Technical Data Lambda Transmitter LT2-Ex Lambda Probe LS2-Ex Non-explosive atmosphere Explosive atmosphere Lambda Transmitter LT2-Ex Lambda Probe LS2-Ex O2 Probe Connection Unit PCU O2 (Operation, Service) Optional: CANopen Modbus Profibus DP Ethernet LSB Fieldbus RS 232 Probe connection Analog inputs Analog outputs Digital inputs Digital outputs LAMTEC SYSTEM BUS to further LAMTEC devices FMS / VMS / ETAMATIC LT 1 / LT 2 Sensors und Systems for Combustion Engineering Digital inputs Digital outputs Analog inputs Analog outputs Optional LSB-modules System overview In conjunction with the LS2-Ex lambda probe, the LT2-Ex lambda transmitter is an O2 measuring system for continuously measuring the concentration of O2 in noncombustible gases in the leaner than stoichiometric range. The LS2-Ex combination probe is encased in a flameproof enclosure and can be employed in explosive atmosphere 1 and 2 in accordance with their specifications. EX area 1 II (2) G for the temperature monitoring II 2 G EEx d 11B + H2T3 (160°C) for the probe EX area 2 EEx d 11B + H2T3 (160°C) for the probe If the measurement system is to be used in a different way and the function of the device cannot be deemed correct for this application, the manufacturer should be consulted beforehand. There is the possibility of a direct coupling with the compound/firing management system and the Etamatic. This actually makes the realization of improved rule procedures for the optimization of oil and gas firings and for the automatic adjustment for the firing possible changing burn conditions. Additionally to the O2 measurement the LT2-Ex offers the still following functions: • • • • • Advantages: Measurement of flue gas and intake air temperature, and calculation of the efficiency of combustion Calculation and display of the concentration of CO2, calculated for the specific fuel on the basis of the measured O2 value and the max. CO2 value Load-dependent and fuel-specific limit values/limit curves Integrated PID-O2 controller (Outputs 1 and 2) max. potential difference 20 V configurable as desired Direct current 0/4...20 mA, burden 0...600W • • Digital outputs in conjunction with relay module Field bus connection • • • • • No gas conditioning required, measurement directly in the damp flue gas Adjustment time at a value of 90% (T90) < 20 seconds Measuring gas temperature up to 450°C Low heat output 15...25 watts According to the age and condition of the zircon dioxide measurement cell in each case Suitable for universal use Easy to use Low-maintenance • • • System components Necessary components The measuring system consists of the following components: • Explosion-proof measuring lambda probe LS2-Ex combination probe for a max. permitted exhaust gas temperature of 450°C based on: EX area 1 II (2) G for the temperature monitoring II 2 G EEx d 11B + H2T3 (160°C) for the probe EX area 2 EEx d 11B + H2T3 (160°C) for the probe based on an environment temperature of 60°C ! • Probe connection unit (PCU) in Ex-e version in vicinity of the probe to EC Type Approval Certificate according to PTB 00 ATEX 1002 - for connecting the probe to LT2-Ex. - for connecting the reference air and calibration gas. - for setting the air quantities. - NAMUR limit value transducer for monitoring the flow rate of reference air in the EEx-ia IIC version to DMT99 ATEX E 104 X System components • LT2-Ex lambda transmitter in IP 65 wall-mounted housing for installing outside the explosive atmosphere or • in panel mounting case for installing outside the explosive atmosphere System components or • on mounting plate for installing in the control cabinet for installing outside the explosive atmosphere • or in EEx d-case for build-in the LT2-Ex on mounting plate for installing inside the explosive atmosphere - flameproof encapsulation - Zone 1 and zone 2 Gas groups IIA and IIB Temperature class T4, T5 or T6 - Ex II2G EEx d IIB T4, T5, or T6 Certificate: CESI 02 ATEX097 - Protection code IP65 Theoretical basis of the principle of measurement In essence, the LS2-Ex Lambda probe consists of a zirconium dioxideceramic electrochemical cell. The cells operates as an electrochemical concentration chain, and generated direct voltage that depends on the absolute temperature T and the logarithm of the O2 concentration or the O2 partial pressure ratio at the inner and outer electrodes. If the outer electrode is supplied with the test gas and the inner one with a reference gas with a known O2 concentration, such as e.g. air (20.96%), then assuming the temperature is held constant, we obtain the logarithmic relationship between probe voltage E and the oxygen concentration of the test gas shown below. The characteristic curves for two different temperatures T1 and T2 show clearly that when using the voltage probe, the temperature affects the measured value in the cell's active part. In addition, the curves show that the probe is preferentially suitable for measuring low oxygen concentrations, since sensitivity and accuracy increase with decreasing O2 concentration because of the logarithmic relationship. Since the measurement of high O2 concentrations is subject to high error due to the low voltage dependence, it is not possible to use, for example, air (20.96% O2 ) to calibrate or tune the probe. Each LS2 Lambda probe is tested at the factory under real-life conditions, in a gas-combustion system with an exhaust temperature of ca. 150°C. The test protocol is enclosed with each probe. The sensor temperature recorded in the protocol should be input into the LT2 during commissioning. Calibration with test gases is not required. During operation it is possible to check and compensate for the measured values through countermeasurement. Theoretical basis of the principle of measurement The curve shown below demonstrates that oxygen measurements require knowledge of the proportionality factor and of the probe's temperature. In practice this means that the probe's tuning is possible simply through air voltage compensation (offset compensation), and entering the cell temperature obtained during final testing in accordance with the test protocol enclosed with the probe (usually ca. 1000 K) during commissioning with the LT2-Ex. The probe's logarithmic characteristic depends on cell temperature and on each probe's individual curve. The temperature of the solid electrolyte and of the electrodes affects the probe's signal, however the probe is heated with constant current to ca. 730°C. The temperature of the measured gas and the installation site affect the cell's temperature only slightly. Hence, probe temperature needs to be neither measured nor regulated. Individual deviations are compensated for during commissioning by adjusting the air voltage (offset compensation) and entering the sensor temperature obtained during final testing and recorded in the test protocol. The probe can only be used up to a gas temperature of 450°C. Probe ageing in long-term operation leads to a stretching of the characteristic curve. However, this can be recognised from the fact that the internal resistance increases. The probe should be replaced every 2 heating periods, however no later than after 10.,000 hours in operation. CAUTION! The test gas used for adjustment must be free from oxidizable constituents such as CO; NO; etc. Oxidizable constituents will oxidize at the platinum electrode (heated to 730°C) and corrupt the adjustment. It is recommended to use test gas with 2...5% by volume O2 in N2. Options Lambda Transmitter LT2-Ex • Remote-Display-Software • Measurement of flue gas and intake air temperature, and calculation of the efficiency of combustion • Calculation and display of the concentration of CO2, calculated for the specific fuel on the basis of the measured O2 value and the max. CO2 value • Load-dependent and fuel-specific limit values/limit curves Limit curves (factory setting) parameterised to undershoot, or alternatively two fuels with four limit curves each/two limit values per fuel • Integrated PID-O2 controller • 1...4 Analog outputs 0/4...20mA, 0...10V Can be retrofitted at any time by means of plug-in cards on the LT2-Ex processor board (max. 4) (Outputs 1 and 2) max. potential difference 20 V configurable as desired Direct current 0/4...20 mA, burden 0...600W Direct voltage 0...10 V, burden ≥ 10 kΩ • Output of the internal load via an. output 2 (only in con. with ETAMATIC / FMS /VMS) • Digital outputs in conjunction with relay module 657R0857 • via internal relay module (6 relays – 1 change-over contact) Switching capacity 230 V AC / 2 A, 48V DC / 3A • 1...4 Analog inputs can be retrofitted at any time by means of plug-in cards, eg. for temperature input, pressure sensors, etc. • Fieldbus connection for Profibus DP Ethernet Modbus Technical Data for Lambda Transmitter LT2-Ex Design: Housing: Wall-mounted housing Type 657R102 / LS2 / Ex1 / a1 657R102 / LS2 / Ex2 / a1 Panel-mounted housing Type 657R104 / LS2 / Ex1 / a1 657R104 / LS2 / Ex2 / a1 Sheet steel 3 HE/50 TE Panel-mounted housing Type of protection in IP 65 accordance with DIN 40050 IP 00 IP 20 Dimensions (h x w x d) mm 400 x 300 x 150 350 x 258 x 131.5 173 x 310 x 270 Colour Grey RAL 7035 ----- Silver metallic (anodized aluminium) Operating elements grey Weight approximately 11 kg approximately 6,3 kg Approximately 5 kg Ambient temperature: Operation Transportation and storage Surface-mounted housing made of sheet steel, powder-coated Mounting plate Type 657R103 / LS2 / Ex1 / a1 657R103 / LS2 / Ex2 / a1 - 20 °C...+ 60 °C - 40 °C…+ 85 °C Auxiliary power supply: 230 VAC and 115 VAC + 10%/- 15%, 48 Hz...62 Hz Power consumption: Typically 50 VA for short periods 150 VA (heating-up phase for probe) Display: LCD graphic display 100 x 80 mm (w x h) Resolution: 0.1% by volume O2 in the range 0...18% by volume O2 1% by volume O2 in the range 18...30% by volume O2 Accuracy of measurement: (with LS 2Ex/LS 2ExKV lambda probe) ± 5% of the measured value not better than ± 0.2% by volume O2 Adjustment time (90% time): T 90 < 20 s Time until ready for operation with LS 2Ex approximately 10 minutes after “POWER ON“ Technical Data for Lambda Transmitter LT2-Ex Analogue outputs: Monitor output 0...2.55 VDC, output load > 10 kΩ, ≤ 100 nF Accuracy 2% of the measured value, not better than 0.2% by volume O2 Resolution 10 mV Factory settings 0...2.55 VDC ≈ 0...25.5% by volume O2 DIP switches can be used to switch to : probe voltage U-O2 0...255 mVDC ≡ 0...2.55 V Internal cell resistor Ri 0…255 Ω ≡ 0...2.55 V 1...4 current/voltage outputs 1 standard, 2...4 optional Direct current 0/4...20 mA Output load 0...600 Ω Direct voltage 0...10 V Output load ≥ 10 kΩ not floating (isolation optional) Accuracy: Measurement ranges and physical quantity can be configured 0.5% of the measured value, not better than 0.1% by volume O2 Resolution: 0.1% by volume O2 Factory setting: 0...10% by volume O2 ≡ 4...20 mA Analogue inputs: optional via plug-in cards on LT 2Ex power supply unit electronics Analogue input card 0...+2900mV (from January 2007) Type 6 57 P 0661 Analogue input card LT 2Ex Potentiometer 1...5 kΩ Type 6 57 P 6000 Analogue input card 0/4...20 mA Type 6 63 P 6001 Analogue input card 0/4...20 mA with 24 VDC supply for sensor Type 6 57 P 6002 Temperature input for Pt 100 sensor Type 6 57 R 0890 Operating elements: • • • • Multi-function switch , maintenance switch 2 rows of LEDs, display and operating unit Interface: LAMTEC SYSTEM BUS RS 232 only in conjunction with interface module 6 63 P 0600 Technical Data for Lambda Transmitter LT2-Ex BUS connection: Optional for the systems Profibus DP (Siemens) Ethernet Modbus Digital outputs: 1 standard + 6 optional 1 relay output 0...230 VAC, 4 A Group fault display 0... 42 VDC, 3 A Optional: Relay module with 6 relays (1 change-over contact) Switching capacity 0...230 VAC, 4 A 0... 48 VDC, 3 A Type 657 R 0857 freely configurable for operating, status and limit value messages Digital inputs: 8 inputs – freely configurable Factory settings: 24 VDC referring to equipment potential can be switched to floating via plug-in jumper for external voltage sources Cold start delay: Automatic cold start delay 10 mins Conformity with the following European directives: 2004 / 108 / EC 2006 / 95 / EC Electromagnetic compatibility Electrical equipment within specific voltage limits Technical Data for Lambda Probe LS2-Ex Surface mounting Zircon sensor installed in the top of the probe with fitted stainless steel sintered metal filter performed as flame arrester Measurement range 0...10% by volume O2, with restriction 0...21% by volume O2 Accuracy of measurement ± 5% of the measured value, not better than ± 0.2% by volume Drift/month max. 2% of the measured value, or 0.1% by volume O2 Pressure influence of the measuring gas - 1.6 mV/100 mbar change Permissible fuels Gaseous hydrocarbons Natural gas L/H Fuel oil EL/S Coal Special fuels on request Permissible duration of exhaust gas temperature ≤ 500°C Dust concentration of fluegas Up to max. 5 gram/Nm3, furthermore baffle plate or separate protection pipe Speed of fluegas Up to max. 20 m/sec. or separate protection pipe Mounting position Down-grade downwards Supply of reference air via separate probe connection unit Supply of calibration gas via separate probe connection unit Service life ≥ 2 years, for fuel oil EL and natural gas Probe output voltage 0.01 to 12% by volume O2 150 ... 0 mV Probe internal resistance RI in air 20 °C and 13 V heating voltage ≤ 150 Ω Probe voltage in air 20 °C in new state and 13 V heating voltage - 5...- 15 mV Supply voltage measurement cell heating 11...16 VDC; polarity changes cyclically Heat output at 13 V in steady state condition approximately 16 watts Heating current at 13 V in steady state condition approximately 1.3 A Insulation resistance between heating and probe connection > 30 MΩ Suitable for EX area 1 II (2) G for the temperature monitoring II 2 G EEx d 11B + H2T3 (160°C) for the probe EX area 2 EEx d 11B + H2T3 (160°C)for the probe Class of protection IP65 Sampling direct in wastegas flue (InSitu) Material Probe /-parts flange Sinterfritte Test pressure of the sintered frite 26 bar (g) : 1.4571 : 1.4541 : 1.4404 CrNi-Steel Wiring Diagram for Lambda Transmitter LT2-Ex / LS2-Ex Lambda Transmitter LT 2 - EX LAMTEC SYSTEM BUS floating (+) * Module 4 (-) Analogue outputs 0/4...20 mA 0/2...10 V (option) (+) * Module 3 (-) (+) * Module 2 (-) * on processor printed circuit board (+) * Module 1 (-) Monitor output 0...2.55 V DC Switch-over between O2 , U-O2, Ri Analogue measurement inputs standard signals 0/4...20 mA 0...10 V temperature, pressure (+) (-) 75 74 73 72 71 CAN Low CAN high not con. not con. CAN GND 49 48 not be placed 47 46 not be placed 45 44 not be placed 43 42 0...10 Vol.% O2 --> 4...20mA 32 31 For example, for connection of a multimeter for service purposes Ri > 10 k Ω Measure ment card 4 26 25 24 23 not be placed Measure ment card 3 22 21 20 19 not be placed Relay output 1 0... 42 V DC, 3 A 0...230 V AC, 2 A F1 T1A / 250 V [230 V] T2A / 250 V [1 15 V] 3 2 1 For example, combined fault indication (configurable as required) Manufacturer's setting: quiescent current principle PE = Earth N L = Neutral conductor = Phase 230 / 115 V, 48...62 Hz Line power consumption typically 50 VA Short-term (probe heating phase) ca. 150 VA To be used only in grounded power line networks ! Wiring Diagram for Lambda Transmitter LT2-Ex / LS2-Ex Lambda-Transmitter LT2 Ex1 with temperature monitoring Digital inputs 24V, ca. 6mA Jumper JP106 and JP107 on LT2-mainboard Pos. 1-2 (default) non floating for int. voltage source Pos. 2-3 floating for ext. voltage source +24 V Input 8 Input 7 Input 6 Input 5 Input 4 Input 3 Input 2 Input 1 GND +24V 69 68 67 66 65 64 63 62 61 60 PCU Probe connection LS2-Ex from isolated switch ampl. 2m LS2-EX1 (-) 33 33 Probe signal - O2 blue 1 Probe signal - O2 (+) 34 34 Probe signal + O2 black 2 Probe signal + O2 Heater 35 35 Probe heater brown 3 Probe heater Heater 36 36 Probe heater white 6 Probe heater 7 PT100 red 7 PT100 10 PT100 pink 10 PT100 Ref.Air Cal.Gas Teflon hose Temperature monitoring build-in in LT 2Ex Relay output Supply DC 24V internal X2 4 3 21+ X1 4 3 Analogue output 20...2,5V -> 0...495°C 1+ Flowmeter Cal.gas 40...60l/h internal wired to probe heater internal wired to term.60/61 PT100 input Isolated switch ampifier NAMUR input Relay output 1+ 37 9 Supply AC230V internal 14 15 build-in in LT 2Ex hose connectors 4/6mm internal wired to term.16/17 Analogue imput 2 + - Flowmeter Reference air 50...60l/h with NAMUR internal wired to digital input 4 (term.65) Pressure air or testgas as calibration gas pre pressure 1bar Pressure air as reference ait pre pressure 1bar Wiring Diagram for Lambda Transmitter LT2-Ex / LS2-Ex Lambda-Transmitter LT2 Ex2 without temperature monitoring Digital inputs 24V, ca. 6mA Jumper JP106 and JP107 on LT2-mainboard Pos. 1-2 (default) non floating for int. voltage source Pos. 2-3 floating for ext. voltage source +24 V Input 8 Input 7 Input 6 Input 5 Input 4 Input 3 Input 2 Input 1 GND +24V 69 68 67 66 65 64 63 62 61 60 PCU Probe connection LS2-Ex (-) 33 33 Probe signal - O2 (+) 34 34 Probe signal + O2 Heater 35 35 Probe heater Heater 36 36 Probe heater from isolated switch ampl. 2m LS2-EX2 1 Probe signal + O2 2 Probe signal - O2 brown 3 Probe heater white 6 Probe heater blu bla Ref.Air Cal.Gas Teflon hose Flowmeter Cal.gas 40...60l/h + - Isolated switch ampifier NAMUR input Relay output 1+ 37 9 Supply AC230V internal 14 15 build-in in LT 2Ex Flowmeter Reference air 50...60l/h with NAMUR internal wired to digital input 4 (term.65) hose connectors 4/6mm Pressure air or testgas as calibration gas pre pressure 1bar Pressure air as reference ait pre pressure 1bar Wiring Diagram for Lambda Transmitter LT2-Ex / LS2-Ex Lambda Transmitter LT 2Ex Relay module 657 R 0857 terminal strip X2 18 16 17 Relay output 7 15 13 14 Relay output 6 d5 12 10 11 Relay output 5 d4 9 7 8 Relay output 4 d3 6 4 5 Relay output 3 d2 3 1 2 Relay output 2 d7 Relay outputs 2-7 Max. 230VAC/4A 48VDC/3A d6 Interface modules RS232 RS422 25pin connector for interface module only in connection with Remote Display Software - 657 R 1101 - 663 P 0500 Dimensions Lambda Probe LS2-Ex 8x M16x50 geriffelte Seite Counter flange glatte Seite Dimensions LT2 in Wall Mounting Housing Dimensions LT2 on Mounting Plate Dimensions LT2 in Panel Mounting Housing Dimensions PCU on Mounting Plate Dimensions Eex d Housing Nominal voltage: AC 690 V Protection code: IP65 • Basic material: Aluminium aloy, low copper contents • Cable glands: 6x EEx d M20 M8 x 17mm 235mm 360mm • Dimensions ootside: W380 x H560 x D245mm • Dimensions inside: W305 x H490 x D160mm • Weight: 27kg Item Numbers 657 R 102 / LS2 / Ex1 / a1 LT2 in wall mounting housing with temperature monitoring for connecting of the lambda probe LS2-Ex1, incl. display and operation unit 657 R 102 / LS2 / Ex2 / a1 LT2 in wall mounting housing without temperature monitoring for connecting of the lambda probe LS2-Ex2, incl. display and operation unit 657 R 103 / LS2 / Ex1 / a1 LT2 on a mounting plate with temperature monitoring for connecting of the lambda probe LS2-Ex1, incl. display and operation unit 657 R 103 / LS2 / Ex2 / a1 LT2 on a mounting plate without temperature monitoring for connecting of the lambda probe LS2-Ex2, incl. display and operation unit 657 R 104 / LS2 / Ex1 LT2 in panel mounting housing with temperature monitoring for connecting of the lambda probe LS2-Ex1, incl. display and operation unit 657 R 104 / LS2 / Ex2 LT2 in panel mounting housing without temperature monitoring for connecting of the lambda probe LS2-Ex2, incl. display and operation unit 657 R 0165 Eex d housing for Ex-area 1 and 2 for using of the LT2 on a mounting plate inside of the EX-area 650 R 4000 Lambda probe LS2-Ex1 with calibration gas connector, for semi-automatically calibration and PT100measurment element Installation depth: 500mm 650 R 4005 Lambda probe LS2-Ex1 with calibration gas connector, for semi-automatically calibration and PT100measurment element Installation depth: 860mm 650 R 4010 Lambda probe LS2-Ex2 with calibration gas connector, for semi-automatically calibration Installation depth: 500mm 650 R 4015 Lambda probe LS2-Ex2 with calibration gas connector, for semi-automatically calibration Installation depth: 860mm 650 P 4025 Probe connection unit on a mounting plate, for connecting of the lambda probe LS2-Ex2 650 P 4026 Probe connection unit on a mounting plate, for connecting of the lambda probe LS2-Ex1 657 R 1070 Wall mounting housing IP65, for probe connection units on a mounting plate 650 R 4050 Counter flange DN80 PN40 650 R 4052 Seal for counter flange Item Numbers 657 R 1101 Remote-Display-Software invl. Interface module RS 232 for PC 657 R 1102 Further licences for Remote-Display-Software 663 R 9002 Interface module RS 422 / 485 instead of RS232 657 R 0890 Analog input Measurement card for temperature input PT-100 e.g. for measuring the flue gas temperature 657 R 0891 Temperature sensor PT 100, length 250 mm 657 R 6000 Analog input Measurement card for Potentiometer 1...5 kΩ 657 R 6001 Analog input Measurement card for 0/4...20 mA 663 R 6002 Analog input Measurement card for 0/4...20 mA with supply voltage 24 V DC for transducer 663 R 6005 Analog input Measurement card for 0/2...10 V 657 R 0050 Analog output Plug-in card for 0/4...20 mA, 0...10 V 657 R 0051 Analog output Plug-in card for 0/4...20 mA, 0...10 V, floating, max. floating difference ± 20 V (only output 1 and 2) 657 R 0857 Digital outputs Relay module with 6 relays 657 R 0920 Load-dependent and fuel-specific limit values/limit curves 657 R 0910 Calculation and display of the concentration of CO2 Item Numbers 657 R 0895 Measurement of flue gas and intake air temperature, and calculation of the efficiency of combustion 657 R 1120 Integrated PID-O2 controller 657 R 1124 Output of the internal load via analog output 2 (only in conjunction with ETAMATIC/FMS/VMS) 663 R 040 / 1 / LT Field Bus connection in variant Profibus DP for LT 663 R 040 / 3 / LT Field Bus connection in variant Modbus for LT 663 R 040 / 6 / LT Field Bus connection in variant Ethernet for LT LAMTEC Meß- und Regeltechnik für Feuerungen GmbH & Co KG LAMTEC Leipzig GmbH & Co KG Wiesenstraße 6 D-69190 Walldorf Telefon (+49) 06227 / 6052-0 Telefax (+49) 06227 / 6052-57 Internet: www.lamtec.de e-mail: info@lamtec.de Schlesierstraße 55 D-04299 Leipzig Telefon (+49) 0341 / 863294-00 Telefax (+49) 0341 / 863294-10 Überreicht durch: Druckschrift-Nr.: D LT 3005-11-aE - 0031 Printed in Germany