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: [email protected]
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