Non-dispersive Infrared (NDIR) spectroscopy is a widely used technique for measuring the concentration of specific gases, including carbon monoxide, in a gas mixture. CO absorbs infrared radiation at specific wavelengths, and NDIR instruments are designed with a fixed wavelength filter or gas filter cell to measure the absorption at the characteristic wavelength of CO, providing a sensitive and selective measurement even at low ppm levels.
CO level in the exhaust gas upto 10 ppm can be monitored by
Asked in WBCS Main Paper 4 2022 · Topic: Physical and Chemical Changes, Solution (Methods of Expressing Concentration of Solutions (Mass Percentage, Volume Percentage, Molarity, Molality, Parts Per Million))
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Answer: A. Non dispersive IR spectroscopy
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