Summary of Contents for Edinburgh Sensors GasCheck
- Page 1 GasCheck Operating Manual V2.4 GASCHECK CARBON DIOXIDE SENSOR Operating Manual Edinburgh Instruments Limited 2 Bain Square, Kirkton Campus Livingston EH54 7DQ 44 (0)1506-425300 Fax 44 (0)1506-425320...
- Page 3 Edinburgh Instruments Limited, 2006 All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior permission of the copyright holder. The product described in this manual is subject to continuous development and, while every effort has been taken to ensure that the information given is correct, Edinburgh Instruments Limited cannot accept any liabilities for errors and omissions or their consequences.
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Page 5: Table Of Contents
Operating Manual V2.4 Contents INTRODUCTION ......................2 PRINCIPLE OF OPERATION ..................2 INSTALLATION ......................3 3.1 A Mechanical installation - Basic GasCheck ............ 3 Aspiration ....................... 4 3.2.1 Pumped aspiration ................4 Electrical connection for GasCheck .............. 5 Power supply requirements for GasCheck ........... 7 USING THE OUTPUT.................... -
Page 6: Introduction
The result is a device with both low initial cost and low cost of ownership. The GasCheck range is designed to meet the needs of OEMs who require to monitor CO , but do not themselves have expertise in the specialist field of infrared technology. -
Page 7: Principle Of Operation
The GasCheck sensor optics consists of an infrared source, a sampling cell, an infrared filter and a detector. In addition, the sensor includes electronics to drive the source and to process the signals from the detector. -
Page 8: Installation
15.7 2.54 between pins Figure 3.1 Dimensions (mm) of the GasCheck 3000ppm 15.7 2.54 between pins Figure 3.2 Dimensions (mm) for the GasCheck 3% and 10%... -
Page 9: Aspiration
Operating Manual V2.4 3.1 B Mechanical Installation - GasCheck with linearisation Board Four mounting holes suitable for M4 screws are provided on a 45 x 140mm grid. If spacers are used, these should be a least 6mm high to provide adequate clearance for the surface-mount components on the underside of the PCB. -
Page 10: Electrical Connection For Gascheck
It is not advisable to connect the outlet to other sensors or components, which might restrict the flow. Electrical connection for GasCheck The sensor head requires only a +15 V supply (connected to both the source... - Page 11 Output resistance = 1 k + 1% (50 ppm /C temperature coefficient) Electrical Connection - for GasCheck with linearisation board Electrical connection is normally made at terminal block TB1 on the sensor.
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Page 12: Power Supply Requirements For Gascheck
DC signal from sensor head 0 to 2V linear output Power supply requirements for GasCheck The sensor should be connected to a regulated, clean 15 V power supply. The sensor is insensitive to the actual power supply volts and will achieve specification for steady supply volts in the range 14.2 V to 15.8 V. - Page 13 Electrical Connections for the GasCheck with self-referencing The GasCheck with self-referencing requires a regulated 15V DC supply which must be connected to the terminals labeled 15V (+ve) and 0V (-ve) on PL1.(PL1-1 and PL1-2)
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Page 14: Using The Output
- 3. Note that the transmitter must always be separately calibrated at zero and span despite this linearisation. 4.1 B Output options for the GasCheck with linearisation The sensor is supplied configured for a 4-20mA current output with a fault state being indicated by 0mA. - Page 15 GasCheck Operating Manual V2.4 If you require a voltage output that is different to the ones listed in TABLE 1, then you can calculate the required resistor values using Ohm’s Law. i.e. for 0-10 V output select 0-20 mA ...
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Page 16: Temperature And Pressure Correction
1013 (mBar) For example: if a GasCheck 3000ppm sensor output is 0.978 V, then the linearisation data (Appendix1) states that the reading is 2852ppm. If the ambient pressure is 980 mbar then the true reading can be derived: 1013... -
Page 17: Service And Maintenance
Edinburgh Instruments products are inherently stable and will maintain their calibration over extended periods with minimal maintenance. We recommend that the calibration of the GasCheck is checked at least once a year. Any adjustments should be small. ZERO (nitrogen) and SPAN calibration gases must be applied to the sensor in order to check its calibration. - Page 18 (see next page). NOTE For the diffusion version of the GasCheck with self- referencing, in step 4 remove the rubber cup from the calibration port and then attach zero gas. Remember to refit the rubber cap to the calibration port at the end of the procedure.
- Page 19 (hPa or mbar) 1013.25 (mbar) EXAMPLE: If the GasCheck 3000 is to be calibrated with 3000 ppm gas on a day when the ambient pressure is 980 hPa, using equation (2) the output reading should be adjusted to read an equivalent to ...
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Page 20: Trouble Shooting
The infrared source comprises a tungsten filament lamp. The lamp has been specially designed and treated to give stable output in the infrared over an extended period. In case of a source failure, the GasCheck must be returned to Edinburgh Instruments for repair. -
Page 21: Technical Data
GasCheck Operating Manual V2.4 TECHNICAL DATA Measurement range: GasCheck 3000 0 to 3000 ppm CO GasCheck 3% 0 to 3% CO GasCheck 10% 0 to 10% CO Accuracy: at zero at full scale 30 ppm CO 90 ppm CO GasCheck 3000 0.03 % CO... - Page 22 Operating Manual V2.4 -20 to +60 C Storage temperature: Operating humidity range: 0 to 100 %RH (non-condensing) Electromagnetic compatibility The GasCheck sensors have successfully passed the following tests: RF field emission EN 55022 RF field susceptibility IEC 1000-4-3 Although the sensors have passed these tests, they cannot be provided with the CE label due to the fact that they are OEM products, which are designed to be integrated by the user.
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Page 23: Warranty
GasCheck Operating Manual V2.4 WARRANTY Edinburgh Instruments Ltd. guarantees the equipment against defective materials or workmanship for a period of one year from the date of the delivery. In no event shall the Company be liable for any consequential loss or damage arising from failure of the equipment under warranty. -
Page 24: Document History Change
GasCheck Operating Manual V2.4 DOCUMENT HISTORY CHANGE VERSION DATE ORIGINAL 24/02/2000 6276 20/09/2000 6310 14/02/2001 6585 01/11/2004 6675 20/02/2006 7017 04/04/2011... - Page 25 GasCheck Operating Manual V2.4 APPENDIX 1 Gascheck Linearisation Curve 0.3% Head 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 Gas Concentration (%CO2) APPENDIX 2 Gascheck Linearisation Curve 3% Head Gas Concentration (%CO2)
- Page 26 GasCheck Operating Manual V2.4 APPENDIX 3 GasCheck Linearisation Curve 10% Output (Volts) CO2 Concentration (%)
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