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NDIR LEL gas detection

NDIR LEL gas detection

Structure of Ndir Gas SensorOperating PrincipleFeaturesWhen infrared radiation interacts with gas molecules, infrared light is absorbed by the gas molecules at a particular wavelength, causing vibration of the gas molecules. NDIR (Non-Dispersive Infrared) gas sensors detect decrease in transmitted infrared light which is in proportion to gas concentration. This transmittance, the ratio of transmitted radiation energy to the incident energy, is dependent on target gas concentration. NDIR gas sensor consist of an infrared source, detector, optical filter, gas cell, and electr…See more on figaro.co.jpEnmet Gas Detectors Page 4 - Western Safety Products Inc. based detection can be reliable as low as a few hun­dred PPM of CO2 and through the LEL range of most hydrocarbons. When an NDIR sensor-based instru­ment is used for gas evaluation for methane it is imperative that the users understand the lack of response to such gases as hydrogen and acetylene.

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