Alberta Boilers Safety Association (ABSA) Practice Test

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Which gas is primarily measured by NDIR detectors?

The correct answer is: CO

NDIR (Non-Dispersive Infrared) detectors are specifically designed to measure gases that absorb infrared radiation. Among the gases listed, carbon monoxide (CO) is significantly measured using NDIR techniques because it has strong molecular absorption characteristics in the infrared spectrum. This allows NDIR sensors to function well in detecting changes in CO concentration reliably and accurately, as they can differentiate between CO and other gases in the environment by evaluating the specific wavelengths of infrared light absorbed by the gas molecules. Carbon dioxide (CO2), methane (CH4), and sulfur dioxide (SO2) can also be measured using different forms of infrared detection but CO is most commonly associated with NDIR due to its relevance in combustion processes and its importance in environmental monitoring.