le f

eatu

res

incl

ude

linea

risat

ion,

ra

ngin

g, m

onito

ring,

tes

ting

and

tagg

ing

for

all

ther

moc

oupl

e ty

pes

and

2-, 3

- or 4

-wire

RTD

s. (F

or th

erm

ocou

ple

appl

icat

ions

the

HA

Z-C

JC

plug

on

term

inal

s 1–

3 in

clud

es a

n in

tegr

al C

JC s

enso

r). C

onfig

urat

ion

is c

arrie

d ou

t us

ing

a pe

rson

al c

ompu

ter.

A s

ingl

e al

arm

out

put

is

prov

ided

and

may

be

conf

igur

ed fo

r hi

gh o

r lo

w p

roce

ss a

larm

or

to

prov

ide

notic

e of

ear

ly th

erm

ocou

ple

failu

re.

SPEC

IFIC

ATI

ON

See

als

o c

om

mon s

pec

ific

ation

Num

ber

of

channel

sO

neSi

gnal so

urc

eTH

C ty

pes

J, K,

T, E

, R, S

, B o

r N

to B

S 60

584

and

XKm

V in

put

RTD

s 2/

3/4-

wire

pla

tinum

to B

S 60

751

Pt

100

, Pt 5

00, P

t 100

0

Cu-

50 &

Cu-

53

Ni 1

00/5

00/1

000

DIN

437

60Lo

cation o

f si

gnal so

urc

eZo

ne 0

, IIC

, T4-

6 ha

zard

ous

area

Div

isio

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Pt &

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RTD

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pen

sation

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lect

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pen

sation e

rror

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ms

resp

onse

)Se

ries

mode

reje

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dB fo

r 50

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Calib

ration a

ccura

cy (

at

20°C

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udes

hyst

eres

is,

non-l

inea

rity

and r

epea

tabili

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puts

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C:

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alue

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RTD

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Tem

per

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pic

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puts

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003%

of i

nput

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D:

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am

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nd t

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re d

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sponse

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an:

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100

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ty d

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r fa

ilure

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cale

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lect

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udes

hyst

eres

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non-l

inea

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epea

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ty)

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put:

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80m

O

utp

ut:

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16μA

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per

atu

re d

rift

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pic

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put:

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0.6μ

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CEx

am

ple

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pan

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160

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ty d

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r fa

ilure

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cale

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le, o

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al in

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ponse

tim

eC

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le -

500

ms

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ult

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urac

y at

100

/200

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MTL

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pec

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ode

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hyst

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non-l

inea

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put:

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0.05

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put:

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IFIC

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ON

See

als

o c

om

mon s

pec

ific

ation

Wei

ght

60g

MTL

45

99N

6263

MT

L45

00 -

MT

L55

00 S

ER

IES

C

OM

MO

N S

PE

CIF

ICAT

ION

S

Plea

se g

o to

our

web

site

at w

ww

.mtl-

inst.

com

for t

he la

test

info

rmat

ion

rega

rdin

g sa

fety

app

rova

ls, c

ertif

icat

es a

nd e

ntity

par

amet

ers.

Connec

tors

Each

uni

t is

supp

lied

with

sig

nal c

onne

ctor

s, a

s ap

plic

able

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hen

usin

g cr

imp

ferr

ules

for

the

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rdou

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non

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us

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met

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be le

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14m

m.

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250V

rm

s, te

sted

at 1

500V

rm

s m

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safe

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ha

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twee

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circ

uits

and

pow

er s

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voltage

20 –

35V

dc

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tion o

f units

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are

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rmin

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mm

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rai

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5 or

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m) t

o EN

500

22A

mbie

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tem

per

atu

re lim

its

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to +

60°C

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eight

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PC

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PC s

ide:

USB

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ket

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rter

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ca

ble

with

3.

5mm

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3-po

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4500

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MTL

5500

ser

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conv

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her

earli

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onve

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1.5m

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M) (

supp

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eight

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um

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10

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MTL

4000

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4500

, MTL

5000

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5500

ser

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prod

ucts

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6465

MT

L59

91

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264

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47

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35m

m D

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eight

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bie

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tem

per

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pera

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tem

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50°C

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tem

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ture

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85°C

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amp

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greg

atio

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ous

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safe

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it un

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ata

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nly

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nded

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des

crip

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shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

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per

ties

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guar

ante

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the

inte

rest

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furt

her

tec

hnic

al d

evel

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ents

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e re

serv

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e ri

ght

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ign

chan

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ER

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EMA

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Appro

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module

space

r, 1

0m

m,

pack

of

5G

rey

spac

er, o

ne r

equi

red

betw

een

each

MTL

5995

and

any

ad

jace

nt m

odul

e on

a D

IN r

ail,

to p

rovi

de 1

0mm

air-

circ

ulat

ion

spac

e be

twee

n m

odul

es

EARTH

RA

IL A

ND

TA

G S

TRIP

IMB5

7 I

nsu

lating m

ounting b

lock

One

req

uire

d at

eac

h en

d of

a ta

ggin

g str

ip/e

arth

rai

l. Su

itabl

e fo

r lo

w-p

rofil

e (7

.5m

m) a

nd h

igh-

prof

ile (1

5mm

) sym

met

rical

D

IN r

ail.

ETM

7 E

art

h t

erm

inal,

bag o

f 5

0Fo

r te

rmin

atin

g ca

ble

scre

ens

and

0V r

etur

ns o

n th

e ER

L7

earth

rai

l. Fo

r ca

bles

4

mm

2 . Exa

ct d

imen

sion

dep

ende

nt o

n m

anuf

actu

rer.

TAG

57 T

aggin

g s

trip

, 1m

len

gth

Cut

to s

ize.

Sup

plie

d w

ith ta

ggin

g str

ip la

bel s

uita

ble

for

MTL

5000

or

MTL

5500

mod

ules

.

TGL5

7 T

aggin

g s

trip

label

s, s

et o

f 10 x

0.5

mSp

ares

rep

lace

men

t, fo

r us

e w

ith T

AG

57 ta

ggin

g str

ip. S

uita

ble

for

MTL

5000

or

MTL

5500

mod

ules

.

IND

IVID

UA

L IS

OLA

TOR ID

ENTI

FICA

TIO

NTH

5000 t

ag h

old

ers

Each

isol

ator

may

be

fitte

d w

ith a

cle

ar p

lasti

c ta

g ho

lder

, as

show

n be

low

. Ord

er T

H50

00, p

ack

of 2

0.

CO

NN

ECTO

RS

Each

MTL

5500

uni

t is

sup

plie

d w

ith s

igna

l an

d po

wer

con

nect

ors,

as

app

licab

le.

Spar

es re

plac

emen

t con

nect

ors a

re a

vaila

ble

sepa

rate

ly; s

ee o

rder

ing

info

rmat

ion.

ERB5

7S

Eart

h-r

ail

bra

cket

, st

raig

ht

Nic

kel-p

late

d; s

uppl

ied

with

two

push

faste

ners

, one

(14m

m,

35m

m2 ) e

arth

-rail

clam

p an

d on

e (1

0mm

, 16m

m2 ) e

arth

cla

mp.

ERL7

Eart

h r

ail,

1m

len

gth

Nic

kel-p

late

d; m

ay b

e cu

t to

leng

th.

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

CU

STO

M, S

TA

ND

AR

D A

ND

U

NIV

ER

SAL

BA

CK

PL

AN

ES

FOR

E

ASY

DC

S IN

TE

GR

ATIO

N

•

Tota

l fl

exib

ility

•

Red

uce

wir

ing

•

Sim

plif

y inst

alla

tion

•

Spec

ial fu

nct

ions

•

Signal co

nditio

nin

g•

HA

RT®

inte

gra

tion

DCS

vendors

/syst

ems

support

ed:

ABB A

uto

mation

S100

, IN

FI90

Rock

wel

l A

uto

mation

Ben

tly-N

evada

Fox

boro

IA F

BM &

FBM

2xx

Siem

ens-

Moore

APA

CS,

Qua

dlog

Honey

wel

lTD

C, P

lant

scap

eH

oney

wel

l-SM

SFS

CIC

STr

iple

x, P

lant

guar

dTr

iconex

Tric

on, T

riden

tYo

kogaw

aC

entu

m X

L,

XL, C

S100

0, C

S300

0, R

3Yo

kogaw

a I

ndust

rial Sa

fety

Syst

ems

ProS

afe

& P

roSa

fe R

S

The

MTL

4500

Ser

ies

back

plan

es,

encl

osur

es a

nd o

ther

acc

esso

ries

prov

ide

com

preh

ensi

ve,

flexi

ble

and

rem

arka

bly

com

pact

mou

ntin

g fa

cilit

ies

for

syste

m v

endo

rs,

orig

inal

equ

ipm

ent

man

ufac

ture

rs a

nd

end

user

s al

ike.

Cust

om

ised

back

pla

nes

MTL

pro

vide

s a

com

plet

e de

sign

and

man

ufac

turin

g se

rvic

e fo

r cu

stom

ised

bac

kpla

nes.

Cus

tom

ised

bac

kpla

nes

give

the

vend

ors

and

user

s of p

roce

ss c

ontro

l and

safe

ty sy

stem

s the

opp

ortu

nity

to in

tegr

ate

MTL

4500

/HA

RT®

mod

ules

dire

ctly

into

thei

r sy

stem

arc

hite

ctur

e. A

s th

ere

are

no h

azar

dous

-are

a ci

rcui

ts on

the

back

plan

es,

custo

mis

ed

vers

ions

can

be

prod

uced

with

out

the

need

for

IS

certi

ficat

ion,

so

sim

plify

ing

desi

gn a

nd lo

wer

ing

costs

.

Univ

ersa

l cu

stom

back

pla

nes

The

'uni

vers

al'

back

plan

e al

low

s a

fast

and

econ

omic

app

roac

h to

pr

ovid

ing

a cu

stom

int

erfa

ce.

Whe

re t

ight

tim

e sc

hedu

les

exis

t, th

e ba

ckpl

ane

can

be in

stalle

d to

allo

w th

e pa

nel b

uild

ing

and

wiri

ng to

be

com

plet

ed.

The

custo

mis

ed a

dapt

er c

ard

can

then

be

plug

ged

in

at a

ny ti

me

up to

inte

grat

ed te

st.

Adapte

r ca

rds

Ada

pter

car

ds a

lread

y ex

ist

for

man

y of

the

DC

S co

mpa

nies

. In

ad

ditio

n th

ere

is a

rang

e of

gen

eral

pur

pose

car

ds th

at o

ffer r

educ

ed

wiri

ng fo

r us

e w

ith s

peci

fic M

TL m

odul

es. T

hese

are

also

ava

ilabl

e in

le

ft- a

nd r

ight

-han

d ve

rsio

ns to

eas

e pa

nel w

iring

.

Standard

MTL

back

pla

nes

Stan

dard

MTL

bac

kpla

nes

are

avai

labl

e to

acc

omm

odat

e 4,

8, 1

6, o

r 24

mod

ules

usi

ng s

crew

-cla

mp

conn

ecto

rs f

or th

e sa

fe-a

rea

circ

uits.

O

n an

ind

ivid

ual b

ackp

lane

, an

y m

odul

e ca

n be

plu

gged

int

o an

y po

sitio

n an

d m

odul

e ty

pes

can

be m

ixed

. Fo

r 8-

, 16

- an

d 24

-way

ba

ckpl

anes

, sc

rew

-cla

mp

conn

ecto

rs w

hich

plu

g in

to th

e ba

ckpl

anes

pr

ovid

e pr

imar

y an

d se

cond

ary

24V

dc p

ower

sup

plie

s. P

ower

to

seve

ral

8- o

r 16

-way

bac

kpla

nes

can

be i

nter

conn

ecte

d to

red

uce

and

sim

plify

wiri

ng –

see

instr

uctio

n m

anua

l IN

M45

00

for

deta

ils.

Optional acc

esso

ries

Opt

iona

l ac

cess

orie

s in

clud

e co

lour

cod

ed t

aggi

ng s

trip

kits

for

all

thre

e si

zes

of b

ackp

lane

and

ear

th ra

il ki

ts fo

r 8 a

nd 1

6-w

ay v

ersi

ons.

M

ount

ing

acce

ssor

ies

are

avai

labl

e fo

r su

rface

(al

l ba

ckpl

anes

), T-s

ectio

n an

d G

-sect

ion

DIN

-rail

(8-

and

16-w

ay v

ersi

ons)

, an

d a

horiz

onta

l pla

te fo

r m

ount

ing

24-w

ay b

ackp

lane

s in

19-

inch

rac

ks.

Wea

ther

pro

of

encl

osu

res

Wea

ther

proo

f en

clos

ures

ar

e av

aila

ble

for

appl

icat

ions

w

here

se

para

te s

afe–

area

enc

losu

res

are

requ

ired

for

back

plan

es w

ith

mod

ules

. A

vaila

ble

to

acco

mm

odat

e on

e 4-

way

or

on

e 8-

way

ba

ckpl

ane,

th

ey

are

man

ufac

ture

d fro

m

GRP

gi

ving

pr

otec

tion

agai

nst

dust

and

wat

er t

o IE

C52

9:IP

65.

The

lids

are

mad

e fro

m

trans

pare

nt h

igh-

stren

gth

poly

carb

onat

e so

tha

t LE

Ds,

sw

itche

s, e

tc,

on th

e to

ps o

f the

mod

ules

are

eas

y to

see

.

MO

UN

TIN

G K

ITS

ACC

ESSO

RIES

Back

pla

ne

mod

el n

o.N

umber

of

mod

ules

Safe

-are

a

conn

ectio

nsSu

rface

DIN

–rail

(T

or

G)

19–i

nch

rack

Eart

h–ra

il kit

Tagg

ing

stri

p k

itSp

are

fus

e pack

CPS

044

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w–c

lam

pSM

S01

DM

K01

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CPS

088

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w–c

lam

pSM

S01

DM

K01

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K08

TSK0

8FU

S1.0

ATE5

CPS

1616

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w–c

lam

pSM

S01

DM

K01

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K16

TSK1

6FU

S2.0

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CPS

2424

Scre

w–c

lam

pSM

S01

DM

K01

HM

P24

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posi

tions

per

mod

ule

Pow

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ense

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sepa

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plu

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p co

nnec

tor

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HM

P24 m

ounting p

late

for

19 inch

rack

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

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ake

des

ign

chan

ges

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OR

DER

ING

IN

FOR

MA

TIO

N

MTL

45

00/5

500 S

erie

s is

ola

tors

Spec

ify p

art n

umbe

r: eg

, MTL

45

11,

MTL

55

75

Indiv

idual is

ola

tor

iden

tifi

cation

TH5

000

Ta

g ho

lder

(Pac

k of

20)

Connec

tors

- M

TL45

00 &

MTL

55

00

HA

Z1-3

H

azar

dous

-are

a pl

ug,

term

inal

s 1,

2 a

nd 3

HA

Z4-6

H

azar

dous

-are

a pl

ug,

term

inal

s 4,

5 a

nd 6

HA

Z-C

JC

Haz

ardo

us-a

rea

plug

, ter

min

als

1 an

d 3

with

col

d-ju

nctio

n se

nsor

HA

Z-C

JC2

H

azar

dous

-are

a pl

ug, t

erm

inal

s 4

and

6 w

ith c

old-

junc

tion

sens

orSA

F1-3

Sa

fe-a

rea

plug

, te

rmin

als

1, 2

and

3SA

F4-6

Sa

fe-a

rea

plug

, te

rmin

als

4, 5

and

6

Connec

tors

- M

TL5

500 o

nly

SAF7

-9

Safe

-are

a pl

ug,

term

inal

s 7,

8 a

nd 9

SAF1

0-1

2

Safe

-are

a pl

ug,

term

inal

s 10

, 11

and

12PW

R5

000

Po

wer

con

nect

or,

term

inal

s 13

and

14

Pow

erBus

- M

TL5

500 o

nly

PB-8

T Po

wer

bus

Kit f

or u

p to

8 is

olat

ors

PB-1

6T

Pow

erbu

s Ki

t for

up

to 1

6 is

olat

ors

PB-2

4T

Pow

erbu

s Ki

t for

u p

to 2

4 is

olat

ors

PB-3

2T

Pow

erbu

s Ki

t for

up

to 3

2 is

olat

ors

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55

00 M

ounting a

cces

sori

esTH

R2

1m le

ngth

of D

IN r

ail t

o EN

500

22;

BS

558

4; D

IN 4

6277

MS0

10

DIN

-rail

mod

ule

spac

er, 1

0mm

(p

ack

of 5

)

MTL

55

00 E

art

h-r

ail

and t

ag s

trip

acc

esso

ries

IMB5

7

Insu

latin

g m

ount

ing

bloc

kER

B5

7S

Earth

-rail

brac

ket,

strai

ght

ERL7

Ea

rth-ra

il, 1

m le

ngth

ETM

7

Earth

term

inal

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G5

7

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ing

strip

, 1m

leng

thTG

L57

Tagg

ing

strip

labe

ls, s

et o

f 10

x 0.

5m

MTL

55

00 E

ncl

osu

res

DX

070

En

clos

ure

for

MTL

5500

x 4

DX

170

En

clos

ure

for

MTL

5500

x 1

0D

X430

Encl

osur

e fo

r M

TL55

00 x

26

MTL

45

00 S

tandard

Back

pla

nes

CPS0

4

4-w

ay b

ackp

lane

scr

ew-c

lam

p co

nnec

tor

CPS0

8

8-w

ay b

ackp

lane

scr

ew-c

lam

p co

nnec

tor

CPS1

6

16-w

ay b

ackp

lane

scr

ew-c

lam

p co

nnec

tor

CPS2

4

24-w

ay b

ackp

lane

scr

ew-c

lam

p co

nnec

tor

MTL

45

00 C

ust

om

Back

pla

nes

C

onta

ct M

TL fo

r op

tions

and

adv

ice

MTL

45

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ack

pla

ne

mounting a

cces

sori

esD

MK

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-rail

mou

ntin

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or

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n

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way

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ire 4

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16-w

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lane

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quire

6SM

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rface

mou

ntin

g ki

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ck o

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and

8-w

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lane

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quire

4,

16

-way

bac

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nes

requ

ire 6

,

24-w

ay b

ackp

lane

s re

quire

8H

MP24

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oriz

onta

l mou

ntin

g pl

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scre

ws

for

19-in

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ack

mou

ntin

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lane

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K08

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ount

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ne 4

- or

8-w

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lane

BM

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ount

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or o

ne 1

6-w

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ackp

lane

MTL

45

00 B

ack

pla

ne

acc

esso

ries

ERK

08

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rth r

ail k

it fo

r C

PS08

bac

kpla

ne

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16

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rth r

ail k

it fo

r C

PS16

bac

kpla

ne

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ggin

g str

ip k

it fo

r C

PS08

bac

kpla

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TSK

16

Ta

ggin

g str

ip k

it fo

r C

PS16

bac

kpla

ne

TSK

24

Ta

ggin

g str

ip k

it fo

r C

PS24

bac

kpla

ne

FUS1

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TE5

Fus

e ki

t for

4- a

nd 8

-way

bac

kpla

nes,

(1

0 pe

r pa

ck)

FUS2

.0A

TE5

Fus

e ki

t for

16-

way

bac

kpla

ne,

(1

0 pe

r pa

ck)

FUS4

.0A

TE5

Fus

e ki

t for

24-

way

bac

kpla

nes,

(1

0 pe

r pa

ck)

MCK

45

M

TL40

00 b

ackp

lane

con

vers

ion

kit

(1

6 cl

ip p

airs

per

pac

k)

MPL0

1

Mod

ule

posi

tion

labe

l (bl

ank)

(5

0 pe

r pa

ck)

Lite

ratu

reIN

M5

500

M

TL55

00 S

erie

s in

struc

tion

man

ual

INM

45

00

M

TL45

00 S

erie

s in

struc

tion

man

ual

Confi

gura

tor

and s

oft

ware

PCL4

5U

SB

Con

figur

ator

, PC

inte

rface

and

sof

twar

e

PCS4

5

PC s

oftw

are

Ple

ase

go to

our

web

site

at w

ww

.mtl-i

nst

.com

for

the

late

st in

form

ation r

egard

ing s

afe

ty a

ppro

vals

, cer

tifi

cate

s and e

ntity

para

met

ers.

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

HART

® M

ultip

lexe

rsM

TL p

rovi

des

the

conn

ectio

ns b

etw

een

HART

fiel

d in

stru

men

ts, c

ontr

ol s

yste

ms

and

proc

ess

auto

mat

ion

man

agem

ent

softw

are.

Whe

ther

for

a n

ew i

nsta

llatio

n or

the

upg

rade

of

an e

xist

ing

faci

lity,

MTL

pro

vide

s so

lutio

ns f

or t

radi

tiona

l I/O

and

pr

oces

s sy

stem

s in

bot

h IS

and

gen

eral

pur

pose

app

licat

ions

.

The

HART

® p

roto

col i

s a

pow

erfu

l com

mun

icat

ion

tech

nolo

gy u

sed

to r

ealis

e th

e fu

ll po

tent

ial o

f dig

ital f

ield

dev

ices

w

hils

t pre

serv

ing

the

trad

ition

al 4

-20m

A an

alog

ue s

igna

l. H

ART®

pro

vide

s si

mul

tane

ous

anal

ogue

and

dig

ital o

pera

tion

so t

hat

the

4-20

mA

anal

ogue

sig

nal c

an b

e co

nnec

ted

to c

onve

ntio

nal I

/O c

ards

or

mod

ules

for

mea

sure

men

t an

d co

ntro

l, w

hile

the

digi

tal s

igna

l can

be

used

for m

onito

ring

proc

ess

varia

bles

, acc

essi

ng d

evic

e st

atus

and

dia

gnos

tics,

or

impl

emen

ting

conf

igur

atio

n ch

ange

s.

MTL

’s H

ART®

con

nect

ions

pro

vide

the

mea

ns t

o m

ake

full

use

of t

hese

fea

ture

s. B

y co

nnec

ting

field

ins

trum

ents

, co

ntro

l sys

tem

s an

d in

stru

men

t m

anag

emen

t so

ftwar

e, M

TL’s

HAR

T® c

onne

ctio

ns a

llow

bet

ter

use

of m

aint

enan

ce

reso

urce

s, r

educ

ed c

omm

issi

onin

g an

d pr

oces

s do

wn-

time,

and

con

sequ

ent l

ower

cos

ts fo

r co

mm

issi

onin

g an

d lo

op

mai

nten

ance

.

Ther

e ar

e tw

o ty

pes

of H

ART®

mul

tiple

xer

to s

uit n

ew o

r ex

istin

g in

stal

latio

ns:

• Th

e ne

w M

TL48

50 c

ompa

ct 3

2-ch

anne

l mod

ule

• Th

e w

ell e

stab

lishe

d M

TL48

40 S

erie

s w

ith 1

6-ch

anne

l mod

ular

ity.

Both

of

thes

e pr

oduc

t lin

es o

ffer

a fu

ll ra

nge

of c

onne

ctio

n su

ppor

t el

emen

ts a

nd w

ill l

ink

with

mos

t in

stru

men

t m

anag

emen

t sof

twar

e pa

ckag

es b

y us

e of

the

rele

vant

driv

er o

r de

finiti

on fi

les.

HART

® is

a r

egis

tere

d tr

adem

ark

of H

ART

Com

mun

icat

ion

Foun

datio

n

7071

HA

RT®

Multip

lex

er

MTL

4850

•

Auto

baud r

ate

det

ection

•

LED

indic

ation f

or

fault

dia

gnosi

s•

Isola

ted P

ow

er S

upply

•

Firm

ware

upgra

dea

ble

•

Onboard

Dia

gnost

ics

•

Ala

rm o

utp

ut

•

Des

igned

to m

ount

dir

ectly t

o a

ra

nge

of

cust

om

ised

connec

tion

units

•

Des

igned

for

use

in S

IL3 loops

(non inte

rfer

ing)

•

Connec

t ove

r 2000 loops

on

one

RS4

85

net

work

The

MTL

48

50

H

AR

T m

ultip

lex

er

prov

ides

a

sim

ple

inte

rface

bet

wee

n sm

art

devi

ces

in t

he

field

, c

ontro

l/sa

fety

sys

tem

s an

d H

ART

® in

strum

ent

man

agem

ent s

oftw

are

runn

ing

on a

PC

.

The

syst

em is

base

d o

n 3

2-c

hannel

mod

ular

ity

to

prov

ide

a co

mpa

ct,

easi

ly

conf

igur

able

an

d ex

pand

able

sys

tem

. U

sing

a s

tand

ard

RS48

5 se

rial

link,

up

to 2

016

indi

vidu

al H

ART

dev

ices

can

be

conn

ecte

d to

a s

ingl

e ne

twor

k.

For

the

optim

um

solu

tion

, the

MTL

4850

mou

nts

dire

ctly

to

eith

er a

ran

ge o

f ge

neric

or

custo

mis

ed

conn

ectio

n un

its/b

ackp

lane

s.

Connec

tivi

ty

to

HA

RT

Confi

gura

tion

and

Inst

rum

ent

Managem

ent

Soft

ware

The

onl

ine

acc

ess

to the

info

rmatio

n c

onta

ined

w

ithin

HA

RT d

evic

es a

llow

s us

ers

to d

iagn

ose

field

de

vice

tro

uble

s be

fore

the

y le

ad t

o co

stly

prob

lem

s.

Softw

are

can

capt

ure

and

use

diag

nosti

c da

ta f

rom

H

ART

fie

ld i

nstru

men

ts vi

a th

e M

TL H

ART

con

nect

ion

hard

war

e. T

his

allo

ws

user

s to

real

ise th

e fu

ll po

tent

ial

of t

heir

field

dev

ices

to

optim

ise p

lant

ass

ets,

whi

ch

resu

lts

in

signi

fican

t op

erat

ions

im

prov

emen

t an

d di

rect

mai

nten

ance

sav

ings

.

IMS

pro

duct

s pro

vide

esse

ntia

l co

nfig

urat

ion,

ca

libra

tion,

m

onito

ring

and

mai

nten

ance

hi

story

fu

nctio

ns f

or c

onve

ntio

nal a

nalo

gue

(4-2

0 m

A)

and

HA

RT p

roto

col c

ompa

tible

sm

art p

roce

ss in

strum

ents

and

field

dev

ices

. The

y de

liver

pow

erfu

l too

ls to

mee

t th

e ne

ed f

or s

tand

ardi

sed

instr

umen

t m

aint

enan

ce

proc

edur

es a

nd r

ecor

d ke

epin

g m

anda

ted

by s

ome

qual

ity s

tand

ards

and

reg

ulat

ory

bodi

es.

The

ben

efits

of u

tilis

ing

thes

e po

wer

ful

softw

are

pack

ages

onl

ine

incl

ude:

• Re

duce

d co

mm

issi

onin

g tim

e an

d co

sts

• Re

duce

d m

aint

enan

ce c

osts

• Re

duce

d do

cum

enta

tion

• Re

duce

d pr

oces

s do

wnt

ime

The

MTL

4850

of

fers

co

nnec

tivity

to

a

com

preh

ensi

ve

rang

e of

FD

T ba

sed

softw

are

pack

ages

vi

a th

e co

mm

s D

evic

e Ty

pe

Man

ager

(D

TM).

The

DTM

ca

n be

do

wnl

oade

d fro

m

ww

w.m

tl-in

st.co

m.

Oth

er s

oftw

are

pack

ages

wor

k w

ith t

he M

TL48

50 t

hrou

gh c

usto

m s

oftw

are

driv

ers

or b

y th

e in

clus

ion

of th

e de

vice

des

crip

tion

(DD

) file

fo

r th

e M

TL m

ultip

lexe

rs

HA

RT®

is a

regi

stere

d tra

dem

ark

of th

e H

ART

Com

mun

icat

ion

Foun

datio

n

7273

SPEC

IFIC

ATI

ON

Num

ber

of

channel

s32

Channel

tra

nsm

itte

r ty

pe

HA

RT r

ev 5

– 7

Channel

inte

rface

2 co

nnec

tions

to e

ach

chan

nel f

ield

loop

(64

tota

l)H

ost

syst

em inte

rface

RS48

5 2-

wire

mul

tidro

p (u

p to

63

MTL

4850

mod

ules

can

be

conn

ecte

d to

one

hos

t)RS4

85

baud r

ate

3840

0, 1

9200

, 960

0, 1

200

baud

- (a

uto-

dete

cted

)A

ddre

ss s

elec

tion

8-bi

t int

erfa

ce, u

p to

64

addr

esse

sA

larm

outp

ut

(Ope

n C

olle

ctor

- Re

fere

nced

to 0

V)V m

ax =

35V

, Im

ax =

5m

A, P

max

= 1

00m

W

ISO

LATI

ON

Channel

-to-c

hannel

iso

lation

50V

dcFi

eld loop iso

lation

50V

dcM

odul

e is

cou

pled

to lo

ops

via

capa

cito

r in

eac

h co

nnec

tion

leg

(i.e.

2 c

apac

itors

per

cha

nnel

)RS4

85

inte

rface

iso

lation (

Betw

een

mod

ule

and

inte

rface

)25

V dc

Ala

rm o

utp

ut

isola

tion (

Betw

een

mod

ule

and

outp

ut)

50V

dcPSU

iso

lation (

Betw

een

mod

ule

and

PSU

inpu

t)50

V dc

PO

WER

Supply

voltage

19V

to 3

5V d

cCurr

rent

consu

mption

60m

A a

t 24V

±10

%Pow

er d

issi

pation

<1.6

W a

t 24V

±10

%PSU

pro

tect

ion

Reve

rsed

pol

arity

pro

tect

edFu

sed

(375

mA

)

ENV

IRO

NM

ENTA

LTe

mper

atu

re r

ange

Ope

ratin

g:

–40°

C to

+70

°CN

on-o

pera

ting:

–40

°C to

+85

°CRel

ative

hum

idity

5% to

95%

- no

n-co

nden

sing

MEC

HA

NIC

AL

Dim

ensi

ons

See

draw

ing

Wei

ght

125

g

Com

patib

le F

DT

Fram

es in

clud

e:-

FDT

Fram

eM

anufa

cture

rFi

eldC

are

Endr

ess

& H

ause

r/M

etso

Aut

omat

ion

PAC

Twar

ePA

CTw

are

Con

sorti

umFi

eldM

ate

Yoko

gaw

aFD

T C

onta

iner

M&

M S

oftw

are

Appro

vals

Zone

2 m

ount

ing

ATEX

& IE

CEx

Div

2 m

ount

ing

C

SA, F

M &

FM

C

For

full

deta

ils o

f app

rova

ls an

d ce

rtific

atio

n re

fer

to th

e M

TL w

ebsi

te

- see

bel

ow.

LED

IN

DIC

ATO

RS

LED

Colo

ur

State

Des

crip

tion

PW

Rgr

een

Off

Mul

tiple

xer

is n

ot r

ecei

ving

po

wer

On

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tiple

xer

is r

ecei

ving

pow

er

FAU

LTre

dO

ffM

ultip

lexe

r is

in th

e ru

nnin

g sta

te

Stea

dy

flash

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tiple

xer

rebu

ild is

in p

rogr

ess

Shor

t/lo

ng

flash

No

HA

RT lo

ops

foun

d

On

(ste

ady)

A fa

ult w

as d

etec

ted

and

mul

tiple

xer

oper

atio

n w

as h

alte

d

HO

STye

llow

Off

No

com

mun

icat

ion

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e ch

anne

l

Shor

t fla

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.25

sec)

Cor

rect

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amed

mes

sage

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ceiv

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y th

e m

ultip

lexe

r

Long

flas

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sec

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spon

se tr

ansm

itted

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is

is r

e-tri

gger

able

so

repe

ated

tra

nsm

issi

ons

will

leav

e th

e in

dica

tor

perm

anen

tly o

n

HA

RT

yello

wO

ffN

o co

mm

unic

atio

n on

the

chan

nel

Shor

t fla

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.25

sec)

Mes

sage

tran

smitt

ed

Long

flas

h(1

sec

)Re

spon

se tr

ansm

itted

—th

is

is r

e-tri

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able

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the

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tec

hnic

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S G

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ART

mul

tiple

xer

mod

ules

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imum

pow

er r

equir

emen

ts2.

9W w

hen

equi

pped

with

–2

x M

TL48

50 H

ART

mul

tiple

xers

mod

ules

HA

RT

inte

rface

connec

tors

4 x

DIN

4165

1 20

-way

HA

RT s

igna

l cab

les

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HA

RT s

igna

l con

nect

ions

+ 4

com

mon

ret

urns

on

each

ca

ble.

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nect

ions

to H

ART

sig

nals

via

scre

w te

rmin

al in

terfa

ce

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usto

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tact

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module

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cces

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mul

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fitte

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car

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port

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crew

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ART

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lam

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nel

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r fu

rther

det

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of th

e m

odel

opt

ions

re

fer

to th

e In

struc

tion

Man

ual I

NM

4850

- av

aila

ble

from

the

MTL

web

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MPLE

TE S

YST

EMTh

e fo

llow

ing

com

pone

nts

form

a c

ompl

ete

syste

m:

MTL

4840 H

ART®

connec

tion s

yst

em –

pro

vide

s si

mpl

e co

nnec

tion

to fi

eld

instr

umen

ts, u

sing

gen

eral

pu

rpos

e an

d IS

term

inat

ion

boar

ds.

Per

sonal co

mpute

r –

runn

ing

instr

umen

t m

anag

emen

t sof

twar

e an

d lin

ked

to M

TL48

41 H

ART

co

mm

unic

atio

ns m

odul

es b

y:

Conve

rter

– c

onne

ctin

g th

e co

mpu

ter’s

RS2

32 p

ort t

o th

e M

TL48

40 S

erie

s' b

ackp

lane

RS4

85 c

onne

ctor

.

Inst

rum

ent

managem

ent

soft

ware

Gen

eral purp

ose

connec

tion u

nits

BP

HM

64

64 c

h H

ART

bac

kpla

ne

HA

RT in

terfa

ce c

onne

ctor

H

CU

16

HA

RT c

onne

ctio

n un

it N

o pa

ralle

l res

isto

r, 0

link

fitte

d in

ser

ies

H

CU

16-P

250

HA

RT c

onne

ctio

n un

it 25

0 p

aral

lel r

esis

tor,

0 li

nk fi

tted

in s

erie

s

HC

U16

-S20

0 H

ART

con

nect

ion

unit

No

para

llel r

esis

tor,

200

res

isto

r fit

ted

in s

erie

s

HC

U16

-S15

0 H

ART

con

nect

ion

unit

No

para

llel r

esis

tor,

150

res

isto

r fit

ted

in s

erie

s

HC

U16

AO

16

ch

HA

RT c

onne

ctio

n un

it W

ith H

ART

filte

rs

HM

U16

16

ch

HA

RT c

omm

unic

atio

n un

it M

TL4000 b

ack

pla

nes

BP

MH

16

16 c

h ba

ckpl

ane

Safe

-are

a m

ultiw

ay c

onne

ctor

BP

SH16

16

ch

back

plan

e Sa

fe-a

rea

scre

w-c

lam

p co

nnec

tor

BP

SH16

-32

32 c

h H

ART

bac

kpla

ne

BPM

H16

U

16 c

h H

ART

bac

kpla

ne

Requ

ires

back

plan

e ad

apte

r ca

rd (c

all M

TL fo

r

optio

ns)

Back

pla

ne

acc

esso

ries

ER

K18

Earth

rai

l kit

For

BPM

H16

and

BPS

H16

bac

kpla

nes

TS

K18

Tagg

ing

strip

kit

For

BPM

H16

and

BPS

H16

bac

kpla

nes

EL

C38

38

-way

Elc

o co

nnec

tor

For

BPM

H16

saf

e-ar

ea c

onne

ctio

n

FUS0

2 Fu

se k

it, p

ack

of 1

0 Pr

otec

ts M

TL48

41/4

842

FU

S16

Fuse

kit,

pac

k of

10

Prot

ects

back

plan

e m

odul

e po

sitio

ns 1

to 1

6

VMPH

16

Back

plan

e m

ount

ing

plat

e Fo

r D

IN-ra

il an

d no

n-m

etal

lic s

urfa

ce m

ount

ing

(B

PMH

16 a

nd B

PSH

16 o

nly)

D

MK0

1 D

IN-ra

il m

ount

ing

kit

DIN

-rail

mou

ntin

g kit

, T- o

r G-se

ction

(pac

k of

40)

16

-way

bac

kpla

nes

requ

ire 6

SM

S01

Surfa

ce m

ount

ing

kit

Pack

of 4

0 - 4

req

uire

d fo

r ea

ch b

ackp

lane

H

M64

RIB1

0-xx

Ri

bbon

Cab

le

10-w

ay

-xx

spec

ifies

the

cabl

e le

ngth

- m

ax 4

m

HM

64RI

B20-

xx

Ribb

on C

able

20

-way

-x

x sp

ecifi

es th

e ca

ble

leng

th -

max

4.5

mIs

ola

ting inte

rface

module

s and a

cces

sori

es

MTL

4041

A

Cur

rent

rep

eate

r 4/

20m

A, p

assi

ve in

put,

for

smar

t tra

nsm

itter

s

MTL

4041

B Re

peat

er p

ower

sup

ply

4/20

mA

, for

2- o

r 3-

wire

tran

smitt

ers

M

TL40

41P

Hig

h po

wer

rep

eate

r po

wer

sup

ply

4/20

mA

, for

2- o

r 3-

wire

tran

smitt

ers

M

TL40

44

Repe

ater

pow

er s

uppl

y 2c

h, 4

/20m

A, s

mar

t, fo

r 2-

wire

tran

smitt

ers

M

TL40

46

Isola

ting

driv

er

For

HA

RT v

alve

pos

ition

ers

M

TL40

46C

Iso

latin

g dr

iver

Fo

r H

ART

val

ve p

ositi

oner

s

MTL

4046

P H

igh

pow

er is

olat

ing

driv

er

For

HA

RT v

alve

pos

ition

ers

C

CH

01

Crim

p co

nnec

tor

head

er

CRC

01

Larg

e cr

imps

Pa

ck o

f 100

C

RC02

Sm

all c

rimps

Pa

ck o

f 100

SC

C01

Sc

rew

-cla

mp

conn

ecto

r

MPL

01

Mod

ule

posi

tion

labe

l, bl

ank

Pack

of 5

0

Lite

ratu

re

INM

4840

M

TL48

40 in

struc

tion

man

ual

Countr

y

US

Auth

ori

ty

FMSt

andard

C

lass

360

0, 3

611,

381

0

C

lass

1, D

iv 2

, Gps

ABC

DPro

duct

No.

Cer

tifi

cate

No.

MTL

4841

30

0914

9M

TL4842

30

0914

9H

CU

16

30

0914

9BPM

H64

30

0914

9

MTL

48

40

SER

IES

ORD

ERIN

G I

NFO

RM

ATI

ON

HARTA

PPRO

VA

LS -

for

the

late

st c

ertifi

cation info

rmation v

isit w

ww

.mtl-i

nst

.com

/support

/cer

tifi

cate

s

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

Zene

r Ba

rrie

rs

Our

ran

ge o

f sh

unt-

diod

e sa

fety

bar

riers

are

the

sim

ples

t ty

pe o

f IS

int

erfa

ce f

or p

rote

ctin

g el

ectr

ical

circ

uits

in

haza

rdou

s ar

eas.

The

com

pact

and

inex

pens

ive

units

are

mou

nted

and

ear

thed

in o

ne o

pera

tion,

ens

urin

g th

e sa

fest

po

ssib

le in

stal

latio

n w

ith u

ltra-

high

rel

iabi

lity.

The

MTL

7700

Ser

ies

has

an im

pres

sive

ped

igre

e an

d th

e us

er w

ill b

enef

it fr

om th

e ex

cept

iona

l app

licat

ion

know

ledg

e th

at M

TL h

as d

evel

oped

in th

is fi

eld.

Not

e th

at th

e w

ell k

now

n M

TL70

0 Se

ries

of b

usba

r m

ount

ed s

afet

y ba

rrie

rs c

ontin

ues

to b

e av

aila

ble.

For

det

ails

and

sp

ecifi

catio

n sh

eets

ple

ase

visi

t our

web

site

at h

ttp://

ww

w.m

tl-in

st.c

om

DIN

rail

mounting

safe

ty b

arr

iers

MTL

7700

SER

IES

Since

its

intr

oduct

ion

in

1984

the

MTL

700

Serie

s ba

rrie

r has

esta

blis

hed

itsel

f as

the

wor

ldw

ide

stand

ard

for

safe

ty b

arrie

rs.

Know

n fo

r its

qua

lity

and

relia

bilit

y, th

e M

TL70

0 Se

ries

is w

idel

y us

ed i

n ap

plic

atio

ns a

ll ov

er th

e w

orld

.

The

MTL

7700

Seri

es

follo

ws

clos

ely

in

the

foot

steps

of t

he M

TL70

0, b

ut a

s a

DIN

rai

l mou

ntin

g ba

rrie

r, pr

ovid

ing

quic

k an

d ea

sy in

stalla

tion

with

out

the

need

for

spec

ial h

ardw

are.

Rem

ova

ble

te

rmin

als

are

use

d f

or e

ase

of

insta

llatio

n, m

aint

enan

ce a

nd f

or p

rovi

ding

a l

oop

disc

onne

ct b

y si

mpl

y un

plug

ging

the

term

inal

s fro

m

the

side

of t

he m

odul

e. W

ire e

ntry

is a

lso a

ngle

d to

as

sist

wiri

ng w

ithin

lim

ited

spac

e en

clos

ures

.

MTL

7700 b

arr

iers

cla

mp s

imply

and

sec

urel

y on

to

stand

ard

T-sec

tion

DIN

ra

il,

sim

ulta

neou

sly

mak

ing

a re

liabl

e IS

ear

th c

onne

ctio

n.

For

applic

ations

wher

e fi

eld p

ow

er is

requ

ired

for s

witc

h in

puts

or 2

-wire

tran

smitt

ers,

the

MTL

7700

Se

ries

prov

ides

a b

usse

d po

wer

feed

faci

lity.

Whe

n us

ed i

n co

njun

ctio

n w

ith t

he M

TL77

98 p

ower

fee

d m

odul

e th

e us

er h

as a

ful

ly p

rote

cted

, el

ectro

nica

lly

fuse

d su

pply

to

man

y ba

rrie

rs w

ith n

o ad

ditio

nal

wiri

ng r

equi

red.

MTL

7700

act

ive

module

s ar

e pr

otec

ted

with

an

ele

ctro

nic

fuse

for

the

maj

ority

of

appl

icat

ions

. Th

e M

TL77

98 a

ctiv

e fu

sed,

pow

er fe

ed m

odul

e ca

n pr

otec

t up

to

40 o

ther

mod

ules

usi

ng t

he b

usse

d po

wer

fac

ility

and

pro

vide

s a

clea

r in

dica

tion

of a

tri

p co

nditi

on v

ia a

red

LED

.

The

MTL

774X

range

of b

arrie

rs o

ffer

a N

AM

UR

com

patib

le i

nput

and

a c

hoic

e of

rel

ay o

r so

lid

state

out

put.

The

solid

sta

te o

utpu

ts ar

e flo

atin

g so

sw

itchi

ng t

o gr

ound

or

from

a p

ower

rai

l in

to a

n in

put

is a

lso p

ossi

ble.

The

sol

id s

tate

int

erfa

ce a

lso

prov

ides

a h

igh

frequ

ency

tran

sfer

for

use

in fl

ow o

r ro

tatio

n ap

plic

atio

ns.

Dual

channel

re

lay or

solid

st

ate

mod

ules

of

fer

the

high

est

pack

ing

dens

ity w

ith o

nly

6.3m

m

per

chan

nel a

nd w

hen

used

in

conj

unct

ion

with

the

pow

er b

us,

offe

r us

ers

the

min

imum

of

wiri

ng w

ith

the

max

imum

pac

king

den

sity

and

the

low

est

cost

per

chan

nel.

•

Pro

xim

ity d

etec

tor

inputs

•

Elec

tronic

fusi

ng

•

Dir

ect

repla

cem

ent

for

M

TL700 S

erie

s barr

iers

•

Com

patib

le t

erm

inal n

umber

ing

and

safe

ty d

escr

iptio

ns

•

Rem

ova

ble

ter

min

als

•

Buss

ed p

ow

er f

eed t

o o

ther

module

s•

Rel

ay a

nd s

olid

sta

te

switch

module

s•

Dual ch

annel

vari

ants

—

6.3

mm

per

channel

8283

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

Model

N

o.

Safe

ty d

escr

iption

1Pola

rities

2

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ilable

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ation

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c ci

rcuit

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t 4

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33

32

6.6

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27

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07

78

7P+

2823

411

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253

26.4

27.2

8028

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+21

26.4

27.2

80

77

88

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300

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ansm

itter

s33

325

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1050

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6.0

7.0

50

77

88

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093

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325

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1050

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SPEC

IFIC

ATI

ON

S‘K

ey’

barr

iers

show

n in b

lue

For

note

s 1

to 7

see

'Ter

min

olo

gy' (

late

r in

this

sec

tion)

a Ter

min

als

3 &

7 c

onne

cted

toge

ther

* D

iagr

ams

show

pos

itive

ver

sion

s. A

ll di

odes

rev

erse

d on

neg

ativ

e ve

rsio

ns. A

dditi

onal

dio

des

fitte

d on

ac

vers

ions

.

{

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

GEN

ERA

L SP

ECIF

ICA

TIO

NA

mbie

nt

tem

per

atu

re a

nd h

um

idity lim

its

–20

to +

60°C

con

tinuo

us w

orki

ng–4

0 to

+80

°C s

tora

ge5–

95%

RH

Leak

age

curr

ent

For

‘bas

ic’ b

arrie

rs w

ith a

wor

king

vol

tage

of 5

V or

mor

e,

the

leak

age

curr

ent d

ecre

ases

by

at le

ast o

ne d

ecad

e pe

r vo

lt re

duct

ion

in a

pplie

d vo

ltage

bel

ow th

e w

orki

ng v

olta

ge, o

ver

two

deca

des.

For

the

MTL

7755

ac/7

756a

c it

decr

ease

s by

at

leas

t one

dec

ade

for

a 0.

4V r

educ

tion

in a

pplie

d vo

ltage

.

Term

inations

Rem

ovab

le te

rmin

als

acco

mm

odat

e co

nduc

tors

up

to 2

.5m

m2

(13A

WG

). H

azar

dous

-are

a te

rmin

als

are

iden

tifie

d by

blu

e la

bels.

Rem

oval

forc

e >1

5N

Colo

ur

codin

g o

f barr

ier

label

Gre

y:

non-

pola

rised

Red:

po

sitiv

e po

larit

y (M

TL77

06 n

egat

ive

to tr

ansm

itter

)Bl

ack:

ne

gativ

e po

larit

yW

hite

: du

mm

y ba

rrie

r, M

TL77

99

Wei

ght

140g

app

rox

Mounting a

nd e

art

hin

gBy

35m

m T

op H

at D

IN r

ail

DIM

ENSI

ON

S (M

M)

MTL

7700 S

ERIE

S K

EY B

ARRIE

RS

SUM

MA

RIS

ED

HO

W T

HEY

WO

RK

All

MTL

7700

Ser

ies

barr

iers

are

bas

ed o

n th

e sa

me

sim

ple

prin

cipl

e.

Each

cha

nnel

con

tain

s tw

o sta

ges

of p

ulse

-teste

d Ze

ner

or f

orw

ard-

conn

ecte

d di

odes

and

an

‘infa

llibl

e’ te

rmin

atin

g re

sisto

r. In

the

even

t of

an

elec

trica

l fa

ult

in t

he s

afe

area

, th

e di

odes

lim

it th

e vo

ltage

th

at c

an r

each

the

haza

rdou

s ar

ea a

nd th

e re

sisto

r lim

its th

e cu

rren

t. A

fus

e pr

otec

ts th

e di

odes

, an

d th

e tw

o sta

ges

of v

olta

ge l

imita

tion

ensu

re c

ontin

ued

safe

ty i

f ei

ther

sta

ge s

houl

d fa

il. N

o ac

tive

outp

ut-

curr

ent l

imiti

ng c

ircui

ts ar

e em

ploy

ed. A

ll m

odel

s ar

e ce

rtifie

d ‘ia

’ for

al

l zon

es a

nd ‘I

IC’ f

or a

ll ex

plos

ive

atm

osph

eres

(exc

ept M

TL77

07P+

an

d M

TL77

29P+

, 'ia

' 'IIB

').

TER

MIN

OLO

GY

1.

Safe

ty d

escr

iption

The

safe

ty d

escr

iptio

n of

a b

arrie

r, eg

‘10V

50

200

mA’

, ref

ers

to th

e m

axim

um v

olta

ge o

f the

term

inat

ing

Zene

r or f

orw

ard

diod

e w

hile

the

fuse

is b

low

ing,

the

min

imum

val

ue o

f the

term

inat

ing

resi

stor,

and

the

corr

espo

ndin

g m

axim

um s

hort-

circ

uit c

urre

nt. I

t is

an in

dica

tion

of th

e fa

ult e

nerg

y th

at c

an b

e de

velo

ped

in th

e ha

zard

ous

area

, and

not

of

the

wor

king

vol

tage

or

end-

to-e

nd r

esis

tanc

e.

2.

Pola

rity

Barr

iers

may

be

pola

rised

+ o

r –,

or

non-

pola

rised

(‘a

c’).

Pola

rised

ba

rrie

rs a

ccep

t an

d/or

del

iver

saf

e-ar

ea v

olta

ges

of t

he s

peci

fied

pola

rity

only.

N

on-p

olar

ised

ba

rrie

rs

supp

ort

volta

ges

of

eith

er

pola

rity

appl

ied

at e

ither

end

.

3.

End-t

o-e

nd r

esis

tance

The

resi

stanc

e be

twee

n th

e tw

o en

ds o

f a b

arrie

r ch

anne

l at 2

0°C

, ie

of th

e re

sisto

rs a

nd th

e fu

se.

If di

odes

or

trans

isto

rs a

re p

rese

nt,

thei

r vo

ltage

dro

p (tr

ansi

stors

ON

) is

quot

ed in

add

ition

.

4.

Work

ing v

oltage

(Vw

kg)

The

grea

test

stead

y vo

ltage

, of

app

ropr

iate

pol

arity

, th

at c

an b

e ap

plie

d be

twee

n th

e sa

fe-a

rea

term

inal

of

a ‘b

asic

’ ba

rrie

r ch

anne

l an

d ea

rth

at

20°C

fo

r th

e sp

ecifi

ed

leak

age

curr

ent,

with

th

e ha

zard

ous-a

rea

term

inal

ope

n ci

rcui

t.

5.

Max

imum

voltage

(Vm

ax

)Th

e gr

eate

st ste

ady

volta

ge,

of a

ppro

pria

te p

olar

ity,

that

can

be

appl

ied

cont

inuo

usly

bet

wee

n th

e sa

fe-a

rea

term

inal

of

any

barr

ier

chan

nel

and

earth

at

20°C

with

out

blow

ing

the

fuse

. Fo

r ‘b

asic

’ ba

rrie

rs, i

t is

spec

ified

with

the

haza

rdou

s-are

a te

rmin

al o

pen

circ

uit;

if cu

rren

t is

draw

n in

the

haza

rdou

s ar

ea,

the

max

imum

vol

tage

for

th

ese

barr

iers

is

redu

ced.

The

‘ac

’ ch

anne

ls of

‘ba

sic’

bar

riers

and

m

ost c

hann

els

of o

verv

olt-p

rote

cted

bar

riers

with

stand

vol

tage

s of

the

oppo

site

pol

arity

also

– s

ee c

ircui

t dia

gram

s.

6.

Fuse

rating

The

grea

test

curr

ent t

hat c

an b

e pa

ssed

con

tinuo

usly

(for

100

0 ho

urs

at 3

5°C

) thr

ough

the

fuse

.

7.

Star

connec

tion

In s

tar-c

onne

cted

bar

riers

, th

e tw

o ch

anne

ls ar

e in

terlo

cked

suc

h th

at

the

volta

ge b

etw

een

them

can

not e

xcee

d th

e w

orki

ng v

olta

ge, V

wkg

: th

is a

llow

s fo

r hi

gher

cab

le c

apac

itanc

e or

indu

ctan

ce.

8.

Max

imum

safe

-are

a v

oltage

(Um)

The

max

imum

per

mis

sibl

e sa

fe-a

rea

volta

ge (U

m) f

or M

TL77

00 S

erie

s ba

rrie

rs is

250

V ac

/dc.

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Resi

stanc

e te

mpe

ratu

re d

etec

tors

Ther

moc

oupl

es, a

c se

nsor

s7

75

6ac

77

60

ac

Ana

logu

ein

put (

high

-le

vel)

Tran

smitt

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2-w

ire, 4

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A7

70

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77

87

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logu

eou

tput

Con

trolle

r ou

tput

s, o

ne li

ne e

arth

edC

ontro

ller

outp

uts,

nei

ther

line

ear

thed

77

28

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78

7+

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ital (

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put

Switc

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77

87

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on/o

ff)ou

tput

Sole

noid

s, a

larm

s, L

EDs

77

28

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EL

EC

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LLY

PR

OT

EC

TE

D B

AR

RIE

RS

ACT

IVE

/ EL

ECTR

ON

ICA

LLY P

ROTE

CTED

BA

RRIE

RS

The

follo

win

g ba

rrie

rs h

ave

built

-in o

verv

olt p

rote

ctio

n, a

llow

ing

thei

r us

e w

ith u

nreg

ulat

ed p

ower

sup

plie

s. In

man

y ap

plic

atio

ns, e

g, s

enso

r in

puts

or c

ontro

ller

outp

uts,

the

re i

s in

suffi

cien

t po

wer

ava

ilabl

e to

bl

ow th

e ba

rrie

r fu

se a

nd th

is a

dditi

onal

pro

tect

ion

is n

ot n

eces

sary

. H

owev

er,

whe

re th

e ba

rrie

r is

con

nect

ed to

a p

ower

sup

ply,

eg,

for

en

ergi

sing

tra

nsm

itter

s, s

witc

hes,

sol

enoi

ds o

r lo

cal a

larm

s, o

verv

olt

prot

ectio

n al

low

s th

e ba

rrie

rs t

o be

use

d w

ith u

nreg

ulat

ed s

uppl

ies

and

also

giv

es p

rote

ctio

n ag

ains

t fau

lty w

iring

dur

ing

com

mis

sion

ing.

MTL

7706

+ fo

r 'sm

art'

2-w

ire

4/20

mA

tran

smitt

ers

The

MTL

7706

+ is

a 1

-cha

nnel

shu

nt-d

iode

saf

ety

barr

ier,

with

bui

lt-in

ele

ctro

nic

over

volt

prot

ectio

n, f

or e

nerg

isin

g a

2-w

ire,

4/20

mA

tra

nsm

itter

in a

haz

ardo

us a

rea.

It is

pow

ered

from

a p

ositi

ve s

uppl

y of

20–

35V

dc a

nd d

eliv

ers

a 4/

20m

A s

igna

l in

to a

n ea

rthed

loa

d in

the

saf

e ar

ea.

It is

pro

of a

gain

st sh

ort

circ

uits

in t

he f

ield

and

in

the

saf

e ar

ea a

nd i

s ex

trem

ely

accu

rate

. Th

e M

TL77

06+

will

pa

ss i

ncom

ing

com

mun

icat

ion

sign

als

up t

o 10

kHz

from

a ‘

smar

t’ tra

nsm

itter

, w

hile

in th

e ou

tgoi

ng d

irect

ion

it w

ill p

ass

sign

als

of a

ny

frequ

ency

like

ly to

be

enco

unte

red.

Sinc

e th

e M

TL77

06+

has

no r

etur

n ch

anne

l for

ene

rgis

ing

the

load

, th

e en

tire

outp

ut o

f the

sin

gle

‘28V

’ cha

nnel

is a

vaila

ble

to p

ower

the

trans

mitt

er, p

rovi

ding

hig

h ou

tput

cap

abili

ty. T

his

chan

nel i

s ne

gativ

ely

pola

rised

, an

d th

e sa

fe-a

rea

sign

al i

s in

fac

t th

e ve

ry c

urre

nt t

hat

retu

rns

thro

ugh

it fro

m t

he h

azar

dous

are

a, t

he n

ovel

circ

uit

bein

g en

ergi

sed

by a

bui

lt-in

flo

atin

g dc

sup

ply

deriv

ed f

rom

the

ext

erna

l dc

sou

rce

of p

ower

.

To p

reve

nt a

ny le

akag

e th

roug

h th

e ze

ner

diod

es a

nd m

axim

ise

the

outp

ut v

olta

ge a

vaila

ble

at 2

0mA

, the

floa

ting

supp

ly is

giv

en a

risi

ng

volta

ge/c

urre

nt c

hara

cter

istic

. A

sep

arat

e ci

rcui

t lim

its th

e cu

rren

t to

prot

ect t

he fu

se in

the

even

t of a

sho

rt ci

rcui

t in

the

haza

rdou

s ar

ea.

With

a 2

0V s

uppl

y, th

e ba

rrie

r w

ill d

eliv

er 1

6.2V

min

imum

at 2

0mA

fo

r th

e tra

nsm

itter

and

lin

es a

nd c

onsu

mes

typ

ical

ly 4

5mA

at

24V

oper

atio

n.

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Safe

ty d

escr

iption

28V

300

93m

ASu

pply

voltage

20 to

35V

dc

w.r.

t ear

thO

utp

ut

curr

ent

4 to

20

mA

Voltage

ava

ilable

to t

ransm

itte

r and lin

es16

.2V

@ 2

0mA

with

250

load

(neg

ativ

e w

.r.t.

earth

)11

.0V

@ 2

0mA

with

500

load

(neg

ativ

e w

.r.t.

earth

)

Acc

ura

cy±2

μA u

nder

all

cond

ition

sSa

fe-a

rea load r

esis

tance

0 to

500

Supply

curr

ent

45m

A ty

pica

l at 2

0mA

and

24V

sup

ply

60m

A m

axim

um a

t 20m

A a

nd 2

0V s

uppl

y

MTL

7707

+ FO

R SW

ITCH

INPU

TS A

ND

SW

ITCH

ED O

UTP

UTS

The

MTL

7707

+ is

a 2

-cha

nnel

shu

nt-d

iode

saf

ety

barr

ier

sim

ilar

to t

he M

TL77

87+

but

with

bui

lt-in

ele

ctro

nic

over

volt

prot

ectio

n.

It is

int

ende

d pr

imar

ily f

or s

afeg

uard

ing

a ha

zard

ous-a

rea

switc

h co

ntro

lling

a r

elay

, op

to-c

oupl

er o

r ot

her

safe

-are

a lo

ad f

rom

an

unre

gula

ted

dc s

uppl

y in

the

safe

are

a.

The

outg

oing

cha

nnel

acc

epts

supp

ly v

olta

ges

up t

o +3

5V a

nd i

s pr

otec

ted

agai

nst

reve

rse

volta

ges:

the

ret

urn

chan

nel

is u

naffe

cted

by

vol

tage

s up

to +

250V

.

In n

orm

al o

pera

tion

the

prot

ectio

n ci

rcui

t in

trodu

ces

only

a s

mal

l vo

ltage

dro

p an

d sh

unts

less

than

1m

A to

ear

th,

so i

ts ov

eral

l effe

ct

is

min

imal

. If

the

supp

ly

volta

ge

exce

eds

abou

t 27

V,

how

ever

, ca

usin

g th

e Ze

ner

diod

es t

o co

nduc

t –

or i

f th

e sa

fe-a

rea

load

has

a

very

low

res

ista

nce

– th

e su

pply

cur

rent

is li

mite

d au

tom

atic

ally

to

50m

A,

prot

ectin

g th

e fu

se a

nd p

ower

sup

ply

and

enab

ling

the

loop

to

con

tinue

wor

king

.

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Safe

ty d

escr

iption

28V

300

93m

A, t

erm

inal

s 1

to 3

28V

Dio

de, t

erm

inal

s 2

-4Su

pply

voltage

10 to

35V

dc

with

res

pect

to e

arth

Outp

ut

curr

ent

Up

to 3

5mA

ava

ilabl

eM

ax

imum

voltage

dro

p

(at

20ºC

, cu

rren

t not

limited

)Io

ut x

345

+ 0.

3V, t

erm

inal

s 1

to 3

Iout

x 2

5+

0.9V

, ter

min

als

4 to

2Su

pply

curr

ent

Iout

+ 1

.6m

A, s

uppl

y <2

6VLim

ited

to 5

0mA

, sup

ply

>28V

or

low

load

res

ista

nce

MTL

7707P+ F

OR S

WIT

CH

IN

PU

TS A

ND

SWIT

CH

ED O

UTP

UTS

, 2W

TRA

NSM

ITTE

RS

(IIB

GA

SES)

The

MTL

7707

P+ i

s a

two-

chan

nel

shun

t-dio

de s

afet

y ba

rrie

r si

mila

r to

the

MTL

7787

P+,

but

is d

esig

ned

for

use

with

gro

up I

IB g

ases

an

d fe

atur

es b

uilt-

in e

lect

roni

c ov

ervo

lt pr

otec

tion

allo

win

g us

e w

ith

unre

gula

ted

pow

er s

uppl

ies

up to

35V

dc.

It is

inte

nded

prim

arily

as

a lo

w c

ost s

olut

ion

for

driv

ing

IIB c

ertif

ied

2-w

ire 4

/20m

A tr

ansm

itter

s,

but c

an a

lso b

e us

ed w

ith c

ontro

ller

outp

uts

with

cur

rent

mon

itorin

g,

sole

noid

val

ves

and

switc

hes.

To

prot

ect t

he fu

se a

nd e

nabl

e th

e lo

op

to c

ontin

ue w

orki

ng,

the

supp

ly c

urre

nt i

s lim

ited

auto

mat

ical

ly a

t 50

mA

sho

uld

the

outp

ut b

e sh

ort-c

ircui

ted

or e

xces

s vo

ltage

app

lied.

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opm

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chan

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.

MTL

7742 P

RO

XIM

ITY

SEN

SOR O

R S

WIT

CH

INPU

T W

ITH

SO

LID

STA

TE O

UTP

UT

The

MTL

7742

is a

sin

gle

chan

nel s

witc

h/pr

ox in

put b

arrie

r w

ith a

n op

en c

olle

ctor

sol

id s

tate

int

erfa

ce t

o th

e sa

fe a

rea

equi

pmen

t. Th

e so

lid s

tate

sw

itch

is e

spec

ially

use

ful

for

high

fre

quen

cy s

witc

hing

ap

para

tus

incl

udin

g pu

lse a

nd r

otat

iona

l se

nsor

s. T

he p

ower

bus

te

rmin

al c

an b

e us

ed t

o co

nnec

t po

wer

to

the

mod

ule

and

the

inpu

t po

wer

sup

ply

rang

e m

akes

the

mod

ule

suita

ble

for

use

with

un

regu

late

d su

pplie

s.

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Safe

ty d

escr

iption

10V

19m

ASu

pply

voltage

20 to

35V

dc

with

res

pect

to e

arth

Input

chara

cter

istics

Out

put e

nerg

ised

if in

put >

2.1m

A(<

2k)

Out

put d

e-en

ergi

sed

if in

put <

1.2m

A(>

10k

)O

utp

ut

chara

cter

istics

Ope

ratin

g fre

quen

cy

dc to

2.5

kHz

Max

off-

state

vol

tage

35

VM

ax o

ff-sta

te le

akag

e 10

μAM

ax o

n-sta

te v

olta

ge d

rop

<1.4

1V @

50m

A

<1.2

2V @

2m

A

typi

cally

<1V

M

ax o

n-sta

te c

urre

nt

50m

ASu

pply

curr

ent

20m

A m

axim

um @

24V

MTL

7743 2

CH

AN

NEL

PRO

XIM

ITY

SEN

SOR

OR S

WIT

CH

IN

PU

T A

ND

REL

AY

OU

TPU

TSTh

e M

TL77

43 is

a d

ual c

hann

el s

witc

h/pr

ox s

enso

r inp

ut b

arrie

r with

a

rela

y in

terfa

ce.

This

mod

ule

is i

deal

for

app

licat

ions

whe

re h

igh

chan

nel

pack

ing

dens

ities

are

req

uire

d fo

r di

gita

l in

puts.

Pow

er i

s co

nnec

ted

usin

g th

e po

wer

bus

term

inal

.

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Safe

ty d

escr

iption

10V

19m

ASu

pply

voltage

22.9

to 3

0V d

c w

ith r

espe

ct to

ear

thIn

put

chara

cter

istics

Rela

y en

ergi

sed

if in

put >

2.1m

A(<

2k)

Rela

y de

-ene

rgis

ed if

inpu

t <1.

2mA

(>10

k)

Rel

ay C

onta

cts

50V

ac 0

.5A

. Re

sisti

ve30

V dc

, 1A

. Re

sisti

veSu

pply

curr

ent

45m

A m

axim

um @

24V

Res

ponse

tim

e <1

0ms

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Safe

ty d

escr

iption

28V

164

171

mA

, ter

min

als

1 to

328

V D

iode

, ter

min

als

4 to

2Su

pply

voltage

10 to

35V

dc

with

res

pect

to e

arth

Outp

ut

curr

ent

Up

to 3

5mA

ava

ilabl

eM

ax

imum

voltage

dro

p(a

t 20ºC

, cu

rren

t not

limited

)Io

ut x

218

+ 0.

3V, t

erm

inal

s 1

to 3

Iout

x 2

0.1

+ 0.

9V, t

erm

inal

s 4

to 2

Supply

curr

ent

Iout

+ 1

.6m

A, s

uppl

y <2

6VLim

ited

to 5

0mA

, sup

ply

>28V

or

low

load

res

ista

nce

MTL

7741 P

RO

XIM

ITY

SEN

SOR O

R S

WIT

CH

INPU

T A

ND

REL

AY

OU

TPU

TTh

e M

TL77

41 i

s a

sing

le c

hann

el s

witc

h/pr

ox i

nput

bar

rier

with

ch

ange

over

rel

ay c

onta

cts

actin

g as

the

saf

e ar

ea i

nter

face

. Re

lay

cont

acts

prov

ide

a un

iver

sal

inte

rface

cap

able

of

switc

hing

a w

ide

rang

e of

sig

nals

incl

udin

g ac

, lo

w l

evel

and

hig

h le

vel

volta

ges.

Ph

ase

reve

rsal

is

achi

eved

by

conn

ectin

g th

e no

rmal

ly o

pen

or

norm

ally

clo

sed

cont

acts

as r

equi

red.

The

pow

er b

us t

erm

inal

may

be

use

d to

con

nect

the

mod

ule

to a

pow

er s

ourc

e.

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Safe

ty d

escr

iption

10V

19m

ASu

pply

voltage

22.9

to 3

0V d

c w

ith r

espe

ct to

ear

thIn

put

chara

cter

istics

Rela

y en

ergi

sed

if in

put >

2.1m

A(<

2k)

Rela

y de

-ene

rgis

ed if

inpu

t <1.

2mA

(>10

k)

Rel

ay C

onta

cts

50V

ac 0

.5A

. Re

sisti

ve30

V dc

, 1A

. Re

sisti

ve

Supply

curr

ent

26m

A m

axim

um @

24V

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ponse

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R

SWIT

CH

IN

PU

TS W

ITH

SO

LID

STA

TE O

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UTS

A d

ual c

hann

el v

ersi

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f th

e M

TL77

42.

This

mod

ule

prov

ides

tw

o so

lid s

tate

inte

rface

s fo

r pr

ox/s

witc

h in

puts.

Pow

er is

con

nect

ed v

ia

the

pow

er b

us.

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Safe

ty d

escr

iption

10V

19m

A10

V 19

mA

Supply

voltage

20 to

35V

dc

with

res

pect

to e

arth

Input

chara

cter

istics

Out

put e

nerg

ised

if in

put >

2.1m

A(<

2k)

Out

put d

e-en

ergi

sed

if in

put <

1.2m

A(>

10k

)O

utp

ut

chara

cter

istics

Ope

ratin

g fre

quen

cy

dc to

2.5

kHz

Max

off-

state

vol

tage

35

VM

ax o

ff-sta

te le

akag

e 10

μAM

ax o

n-sta

te v

olta

ge d

rop

1.41

V @

50m

A

1.22

V @

2m

A

typi

cally

<1V

Max

on-

state

cur

rent

50

mA

Supply

curr

ent

29m

A m

axim

um @

24V

MTL

7745

PRO

XIM

ITY

SEN

SOR O

R S

WIT

CH

IN

PU

T W

ITH

REL

AY

OU

TPU

T A

ND

LIN

E FA

ULT

DET

ECT

The

MTL

7745

is a

sin

gle

chan

nel s

witc

h/pr

ox in

put b

arrie

r pro

vidi

ng

line

faul

t det

ectio

n. P

roxi

mity

det

ecto

rs o

r sw

itche

s fit

ted

with

end

-of-

line

resi

stors

may

be

conn

ecte

d. S

hort

circ

uit o

r ope

n ci

ruit

cond

ition

s in

the

fie

ld w

iring

will

gen

erat

e an

ala

rm c

ondi

tion.

The

LFD

rel

ay

cont

acts

clos

e w

hen

a fa

ult

is d

etec

ted

allo

win

g th

e co

ntac

ts to

be

conn

ecte

d in

par

alle

l to

pro

vide

a c

omm

on a

larm

. Th

e po

wer

bus

te

rmin

al c

an b

e us

ed to

con

nect

pow

er to

this

mod

ule.

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Safe

ty d

escr

iption

10V

19m

ASu

pply

voltage

22.9

to 3

0V d

c w

ith r

espe

ct to

ear

thIn

put

chara

cter

istics

Out

put e

nerg

ised

if in

put >

2.1m

A(<

2k)

Out

put d

e-en

ergi

sed

if in

put <

1.2m

A(>

10k

)LF

D r

elay +

Red

LED

Ener

gise

d if

inpu

t <50

A o

r <1

00Rel

ay c

onta

cts

50V

ac 0

.5A

. Re

sisti

ve30

V dc

, 1A

. Re

sisti

veSu

pply

curr

ent

38m

A m

axim

um @

24V

Res

ponse

tim

e <1

0ms

MTL

7798 P

OW

ER F

EED

AN

D P

RO

TECTI

ON

MO

DU

LE

The

MTL

7798

pow

er f

eed

mod

ule

inco

rpor

ates

bot

h vo

ltage

and

cu

rren

t se

nse

mec

hani

sms

to p

rote

ct b

arrie

r ci

rcui

ts by

act

ivat

ing

a so

lid s

tate

trip

mec

hani

sm w

hen

faul

t or

ove

rload

con

ditio

ns o

ccur

in

the

pow

er s

ourc

e ci

rcui

t. Re

setti

ng t

he m

odul

e af

ter

tripp

ing

is

achi

eved

by

inte

rupt

ing

the

supp

ly to

the

unit.

A r

ed L

ED in

dica

tes

a ci

rcui

t trip

con

ditio

n an

d a

gree

n LE

D th

e av

aila

bilit

y of

pow

er a

t the

ou

tput

s. B

usse

d po

wer

for

oth

er m

odul

es i

s so

urce

d fro

m th

e to

p of

th

e un

it us

ing

the

Bus

Pow

er L

ink

BPL7

700

or v

ia te

rmin

als

1 an

d 2.

BA

SIC C

IRCU

IT

AD

DIT

ION

AL

SPEC

IFIC

ATI

ON

Input

voltage

range

(ter

min

als

5&

6)

20 to

26.

8VM

ax

imum

input

voltage

capabili

ty45

VPow

er s

ourc

e re

quir

emen

ts>1

.8A

Trip

mec

hanis

mM

inim

um tr

ip 2

6.8V

@ 2

0°C

(+18

mV/

°C)

Outp

ut

curr

ent

range

0 to

800

mA

Max

imum

voltage

dro

p20

mV

@ 0

mA

, 1.0

V @

800

mA

load

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as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

MTL

7700

Ser

ies

barr

iers

pro

tect

dev

ices

loc

ated

in

all

norm

ally

oc

curr

ing

expl

osiv

e at

mos

pher

es,

incl

udin

g ai

r/fla

mm

able

ga

s m

ixtu

res,

du

sts

and

fibre

s.

App

licat

ions

co

vere

d in

clud

e th

e pr

otec

tion

of i

nsta

llatio

ns i

ncor

pora

ting

unce

rtifie

d de

vice

s (‘s

impl

e ap

para

tus’

) su

ch a

s th

erm

ocou

ples

, sw

itche

s an

d re

sisti

ve s

enso

rs,

or s

epar

atel

y ce

rtifie

d ‘e

nerg

y sto

ring’

(o

r ‘v

olta

ge p

rodu

cing

’) ap

para

tus

incl

udin

g ac

sen

sors

, tra

nsm

itter

s an

d cu

rren

t-to-

pneu

mat

ic

(I/P)

con

verte

rs.

Reco

mm

ende

d ch

oice

s fo

r sp

ecifi

c ap

plic

atio

ns a

re

disc

usse

d br

iefly

in th

e fo

llow

ing

page

s.

MT

L77

00 S

ER

IES

BA

RR

IER

A

PP

LIC

ATIO

NS

AN

ALO

GU

E IN

PU

TS (

HIG

H L

EVEL

)2

-wir

e tr

ansm

itte

rs,

4/2

0m

A,

conve

ntional and s

mart

The

reco

mm

ende

d ba

rrie

r fo

r us

e w

ith '

conv

entio

nal'

and

'sm

art'

4/20

mA

tra

nsm

itter

s (fe

d by

a

26V

regu

late

d su

pply

) is

th

e M

TL77

87+.

Thi

s pr

ovid

es u

p to

12.

9V (

14.6

V fo

r M

TL77

87P+

) at

Vw

kg a

nd 2

0mA

for

a tra

nsm

itter

and

its

lines

as

wel

l as

5V fo

r th

e ty

pica

l 250

load

. Thi

s ap

plic

atio

n an

d th

is b

arrie

r is

suita

ble

for u

se

with

the

optio

nal p

ower

bus

faci

lity.

The

MTL

7706

+ is

re

com

men

ded

for

appl

icat

ions

w

here

an

un

regu

late

d su

pply

of

up t

o 35

V is

use

d. I

t pr

ovid

es 1

6.0V

for

co

nven

tiona

l an

d Sm

art

trans

mitt

ers

at 2

0mA

, as

wel

l as

5V

for

a ty

pica

l 250

load

. W

ith th

e M

TL77

06+

term

inal

3 is

neg

ativ

e w

ith

resp

ect t

o ea

rth,

so th

e co

nnec

tions

to te

rmin

als

3 an

d 4

shou

ld b

e re

vers

ed.

AN

ALO

GU

E IN

PU

TS (

LOW

-LEV

EL)

Ther

moco

uple

s and m

V s

ourc

esTh

e re

com

men

ded

barr

ier

for

ther

moc

oupl

es a

nd m

V so

urce

s is

the

MTL

7760

ac.

This

2-c

hann

el n

on-p

olar

ised

bar

rier

reta

ins

the

‘ear

th-

free’

nat

ure

of th

e si

gnal

and

, pr

ovid

ing

the

rece

iver

’s in

put ‘

float

s’,

reje

cts

com

mon

-mod

e ac

and

dc

inte

rfere

nce

up to

at l

east

7V a

nd is

un

affe

cted

by

earth

faul

ts on

the

prim

ary

elem

ent.

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3 4

1 2M

TL7760ac

Earth

free

sign

al

Phot

ocel

lM

icro

phon

eTu

rbin

eFl

owm

eter

+6.0

V3 4

1 2M

TL7760ac

V out

0V

3 4

1 2M

TL7796-

Pow

er -2

4V

V out

0V

Prob

edr

iver

Tran

sduc

er

Mon

itor

3 4

1 2M

TL7788R+

250Ω

1-5V

Pow

er +

26V

Pow

er B

us

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Haza

rdous

Are

aSa

feA

rea

Vib

ration p

robes

The

3-w

ire t

rans

mitt

ers

used

with

vib

ratio

n m

onito

ring

equi

pmen

t ar

e in

varia

bly

supp

lied

by a

–24

V dc

pow

er s

uppl

y –

henc

e th

e re

com

men

ded

barr

ier

choi

ce is

the

nega

tivel

y-po

laris

ed M

TL77

96–.

Slid

ewir

e dis

pla

cem

ent

transd

uce

rsTh

e si

mpl

est

choi

ce i

s th

e M

TL77

60ac

. Th

is b

arrie

r su

pplie

s po

wer

an

d br

ings

bac

k a

unip

olar

sig

nal.

AC

sens

ors,

pho

toce

lls, m

icro

phon

es a

nd tu

rbin

e flo

wm

eter

sTh

e M

TL77

60ac

is th

e re

com

men

ded

choi

ce fo

r the

se d

evic

es. W

hile

m

any

of t

hese

are

des

igna

ted

‘sim

ple

appa

ratu

s’ a

nd t

hus

do n

ot

need

cer

tific

atio

n, n

ote

that

som

e ac

sen

sors

may

be

subj

ect

to a

si

gnifi

cant

leve

l of i

nduc

tanc

e an

d w

ill th

eref

ore

need

to b

e de

sign

ed

and

certi

fied

for

haza

rdou

s-are

a lo

catio

ns.

8889

RTD

sFo

r 3-

wire

RTD

s, a

sin

gle

MTL

7755

ac b

arrie

r is

the

mos

t eco

nom

ical

ch

oice

. Thi

s is

sui

tabl

e fo

r us

e w

ith a

floa

ting

brid

ge –

the

two

lead

s fro

m t

he b

ridge

arm

s ar

e pr

otec

ted

by t

he b

arrie

r w

ith t

he t

hird

(s

uppl

y) le

ad b

eing

ear

thed

thro

ugh

the

barr

ier.

The

barr

ier h

as a

low

en

d-to

-end

resi

stanc

e of

onl

y 19

/cha

nnel

to m

inim

ise

span

cha

nges

an

d its

cha

nnel

s tra

ck w

ithin

0.1

5 (b

etw

een

–20°

C a

nd +

60°C

) to

min

imis

e ze

ro s

hift

with

tem

pera

ture

.

STRA

IN-G

AU

GE

BRID

GES

Single

str

ain

-gauge

bri

dges

This

sho

ws

an a

rran

gem

ent u

sing

two

or th

ree

barr

iers

, whi

ch is

saf

e in

IIC

gas

es.

With

the

MTL

7761

ac,

the

circ

uit

is p

ower

ed f

rom

a

14V,

230

sou

rce;

if th

e br

idge

res

ista

nce

is 2

30, t

hen

the

brid

ge

volta

ge i

s 7V

. If

the

brid

ge r

esis

tanc

e is

350

, th

en t

he b

ridge

vo

ltage

is 8

.4V.

An

MTL

7764

ac c

an b

e us

ed to

sen

se th

e br

idge

sup

ply

volta

ge.

An

MTL

7761

ac is

use

d he

re fo

r th

e m

V ou

tput

.

An

MTL

7766

Pac

prov

ides

12.

3V f

or a

350

brid

ge w

ith a

20V

su

pply.

MTL

7761

Pac'

s ca

n be

use

d fo

r the

sen

se a

nd p

ick-

off c

ircui

ts.

Haza

rdous

Are

aSa

feA

rea

3 4

1 2M

TL7756ac

Rece

iver

75

3 4

1 2M

TL7755ac

Rece

iver

3 4

1 2

Rece

iver

3 4

1 2M

TL7

75

5ac

MTL

77

61

ac

MTL

77

55

ac

MTL

77

61

ac

4-w

ire c

onsta

nt-c

urre

nt c

ircui

ts do

not

nee

d m

atch

ed b

arrie

r res

ista

nces

an

d ca

n be

pro

tect

ed b

y tw

o M

TL77

61ac

bar

riers

. If t

he in

crea

se in

lo

op r

esis

tanc

e is

too

grea

t, us

e tw

o M

TL77

55ac

bar

riers

inste

ad.

If th

e br

idge

circ

uit

is a

lread

y ea

rthed

, th

e th

ird b

arrie

r ch

anne

l pr

ovid

ed b

y an

MTL

7756

ac i

s ne

eded

. Fo

r ex

trem

e ac

cura

cy,

3 ch

anne

ls an

d an

ear

th-fr

ee b

ridge

can

be

used

, a c

onfig

urat

ion

that

ca

ncel

s ou

t the

sm

all e

rror

s du

e to

bar

rier

leak

age.

Cha

nnel

s 1

and

2 (th

ose

betw

een

term

inal

s 1

& 2

and

3 &

4

resp

ectiv

ely)

trac

k to

with

in 0

.15

(bet

wee

n –2

0°C

and

60°

C).

3 4

1 2

+7V

3 4

1 2M

TL7

76

1ac

MTL

77

64

ac

3 4

1 2M

TL7

76

1ac

--7V

0V

Out

put (

mV)

Sens

e+ —

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

STRA

IN-G

AU

GE

BRID

GES

(CO

NT)

Double

str

ain

-gauge

bri

dges

Qui

te fr

eque

ntly

ther

e is

a d

eman

d to

mon

itor

two

load

cel

ls, a

nd a

po

ssib

le c

ircui

t, sa

fe in

IIC

, is

show

n.

Her

e, th

e lo

wer

vol

tage

dro

p of

the

MTL

7766

Pac

is a

n ad

vant

age.

The

MTL

7766

Pac

supp

lies

pow

er

to

the

brid

ge(s

) w

hile

tw

o M

TL77

61Pa

c ba

rrie

rs in

terfa

ce w

ith th

e se

nse

and

pick

-off

circ

uits.

Usi

ng 3

50 b

ridge

sys

tem

s, t

he f

ollo

win

g vo

ltage

s ar

e av

aila

ble

from

an

MTL

7766

Pac

with

a ±

10V

supp

ly:

1

brid

ge:

13.1

1V

2

brid

ges:

9.

75V

AN

ALO

GU

E O

UTP

UTS

Contr

olle

r outp

uts

(I/

P c

onve

rter

s)Th

e si

ngle

-cha

nnel

MTL

7728

+ w

ith a

vol

tage

dro

p of

6.6

6V a

t 20m

A

is th

e re

com

men

ded

choi

ce fo

r m

ost c

ontro

ller

outp

uts.

Hig

her-p

ower

ve

rsio

ns a

re a

vaila

ble:

the

MTL

7728

P+ (

5.1V

dro

p) i

s su

itabl

e fo

r IIC

app

licat

ions

; the

MTL

7729

P+ (3

.68V

dro

p) fo

r IIB

app

licat

ions

.

Haza

rdous

Are

aSa

feA

rea

3 4

1 2

+10V

3 4

1 2M

TL7766Pac

MTL

77

61

Pac

3 4

1 2M

TL7761Pac

--10V

0V

Sens

e+ —

Out

put (

mV)

3 4

1 2M

TL7

72

8+

��8� �

�-

3 4

1 2M

TL7

78

7+

MTL

7787P+

��8� �

�-

3 4

1 2M

TL7

78

7+

MTL

77

87

P+

�-

����5�

2��5��

8� �

The

MTL

7787

+ an

d M

TL77

87P+

are

also

sui

tabl

e fo

r co

ntro

llers

co

ntai

ning

a re

sisto

r whi

ch e

nabl

es th

e re

turn

cur

rent

to b

e m

onito

red

for

high

-inte

grity

ope

ratio

n.

For c

ontro

llers

with

an

outp

ut c

ircui

t sep

arat

ed fr

om th

e 0V

rail

by th

e co

ntro

l tra

nsis

tor,

the

2-ch

anne

l MTL

7787

+ is

the

pref

erre

d ch

oice

as

the

retu

rn c

hann

el c

an h

andl

e up

to 2

6.6V

allo

win

g th

e co

ntro

l sig

nal

to b

e tu

rned

off

com

plet

ely.

The

vol

tage

dro

p is

8.1

V at

20m

A.

A

high

er-p

ower

ver

sion

of t

he la

tter,

the

MTL

7787

P+, i

s al

so a

vaila

ble.

Th

e re

turn

cha

nnel

of

thes

e ba

rrie

rs h

andl

e up

to

26.4

V an

d th

e m

axim

um v

olta

ge d

rop

is o

nly

6.38

V.

9091

DIG

ITA

L (O

N/O

FF)

INPU

TSSw

itch

esTh

e no

rmal

cho

ice

is t

he M

TL77

87+/

7787

P+ w

ith a

reg

ulat

ed

supp

ly. T

he M

TL77

4X m

odul

es a

re r

ecom

men

ded

for

appl

icat

ions

w

here

an

unre

gula

ted

supp

ly o

f up

to 3

0V fo

r re

lay

outp

ut m

odul

es,

or 3

5V fo

r so

lid s

tate

out

put m

odul

es, i

s us

ed.

The

MTL

7789

+ of

fers

a d

ual c

hann

el p

assi

ve b

arrie

r for

sw

itch

inpu

ts w

here

the

inpu

t cur

rent

for

each

cha

nnel

is <

10m

A.

DIG

ITA

L (O

N/O

FF)

OU

TPU

TSA

larm

s, L

EDs,

sole

noid

s va

lves

, et

cFo

r th

ese

appl

icat

ions

, th

e M

TL77

28+

is r

ecom

men

ded.

Hig

her-

pow

ered

ver

sion

s ar

e av

aila

ble:

the

MTL

7728

P+ i

s su

itabl

e fo

r IIC

ap

plic

atio

ns; t

he M

TL77

29P+

for

IIB a

pplic

atio

ns.

If th

e co

ntro

l sw

itch

is to

ear

th, t

hen

the

2-ch

anne

l MTL

7787

+ ba

rrie

r sh

ould

be

us

ed,

or,

alte

rnat

ivel

y,

the

MTL

7787

P+

high

er-p

ower

ve

rsio

n. If

the

supp

ly is

poo

rly r

egul

ated

use

the

MTL

7707

+.

The

MTL

7707

+ is

re

com

men

ded

for

appl

icat

ions

w

here

an

un

regu

late

d su

pply

of u

p to

35V

is u

sed.

Haza

rdous

Are

aSa

feA

rea

3 4

1 2M

TL7

78

7+

MTL

77

87

P+

Pow

er +

26.6

V

Sign

al

Pow

er B

us

3 4

1 2

MTL

7789+

7 85 6

Pow

er +

26.6

V

Pow

er +

26.6

VLo

gic

sign

al

Logi

c si

gnal

Pow

er B

us

3 4

1 2M

TL7743

MTL

7744

7 85 6

0��5�45��

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0��5�45��

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+�A

�

3 4

1 2M

TL7745

5 6

620Ω

10kΩ

+22.

9 - 3

0V LFD

CO

MC

H 1

Pow

er B

us

3 41 2

MTL

7742

5 60�

�5�45��

��0�

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+�A

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8���

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3 41 2

MTL

7741

5 67 8

/�

-�2

+�A

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/-

+26V

3 4

1 2

0V

0'!:

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MTL

77

07

+M

TL7

78

7+

MTL

77

87

P+

Switch

es /

Pro

xim

ity d

etec

tors

MTL

’s ra

nge

of n

ew s

witc

h/pr

ox in

put b

arrie

rs p

rovi

de th

e us

er w

ith

a ch

oice

of r

elay

and

sol

id s

tate

out

puts

in s

ingl

e an

d du

al c

hann

el

vers

ions

.

The

MTL

7741

is s

ingl

e ch

anne

l with

a c

hang

eove

r re

lay

outp

ut.

The

MTL

7743

and

MTL

7744

are

dua

l ch

anne

l ve

rsio

ns a

fford

ing

very

hi

gh

pack

ing

dens

ities

. Po

wer

m

ust

be

prov

ided

to

th

ese

mod

ules

usi

ng th

e po

wer

bus

faci

lity.

The

MTL

7745

is

a si

ngle

cha

nnel

pro

xim

ity i

nput

(or

sw

itch

inpu

t if

‘end

of l

ines

’ res

isto

rs a

re fi

tted)

with

rel

ay c

onta

cts

prov

idin

g sw

itch

and

line

faul

t sta

tus.

The

LFD

rel

ay c

onta

cts

clos

e w

hen

a fa

ult

is

dete

cted

.

The

MTL

7742

has

a s

ingl

e ch

anne

l so

lid s

tate

sw

itch

that

can

be

conf

igur

ed to

sw

itch

from

a p

ower

rail

or d

own

to g

roun

d. T

his

is a

lso

idea

l for

hig

h sw

itchi

ng fr

eque

ncy

appl

icat

ions

.

+24.

9V3 4

1 2M

TL7

70

7+

MTL

77

28

+M

TL7

72

8P+

MTL

77

29

P+

0V

0'!:

����

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

SPA

RE

CA

BLE

CO

RES

AN

D S

CREE

NS

The

MTL

7799

dum

my

barr

ier

is u

sed

prim

arily

for

sec

urin

g an

d ea

rthin

g un

used

cab

les

and

scre

en c

onne

ctio

ns.

Haz

ardo

us a

rea

term

inal

s 3

and

4 ar

e in

tern

ally

con

nect

ed to

the

DIN

-rail

mou

ntin

g/ea

rth

conn

ectio

n.

It al

so

prov

ides

a

pow

er

bus

conn

ectio

n fo

r di

rect

con

nect

ion

of p

ower

for

mod

ules

suc

h as

the

MTL

7743

and

M

TL77

44 w

here

no

pow

er s

uppl

y sc

rew

term

inal

is p

rovi

ded.

PO

SITI

VE

DC S

YST

EMS

Low

-lev

el t

o 1

2V

dc

syst

ems

The

two

chan

nels

of

the

MTL

7764

+ an

d M

TL77

67+

can

be

com

bine

d sa

fely

in II

C.

The

MTL

7764

+ ca

n be

use

d fo

r lo

w-le

vel l

ogic

ret

urn

sign

als

whi

lst

the

MTL

7767

+ is

use

d fo

r 6V

dc

and

12V

dc s

yste

ms.

18V

dc

syst

ems

The

sing

le-c

hann

el M

TL77

22+

is r

ecom

men

ded

for

18V

dc s

yste

ms.

AC A

ND

DC S

YST

EMS

Hig

h-l

evel

ac

and d

c sy

stem

sTh

e ve

rsat

ile st

ar-c

onne

cted

MTL

7765

ac a

nd M

TL77

78ac

allo

w V

wkg

to

be

deve

lope

d fro

m e

ach

chan

nel t

o gr

ound

but

onl

y al

low

Vw

kg to

be

dev

elop

ed b

etw

een

chan

nels.

Thi

s pr

ovid

es s

ome

com

mon

-mod

e vo

ltage

cap

abili

ty a

nd c

an a

llow

hig

her c

able

par

amet

ers

to b

e us

ed.

NEG

ATI

VE

AN

D F

LOA

TIN

G P

OW

ER S

UPPLI

ES

Dig

ital (o

n/o

ff)

outp

uts

The

MTL

7728

– is

use

d w

ith a

neg

ativ

e po

wer

sup

ply

and

posi

tive

earth

. Typ

ical

ly u

sed

for

digi

tal i

nput

s or

out

puts,

as

show

n.

The

MTL

7728

-- ca

n al

so b

e us

ed w

ith f

loat

ing

pow

er s

uppl

ies,

for

tra

nsm

itter

s.

Haza

rdous

Are

aSa

feA

rea

3 4

1 2

0V

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77

64

+M

TL7

76

7+

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0V/+

12V

+10V

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V

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1 20V

MTL

77

22

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434���

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9.6V

3 4

1 2M

TL7

76

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77

78

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VD

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9293

PO

WER

BU

S A

PPLI

CA

TIO

NS

The

PB77

00 p

ower

bus

is

inva

luab

le f

or s

avin

g in

stalla

tion

time

and

wiri

ng w

hen

conn

ectin

g a

24V

dc p

ower

sou

rce

to a

num

ber

of b

arrie

rs.

Typi

cal

appl

icat

ions

in

clud

e ha

zard

ous-a

rea

switc

hes,

4/

20m

A

trans

mitt

ers

and

prox

imity

de

tect

ors.

Th

e di

agra

m

illus

trate

s th

e co

nfig

urat

ion

for

4 ba

rrie

rs b

ut u

p to

40

barr

iers

can

be

serv

ed b

y th

is m

etho

d.

The

MTL

7798

pow

er f

eed

mod

ule

wou

ld n

orm

ally

be

used

with

sta

ndar

d ba

rrie

rs s

uch

as M

TL77

87+

and

MTL

7787

P+ b

ecau

se th

e cu

rren

t/vo

ltage

trip

pro

tect

ion

mec

hani

sm o

f th

e M

TL77

98 p

rote

cts

the

fuse

s in

the

barr

iers

.

The

MTL

7799

dum

my

barr

ier

can

be u

sed

inste

ad o

f th

e M

TL77

98

for

dire

ct ‘

feed

-thro

ugh’

con

nect

ion

of a

24V

dc

supp

ly o

nto

the

pow

er b

us. L

oopi

ng th

e po

wer

feed

to e

ach

end

of th

e bu

ssed

pow

er

allo

ws

the

rem

oval

of

indi

vidu

al b

arrie

rs w

ithou

t lo

ss o

f po

wer

to

othe

rs in

the

chai

n.

Oth

er u

nits

that

can

use

the

pow

er b

us fa

cilit

y:

M

TL77

06

MTL

7707

+

MTL

7707

P+

MTL

7741

M

TL77

42

MTL

7743

M

TL77

44

MTL

7745

M

TL77

87+

M

TL77

87P+

M

TL77

88+

M

TL77

88R+

M

TL77

89+

Haza

rdous

Are

aSa

feA

rea

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The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

MT

L77

00 S

ER

IES

AC

CE

SSO

RIE

S

MO

UN

TIN

G/E

ARTH

ING

ACCES

SORIE

SM

TL77

00 S

erie

s ba

rrie

rs m

ount

eas

ily a

nd q

uick

ly o

nto

stand

ard

DIN

ra

il w

hich

also

act

s as

the

intri

nsic

ally

saf

e ea

rth.

THR2 s

tandard

DIN

rail

THR7000 p

late

d r

ail

Spec

ially

nic

kel-p

late

d T-s

ectio

n (3

5mm

x 7

.5m

m) D

IN r

ail f

or u

se in

po

tent

ially

cor

rosi

ve a

tmos

pher

es. S

uppl

ied

in 1

met

er le

ngth

s.

ISP7000 insu

lating s

pace

rsA

ttach

ed t

o th

e ba

se o

f a

DIN

rai

l at

eith

er e

nd o

r at

int

erva

ls (d

epen

ding

upo

n D

IN r

ail

leng

th)

to i

sola

te t

he I

S ea

rth f

rom

a

struc

tura

l ear

th.

ERB5

7S

Eart

h-r

ail

bra

cket

, st

raig

ht

Nic

kel-p

late

d; s

uppl

ied

with

two

push

faste

ners

, one

14m

m e

arth

-rail

clam

p an

d on

e 10

mm

ear

th c

lam

p fo

r ca

bles

16

mm

2 .

ETM

7 e

art

h t

erm

inal

For

term

inat

ing

cabl

e sc

reen

s an

d 0V

ear

th r

etur

ns a

nd s

ecur

ing

spar

e co

res

to th

e ea

rth r

ail.

A m

axim

um o

f tw

o ET

M7s

per

bar

rier

can

be a

ccom

mod

ated

.

TG

L77

00

ER

B57

O

TAG

57

ER

L7

ET

M7 14

mm

ear

th-r

ail

clam

p TH

R2/

TH

R70

00 ER

B57

Sin

low

er p

osi

tio

n

ISP

7000

ET

L70

00

10m

m e

arth

clam

p

IMB

57

Sn

ap o

ff e

xten

sio

nw

hen

usi

ng

IMB

57as

a c

entr

al s

uppo

rt

27

7.5

35

14.6

62 50

20

M6

x 16

Ø4.

4M

4 x

16

IMB5

7 I

nsu

lating m

ounting b

lock

One

req

uire

d at

eac

h en

d of

a ta

ggin

g str

ip/e

arth

rai

l. Su

itabl

e fo

r lo

w-p

rofil

e (7

.5m

m) a

nd h

igh-

prof

ile (1

5mm

) sym

met

rical

DIN

rai

l.

ERB5

7O

Eart

h-r

ail

bra

cket

, off

set

Nic

kel-p

late

d; s

uppl

ied

with

two

push

faste

ners

, on

e 14

mm

ear

th-ra

il cl

amp

and

one

10m

m e

arth

cla

mp

for

cabl

es

16m

m2 .

ETL7

000 e

art

h t

erm

inal

Prov

ides

con

nect

ion

for

rout

ing

the

IS e

arth

fro

m t

he D

IN r

ail t

o an

ap

prop

riate

pla

nt e

arth

. Max

imum

cab

le c

ross

-sect

ion

is 1

0mm

2 . Tw

o re

com

men

ded

per

disc

rete

leng

th o

f DIN

rai

l. Se

e in

struc

tion

man

ual

INM

7700

for

mor

e de

tails

.

BPL7

700 P

ow

er B

us

link

Whe

n a

num

ber o

f bar

riers

use

a c

omm

on p

ower

sup

ply,

the

optio

nal

pow

er l

ink

(BPL

7700

) ca

n be

use

d. T

ypic

al a

pplic

atio

ns i

nclu

de

haza

rdou

s ar

ea

switc

hes,

so

leno

ids

and

4–20

mA

tra

nsm

itter

s.

The

barr

iers

it

can

be u

sed

with

are

the

MTL

7706

, M

TL77

07+,

M

TL77

87+,

MTL

7787

P+, M

TL77

89P+

and

MTL

774X

. See

nex

t pag

e fo

r fu

rther

det

ails.

82mm

135mm

28mm

66m

m15

mm

150m

m10

mm

3mm

9mm

14m

m

5mm

133.

5mm

10m

m

3mm

10m

m

57m

m

14m

m

10

43.5

48ov

erD

INra

il

9495

MTL

7700 b

arr

iers

Sele

ct b

y ba

rrie

r nu

mbe

r an

d po

larit

y,

e.g.

MTL

7728

+

Mounting a

cces

sori

esTH

R2

Stan

dard

DIN

-rail,

35

x 7.

5mm

THR7

000

T-sec

tion

DIN

-rail,

spe

cial

ly-p

late

d,

35 x

7.5

mm

, 1m

leng

thIS

P700

0 In

sula

ting

spac

er

Standard

eart

hin

g/e

art

h-r

ail

acc

esso

ries

ETL7

000

Earth

term

inal

, DIN

-rail

mou

nted

IMB5

7 In

sula

ting

mou

ntin

g bl

ock

ERB5

7S

Earth

-rail

brac

ket,

strai

ght

ERB5

7O

Earth

-rail

brac

ket,

offs

etER

L7

Earth

rai

l, 1m

leng

thET

M7

Earth

term

inal

, pac

k of

50

Standard

taggin

g a

cces

sori

esTA

G57

Ta

ggin

g str

ip, 1

m le

ngth

TGL7

700

Tagg

ing

strip

labe

ls, s

et o

f 10

x 0.

5m

Buss

ed p

ow

er lin

ks

BPL7

700

Pack

of 1

00

Encl

osu

res

DX0

70

Encl

osur

e, fo

r M

TL77

00 x

5D

X170

En

clos

ure,

for

MTL

7700

x 1

3D

X430

En

clos

ure,

for

MTL

7700

x 3

3

Spare

s (a

ll in

pack

s of

10)

SAF7

712

Safe

-are

a te

rmin

als

1 &

2H

AZ7

734

Haz

ardo

us a

rea

term

inal

s 3

& 4

SAF7

756

Safe

-are

a te

rmin

als

5 &

6H

AZ7

778

Haz

ardo

us a

rea

term

inal

s 7

& 8

TH77

00

Tag

hold

erLi

tera

ture

INM

7700

In

struc

tion

man

ual,

MTL

7700

Ser

ies

INA

7700

AT

EX in

form

atio

n,

MTL

7700

Ser

ies

INM

57EN

C

Instr

uctio

n m

anua

l, M

TL50

00/7

000

Serie

s En

clos

ures

CD

7700

...

Cus

tom

er d

raw

ings

TAG

GIN

G A

CCES

SORIE

STw

o m

etho

ds o

f tag

ging

are

ava

ilabl

e w

hich

can

be

used

sep

arat

ely

or to

geth

er:

1)

Indiv

idual barr

ier

iden

tifi

cation

TH7700 b

arr

ier

iden

tifi

ers

TH77

00 b

arrie

r id

entif

iers

are

sup

plie

d cl

ippe

d on

to

the

tops

of

indi

vidu

al b

arrie

rs t

o pr

ovid

e tra

nspa

rent

hol

ders

for

id

entif

icat

ion

labe

ls.

2)

Taggin

g s

trip

met

hod

TA

G5

7 T

aggin

g s

trip

, 1m

len

gth

Cut

to s

ize.

Sup

plie

d w

ith r

ever

sibl

e ta

ggin

g str

ip la

bel

suita

ble

for

eith

er M

TL50

00 o

r M

TL70

00 S

erie

s m

odul

e sp

acin

g.

TG

L7700 T

aggin

g s

trip

label

s, s

et o

f 10 x

0.5

m

For

use

with

TA

G57

tagg

ing

strip

. Tag

s ar

e re

vers

ible

- on

e si

de fo

r M

TL77

00, t

he o

ther

for

MTL

700.

�����

HO

W T

O O

RD

ER

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

Note

:

For

FM c

ompl

ianc

e, th

e M

TL77

00 S

erie

s ba

rrie

rs s

hall

be in

stalle

d in

com

plia

nce

with

the

encl

osur

e, m

ount

ing,

spa

cing

and

segr

egat

ion

requ

irem

ents

of th

e ul

timat

e ap

plic

atio

n.

‡

Cer

tifie

d to

CEN

ELEC

IIB/

FM G

rps

C-G

onl

y.

APPRO

VA

LS(f

or

the

late

st c

ertifi

cate

info

rma

tion s

ee w

ww

.mtl-i

nst.co

m/s

upp

ort

/cer

tifi

cate

s)

Reg

ion

(Auth

ori

ty)

UK

(BA

SEEF

A)

UK

(BA

SEEF

A)

Sys

tem

s

USA

(FM

)Canada/U

SA(C

SA)

Japan

(TIIS

)

Standard

EN 5

0014

EN 5

0020

EN 5

0039

3600

, 361

0 en

tity

3611

, 381

0C

AN

/CSA

E60

079

UL6

98, U

L913

, UL1

604

IEC

6007

9, C

22.2

See

Cer

tific

ates

Appro

ved f

or

[EEx

ia]

IIC[E

Ex ia

] IIB

‡EE

x ia

IIC

EEx

ia II

B ‡

AIS

/I,II

,III/

1/En

tity

ABC

DEF

G- S

CI-9

42;

NI/

I/2/

ABC

D/T

4[I/

0] A

Ex[ia

]IIC

–

SCI-9

42 E

ntity

; N

I/1/

2/IIC

/T4

Ta=6

0ºC

exc

ept †

whe

re T

a=65

ºC

Cla

ss 1

, Div

2, G

ps A

,B,

C,D

; Ex

nA [

iA]

IIC T

4C

lass

1, Z

one

2, A

Ex n

AIIC

T4

Ex (i

a) II

CEx

(ia)

IIB

‡

Model

No.

Cer

tifi

cate

No.

MTL

7706+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

MTL

7707+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

MTL

7707P+

BAS0

1ATE

X721

8‡Ex

01E2

220‡

3010

737‡

1345

550

MTL

7710+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

433

MTL

7715

+BA

S01A

TEX7

217

Ex01

E221

930

1073

713

4555

0C

1643

4M

TL7715

P+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

611

MTL

7722+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

435

MTL

7728+/–

/ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

397

MTL

7728P+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

436

MTL

7729P+

BAS0

1ATE

X721

8‡Ex

01E2

220‡

3010

737‡

1345

550

C16

612‡

MTL

7741

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

613

MTL

7742

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

614

MTL

7743

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

615

MTL

7744

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

616

MTL

7745

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

617

MTL

775

5ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737†

1345

550

C16

450

MTL

775

6ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737†

1345

550

C16

437

MTL

775

8+/–

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

618

MTL

7760ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

619

MTL

7761ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

438

MTL

7761Pac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

MTL

7764+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

440

MTL

7764ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

441

MTL

7765

ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

620

MTL

7766ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

442

MTL

7766Pac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

443

MTL

7767+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

444

MTL

7778ac

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

621

MTL

7779+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

445

MTL

7787+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

447

MTL

7787P+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

448

MTL

7788+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

449

MTL

7788R+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

449

MTL

7789+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

622

MTL

7796+

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

446

MTL

7796–

BAS0

1ATE

X721

7Ex

01E2

219

3010

737

1345

550

C16

446

MTL

7798

NI o

nly

9697

Note

s: 1

'a

c' in

dica

tes

a no

n-po

laris

ed, s

tar-c

onne

cted

bar

rier

conf

igur

atio

n.

2 W

hen

the

exte

rnal

circ

uit c

onta

ins n

o lu

mpe

d in

duct

ance

gre

ater

than

10

H, t

he c

able

indu

ctan

ce m

ay b

e in

crea

sed

to th

e va

lues

with

in p

aren

thes

es.

3

See

next

pag

e.

For

furth

er b

arrie

r ch

anne

l con

figur

atio

n da

ta, p

leas

e re

fer

to th

e re

leva

nt c

ertif

icat

e.

MA

XIM

UM

CA

BLE

PA

RA

MET

ERS

(for

the

late

st in

form

ation s

ee w

ww

.mtl-i

nst.co

m/s

upp

ort

/cer

tifi

cate

s)

Model

No.

ac1

/dc

Note

3

ref.

BA

SEEF

A G

roup I

ICM

atc

hed

Pow

er

(W)

FM (

Grp

s A

&B)

Matc

hed

Pow

er

(W)

C

(F)

L 2

(mH

)L/

R

(μH

/)

C (F)

L 2

(mH

)L/

R(μ

H/

)M

TL7

70

6+

a0.

083

3.05

(4.2

)56

0.65

0.08

34.

256

0.65

MTL

77

07

+a1

/a2/

b0.

083

3.05

(4.2

)56

0.65

0.08

34.

256

0.65

MTL

77

10

+a

30.

9174

0.50

30.

9174

0.50

MTL

77

15

+a

0.58

1.45

660.

560.

581.

4566

0.56

MTL

77

15

P+

a0.

580

0.33

281.

090.

580

0.33

281.

09M

TL7

72

2+

a0.

165

1.45

450.

810.

165

1.45

450.

81M

TL7

72

8+/

-/ac

a0.

083

3.05

(4.2

)56

0.65

0.08

33.

05 (4

.2)

560.

65M

TL7

72

8P

+a

0.08

31.

82 (2

.51)

440.

830.

083

1.82

(2.5

1)44

0.83

MTL

77

4X

b32.

8696

742

—2.

8696

742

0.03

9M

TL7

75

5ac

a1/a

210

00.

4614

50.

225

100

0.46

145

0.22

5b

100

0.13

690.

4540

0.13

690.

45c

400.

4173

0.45

400.

1369

0.45

MTL

77

56

aca1

/a2/

a310

00.

4614

50.

225

100

0.46

145

0.22

5b1

100

0.13

690.

4540

0.13

690.

45b2

100

0.06

440.

675

400.

1369

0.45

c140

0.41

730.

4540

0.13

690.

45c2

400.

2361

0.60

400.

0644

0.67

5M

TL7

75

8+/

-a1

/a2

11.1

0.07

261.

4011

.10.

0726

1.4

b11

.10.

0210

2.8

8.8

0.02

102.

8M

TL7

76

0ac

a1/a

23

0.91

740.

53

0.91

740.

5b

30.

2027

1.00

30.

2035

.61.

00M

TL7

76

1ac

a1/a

24.

93.

7216

30.

225

4.9

3.72

163

0.22

5b

4.9

0.91

620.

450.

310.

9162

0.45

c0.

313.

7281

0.45

0.31

0.91

620.

45M

TL7

76

1P

aca1

/a2

4.9

5661

30.

058

4.9

5661

30.

058

b4.

914

236

0.11

50.

3114

.023

60.

115

c0.

3156

306

0.11

50.

3114

.023

60.

115

MTL

77

64

+a1

/a2

1.41

240

1000

0.03

61.

4124

010

000.

036

b1.

4161

360

0.07

21.

061

360

0.07

2M

TL7

76

4ac

a1/a

21.

4124

010

000.

036

1.41

240

1000

0.03

6b

1.41

6136

00.

072

0.12

561

360

0.07

2c

0.12

524

050

00.

072

0.12

561

360

0.07

2M

TL7

76

5ac

a1/a

20.

580

1.45

660.

560.

580

1.45

660.

56b

0.58

00.

3222

1.12

50.

580.

3231

.61.

12M

TL7

76

6ac

a1/a

21.

415.

815

10.

241.

415.

815

10.

24b

1.41

1.47

580.

480.

125

1.47

580.

48c

0.12

55.

875

0.48

0.12

51.

4758

0.48

MTL

77

66

Pac

a11.

411.

4778

0.47

11.

411.

4778

0.47

1b

1.41

0.34

290.

942

0.12

50.

3429

0.94

2c

0.12

51.

1539

0.94

20.

125

0.34

290.

942

MTL

77

67

+a1

/a2

0.58

1.45

660.

560.

581.

4566

0.56

b0.

580.

3222

1.12

50.

580.

3222

1.12

5M

TL7

77

8ac

a1/a

20.

083

1610

70.

330.

083

1610

70.

33b

0.08

33.

05 (4

.2)

420.

330.

083

4.0

107

0.65

4M

TL7

77

9+

a1/a

20.

083

3.05

(4.2

)56

0.65

0.08

33.

05 (4

.2)

560.

65b

NO

T PER

MIT

TED

MTL

77

87

+/-

a10.

083

3.05

(4.2

)56

0.65

0.08

33.

05 (4

.2)

560.

65a2

0.08

3—

——

0.08

3—

——

b0.

083

3.05

(4.2

)56

0.65

0.01

14.

256

0.65

MTL

77

87

P+

a10.

083

1.82

(2.5

1)44

0.83

50.

083

1.82

(2.5

1)44

0.83

a20.

083

——

—0.

083

——

—b

0.08

31.

82 (2

.51)

440.

835

0.78

2.51

440.

835

MTL

77

88

+a1

0.08

33.

05 (4

.2)

560.

650.

083

3.05

(4.2

)56

0.65

a23.

00.

9174

0.5

3.0

0.91

740.

5b

0.08

30.

3325

0.92

0.08

30.

3325

0.92

MTL

77

88

R+

a10.

083

3.05

(4.2

)56

0.65

0.08

33.

05 (4

.2)

560.

65a2

3.0

0.91

740.

53.

00.

9174

0.5

b0.

083

0.33

250.

920.

083

0.33

250.

92M

TL7

78

9+

C0.

083

1610

60.

330.

083

1610

60.

33M

TL7

79

6+/

-a1

0.1

4.91

640.

560.

14.

9164

0.56

a20.

2213

136

0.26

0.22

1313

60.

26b

0.1

1.94

340.

810.

096

1.94

340.

81

Model

No.

ac1

/dc

Note

3

ref.

BA

SEEF

A G

roup I

IBM

atc

hed

Pow

er

(W)

FM (

Grp

s C-G

)M

atc

hed

Pow

er

(W)

C

(F)

L 2

(mH

)L/

R

(μH

/)

C (F)

L 2

(mH

)L/

R(μ

H/

)

MTL

77

07

P+

a10.

655.

3412

51.

200.

655.

3412

51.

20b

0.65

5.34

125

1.20

0.58

75.

3412

51.

20M

TL7

72

9P

+a1

0.65

5.65

127

1.19

0.65

5.65

127

1.19

The

giv

en d

ata

is o

nly

inte

nded

as

a pro

duct

des

crip

tion

and

shou

ld n

ot b

e re

gar

ded

as

a le

gal

war

ranty

of pro

per

ties

or

guar

ante

e. In

the

inte

rest

of

furt

her

tec

hnic

al d

evel

opm

ents

, w

e re

serv

e th

e ri

ght

to m

ake

des

ign

chan

ges

.

CO

RR

ELA

TIO

N B

ETW

EEN

MTL

770

0 —

MTL

700

0 —

MTL

700 B

AR

RIE

RS

(IIC

)

Note

3 :

The

circ

uit c

onfig

urat

ion

for

the

outp

ut p

aram

eter

s gi

ven

in th

e ta

ble

‘Max

imum

Cab

le P

aram

eter

s’ a

re a

s fo

llow

s:-

a Si

ngle

cha

nnel

bar

rier.

a1

Firs

t cha

nnel

of a

dua

l/tri

ple

chan

nel b

arrie

r.a2

Se

cond

cha

nnel

of a

dua

l/tri

ple

chan

nel b

arrie

r.a3

Th

ird c

hann

el o

f a d

ual/

tripl

e ch

anne

l bar

rier.

b Bo

th

chan

nels

of

a du

al

chan

nel

barr

ier

conn

ecte

d in

pa

ralle

l, w

ith r

espe

ct to

ear

th.

b1

Two

chan

nels

of

a tri

ple

chan

nel

barr

ier

conn

ecte

d in

pa

ralle

l, w

ith r

espe

ct to

ear

th.

b2

Thre

e ch

anne

ls of

a t

riple

cha

nnel

bar

rier

conn

ecte

d in

pa

ralle

l, w

ith r

espe

ct to

ear

th.

b3

Both

cha

nnel

s of

eac

h sw

itch

inpu

t con

nect

ed to

geth

erc

Both

cha

nnel

s of

a d

ual c

hann

el b

arrie

r in

terc

onne

cted

, with

no

ear

th r

etur

n.c1

Tw

o ch

anne

ls of

a tr

iple

cha

nnel

bar

rier

inte

rcon

nect

ed, w

ith

no e

arth

ret

urn.

c2

Thre

e ch

anne

ls of

a t

riple

cha

nnel

bar

rier

inte

rcon

nect

ed,

with

no

earth

ret

urn.

Thi

s as

sum

es tw

o of

the

chan

nels

are

in

para

llel.

Module

No.

Buss

ed

Pow

er

MTL

70

00

Eq

uiv

ale

nt

MTL

70

00

O

rigin

al

Cer

tifi

cate

N

um

ber

(s)

MTL

70

00

A

TEX

Cer

tifi

cate

N

um

ber

(s)

MTL

70

0

equiv

ale

nt

MTL

70

0

Ori

gin

al

Cer

tifi

cate

N

um

ber

(s)

MTL

70

0

ATE

X

Cer

tifi

cate

N

um

ber

(s)

Typic

al

Applic

ation

MTL

77

10

+N

oH

alf o

f M

TL71

62+

Ex95

C22

61BA

S99A

TEX7

285

MTL

710+

Ex83

2452

BAS0

1ATE

X720

24/

6V S

yste

ms

MTL

77

15

+N

oN

/AN

/AN

/AM

TL71

5+Ex

8324

52BA

S01A

TEX7

202

12V

Syste

ms

MTL

77

15

P+

No

N/A

N/A

N/A

MTL

715P

+Ex

92C

2373

BAS0

1ATE

X720

212

V Sy

stem

s

MTL

77

22

+N

oM

TL71

22+

Ex95

C22

61BA

S99A

TEX7

285

MTL

722+

Ex83

2452

BAS0

1ATE

X720

2G

ener

al P

urpo

se

MTL

77

28

+/-

No

MTL

7028

+/-

MTL

7128

+/-

Ex95

C22

61BA

S99A

TEX7

285

MTL

728+

/-Ex

8324

52BA

S01A

TEX7

202

Ana

logu

e /

Dig

ital

MTL

77

28

ac

No

N/A

N/A

N/A

MTL

728a

cEx

8324

52BA

S01A

TEX7

202

Gen

eral

Pur

pose

MTL

77

28

P+

No

MTL

7128

P+Ex

95C

2261

BAS9

9ATE

X728

5M

TL72

8P+

Ex92

C23

73BA

S01A

TEX7

202

Ana

logu

e /

Dig

ital

MTL

77

55

ac

No

MTL

7055

acEx

95C

2261

BAS9

9ATE

X728

5M

TL75

5ac

Ex83

2452

BAS0

1ATE

X720

2RT

D, G

roun

ded

MTL

77

56

ac

No

MTL

7056

acEx

95C

2261

BAS9

9ATE

X728

5N

/AN

/AN

/ART

D, G

roun

ded

MTL

77

58

+/-

No

N/A

N/A

N/A

MTL

758

Ex83

453

BAS0

1ATE

X721

7A

ctiv

e se

nsor

s,

MTL

77

60

ac

No

N/A

N/A

N/A

MTL

760a

cEx

8324

52BA

S01A

TEX7

202

Act

ive

sens

ors,

Th

erm

ocou

ples

MTL

77

61

ac

No

MTL

7261

acEx

95C

2261

BAS9

9ATE

X728

5M

TL76

1ac

Ex83

2452

BAS0

1ATE

X720

2St

rain

Gau

ges

MTL

77

61

Pac

No

MTL

7061

Pac

MTL

7161

Pac

Ex95

C22

61BA

S99A

TEX7

285

MTL

761P

acEx

92C

2373

BAS0

1ATE

X720

2Lo

ad c

ell

MTL

77

64

+N

oM

TL71

64+

Ex95

C22

61BA

S99A

TEX7

285

MTL

764+

Ex83

2452

BAS0

1ATE

X720

2H

igh

resi

stanc

e

MTL

77

64

ac

No

MTL

7264

acEx

95C

2261

BAS9

9ATE

X728

5M

TL76

4ac

Ex83

2452

BAS0

1ATE

X720

2St

rain

/ L

evel

G

auge

sM

TL7

76

5ac

No

N/A

N/A

N/A

MTL

765a

cEx

8324

52BA

S01A

TEX7

202

Gen

eral

Pur

pose

MTL

77

66

ac

No

N/A

N/A

N/A

MTL

766a

cEx

8324

52BA

S01A

TEX7

202

Stra

in G

auge

s

MTL

77

66

Pac

No

MTL

7066

Pac

MTL

7166

Pac

Ex95

C22

61BA

S99A

TEX7

285

MTL

766P

acEx

92C

2373

BAS0

1ATE

X720

2St

rain

Gau

ges

MTL

77

67

+N

oM

TL71

67+

Ex95

C22

61BA

S99A

TEX7

285

MTL

767+

Ex83

2452

BAS0

1ATE

X720

2D

ual M

TL71

5

MTL

77

79

+N

oN

/AN

/AN

/AM

TL77

9+Ex

8324

52BA

S01A

TEX7

202

Dua

l MTL

728

MTL

77

87

+/-

Yes

MTL

7087

+ M

TL71

87+

Ex95

C22

61BA

S99A

TEX7

285

MTL

787S

+Ex

8324

52BA

S01A

TEX7

202

Ana

logu

e /

Dig

ital

MTL

77

87

P+

Yes

MTL

7087

P+

MTL

7187

P+Ex

95C

2261

BAS9

9ATE

X728

5M

TL78

7SP+

Ex92

C23

73BA

S01A

TEX7

202

Ana

logu

e /

Dig

ital

MTL

77

88

+Ye

sN

/AN

/AN

/AM

TL78

8+Ex

8324

52BA

S01A

TEX7

202

Tran

smitt

ers

MTL

77

88

R+

Yes

N/A

N/A

N/A

MTL

788R

+Ex

8324

52BA

S01A

TEX7

202

1—5V

sys

tem

s

MTL

77

96

+/-

No

MTL

7096

- M

TL71

96-

Ex95

C22

61BA

S99A

TEX7

285

MTL

796+

/-Ex

8324

52BA

S01A

TEX7

202

Vibr

atio

n se

nsor

s

9899

Coop

er C

rous

e-Hi

nds

inte

grat

es a

com

preh

ensi

ve l

ine

of e

lect

rical

and

in

stru

men

tatio

n pr

oduc

ts w

ith e

xper

t sup

port,

indu

stry

insi

ghts

and

loca

l av

aila

bilit

y to

im

prov

e sa

fety

and

pro

duct

ivity

in

the

mos

t de

man

ding

in

dust

rial a

nd c

omm

erci

al e

nviro

nmen

ts w

orld

wid

e.

Cust

omer

s w

ill n

ow b

e ab

le to

ben

efit

from

a s

ingl

e su

pplie

r fo

r al

l of t

heir

haza

rdou

s ar

ea n

eeds

, whe

ther

this

is fo

r ins

trum

enta

tion

prod

ucts

, fie

ldbu

s

com

pone

nts,

ele

ctric

al s

witc

hgea

r or e

nclo

sure

and

wiri

ng s

olut

ions

.

MTL

Inst

rum

ents

is r

ecog

nise

d as

a w

orld

lead

er in

the

deve

lopm

ent a

nd

supp

ly o

f Int

rinsi

c Sa

fety

, Pro

cess

Con

trol a

nd S

urge

Pro

tect

ion

prod

ucts

.

Man

y of

the

wor

ld's

saf

ety-

criti

cal p

roce

sses

are

mon

itore

d, c

ontro

lled

or

prot

ecte

d by

MTL

Inst

rum

ents

pro

duct

s an

d th

e co

mpa

ny is

dis

tingu

ishe

d

by it

s gl

obal

net

wor

k of

sal

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GLOBAL LOCATIONS

www.mtl-inst.com enquiry@mtl-inst.com

AUSTRALIA

MTL Instruments Pty Ltd, 9 /12 Billabong Street,Stafford, Queensland 4053Australia

Tel: + 61 1300 308 374 Fax: + 61 1300 308 463E-mail: enquiries@mtlaus.com.au

CHINA

Cooper Electric (Shanghai) Co. Ltd. Room 2001, China Life Tower,16 Chao Yang Men Wai Street,Chao Yang District, Beijing, China 100020

Tel: + 86 10 5980 0288 Fax: + 86 10 8562 5725E-mail: bjsales@mtl-inst.cn

FRANCE

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Tel: + 33 (0)4 78 64 98 32 Fax: + 33 (0)4 78 35 79 41E-mail: info@mtl-inst.fr

GERMANY

MTL Instruments GmbH, An der Gümpgesbrücke 17D-41564 Kaarst, Germany

Tel: + 49 (0)2131 718930 Fax: + 49 (0)2131 7189333E-mail: info@mtl.de

INDIA

MTL India, No.36, Nehru StreetOff Old Mahabalipuram RoadSholinganallur, Chennai - 600 119, India

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ITALY

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Tel: + 39 (0)2 61802011 Fax: + 39 (0)2 61294560E-mail: info@mtl-inst.it

JAPAN

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Tel: + 81 (0)3 6430 3128 Fax: + 81 (0)3 6430 3129E-mail: sales@mtlkk.co.jp

KOREA

Cooper Crouse-Hinds Korea12F, Vision Tower707-2 Yeoksam-Dong Gangnam-Gu,Seoul 135-080, South Korea.

Tel: + 82 2 3484 6795 Fax: + 82 2 3484 6778jake.lee@cooperindustries.com

NETHERLANDS

MTL Instruments BVTerheijdenseweg 465, 4825 BK BredaThe Netherlands

Tel: +31 (0) 76 7505360 Fax: +31 (0) 76 7505370E-mail: info@mtlbenelux.com

SINGAPORE

Cooper Crouse-Hinds Pte LtdNo 2 Serangoon North Avenue 5, #06-01 Fu Yu BuildingSingapore 554911

Tel: + 65 6 487 7887 Fax: + 65 6 487 7997E-mail: sales@mtlsing.com.sg

UNITED ARAB EMIRATES

MTL Instruments, Villa No. 4, Sector 2-17Street 6, PO Box 53234Abu Dhabi, UAE

Tel: + 971 2 446 6840 Fax: + 971 2 446 6841E-mail: mtlgulf@mtl-inst.com

UNITED KINGDOM

Measurement Technology Limited, Great Marlings, Butterfield, LutonBeds LU2 8DL

Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283E-mail: enquiry@mtl-inst.com

AMERICAS

Cooper Crouse-Hinds MTL Inc. 3413 N. Sam Houston Parkway W.Suite 210, Houston TX 77086, USA

Tel: + 1 281-571-8065 Fax: + 1 281-571-8069E-mail: csinfo@mtl-inst.com