FIELD: measuring equipment.;SUBSTANCE: invention relates to measurement equipment, namely to devices for measuring concentration of gas present in the environment. Gas analyzer has two infrared radiation sources, main and additional, measuring cell, interference light filter, main and additional IR radiation receivers, two amplifiers. In the measurement cell has two openings in side wall on both sides of the optical axis. In the first opening, there is an additional photodetector (wideband), in the second opening there is one of the infrared radiation sources. Note here that distance between this source of infrared radiation and main IR radiation much less than the distance between the main source of infrared radiation and main IR radiation. Main and additional infrared radiation sources are connected through the respective amplifiers with microprocessor. Interference light filter can be built in the infrared detector. In the measuring cell the second opening is closed with a reflector around an additional source of infrared radiation.;EFFECT: invention provides higher stability and accuracy of measurement.;3 cl, 3 dwg
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