4

Series No.

Price

Page No.

Configuration

AvailableCalibration

TemperatureRange(Configuration andapplication dependent)

Insulation/Sheathing

Size(Non-standardlengths readilyavailable)

Features

Applications

Sold As

Thermocouple

Unsheathed TC

£11.50 pkg of 5

14

Fine gauge bare wire uninsulated exposed junction

J, K, T, E, R, S, B, G, C, D, N

To 2315°C

None

0.0127 to 0.813 mm dia

150 or 300 mm lengths standard

Fast response. Very small diameters.

Pin-pointmeasurements.

Low heat transfer.

Biophysics, scientific instruments,

cryogenics, gas chromatography, quickly changing

temperatures. Unprotected, not suitable for liquid immersion and

applications requiringprotected probes.

J, K, T, E, N sold in packs of 5. R, S, B, G, C, D calibrations sold individually. Contact Sales for special sizes and

assemblies.

5TC/5SRTC

£22 pkg of 5

16

Insulated exposed junction

J, K, T, E

To 480°C

PFA or glass braid KAPTON®

0.0127 to 0.813 mm dia

1 or 2 m lengths standard

Moulded subminiature connector with

integral strain relief(5SRTC only). class 1 wire. Fast response.

Gas and surface measurements,

applications requiring exposed

thermocouple bead. PFA insulation

resists chemical attack, glass

insulation rated for high temperatures.

Packs of 5. Contact Sales for special sizes and

assemblies.

5SC / 5LSC

£39 pkg of 5

18

Insulated exposed junction with wire

caddy mini connector

J, K, T, E

To 480°C connector to

220°C

PFA or glass braid KAPTON®

0.0127 to 0.813 mm dia

1 or 2 m lengths standard

Moulded subminiature connector with

integral strain relief. class 1 wire.

Fast response.

Gas and surface measurements,

applications requiringexposed

thermocouple and strain relief connector

attachments. PFA insulation resists chemical attack, glass insulation rated for high temperatures.

Packs of 5. Contact Sales for special sizes and

assemblies.

HSTC

£16.75

19

Hermetically sealed tip

J, K, T, E

To 250°C

PFA

7/0.2 mm stranded, 1 or 2 m

lengths standard

Hermetically sealed thermcouple

junction. Flexible, small and fast

response.

Cleanrooms, laboratories, food services, chemical

and petroleum. PFA insulation resists chemical attack.

Individually.

SA2

£20

20

Self-adhesive silicone patch

J, K, T, E

To 200°C

Sensor patch: silicone.

Leadwire: PFA

Flat, 15 x 50 mm or

35 x 12 mm. 7/0.2 mm stranded thermcouple wire.

1 and2 m lengths

Custom lengthsavailable

Self adhesivesilicone patch

Surface temperature. Flat or curved metal, glass, plastic or other

smooth surface

Individually.

SA1 / SA1-SC

£40 pkg of 5

21

Insulated with self-adhesive pad

J, K, T, E

-60 to 175°C

PFA

Flat, 25 x 19 mm 1 m length

Custom lengths available

Self-adhesive backing. Fast

response. Low thermal inertia.

Surface temperature

measurement easily removed

Packs of 5. Other lengths

available.

Selection Guide

Series No.

Price

Page No.

Configuration

AvailableCalibration

TemperatureRange(Configuration andapplication dependent)

Insulation/Sheathing

Size(Non-standardlengths readilyavailable)

Features

Applications

Sold As

SA1XL

£54 pkg of 5

22

Insulated withself adhesivepad. Can alsobe used as a

“Cement-On” Pad

J, K, T, E

To 315°C

Sensor tip: Kapton® ,fibre glass Leadwire:fibreglass (also available

with SS overbraid)

Flat, 9.5 x 25.4 mm1 or 2 mlengths

Custom lengthsavailable.

“All-in-One”surface TC.

Self adhesive or“Cement-On”.Fast response.

Low thermal inertia.

Flat or curvedmetal, glass,

plastic or othersmooth surfaces.

Packs of 5Other lengths

available.

Bare, SH,DH, FS

£4

omega.co.uk

Bare wire TCwith ceramic

beadinsulation

J, K, T, E, N

Various;depends ondiameter of

thermocouple

Ceramic beadinsulators

0.5 to3.25 mm dia

300 mmlengths with

75 mmleads standard

Choice ofvarious ceramic

insulatorsavailable withmost sizes.

Fast response.

Insidethermowells.Some models

for hightemperatures.

glued to surface.

Individually.Contact Sales

forspecial sizes.

5

XS-20 - K

£10.75

omega.co.uk

Silica insulatedexposed junction

J, K, E, N

Insulation to1038°F

Thermocouple torated limits

High temperaturesilica ceramic

0.5, 0.8,1.6 mm dia

300 mmlengths with

150 mmincrementaladd’l lengths

Insulation ratedto 1200°C

continuous,1425°C

short term.

High temperature.Can be used

as the elementin a head and

well assembly.

Individually.

WT

£15.50

25

Insulated withwasher termination

armoured cableoption

J, K, T, E

To 480°C

Glass braid and PFA

600 mm to 2 mlengths. 3.7 to6.6 mm washer

hole dia forM3.5, M4, M4.5, M6

screws

Washer terminationattaches to surfaces

with various sizescrews. Armoured

cable option.

Surface temperaturemeasurement.

Bolts to surface.

Individually.Stripped leads or

OSTW type standardsize connector.

Custom lead lengthsavailable.

XSIB

£18

omega.co.uk

Silica fibreinsulated,

Inconel overbraid

J, K, E, N

To 1038°Cdepending on alloys

High temperaturesilica fibre with

Inconel 600overbraid

4.5 to8 mm dia1 to 3 mlengths

5 styles available:flexible, abrasion-

resistant, high-temperature rating.

Ovens, furnacesprofiling machinery.

Custom lengths.

TRP

£43.50

omega.co.uk

Temperaturereference probe

J, K, T, E, R, S, B,G, C, D

Probe to 980°C

304 Stainless steelsheath material

3.2 mm dia150 mm probe

300 mmstandard lead

length

Made with Class 1wire. Comes with

mating connectors.

Calibrationaccessory.

Thermocouple tocopper transition atprobe tip typicallyused in ice point

chamber

Individually

TCMAG

£40.50

52

Magnetic mount

J, K, T, E

To 370°C

PVC, PFA,silicon orfibreglass

25 H x 40 Wx 25 mm D

Magnetic, spring-mounted TC. Single ordual 9 kg pull magnet.

Connector andcable clamp options

Surfacetemperatures of

magnetic material

Individually.Single or dualmagnet probe.Custom lead

lengths available.

THERMOCOUPLES

MAGNET

6

Thermocouple

All Probe Pages Displaying the XL Logo areavailable in Super OMEGACLADTM XL Material

Series No.

Price

Page No.

Configuration

AvailableCalibration

TemperatureRange(Configuration andapplication dependent)

Insulation/Sheathing

Size(Non-standardlengths readilyavailable)

Features

Applications

Sold As

SuperOMEGACLADTM XL

£17.50

26

Super OMEGACLADTM XLtransition joint,

quick connect andhandle styles

K, N

To 1335°C

MgO insulation withNickel-chrome based

Super OMEGACLADTM XLSheathing

0.25 to 9.5 mm dia300 mm standardlength or 150 mm

High temperature,low thermal drift,

very stable.

Excellent oxidation,carburisation and

chlorination resistance.

Individually.Custom lengths

available

Mini Conn Probes

£16

30

Metal sheathed,quick disconnect

probes with miniaturesized connectors

J, K, T, E, N

To 980°C

MgO insulation with304 or 321 SS or

Inconel 600 sheathing310SS/316SS

0.25 to 9.5 mm dia50, 300, 450

and 600 mm lengths.Other lengthson request.

Mini male connectors(mating females

included)

Page Model Feature:A-49, GKMQSS, low-noise

A-51, HGKMQSS,high-temp, low noise

A-59, KMQSS, standardA-61, HKMQSS,

high-tempA-69, SHX, ceramic

Extreme, High-Temp

£83

32

Metal sheathed exotichigh-temperature

probes

R, S, B, G, C, D

To 2300°C invacuum. To 2200°C

in inert/reducing atmosphere.To 1540°C in

oxidising atmosphere.

Hafnia, magnesia or aluminainsulation with tantalum,molybdenum, Pl rhodiumalloy or Inconel 600 sheathing

1.5 to 6.0 mm dia.Various lengths

Very high temperatureratings. Choice of quickdisconnect, transition

junction, high temperatureconnector or stripped

lead termination.

High temperaturemeasurements in inert,oxidising, or reducing

atmospheres.

Individual probes.Lead wire, standard or

mini connectors,heavy-duty or ceramic.

Contact Sales forspecial requirements.

(Probe ) Dual

£37.50

omega.co.uk

Dual element withminiature or standard

size connector

J, K, T, E, N

To 980°C

MgO insulation with304 or Inconel

sheathing310SS/316SS

1.5 to 6.0 mm dia

Standard andsubminiatureconnectors.

Permits 2 tempsignals from 1 point.General purpose andimmersion. Probesbend to radius of no

less than 3xsheath diameter.

Individually

Bendable sheaths/many optional features eg. grounded,ungrounded, exposed tip, SS or Inconel sheath, moulded ornon-moulded and connectors, weld pads, PFA coating, lownoise designs, high temperature, EMI suppression, low-

cadmium environmentally friendly polymer

STD ConnectorProbes

£18

31

Metal sheathed, quickdisconnect probeswith standard size

connectors

J, K, T, E, N

To 980°C

MgO insulation with304 or 321 SS or

InconelTM 600 sheathing310SS/316SS

0.25 to 9.5 mm dia50, 300, 450

and 600 mm lengths.Other lengthson request.

Standard maleconnectors (matingfemales included)

Page Model Feature:A-54, GKQIN, low noise

A-57, HGKQIN,high-temp, low noiseA-63, KQSS, mouldedA-65, HKQIN, high-tempA-67, CAIN, standardA-69, NHX, ceramic

Immersion in liquid,gas or air, custom tips

for soft solidpenetration, fast

response, surface andair measurement.

Page Model FeatureMini Plug, page 30

Standard Plug, page 31Ceramic Plug, page 34

(Probe) -NHX, -SHX

£24.50

34

Metal sheathed,quick disconnect, high

temperature probes

J, K, T, E, N

Depending onthermocouple type

and diameter

MgO insulation with304 or 321 SS or

Inconel 600 sheathing

0.25 to 6.0 mm dia150, 300, 450and 600 mm

lengths standard

Includes SHX or NHXceramic male connectors

rated to 650°C.Mating female connectorincluded. Standard and

miniature sizes.

High temperaturerequiring quickconnection and

disconnection of probe,and where sheath and

connectors may besubjected to high

temperatures.

Individually.Custom lengths

available. Supplied withmating femaleconnector andcable clamp.Contact Sales

for specialrequirements.

Available as

See page 26 to 29.

7

Selection Guide

Series No.

Price

Page No.

Configuration

AvailableCalibration

TemperatureRange(Configuration andapplication dependent)

Insulation/Sheathing

Size(Non-standardlengths readilyavailable)

Features

Applications

Sold As

(Probe) -PFA

£31.50

35

Metal sheathed PFAcoated probes(probes can beordered bent)

Various

To 200°C

Magnesium oxideinsulation with SS or

InconelTM 600 sheathingand PFA coating

As small as1 mm OD

1.2 mmax length

Chemically inert.Electrically insulated.Abrasion resistant.

Battery electrolyte,plating baths,

anodising baths,severe environments,caustic or corrosivechemical solutions.

Individual metalsheathed probes.PFA coating also

available onthermowells.

Contact Sales forspecial requirements.

TB-(*)

£18

omega.co.uk

Metal sheathedprobes with colour

coded terminalblock

J, K, T, E, N

Probe to 980°Cblock to 220°C

Magnesium oxideinsulation with SS orInconel 600 sheathing

310SS/316SS

1.5 to6.0 mm dia

300, 600, 900 mmlengths standard

Integral terminalblock providesquick wiring.

Inside thermowellsand/or quickhook-ups for

direct immersioncompression

fitting mounting

Individually.Contact Sales for

specialrequirements.

Transition Joint

£18.75

36 to 43

Metal sheathed,metal transitionjunction probes

J, K, T, E, N

To 980°C

MgO insulation with304 or 321 SS or

Inconel 600sheathing

310SS/316SS

0.25 to 9.5 mm dia50, 300, 450and 600 mm

lengths. Otherlengths on request

Flexible stripped wireor optional terminals(See STD and Miniconnector probes).

USB output(page 37)

Imersion in liquid,gas or air, customtips for soft solidpenetration, fast

response, surfaceand air

measurement.

TJ1 Standard, page 36Metal Braided Lead,

page 40Armoured Lead,

page 37High Temperature,

page 37USB output,

page 41

TJFT72

£21.50

omega.co.uk

Special probesetransition junction

probes

J, K, T, E

Probe to 980°C

MgO insulation with304 or 321 SS or

Inconel 600sheathing

310SS/316SS

1.5 and 6.0 mm dia150, 300, 450and 600 mm

lengths standard

Ungrounded,grounded or

exposed junction.

General purposeand immersion.radius of no less

than 3x the diameterof the sheath.

Individually.Contact Sales for

special sizes

TC-PVC-(*)

£10.75

omega.co.uk

Insulated, soft vinyl

J, K, T, E

-10 to 80°C

PVC withepoxy-coated tip

3.2 mm tip dia.3 m length

Sealed junction tip,includes male

write-on connector

Submersion, soil,Probes bend to wet

or moistenvironments.

Individually or inpacks of 5.

(*)-G1/4

£26.50

48

Pipe plug probe

J, K, T

To 480°C

Mixed

M8 x 1M10 x 1

G1/8G1/4G1/2

SS fitting2 m leadstandard

Easy pipeor tank

installation

Individually.

PP3-36-(*)

£190

44

Profile probes

J, K, T, E

Probe to 650°C

MgO insulationwith 316SSsheathing

3, 4.5 or6 mm dia

length 900 mmleads; customsizes available

3, 6, 10 sensingpoints on oneprobe custom

number available

Furnaces, reactors,heat exchanges,

air ducts.

Individually.Custom sizes

available.

THERMOCOUPLES

8

Series No.

Price

Page No.

Configuration

AvailableCalibration

TemperatureRange(Configuration andapplication dependent)

Insulation/Sheathing

Size(Non-standardlengths readilyavailable)

Features

Applications

Sold As

HYP

£33.50

46

Metal sheathedhypodermic probes

J, K, T, E, RTD

To 200°C

Stainless steel needle

0.203 to 1.83 mm dia13 to 38 mm

lengths

Small, needle-typeprobes in various

diameters and lengths.

Industrial, laboratory,manufacturing andchemical research.Various size needle

probes suit temperaturemeasurements in

plants, liquids, semi-solids, food processingand natural sciences.surfaces, and more.

Model HYP-1 isautoclavable. Not

suitable for humanimplantation.

Individually in 5 stylesComes with or

without connectors.

SP-RL

£49

omega.co.uk

Various heavy-dutysurface probes

K, E, J

Various-dependson model

Various, includingexposed TC element

and SS sheaths

Various-dependson model number

Six rugged probestyles, PFA coated

lead wire, black andanodised aluminium

handle withhandle probes

General purpose, rollersurface, needle tip,

flexible tip andoverbraid models.

Individually with 1.8 mPFA coated lead

wire, SMPsubminiatureconnector.

KHSS-IM60G-RSC

£22

54

Metal sheathed probeswith easy-grip mouldedhandle and coiled cable

J, K, T, E, N

Probe to 525°CHandle to 115°C

Magnesium oxideinsulation with SS or

InconelTM 600 sheathing

1.5 to 9.5 mm dia300, 450 or 600 mm

lengths standard

Integral moulded handleretractable cable. General

purpose probe tip standard;air and penetration tips

available. Includes submin.male connector.

General purpose,penetration and airprobe tips available

Probe, handle, cableand connector set.Contact Sales for

special requirements.

HPS-CASS

£24.75

omega.co.uk

Metal sheathedprobes with

integral handle

J, K, T, E, N

To 980°C

Magnesium oxideinsulation with SS or

Inconel 600 sheathing

1.5 mm dia300 mm probelength standard

Integral pistol-griphandle Retractablecable. Heavy-duty.

General purposeimmersion, custom tips

available forpenetration, fastresponse surface

and air temperaturemeasurements.

Probe and handle set.Contact Sales for

special requirements

SP-HF-K

£143

omega.co.uk

Metal sheathedhigh temperature

foundry probes withintegral handle

J, K

To 1260°C

Glass braid insulationwith stainless steel

sheathing

12.7 mm dia25 mm dia tip762 mm probelength standard

Extra heavy-dutydesign with rugged.aluminium handle.

1.8 m SSoverbraided lead wires.

Heavy-duty tipspenetrate surfacemeasure casting

surface temperature.

Probe and handle set.Contact Sales for

special requirements

88000

£74

50

Special purposesurface probes

K, E

Various-depends onmodel 200°C

To 815°C

Various, includingexposed TC element

and SS sheaths

Various-depends onmodel number

Variety of sensing headsfor hundreds of

applications. Modelswith swivel head design

and replaceableelements

General purpose,straight and right angle

surfaces, rotatingsurfaces, insertion,small electronic part

Individually with SMPminiature male

connector, one-footretractable cable.

Thermocouple

9

Selection Guide

Series No.

Price

Page No.

Configuration

AvailableCalibration

TemperatureRange(Configuration andapplication dependent)

Insulation/Sheathing

Size(Non-standardlengths readilyavailable)

Features

Applications

Sold As

SPHT

£30

53

Metal sheathed high-temperature surface

probe withintegral handle

J, K, E

To 650°C

Magnesium oxideinsulation withSS sheathing

9.5 mm dia tip150 or 300 mmprobe lengths

standard

Spring-loadedsensing element.

Ceramic tip.Retractable cablewith mini plug.

High-temperaturesurface

measurements,stationary surfaces.

Individually.Contact Sales for

special requirements.90° Bend Version

Available.

RAT/SAT/BAT

£89

omega.co.uk

Ceramic tubeassemblies

R, S, B

To 1650°C

Ceramicprotection tube

6 or 9.5 mm300 mm

probe standardlength

Includes NB1-2head

High-temperatureoxidising or

reducingatmospheres.

Individually.

NB3, 5, 12

£28

56

Metal sheathed probeswith industrial

protection head andintegral terminal block

or transmitter

J, K, T, E, N

To 1335°Cmax 610°C

for PFS heads,290°C for plastic

headsMagnesium oxide

insulation with SS orInconelTM 600

sheathing

1.5 to 6.0 mm diaprobe. Variousdiameter wells.Various lengths.

Choice of industrial headswith integral terminal

blocks. Fixed/spring loaded.Choice of thermowell sizeand material. Head canhouse a transmitter.

Heavy-duty,industrial

environments.Sheathed or

non-sheathedthermocouple

elements fit intothermowell ifnecessary.

Individually withthreaded fitting and

head. Variety ofthermowell sizes,

designs andmaterials. ContactSales for specialrequirements.

(Probe) -PD

£27

omega.co.uk

Metal sheathedprobes with

weld pad

J, K, T, E

To 1150°C

Magnesium oxideinsulation with SS

or Inconel 600sheathing

1.5 to 6.0 mm dia25.4 x 19 x 3.2 mm

pad 300 mmlengths standard

Parallel, 90° orcurved weld padat tip of probe.

Variety ofterminations.

Permanentinstallations, probewelds to surface.

Individually.Flat or curved padsavailable. ContactSales for specialrequirements.

ADR

£18

omega.co.uk

Metal sheathedadjustable depth

probes

J, K, T, E

To 480°C

Glass braid on wireinside SS tip

4.7 mm diatip up to 75 mm tip

length 1500 mmcable length

standard

Flexible armoured cablewith sliding lock fitting.

Spring action catchholds probe firmly inplace. Grounded or

ungrounded junction.

Immersion, adjuststo any depth. Springloaded tip pressesagainst the bottomof a well for rapid

heat transfer.

Individually withpermanentlyattached or

removable lockfittings. Spade lugsor quick disconnect

termination.

TERP / SERP

£30

omega.co.uk

PFA and plasticextruder probes

J, K, T, E

To 900°C

Braided glass wirewith SS housing.HastelloyTM tip on

PFA models

3.2 mm dia tip;75 or 150 mmbarrel lengths;flush, 6, 13, 19

or 25 mmtip lengths

Rigid or flexibleconnection. Various

tip and barrellengths. Single or

dual elements.

PFA or plasticextruders.

Individually withOSTW standard

size maleconnector. Contact

Sales for specialrequirements.

CF, BT

£17.50

59

Metal sheathedbayonet andcompressionfitting probes

J, K, T, E

To 480°C

Glass braid on wireinside stainless

steel probe

Bayonet models:4.7 mm dia

57 and 89 mm Lprobe.

Compression fitting:50 and 100 mm L

probe.Straight or 90° bend

probes.

Variety of probelengths. 6.4 mm

flexiblestainless steel

cable 304 or 321SS construction.

Immersion, boredsamples, surfaces.

Individual spring-loaded bayonet or

compression fittingstyles. Contact

Sales for specialrequirements.

THERMOCOUPLES

10

style, but the ungrounded offerselectrical isolation. See table below.

The thermocouple in the exposed-junction style protrudes out of the tipof the sheath and is exposed to thesurrounding environment. This typeoffers the best response time, but islimited to dry, non-corrosive, andnon-pressurised applications.

What is response time?A time constant has been defined as “thetime required by a sensor to reach 63.2%of a step change in temperature under aspecified set of conditions. Five timeconstants are required for the sensor toapproach 100% of the step changevalue.” Exposed junction thermocouplesare the fastest responding. Also, thesmaller the probe sheath diameter, thefaster the response, but the maximumtemperature may be lower. Be aware thatsometimes the probe sheath cannotwithstand the full temperature range ofthe thermocouple type.

What is a thermocouple?A thermocouple is a sensor for measuringtemperature. It consists of 2 dissimilarmetals, joined together at one end,which produce a small unique voltage ata given temperature. This voltage ismeasured and interpreted by athermocouple thermometer.

What are the differentthermocouple types?Thermocouples are available in differentcombinations of metals or “calibrations.”The 3 most common calibrations areJ, K and T. There are high-temperaturecalibrations, R, S, B, and G, C, D. Eachcalibration has a different temperaturerange and environment, although themaximum temperature varies with thediameter of the wire used in the thermocouple.

Howdo I choose a thermocouple type?Because thermocouples measure inwide temperature ranges and can berelatively rugged, they are often used in

industry. The following criteria are usedin selecting a thermocouple:• Temperature range• Chemical resistance of thethermocouple or sheath material• Abrasion and vibration resistance• Installation requirements (mayneed to be compatible with existingequipment; existing holes maydetermine probe diameter).

How do I know which junction typeto choose? (also see diagrams)Sheathed thermocouple probes areavailable with 1 of 3 junction types:grounded, ungrounded, or exposed. Atthe tip of a grounded junction probe,the thermocouple wires are physicallyattached to the inside of the probe wall.This results in good heat transfer fromthe outside, through the probe wall tothe thermocouple junction. In anungrounded probe, the thermocouplejunction is detached from the probe wall.Response time is slower than the grounded

OMEGACLADTM

SpecificationsDiameters: Standard diameters:0.25 mm, 0.5 mm, 0.75 mm, 1 mm,1.5 mm, 3 mm, 4.5 mm, and 6 mm,8 mm and 9.5 mm.Length: Standard OMEGATM

thermocouples have 300 mmimmersion lengths.Other lengths are available.Sheaths: 304 SS and Inconel® arestandard. Other sheath materials areavailable; call for price and availability.Insulation: High-purity magnesiumoxide is standard. Minimum insulationresistance wire to wire or wire tosheath is 1 G-at 500 Vdc in diametersabove 1.5 mmCalibration: Iron-constantan (J),CHROMEGATM-ALOMEGATM (K),copper-constantan (T), andCHROMEGATM-constantan (E)are standard calibrations.Bending: Easily bent and formed.Bend radius should be not less thantwice the diameter of the sheath.

Delivery:Off-the-shelf. Other sheathsare available; call for price and delivery.Dual Elements: Thermocouples with asheath diameter of 1 mm through 6 mmare available in dual element.Accuracy: The wires used inOMEGATM thermocouples are selectedand matched to meet IEC Class 1Limits of Error. Thermocouples canbe made from 0.25 mm OD to 9.5 mmOMEGACLADTM thermocouple wire.Polarity: In the thermocouple industry,standard practice is to colour codeinsulated wires. Other standards thatOMEGATM uses are: the negativelead of bare wire thermocouple isapproximately 6 mm shorter than thepositive lead, and the large pin on athermocouple connector is always thenegative conductor.ExtensionWire: Thermocouple alloywire must always be used to connecta thermocouple sensor to theinstrumentation to ensure accuratemeasurements.

GroundedJunction,OMEGACLADTM

Probes

UngroundedJunction,OMEGACLADTM

Probes

ExposedJunction,OMEGACLADTM

Probes

Operating Atmosphere—Typical Sheath MaterialsMaximum Application Atmosphere

Material Temperature Oxidising Hydrogen Vacuum Inert304, 310, 316, 900°C Very Good Very Veryand 321 SS Good Good Good

1150°C Very Good Very VeryInconel® 600 Good Good GoodSuper 1335°C Excellent Good Very VeryOMEGACLADTM XL Good GoodPlatinum- 1650°C VeryRhodium Alloy Good Poor Poor Poor

2200°C NotMolybdenum Rec. Fair Good Fair

2300°C Not Not NotTantalum Rec. Rec. Good Rec.

An exposed junction is recommendedfor the measurement of static or flowingnon-corrosive gas temperatures wherefast response time is required. Thejunction extends beyond the protectivemetallic sheath to give accurate, fastresponse. The sheath insulation issealed where the junction extends toprevent penetration of moisture or gas,which could cause errors.

An ungrounded junction is recommendedfor measurementsin corrosive environments where it isdesirable to have the thermocoupleelectronically isolated from and shielded bythe sheath. The welded wire thermocoupleis physically insulated from the thermocouplesheath by MgO powder (soft).

A grounded junction is recommendedfor the measurement of static or flowingcorrosive gas and liquid temperaturesand for high-pressure applications. Thejunction of a grounded thermocouple iswelded to the protective sheath, givingfaster response than the ungroundedjunction type.

Introduction to Thermocouplesand Thermocouple Assemblies

Room Temperature Insulation ResistanceInsulation

Nominal Sheath Applied DC Resistancemm Voltage Min Min<0.80 50V 100 M-

0.80 to 1.5 50V 500 M->1.5 500V 1000 M-

11

From the tip of the sensor to the thermocoupleconnector and the instrumentation that reads thesignal, OMEGA takes ownership of the quality of ourproducts and manufactures not only the finishedthermocouple assembly but the individual componentsas well.

Insulated Thermocouple WireBare thermocouple wire can be insulated with a varietyof materials to accommodate different applications,whether it’s temperature, chemical resistance,abrasion resistance, or any number of otherrequirements. OMEGA’s wire insulating andmanufacturing capabilities include:

� Braiding� Thread Serving� Tape Wrapping� Cabling� Stranding� Plastic Extrusion

Mineral-Insulated, Metal-Sheathed CableOMEGA has dedicated an entire building to the solepurpose of manufacturing mineral-insulated,metal-sheathed cable. This cable manufacturing lineincorporates thermocouple wire, a metal sheath,and mineral oxide (MgO) insulation to producethe OMEGACLADTM used in our thermocoupleprobe products.

Thermocouple ConnectorsWe strive to make our products the best value for ourcustomers and nowhere is this better illustrated than inour thermocouple connector lines. With features like aremovable write-on window, spring-loaded contactwashers, and internal wire divider, our connectors makeassembly and use easy. To ensure quality and reliability,we’ve automated our connector manufacturing andperform over 20 quality checks during the process.

Thermocouple ProbesOMEGA insulates the wire, manufactures the mineral-insulated cable, and assembles the connectors. Weuse these components to manufacture our finishedthermocouple probes on our automated manufacturingline. At every opportunity, OMEGA invests in the latesttechnologies to bring innovative features and servicesto our customers. This commitment to manufacturingensures that a quality product, fabricated start to finishby us, is on the shelf ready for delivery to our customers.

Our PeopleOMEGA’s people are at the core of our manufacturingprocess. Everyone at OMEGA takes pride in theproducts they manufacture and provide to ourcustomers. They understand the need for quality andperformance, and above all else, they value servingthe customer.

Available as

Dual OMEGACLADTM Thermocouple Wire

Available inmultiple sizes!

One of OMEGA’s automated connector manufacturing lines

THERMOCOUPLES

12

Surface-Mountable,InsulatedWire ThermocouplesFor temporary or permanent attachment to almost anysurface, OMEGA offers insulated wire thermocoupleswith an insulating patch or a mechanical washercovering the measuring junction. The patch can bemounted using a self-adhesive backing, or it can becemented in place using one of our air set cements. Thewasher style surface mount can be bolted into place.Surface-mount wire thermocouples offer the benefit ofextremely fast response times. The SA1XL picturedbelow combines all the features of a self-adhesive stylethermocouple and a cement-on thermocouple with aresponse time faster than 0.15 seconds.

Surface ProbesOMEGA’s proprietary line of unique surface probes isoffered in over 50 styles for stationary, rotating, andmoving surfaces at temperatures up to 760°C. Theseprobes can be manufactured with custom lead lengthsand wire insulations, as well as a variety of handlematerials. In addition, OMEGA uses a proprietaryelement design to ensure that our customers receive arobust and reliable sensor.

Exotic Thermocouple ProbesFor applications that require temperaturemeasurements above 1260°C, the calibrations R, S, B,and C, manufactured using various combinations ofexotic/precious metals and insulating material, areemployed. These exotic thermocouple probes are usedat temperatures up to 2300°C. Ceramic sheaths arealso available for use with these calibrations.

Thermocouple AssembliesFor every temperature measurement application, thereis a thermocouple or thermocouple assembly that isbest suited to provide reliability, accuracy, andperformance. Here, we will look at variousthermocouple assemblies and their application.

� Bare Wire� Insulated Wire� Surface Mountable Insulated Wire� Handheld Surface Probe� Exotic/Precious Metals� MIMS (Mineral-Insulated, Metal-Sheathed)� Quick-Disconnect Style� Transition Joint Style� Handle Probe Style� Industrial Head Style� Innovations

Bare Wire ThermocouplesThe bare wire thermocouple is the most basicassembly available. It is composed solely of the twothermocouple wires beaded to create thethermocouple circuit. OMEGA offers bare wirethermocouples with individual wire diameters assmall as 0.0254 mm and as large as 3.25 mm.OMEGA stocks the base metal calibrations: J, K, T, E,and N, as well as precious metal calibrations: R, S, B,and C. OMEGA also offers a wide variety of insulatingproducts such as ceramic insulators and braidedfibreglass tubing for insulating of the bare wires.

InsulatedWire ThermocouplesOMEGA uses our in-house manufactured wire toproduce our line of ready-made insulatedthermocouples. These temperature sensors arestocked in a wide variety of terminations, insulatingmaterials, and lengths. OMEGA offers the largestselection of off-the shelf insulated wire thermocoupleson the market. Because we manufacture all thecomponents, custom lengths and configurations areeasily produced and quickly shipped.

Snap-on Strain Relief

Miniature-sizeconnector shown larger

than actual size.

Bead TypeThermocouple

SA1XL-KI-SRTC miniconnector, £64 per pack of 5,shown smaller than actual size,

see page 22

Bare sensing elementnominal, 0.025 mm thick

Fibreglass leadwire rated to482°C

CHAL-005, £11.50 per pack of 5, see page 14.

5SRTC-TT-KI-30-1M, £39.50 per pack of 5, see page 17.

SA1-JI-1M-SC, £50per pack of 5, see page 21.

Exotic thermocouplesfor high temperatures,see page 32 and 33

13

MIMS (Mineral-Insulated, Metal-Sheathed)ThermocouplesProbably the most versatile and widely usedtemperature sensors are the mineral-insulated, metal-sheathed thermocouples. They are most commonlyavailable in the base metal calibrations: J, K, T, E, andN. These probes are available with numerous sheathcompositions, including 304 SS, 310 SS, 316 SS, 321 SS,Inconel 600, and Super OMEGACLADTM XL. In addition,these probes are offered from stock with sheathdiameters from as small as 0.25 mm to as large as9.52 mm in both imperial and metric dimensions.Because OMEGATM manufactures the MIMS cable, weare able to provide almost any diameter within this range.

Quick-Disconnect StyleThe quick-disconnect style probe combines athermocouple connector with the MIMS probe. Thedesign allows the probe to be quickly connectedand/or disconnected from the measuring circuit. Thisstyle is available in various combinations ofconnectors and sheath materials.

Transition Joint StyleThe transition joint style probe incorporates the metalsheath probe with a built-in lead extension. OMEGA offersmany variations for immediate delivery or can easilycustommanufacture virtually any combination of sheathmaterial, calibration, lead insulation, and cold-endtermination to fit your application.

Handle Probe StyleThis probe style comes with a user-friendly handle,which is also the transition from the metal sheath to alead wire. Handles can be moulded on or mechanicallyassembled. This type of probe is commonly used inconjunction with a handheld meter such as OMEGA’sSupermeter. This allows the operator to perform spotchecks on manufacturing lines, in metal refining, infood and beverage production, in HVAC, or in anynumber of applications. To assist in the applications,the sensor tips come in different styles, such as an“air-hood” that protects the sensing junction whileallowing air flow or a reduced tip that allows the use ofa heavy-gauge sheath material while reducing thesensing tip size for a faster response time. There aremany styles available for various applications.

Industrial Head StyleThe industrial head style metal-sheathedthermocouple is commonly used in liquid or gas flowoperations such as petroleum refineries, wastewatertreatment, and natural gas production. The probefeatures a metal-sheathed thermocouple with awelded or brazed threaded fitting, which is attached toa plastic or metal head. The head contains a terminalblock and a wire exit port for connection to thetemperature monitoring system. The probe is“screwed” in the process, placing the sensor tip intothe media flow while maintaining a closed system.

InnovationsOur manufacturing capabilities give us the uniqueability to develop and bring to market innovativeproducts to meet or exceed the demands of ourcustomers. Products like:

� Moulded Mini Connector with Integral Strain Relief(page 17)

� Reel Caddy for Beaded Wire Thermocouples(page 18)

� Hermetically Sealed Thermocouple Probes(page 19)

� SA1XL Surface-Mount Thermocouples (page 22)� Super OMEGACLADTM XL Thermocouple Probes(page 26)

The Super OMEGACLADTM XL probe product line isthe result of years of development and refinement byour technical staff and responds to the voice of ourcustomers in product performance. It is designed forlow drift, high temperature, long life, and increasedperformance in smaller diameter probes.

SUPER OMEGACLADTM Sheath

MgO Insulation

Class 1Thermocouple Wire

TMQSS-IM100G-300, £19.25and JMQSS-IM100G-300,£19.25, see page 30

KHSS-IM60G-RSC-300,£25.50, see page 54

KMTSS-IM300G-300,£16.75, see omega.co.uk

KMTSS-IM050G-300,£19.25, see omega.co.uk

See omega.co.uk

for full range

of MI cable

THERMOCOUPLES

NB industrial head probes from £28, see page 56

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