Technical Data Lambda Transmitter LT 2-Ex Combination Probe KS1-D-Ex

Simultaneous measurement of oxygen (O2)

and oxidizing components (CO/H2)

In preparation

Sensors and systems for combustion engineering

LAMTEC SYSTEM BUS

Combi-ProbeKS1-D-Ex

O2

CO/H2

(Operation,Service)

to furtherLAMTEC devicesFMS / VMS / ETAMATICLT 1 / LT 2

RS 232

Analog inputsand outputs

Analog inputsand outputs

Digital inputsand outputs

Digital inputsand outputs

Fie

ldb

us

CA

N

Optional LSB modules

Probe ConnectionUnit PCU

Probe connection

Lambda-Transmitter

LT 2Ex

Hazardous areaFree hazardous area

Operating Conditions

The Lambda transmitter LT 2Ex is a microprocessor-based universal meter for directly measuring the concentration of O2 and the combustible oxidizing components of gas (CO/H2), displayed as CO equivalent (COe), in combustion systems in the leaner than stoichiometric range (l > 1), in conjunction with combination probe KS1-D-Ex. For installation in hazardous area, max. exhaust gas temperature 450 °C / 850 °F.

It has a facility for direct connection to the integrated/combustion management system and the ETAMATIC. This makes it possible to achieve improved control mode to ensure optimized oil and gas combustion and automatic adjustment of combustion to changing combustion conditions.

The Lambda Transmitter LT 2Ex also provides the following functions:

• Measuring the temperature of flue gas and intake air and calculating combustion efficiency

• Calculating and displaying CO2 concentration

• Load-dependent and fuel-specific limit curves / limit values

• O2-Control

• Field bus connection

Advantages

• Direct (in situ) measurement of oxygen (O2) and oxidizing off-gas components (CO/H2) in the crude gas up to 450°C

O2 measurement range 0 to 21% vol. in conjunction with

COe measurement range: 0 to 10,000 ppm LT 2Ex

• No connection with infiltrated air (COe)

• No gas preparation required, measurement direct in the wet flue gas

• Setting time to 60% value (T60) < 10 seconds with standard sampling COe < 2 seconds

• Measuring gas temperature up to 450 °C / 850 °F

• Low calorific output 22 W

• Universal application

• Easy to use probe plugs in

• Low-maintenance

Components required

The measuring system is available in different models.

It consists of the following components:

Explosion-proofed Combination Probe KS1-D-Ex

For max. permissible exhaust gas temperature of 450 °C / 850 °F ATEX 11 2 G based on:

ATEX certification EXAM …. EEx d 11 B + H2 T3 relating to enviroment temperature of 60° C / 140 °F!

Electrically connection

Counter flange DN80 / PN40 or bigger

Head of the probe with sensor and sintered filter

Vent with flame barier

Host connector reference gas Host connector calibration gas

Tube of the probe with temperature sensor

The combi probe KS1-D-Ex records the values measured. It sits directly in the exhaust gas flow. Measurement is carried out directly in the probe.

The electronics are to be installed in an non-explosion area unless they have been installed in a suitable ATEX-approved housing (EEx d or EEx p) by a manufacturer who was authorised to do so and a separate certificate has been provided in connection with this.

The ZrO2 measurement cell sits at the tip of the probe underneath the sintered metal filter. The wiring between the combi probe KS1-D-Ex and the LT 2Ex lambda transmitter is carried out using conventionally shielded cable.

Combi Probe KS1-D-Ex

Immersion depth X Type KS1-D-Ex1 Type KS1-D-Ex2

500 mm

656 R 4000

656 R 4010 860 mm 656 R 4005 656 R 4015

Lambda-Transmitter LT 2Ex

• In wall mounting case IP 66 for installation in free hazardous area

alternatively

• On installation plate for installation in free hazardous area or in

• EEx d-case (optional) for installation in Ex-Area

Lambda-Transmitter LT 2Ex in wall mounting case IP66

Lambda-Transmitter LT 2Ex on installation plate

Lambda-Transmitter LT 2Ex in EEx d-case

Probe connection unit (PCU)

In version EEx-e near at the probe EG-prototype verification certificate according to PTB 00 ATEX 1063

• For connecting the probe at LT 2Ex.

• For connecting the reference gas and the calibration gas.

• For adjustment of the air flow.

• NAMUR limit contactor for monitoring of the flow of the reference air in version EEx-ia IIC according to DMT99 ATEX E 104 X

On installation plate In wall mounting case IP66

Theoretical basis of the principle of measurement

The combination probe KS1-D-Ex consists mainly of a zirconium dioxide electrochemical cell.

It has 3 electrodes

• an O2-sensitive platinum electrode

• a CO/H2-sensitive electrode made from a platinum/noble metal alloy

• a platinum reference electrode

Probe principle - O2 - sensitive electrode

CO/H electrode (Pt / noble metal alloy)

2

Gas inlet Reference electrode (Pt)

Protective coating

Zirconium oxide ceramic

HousingO -selective

reference electrode (Pt)2

US

UH

Diagram showing the structure of the combination probe KS1-D-Ex

The O2 measuring cell acts as an electrochemical concentration cell and generates a d.c. voltage which is dependent upon the absolute temperature T and the logarithm of the O2 concentration ratio or O2 partial pressure ratio at the reference and outer O2 electrode.

If the sample gas is fed to the outer electrode and a reference gas with a known O2 concentration, such as air for example (20.96%), is fed to the inner electrode, if the temperature is kept constant, this will give the logarithmic relationship, shown below, between the probe voltage US and the concentration of oxygen in the sample gas.

120

100

80

60

40

20

00 1 2 3 4 5 6 7 8 9 O (%)2

U (

mV

)S

ens

or

pO2 (G)Us = 0,049 T log

pO2 (L)

O 2 [%] = 20,96 10

U

0,049 T

s

.

Sensor characteristic Us = f (O2 )

Probe principle - CO/H2 - sensitive electrode

Combustible components are adsorbed as oxygen molecules at the electrode and diffuse to the "three-phase limit" formed by measuring gas, electrode and zirconium dioxide. In addition to the Nernst voltage U-O2 determined by the oxygen content, the combustible components present generate an additional d.c. voltage U-CO / H2 through the sensor. The sensor voltage is the sum of the two voltages US = U-O2 + U-CO/H2 (Fig. 1). Even with low concentrations of oxidizing gases such as H2 or CO, the mixture potential is much higher than the O2 signal. The mixture potential forms very quickly, T60 times of less than 2 seconds are achieved.

Sensitivity to O2 and combustible components can be influenced by the temperature of the sensor. Lower sensor temperatures bring about higher sensitivity to CO/H2 and lower sensitivity to O2 (Fig. 2).

The concentration of oxygen also influences the sensor voltage U-COe. With higher O2 content, the sensor voltage in the high CO range drops slightly (Fig. 3).

However, the combination probe KS1-D-Ex may not be used when it is too cold or else the oxidizing components will influence the O2 measurement (falsification of the measurement value to lower values because of oxidation of the non-burned flue gas components on the O2 electrode).

Us

(mV)

CO

Sensor characteristics (measured)

Nernst characteristic (calculated)

O (%)2

incomplete

combustion

complete

combustion Fig. 1: Characteristic at a gas burner

Fig. 2: Sensor voltage U-COe as a function of sensor temperature (heat output)

With higher O2 concentrations, more non-burned residue (CO/H2) oxidizes before it reaches the 3 phase limit. The effect of sensor voltage U-COe as a function of the O2 content is shown in the graph below.

1000

800

600

400

200

00 2000 4000 6000 8000 10000

CO [ppm]

9,5 % O

62

% O2

U [

mV

] C

Oe

at starting point with 0% CO

Fig. 3: Sensor voltage U-COe as a function of O2 content

It is therefore recommended that the characteristic is calibrated specifically for the system with a CO reference measurement.

Another indicator for non-burned residue (CO/H2) on combustion systems is the dynamics of the sensor signal (US). The higher the content of non-burned residue, the higher the dynamics. The following figure traces the rise of the sensor signal over the O2 value measured on a reference system (12 MW SAACKE gas burner) with a small load.

small load

700

400

600

300

500

200

100

00 31 42 5 6

2

40

300

O ref. [%]2

CO

[p

pm

]

U [

mV

]S

enso

r

Signal dynamic

> 100 mV+

Fig. 4: Quick-response O2 measurement combined with the detection of oxidizing flue gas components (non-burned residue) CO/H2.

Technical data of Lambda Transmitter LT 2Ex

Model: Wall mounting case

Installation plate

Case Sheet steel housing, powder-coated

Sheet steel, galvanised

Protection class according to DIN 40050

IP 66 IP 00

Dimension (HxWxD) mm 500 x 300 x 200 400 x 258 x 131,5

Colour grey RAL 7032 -----

Weigth approx. 15kg approx. 7kg

Ambient temperature Operation Transport and storage

-20 °C ... + 60 °C / -36 °F...140 °F -40 °C ... + 85 °C / -70 °F...185 °F

Line voltage 230 V AC und 115 V AC + 10 % / -15 %, 48 Hz...62 Hz CAUTION: To be used only in grounded power line networks!

Power consumption Typ. 50 VA, briefly 150 VA (probe heating-up phase)

Display LCD-Graphic display 100 x 80 mm (H x W)

Resolution O2: 0,1 Vol. % O2 in the range 0...18 Vol. % O2 1 Vol. % O2 in the range 18...30 Vol. % O2

CO: 1ppm in CO-range

Measuring accuracy: (with combi probe KS1-D-Ex)

O2: +/- 5 % of measurement value

Not better then +/- 0,30 Vol.%

In Exhaust gases of natural gas firing after calibration under system conditions with a CO reference measurement

COe: +/- 25 % of measurement value

Not better then +/- 10 ppm after calibration under system conditions with a CO reference measurement Measuring range 0...100 ppm : max. 10 ppm

Setting time (60 % time) O2: T 60 < 10 s

COe: T 60 < 2 s

Time to readiness for operation with KS1-D-Ex (coldstart)

10 minutes after „POWER ON“

Analog outputs

Monitor output 0...2,55 V DC, burden > 10 kΩ, ≤ 100nF

Accuracy 2 % of measurement value, not better then 0,2 Vol. % O2

Resolution 10 mV

Factory setting 0...2,55 V DC ≈ 0...25,5 Vol. % O2

Can be switched via DIP-switshes to probe voltage US

US 0...255 mV DC ≡ 0...2,55 V

1...4 Current- / Voltage output 2 Standard, 3...4 Option

Direct current 0 / 4...20 mA

Burden 0...600 Ω

Dirct voltage 0...10 V

Burden ≥ 10 kΩ

Non floating (floating optional)

Accuracy Measuring range and physical quantities can be configured 0,5 % of measurement value, not better then 0,2 Vol. % O2

Resolution 0,1 Vol. % O2

Factory setting Analog output 1: 0...10 Vol.% O2 4...20 mA, Analog output 2: 0…1000ppm 4…20mA

Analog inputs 1...4 optional via plug-im cards on LT 2Ex-base electronic

• Universal module LT 2Ex Potentiometer 1...5 kΩ 6 57 P 6000

• Universal module 0 / 4...20 mA 6 63 P 6001

• Universal module for PT 100 sensor 6 57 R 0890 Temperature range 0...320°C/610°F / 0...850°C/1560°F Resolution 1°C

Factory setting Analog input 1: 0...20mA CO/H2-electrode of the probe

Controls

• Multi function key, maintenance switch and 2 LED – rows à LED´s

• Display- and control unit with LCD Graphic display

• Remote-Display-Software (Option)

Interface • LAMTEC SYSTEM BUS

• RS 232 only in conjunction with interface module 6 63 P 0500

Digital outputs 1 standard

Relay output (collective fault) 0...230 V AC, 4A / 0... 48 V DC, 3A

optional:

Relay module with 6 relays (1 change-over contact)

Breaking capacity 0...230 V AC, 4A / 0... 48 V DC ,3A

657 R 0857

Free configurable to operating-, status- and limit messages

Digital inputs 8 inputs, can be configured in any way

Default setting: 24 V d.c. with reference to device potential can be switched to floating via plug-in jumpers for external voltage source.

Fieldbus connection Optional for the following systems:

• Profibus DP (Siemens)

• Interbus-S (Phoenix)

• Modbus

• CANopen

• Ethernet

Conformity with the following European Guidelines

89 / 336 / EWG Electromagnetic compatibility

73 / 23 / EWG Electrical equipment within specific voltage limits

Technical data of the combination probe KS1-D-Ex

Range O2: 0...18 Vol. % O2 with limit 0...21 Vol. % O2

COe: 0...10000 ppm Coe

Accuracy O2: +/- 5 % of measurement value

Not better then +/- 0,30 Vol.%

In Exhaust gases of natural gas firing after calibration under system conditions with a CO reference measurement

COe: +/- 25 % of measurement value

Not better then +/- 10 ppm after calibration under system conditions with a CO reference measurement Measuring range 0...100 ppm : max. 10 ppm

Gas extraction Direct at the flue gas channel (InSitu)

Probe output voltage O2-electrode: -100mV...+1000mV Resolution: 0,1mV

CO/H2-electrode: -50...+950mV Resolution: 1mV

Error influences Temperature, other non-burned hydrocarbons

Cross-sensitivity to SO2, NH3, NO, propane, aromatic hydrocarbons

Internal cell resistor of the ZrO2-cell in air and 22W heating power

15...25 Ohm

Permissible combustions Faints free aerielly hydrocarbons Light oil Coal Wood Heavy oil

Weight 9,5kg

Service life ≥ 3 years in natural gas

Heating power 22 Watt, depending on design and temperature of the gas measured

Heating current ca. 1,3 A

Isolation resistor between heating and sensor connection

> 30 MΩ

Installation position Horizontal to vertical

Ambient temperature -20 °C ... + 60 °C / -36 °F...140 °F

Perm. flue gas temperature < 450°C

Suitable for ATEX II 2 G

Protection code IP42 EEx d IIB + H2 T3 prototype testing in preparation

Material Probe /-parts Counterflang Sintered filter

1.4571 1.4571 1.4404 CrVi-Stahl

Proof pressure sintered filter 26 bar (g)

Electrical connection

321

PE

NL

=

==

/ 250 G [230 V]/ 250 G [115 V]

1

0- 42V DC 3A0-230V AC 2A

F1 T1A T2A

Lambda Transmitter LT 2Ex

26252423

22212019

*

(+)(-)

(+)

(-)

(+)

(-)

(+)

(-)

(+)

(-)

*

*

*

3231

Monitor output 0...2,55V DC

can be switched toO measured value

probe voltage2

LAMTEC SYSTEM BUS

(floating)

7574737271

4948

4746

4544

4342

LAMTEC SYSTEM BUS

(CAN-BUS)

CAN Low

CAN High

n.c.

n.c.

CAN-GND

4...20 mA

4...20 mA

not populated

0...1000ppm

0...10% O2

e.g. for connecting a multimeter for

servicing purposes Ri > 10 kOHM

not populated

Analog iputs

0/4...20mA

0...10V

Temperature

Pressure

not populated

not populated

Module 4

Module 3

Analog outputs

0/4...20mA

0...10V

* = on processor

board

Module 4

Module 3

Module 2

Module 1

Relay output 1

ON

e.g. collective fault message

(can be configured in any way)

default setting zero signal current principle

Earth

Connecting power typ. 50 VA

briefly (probe heating phase) approx. 150 VA

Neutral conductor

Phase 230 / 115 V, 48…62 Hz

+

-

Digital inputs

24 V, approx. 6 mA

Jumper BR 106, BR 107 on

power electronics

1-2 with ref. to potential

(below)

2-3 floating (above) for

external voltage source

60

696867

666564636261

12

35

34

33

2

3

4

5

6

7

8

9

10

1

PCU

Sensor signal -O2

Sensor signal +

Sensorheating

Sensorheating

PT100

PT100

KS1-D-Ex1

2

3

4

5

6

1

PT100

PT100Ref.Air Cal.Gas

(-)

(+)

(-)

Heating

Term. 17

+

Probe connectionKS1-D-Ex

Heating 36

Analog input 2

voltage

internal wiredTerm. 16

-

4

3

2

1

X2

4

3

2

1

X2

Relay-output

supply voltageDC 24V internal +

-

PT100 input

Analog output0-2,5V at 0-500°C +

Temperature

monitoringbuilt-in in LT 2Ex

3

7

9

1

14

15

NAMURinput

Relay-output

supply voltageAC230V internal

Isolated switch

amplifier

Sensor signal -CO

Flowmeter withmonitoring of the

flow 40...60l/h

Compressed air asreference air

pre pressure 1bar

Flowmeterflow 40...60l/h

+-

LambdaTransmitter LT 2 Ex1

with temperature monitoring

12 12

24V DC

24V DC

input 8

input 7

input 6input 5

input 4

input 3

input 2

input 1

GND

Sensor signal -O

Sensor signal +

Sensorheating

Sensorheating

Sensor signal -CO

Compressed air or testgasas calibration gaspre pressure 1bar

built-in in LT 2Ex

+

-

Digital inputs

24 V, approx. 6 mA

Jumper BR 106, BR 107 on

power electronics

1-2 with ref. to potential

(below)

2-3 floating (above) for

external voltage source

60

696867

666564

6362

61

12

35

34

33

2

3

4

5

6

1

PCU

Sensor signal -O2

Sensor signal +

Sensorheating

Sensorheating

KS1-D-Ex2

2

3

4

1

Ref.Air Cal.Gas

(-)

(+)

(-)

Heating

Probe connectionKS1-D-Ex

Heating 36

3

7

9

1

14

15

NAMURinput

Relay-output

supply voltageAC230V internal

Isolated switch

amplifier

Sensor signal -CO

Flowmeter withmonitoring of the

flow 40...60l/h

Compressed air asreference air

pre pressure 1bar

Flowmeterflow 40...60l/h

+-

LambdaTransmitter LT 2 Ex2without temperature monitoring

12 12

24V DC

24V DC

input 8

input 7input 6input 5

input 4input 3input 2

input 1GND

Sensor signal -O

Sensor signal +

Sensorheating

Sensorheating

Sensor signal -CO

Compressed air or testgasas calibration gaspre pressure 1bar

built-in in LT 2Ex

Relay module for digital outputs (optional)

Relay module 657 R 0857

terminal strip X2

Lambda Transmitter LT 2Ex

Relay-

output 7

18

16

17

15

13

14

12

10

11

9

7

8

6

45

3

1

2

Relay-

output 6

Relay-

output 5

Relay-

output 4

Relay-output 3

Relay-

output 2

Relay-

outputs

2-7

Max. 230VAC

4A

d7

d6

d5

d4

d3

d2

Interface module

only in conjunction withremote display software

RS 232- 6 57 R 1101

RS 422 - 6 57 R 1100

Connector for 25 PIN interface module

Dimension combination probe KS1-D-Ex

length 450 – 860 mm

approx. 200mm

Dim

ensio

n L

amb

da T

ransm

itter LT

2Ex in

wall m

ou

ntin

g case

Stahlblechgehäuse 500x300x200mm

Schutzart IP66Farbe RAL7032

Sheet Steel Housing 500x300x200mm

Protection Code IP66

Colour RAL7032

Stahlblechgehäuse 500x300x200mmSchutzart IP66Farbe RAL7032

Sheet Steel Housing 500x300x200mm

Protection Code IP66Colour RAL7032

Dimension Lambda Transmitter LT 2Ex on installation plate

Dimension EEx d-case (optional)

Nominal voltage: AC 690 V Protection class: IP65 Material: Aluminium aloy,

low copper contents Cable glands: 6x EEx d

M20 Dimension outside: B380 x

H560 x T245mm Dimension inside: B305 x

H490 x T160mm Weigth: 27 kg

M8 x 17mm depth

235mm

360mm

Dimension probe connection unit on installation plate

Dimension probe connection unit in all mounting case IP66

Item numbers measurement

6 57 R 1025 KS1D Ex1 LT 2Ex 1 in wall mounting case with temperature monitoring

6 57 R 1025 KS1D Ex2 LT 2Ex 2 in wall mounting case without temperature monitoring

6 57 R 1030 KS1D Ex1 LT 2Ex 1 on installation plate with temperature monitoring

6 57 R 1030 KS1D Ex2 LT 2Ex 2 on installation plate without temperature monitoring

6 56 R 4000 (500mm) KS1-D-Ex 1 with calibration gas connector for semi automatically configuration and PT100 temperature monitoring

6 56 R 4005 (860mm) KS1-D-Ex 1 with calibration gas connector for semi automatically configuration and PT100 temperature monitoring

6 56 R 4010 (500mm) KS1-D-Ex 2 with calibration gas connector for semi automatically configuration, without PT100 temperature monitoring

6 56 R 4015 (860mm) KS1-D-Ex 2 with calibration gas connector for semi automatically configuration, without PT100 temperature monitoring

6 50 P 4025 Probe connection unit (PCU) on installation plate

6 57 R 1070 Probe connection unit (PCU) in wall mounting case IP66

Item numbers spare parts

6 57 R 1882 Base electronic for LT 2Ex

6 57 R 1310 Reserve fuse box for LT 2Ex

6 57 R 1874 Processor board for LT 2Ex

6 57 R 0833 Display and operation unit for LT 2Ex

6 57 R 0050 Analog output module 0/4...20 mA, 0...10 V for LT 2Ex

6 57 R 6001 Analog input module 0/4...20 mA for LT 2Ex

6 56 R 0100 Buffer amplifier –50...+950mV 0...20mA for LT2

6 53 P 4403 Flowmeter 0 – 80 l/h for calibration gas for PCU

6 57 R 0070 Flowmeter with NAMUR-limit contactor for reference air for PCU

6 50 R 4025 Probe connection box for PCU

Item numbers options

6 57 R 0165 EEx d-case for EX-Area 1 and 2

6 57 R 1101 Remote-Display-Software incl. Interface module RS 232 for PC

6 63 R 9002 Interface module RS 422 / 485 instead of RS232 module

6 57 R 0890 Temperatur input module for PT-100, e.g. for measuring the flue gas temperature

6 57 R 0891 Temperature sensor PT 100, lenght 250 mm

6 57 R 6000 Analog input module for LT 1 / LT 2 Potentiometer 1...5 kΩ

6 63 R 6002 Analog input module 0/4...20 mA with suppla voltage 24 V DC for contactor

6 63 R 6005 Analog input module 0/2...10 V

6 57 R 0051 Analog output module 0/4...20 mA, 0...10 V, floating,

max. potential difference ± 20 V

6 60 R 0017 Relay module with 6 relays (as spare part without connecting cable)

6 57 R 0857 Relay module with 6 relays (with connecting cable)

6 57 R 0920 Load-dependent and fuel-specific limit curves/limit values incl. analog input module and 1 relay module 657 R 0857

6 57 R 0910 Calculation of CO2 concentration

6 57 R 0895 Flue gas temperature measurement and efficiency calculation

6 57 R 1120 Integrated PID O2 – controller

6 57 R 1124 Output of the internal load via analog output 2 (only in combination with ETAMATIC/FMS/VMS)

6 63 R 0401LT BUS connection for Profibus DP

6 63 R 0402LT BUS connection for CANopen

6 63 R 0403LT BUS connection for Modbus

6 63 R 0405LT BUS connection for Interbus-S

LAMTEC Meß- und Regeltechnik für Feuerungen GmbH & Co KG Impexstraße 5 D-69190 Walldorf Telefon (+49) 06227 / 6052-0 Telefax (+49) 06227 / 6052-57 Internet: http://www.lamtec.de e-mail: info@lamtec.de

LAMTEC Leipzig GmbH & Co KG Schlesierstraße 55 D-04299 Leipzig Telefon (+49) 0341 / 863294-00 Telefax (+49) 0341 / 863294-10

Überreicht durch: Docu no..: D LT 3011.06 aE - 0002 Printed in Germany