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Summary of Contents for ANALOX 2000 Series
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Page 1: User Manual
ANALOX 2000 Series - Flammable Gas Sensors User Manual Analox Sensor Technology Ltd 15 Ellerbeck Court, Stokesley Business Park North Yorkshire, TS9 5PT T: +44 (0)1642 711400 F: +44 (0)1642 713900 W: www.analox.net E: info@analox.net... -
Page 2: Table Of Contents
Analox 2000 – Flammable Gas Sensors – User Manual CONTENTS I ntroduction ............................3 Principle of Operation ......................4 L.E.L. and U.E.L........................5 Sensor Signal Cables ......................6 Instrument Calibration ......................7 Sensor Physical Details......................8 Electrical Connections ......................9 Flammable Sensor Wiring Variations .................. -
Page 3: Introduction
FLAMMABLE GAS SENSORS INTRODUCTION The ANALOX 2000 Range of sensors are designed to detect Flammable gas, mainly Methane (CH4) in ambient air monitoring applications. There are two models in the range: Model 2000 which is of the Explosion proof type and Model 2001 which is a lower cost, uncertified type, suitable for use in areas which are not classified as being hazardous. -
Page 4: Principle Of Operation
Analox 2000 – Flammable Gas Sensors – User Manual PRINCIPLE OF OPERATION Both sensors use the same devices to actually detect the presence of a flammable gas in the air surrounding the sensing surface. The elements used in these sensors are of the Catalytic Pellistor type and are sensitive to most common Combustible gases and vapors. -
Page 5: L.e.l. And U.e.l
Analox 2000 – Flammable Gas Sensors – User Manual L.E.L. and U.E.L. The above principle of operation is only valid where the gas mixture to be sensed contains Oxygen. It is therefore suitable for detection of leakage’s of gasest in atmospheric surroundings, where it is important to know the level of concentration, well before a hazardous situation arises. -
Page 6: Sensor Signal Cables
NOTE: Although the ANALOX 2000 & 2001 sensors use a 3 wire connecting cable, only two of the wires carry the sensor excitation current. The third wire is connected to the centre tap of the 'Half Bridge' configuration. -
Page 7: Instrument Calibration
Analox 2000 – Flammable Gas Sensors – User Manual INSTRUMENT CALIBRATION There is some confusion over what is meant by the Sensitivity of instruments used to measure the concentrations of combustible gas. Ideally, all units employing catalytic combustion as the measuring principle should be calibrated in terms of percentage of potential combustibility, where 100% scale reading represents an ignitable mixture, for a particular Gas/Air mixture. -
Page 8: Sensor Physical Details
Analox 2000 – Flammable Gas Sensors – User Manual SENSOR PHYSICAL DETAILS Document Ref: SK0-810-04 January 2009 Page 8... -
Page 9: Electrical Connections
Analox 2000 – Flammable Gas Sensors – User Manual ELECTRICAL CONNECTIONS ANALOX 2000 SENSOR ANALOX 2001 SENSOR Document Ref: SK0-810-04 January 2009 Page 9... -
Page 10: Flammable Sensor Wiring Variations
Sensors a. and b. are normally supplied fitted to an EExe Cast Iron Junction Box and together, form the ANALOX 2000 Flammable gas sensor unit, suitable for use in Hazardous areas. Sensor c. , the ANALOX 2001, is a less expensive alternative which can be used in areas which are not classified as Hazardous. -
Page 11: Accessories
Calibration adaptors and collecting cones are available for both types of sensor. Identification and part Numbers are listed below. Calibration adaptor for ANALOX 2000 when used WITHOUT Collecting cone : SA2 SO2 FLOW Calibration adaptor for ANALOX 2000 when used WITH Collecting cone : SA2 FLOW1... - Page 12 Analox 2000 – Flammable Gas Sensors – User Manual Further details may be obtained from AST. Ltd., whose address, telephone and fax numbers are on the front page of this manual. Document Ref: SK0-810-04 January 2009 Page 12...
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Page 13: Certification
Analox 2000 – Flammable Gas Sensors – User Manual CERTIFICATION Areas into which gas sensors may be installed, may be classified as being potentially or actually hazardous, in accordance with applicable legislation, or alternatively may be unclassified. Hazardous areas are split into zones as defined in BS 5345 and IEC79-10, as... -
Page 14: Intrisically Safe System
Analox 2000 – Flammable Gas Sensors – User Manual INTRINSICALLY SAFE SYSTEM The ANALOX 2000 sensor may be used as a component within an Intrinsically Safe SYSTEM where the area to be monitored is classed as Zone 0 and therefore requires that any electrical equipment system used therein be classified Ex ia. -
Page 15: Chemical Poisoning
Analox 2000 – Flammable Gas Sensors – User Manual 2000 Sensor with VQ22 Pellistors. Gas Group Maximum cable length 25.39 mtr. 76.14 mtr. 253.86 mtr. SENSOR RESPONSE TIME The time taken for the monitoring instrument to indicate the concentration of gas at the sensor is dependent on two factors. - Page 16 Analox 2000 – Flammable Gas Sensors – User Manual This is an extremely complex problem on which, a considerable amount of research is currently being carried out. It is well known that some substances can cause a significant reduction on overall sensitivity of the system and in some cases, the effects are only temporary, in others a permanent degradation in response can take place.
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Page 17: Appendix
Analox 2000 – Flammable Gas Sensors – User Manual APPENDIX TO ANALOX 2000 SERIES MANUAL A feature of the Pellistor Combustible gas detectors is the almost universal response to LEL of hydrocarbons. Almost all detectable gases produce a similar output at LEL. This table lists the theoretical factors by which the signal with a Calibration gas should be multiplied to give the equivalent signal for other gases. -
Page 18: Cable Requirements
Analox 2000 – Flammable Gas Sensors – User Manual FLAMMABLE SENSOR CABLE REQUIREMENTS When using the present ANALOX 2000 or 2001 Flammable sensors with the Analox 1300/1320 instruments, the following data gives guidance to the maximum permissible cable lengths, for wire having various cross sectional areas. - Page 19 Analox 2000 – Flammable Gas Sensors – User Manual Using: 1 0mm2 Cable with resistance 19.1 Ohms/Km (38.2 Ohms/loop) VQ21 max. distance = 6 = .157Km or 157mtr 38.2 VQ22 max. distance = 10.28 = .269Km or 269mtr 38.2 VQ23 max.
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Page 20: Disposal
Analox 2000 – Flammable Gas Sensors – User Manual DISPOSAL According to WEEE regulation this electronic product can not be placed in household waste bins. Please check local regulations for information on the disposal of electronic products in your area.
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