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Edinburgh Sensors GasCheck Скачать руководство пользователя страница 3

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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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Содержание GasCheck

Страница 1: ...GasCheck Operating Manual V2 4 GASCHECK CARBON DIOXIDE SENSOR Operating Manual Edinburgh Instruments Limited 2 Bain Square Kirkton Campus Livingston EH54 7DQ UK 44 0 1506 425300 Fax 44 0 1506 425320 ...

Страница 2: ......

Страница 3: ... 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 ...

Страница 4: ......

Страница 5: ...1 Pumped aspiration 4 3 3 Electrical connection for GasCheck 5 3 5 Power supply requirements for GasCheck 7 4 USING THE OUTPUT 9 4 1 A Linearisation of the GasCheck 9 4 2 Temperature and Pressure correction 11 5 SERVICE AND MAINTENANCE 12 5 1 Calibration 12 5 2 Trouble shooting 15 5 3 Source replacement 15 6 TECHNICAL DATA 16 7 WARRANTY 18 8 DOCUMENT HISTORY CHANGE 19 ...

Страница 6: ...list field of infrared technology The sensors comprise the heart of an infrared detection system offering the user a conditioned 0 1 V output for ease of installation Surface mount electronics technology enables the GasCheck range to provide a complete infrared sensor sub system in a compact format The main features of the GasCheck sensor are high accuracy good long term stability low temperature ...

Страница 7: ...ensor includes electronics to drive the source and to process the signals from the detector source drive electronics sample cell IR source detector signal processing electronics Figure 2 1 Schematic of the GasCheck sensor The infrared source is the hot filament of a tungsten lamp emitting a broad band of radiation which is then guided through the gas in the sample cell The infrared then passes thr...

Страница 8: ... the PCB for electrical connection 1 9 mm pads with 1 0 mm holes recommended and the pins on the sensor should be soldered directly to these pads In designing the PCB to accept the sensor consideration should be given to the inlet and outlet pipes to ensure that these do not collide with tall components 140 4 113 7 5 7 5 130 31 5 38 0 8 2 54 between pins 51 15 7 Figure 3 1 Dimensions mm of the Gas...

Страница 9: ... time consideration should be given to the dead volume within the complete system comprising both the sensor head and the pipework The dead volumes for the various sensor heads are Range Dead volume 3000 ppm 9 cm3 3 4 cm3 10 4 cm3 Connection to the sensor is via the barbed gas ports on the side of the head These are suitable for N3 3 mm bore soft flexible tubing Neoprene and PVC tubing is suitable...

Страница 10: ... this does not create a back pressure in the cell which would lead to erroneous readings see Section 4 2 The outlet should be free venting via tubing which is neither too narrow nor too long It is not advisable to connect the outlet to other sensors or components which might restrict the flow 3 3 Electrical connection for GasCheck The sensor head requires only a 15 V supply connected to both the s...

Страница 11: ...pedance circuits such as inverting op amp based amplifiers If connected to a low impedance circuit the output resistance should be included in any gain calculations Output resistance 1 k 1 50 ppm C temperature coefficient 3 4 Electrical Connection for GasCheck with linearisation board Electrical connection is normally made at terminal block TB1 on the sensor The nominal 24V DC supply should be con...

Страница 12: ...ification for steady supply volts in the range 14 2 V to 15 8 V The load current taken by the sensor is not constant and contains significant components at 8 Hz 1 kHz and their harmonics The peak current required during normal operation is 300 mA although the average current to be used for power dissipation calculations is only 60 mA The power supply should be capable of supplying this load whilst...

Страница 13: ...ge current to be used for power dissipation calculations is only 100mA The inrush current at power up is 1 2A the power supply should be capable of supplying this although the supply voltage need not be maintained during this time 3 7 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 te...

Страница 14: ...utput 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 Alternative current voltage outputs are available by changing links on the board and fitting a resistor voltage outputs only To change the output from 4 20mA to 0 20mA the link on LK1 should be removed and fitted to LK2 To disable the function wh...

Страница 15: ... 1 then you can calculate the required resistor values using Ohm s Law R V I i e for 0 10 V output select 0 20 mA R V I 10 20 10 500 3 500 37 36 37 36 R R R R k R R 1 37 36 500 resistance is obtained by fitting 1K resistors to R36 and R37 The maximum available output voltage is limited to 12 volts approximately ...

Страница 16: ...the same cylinder will vary from day to day depending on the ambient conditions The sensor has built in compensation for temperature variation Pressure correction can be calculated from the ideal gas law but there is also an increase in absorption per molecule with pressure due to line broadening effects The sum of theses two effects is that the True V V is related to the displayed value from the ...

Страница 17: ...ained the CO2 concentration of the SPAN gas should be between 80 and 105 of the full scale the tolerance of the CO2 volume concentration of the gas bottle should be 2 or better the output pressure from the regulator should only slightly exceed the ambient pressure CAUTION Never connect cylinders or other pressure sources directly to the sensor as the high pressure in the cylinder may damage the se...

Страница 18: ...PAN gas Adjustment is achieved using the SPAN potentiometer on the detector printed circuit board For maximum accuracy the bottle concentration should be corrected for pressure 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 ...

Страница 19: ...e sensor fundamentally measures mole density and not volume percent see Chapter 3 2 it is advisable to calculate the targeted instrument reading corresponding to the span gas concentration with the ambient pressure taken into account in order to achieve maximum accuracy from the GasCheck sensor The targeted concentration reading is given by equation Po Po P BC TCR 5 0 5 1 2 where TCR targeted conc...

Страница 20: ...isible through source PCB if not see below check that S O T Select On Test resistor R5 on detector PCB is fitted properly check PL1 5 on detector PCB for the presence of a rectified sinewave source not flashing check power to source PCB depower sensor and measure source resistance which should be 7 if reads open circuit the source has failed see Section 5 3 check oscillator running on source PCB I...

Страница 21: ...t zero 0 5 of full scale at full scale 1 5 of full scale Stability over one year GasCheck 3000 150 ppm CO2 year GasCheck 3 0 15 CO2 year GasCheck 10 0 5 CO2 year 5 of full scale General Response time T90 20 s with pump 10 to 90 response 50 s with diffusion aspiration Zero drift with time 2 of full scale year with temperature 0 1 of full scale C Sensing technique single beam NDIR Analogue outputs n...

Страница 22: ...ity 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 The product described in this manual is subject to continuous development and while every effort has been taken to make sure that the information given is correct Edinburgh Instruments Limited cannot accep...

Страница 23: ... Purchaser That the equipment will be operated in accordance with the instructions and advice detailed in the appropriate operating instruction manual or any other instructions which may be provided by Edinburgh Instruments Ltd Edinburgh Instruments Ltd shall not be held responsible for any defect arising from the Purchaser s failure to comply with these recommendations and instructions or from da...

Страница 24: ...GasCheck Operating Manual V2 4 19 8 DOCUMENT HISTORY CHANGE VERSION ECN DATE 1 0 ORIGINAL 24 02 2000 2 0 6276 20 09 2000 2 1 6310 14 02 2001 2 2 6585 01 11 2004 2 3 6675 20 02 2006 2 4 7017 04 04 2011 ...

Страница 25: ... 7 0 8 0 9 1 1 1 1 2 1 3 1 4 1 5 0 00 0 05 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 Gas Concentration CO2 o u t p u t v o l t s APPENDIX 2 Gascheck Linearisation Curve 3 Head 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 1 1 1 2 1 3 1 4 1 5 0 0 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 Gas Concentration CO2 Ou tp ut Vo lts ...

Страница 26: ...sCheck Operating Manual V2 4 21 APPENDIX 3 GasCheck Linearisation Curve 10 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 CO2 Concentration Output Volts ...

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