User Manual CO2-Sensor 10% / 30% / 100% Release 1.23
Contents
1. 2 O R54 5 c71 y I5 E N ON 5 Jo Serial Interface 148mm User Manual CO2 LC V1 6e doc 8 16 Vcc GND 4 20 GND 0 4 JP1 42 R44 SPAN R83 4mA Adjust R87 20mA Adjust D91 D51 D52 D53 R70 V Out Adjust MU Type Description of Function Terminal clamp Voltage supply 8 12V DC Terminal clamp Ground connector for electrical supply F Terminal clamp Current Loop output positive Signal Terminal clamp Ground connector interface current voltage negative Signal Voltage outlet positive Signal optionally Pin header force output to 4 mA on current loop interface Jumper 4mA center adjustment with R83 e force output to 20 mA on current loop interface Jumper 20mA center adjustment with R87 e current loop interface provides current proportional actual gas concentration e g put Jumper on X10 factory preset Potentiometer Calibration 0 CO adjustment Potentiometer Calibration full scale value e g 100 r Potentiometer Calibration of current interface of 4mA see also JP1 Potentiometer Calibration of current interface of 20mA see also JP1 SS Electrical supply o k Disturbed measurement values e g by strong air draft or considerable change of temperature Exceeding of maximum value i e gt 10 30 100 Undershooting2. The circuit needs to stabilize after changes of settings therefore please observe the value for approx 20 seconds User Manual CO2 LC V1 6e doc Page 16 16
3. User Manual 10 30 100 Release 1 23 List of Releases ee eee Awas __________ 1 0 1542 1997 S Otto 01 06 1998 S Otto Minor modifications 01 10 1998 S Otto Revision of calibration 07 02 2001 S Otto New layout change of address 13 02 2001 S Otto Transfer characteristic 21 08 2001 S Otto Adaptation to new software V1 23 11 07 2005 K Techritz 1 English Version minor modifications Address m u t GmbH Am Marienhof 2 D 22880 Wedel GERMANY Telephone 49 0 4103 9308 0 Fax 49 0 4103 9308 99 Internet http www mut gmbh de eMail info mut gmbh de Datenmedia User Manual CO2 LC V1 6e doc Contents uu 5 2 uuu u xu uuu us uuu 6 2 1 ELECTRICAL CONNECTIONS llu 6 2 2 GAS CONNECTIONS ennenen 7 3 CONNECTION S u 8 3 1 OVERVIEW u uu u u uu _________6 64______________6___4__ _ _ 8 3 2 TRANSFER CHARACTERISTICS 10 4 ADJUSTMENT OF SIGNAL 11 4 1 CURRENT OUTPUT Z u u u uuu unun uuu 11 4 2 h o i y Yc1 K oU g E 11 5 CALIBRATION Arn E
4. A 12 5 1 12 5 2 SETTING OF 2 13 5 3 SETTING OF CONCENTRATION uu u nusdcdseatunecusnnnsdawsuswescwsieubieicurerardsurssavunexenecaiernes 14 5 3 1 I DI G IU ee ene ee en ee ea PEAR neem ee ean eel eer 14 5 3 2 Pressure correction 10ccceccccacecconsccccecconscectacersonssectacersanessanacersaneanscensacersansseatacersonnssanacerenss 15 5 99 G uuu u uu NEEE 16 User Manual 2 V1 6e doc 1 Technical Data Input voltage Vcc Input current lcc Cutout Value Signal current loop interface Signal voltage interface Display Accuracy Temperature range Compensation of temperature Gas Connections Inner Diameter 3mm Outer Diameter 5mm Nylon PVC Neoprene no Silicone hose Gas flow lt 1 Litre minute 0 35 Litre minute recommended Maximum Overpressure 0 5bar measurement at normal pressure Measurement interval approx 1s every 23s correction cycles for 75 Step response too approx 10s 350ml min depending on flow through Di
5. of minimum value i e lt 0 L j Potentiometer Adjustment of voltage output optionally User Manual CO2 LC V1 6e doc 9 16 3 2 Transfer characteristics The outlet current 4 20mA measured at terminal clamps 4 20 and is directly proportional to the measured concentration of gas Current Relative Gas Example Example concentration 30 CO Sensor 100 CO Sensor 0 0 50 of maximum value 15 50 100 of maximum value 30 100 The maximum value may be abbreviated with FS Full Scale Transfer Function 100 x r F F F EZ E 6 p Scanner pee Se 0 2 4 6 8 10 12 14 16 18 20 2 Rel Gas Concentration 25 x Current Loop Interface mA User Manual CO2 LC V1 6e doc Page 10 16 4 Adjustment of signal outputs 4 1 Current output The 4 20mA current interface must be calibrated in following order 1 Connect a current measuring instrument ampere meter or a current sink to the terminal clamp 4 20mA X4 GND 2 4mA Adjustment The jumper must be fitted on the pin header JP7 connecting the inner and the outer pin Then adjust R83 4mA Adjust until the measuring instrument shows 4 00 mA 20mA Adjustment The jumper must be position on the p
6. in header JP7 connecting the inner and the outer pin 20 Then adjust R87 20mA Adjust until the measuring instrument shows 20 0mA 4 Measuring position The jumper must be connected to the pin header X70 presetting by factory The current outlet now supplies the current proportionally to the measured gas concentration exceeding undershooting of approx 0 1mA is overflow resp underflow range 4 2 Voltage outlet The adjustment of the voltage signal is done the R70 V Out Adjust The voltage outlet 0 4V can be adjusted for an indicating device plotting unit e g built in digital voltmeter The voltage outlet may only be loaded high resistive User Manual CO2 LC V1 6e doc Page 11 16 lt m u t 5 Calibration 5 1 Remarks Kindly proceed the calibration following the following two chapters by all means Calibration tests like changing of the length of the cuvette adjustment of the detector or adjustments of potentiometers that are not designated for purpose require a new calibration in our factory A calibration must be proceeded in following order 1 Calibration test of the current interface on 4 00mA 2 Calibration test of the current interface on 20 0mA 3 Calibration test of the sensor on 0 gas 4 Calibration test of the sensor on full scale gas concentration User Manual CO2 LC V1 6e doc 12 16 5 2 Setting of zero point Also for calibration please bear in mind da
7. mensions 100x160 mm max construction height 50mm Weight approx 200g e Signal voltage interface e Serial interfaces RS232 RS422 RS485 User Manual CO2 LC V1 6e doc 5 16 lt m u t 2 Implementation 2 1 Electrical Connections Kindly bear in mind to discharge possible electrostatic charges of your body at appropriate grounded devices e g heater grounded housing All electrical connections must be established before switching on the electrical supply Avoid any mechanical forces of the cuvette little aluminum block on the circuit board Touch the circuit board at its edges only Connect the ground strap of the electrical supply with the connector GND see also chapter Connections and the anode with the connector Vcc The used power supply must comply with the specifications referred to in the Technical Data Connect the ground of the signal separate terminal clamp but connected with supply ground with the ground of the device to be fed Voltage fed plotting units e g displays must be connected with output 0 5V current fed devices with output 4 20mA We recommend the connection with a shielded cable with a twisted pair STP grounded from both sides The CO sensor is delivered calibrated with the values 4 and 20mA for the current interface and with concentration values of 0 and full scale 10 30 100 User Manual CO2 LC V1 6e doc Page 6 16 2 2 Gas Connections Loosen the knu
8. ossible to proceed the calibration after setting of zero point with a gas of any concentration However the calibration is the more accurate the higher the concentration of the second calibration gas Therefore we recommend a calibration with 100 for the 100 version respectively 30 ideally in N2 fort the 30 version Generally the desired current value is calculated as follows desired value for the calibration Symbol Dimension Description required output current at concentration Cee Conccc concentration of calibration gas e g 30 CO2 CO full scale concentration of gas sensor e g 100 CO Example Conccc 30 lrequired User Manual CO2 LC V1 6e doc Page 14 16 5 3 2 Pressure correction needs to be considered that generally the declaration of the concentration of the calibration gas is based on normal pressure 1013 25 mbar and standard temperature 298 K Due to the integrated temperature compensation the difference in pressure needs to be calculated The gas temperature should be identical with the environment temperature In case the calibration is done under circumstances different to the standard circumstances the value shown by the sensor card needs to be calculated newly with following formula to calculate the needed concentration of the calibration gas Symbol Dimension Description Concpy CO2 Displayed ga
9. rled nut of the hose connections on the top of the cuvette Counter turn the cuvette at the same time with the other hand Connect the knurled nut to the hoses Push the hoses as far as possible on the connector and tighten the nuts hand screwed counter turned again The connections for in and output are arbitrary The temperature of the gas should be identically to the ambient air temperature of the gas sensor The environment of the sensor card should not be polluted with high concentrations Avoid forces and momenta on the cuvette while loosening and tightening of the connecting nut hold and counter turn the cuvette with the other hand Provide the input with a filter to avoid soiling of the cuvette The maximum pressure may not be exceeded see Technical Data During measurements the gas must discharge freely Blockages of the gas outlet will lead to errors in measurement due to pressure increase Increased flow rates will lead to errors in measurement amongst others due to pressure increase see Technical Data User Manual CO2 LC V1 6e doc 7116 3 Connections 3 1 Overview 14 ead 50 Ok use R288 R201 R150 s s 128 TP22 TP12 gt G D ud JE Ucc 524 ______ Full Scale Gas O N 2 R41 43 5 2 Reset R81 2 IR Gassensor
10. s concentration concentration of calibration gas e g 30 CO2 P mbar pressure of gas inside cuvette i e typically ambient pressure Example Conccc If you calibrate your sensor with a premixed gas of 30 with the gas exhausted to Concpy ambient pressure of 1000mbar the displayed gas concentration shall be 29 6 instead of 30 With a gas sensor of 30 full scale this means one obtains an output current of 19 8mA instead of 20 0mA User Manual CO2 LC V1 6e doc Page 15 16 5 3 3 Calibration The sensor board must be taken into operation hour prior calibration Also for the calibration please bear in mind the data conc maximum pressure and maximum gas flow mentioned in the Technical Data Rinse the cuvette thoroughly with the calibration gas and either adjust the gas flow to minimum or interrupt the flow before setting the calibration values The gas flowing out of the gas container cools down considerably during its expansion and therefore adulterates the measured value The current outlet shall now generate a current flow towards GND that conforms with the desired value calculated in the last two chapters Adjust the desired value the potentiometer R44 SPAN If the desired value is 20mA you should do the adjustment from a lower value as 20mA represents the possible maximum current value A higher adjustment would lead to wrong calibration
11. ta conc maximum pressure and maximum gas flow mentioned in the Technical Data Before proceeding a gas calibration either the voltage or the current interface should be calibrated Prior to a calibration should be operated for at least 30 minutes in stable room temperature For the zero point setting you should ideally use a 100 nitrogen gas e g purity better 3 5 i e better 99 95 Rinse the cuvette thoroughly with the calibration gas and either adjust the gas flow to minimum or interrupt the flow before setting the calibration values The gas flowing out of the gas container cools down considerably during its expansion and therefore adulterates the measured value The current outlet 4 20 shall now generate a current flow from 4mA towards GND Please make sure that a resistive load internal resistance typ 100Ohm is connected between the current outlet and the ground connector GND Adjust the Potentiometers R42 ZERO to a current flow of gt 4mA Then reduce the current slowly to 4mA Stop the procedure when reaching the value and the yellow LED D53 LO is lid Further adjustments change the calibration parameters without visible changes of current The circuit needs to stabilize after changes of settings therefore please observe the value for approx 20 seconds User Manual CO2 LC V1 6e doc Page 13 16 5 3 Setting of concentration 5 3 1 Calibration gas In principle it is p
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