FIELD: instrumentation. SUBSTANCE: device includes resonance gaseous-discharge IR radiation source with hollow cathode and wide-band filter, measurement dish to place investigates gas mixture, interference filter, radiation detector and analyzer put in series on optical axis of radiation source. Novelty of device lies in its filling with lower nitrogen oxide NN2OO under pressure of 0.55-0.80 mm Hg. Sensitivity of device increases by factor of two as compared with device of similar purpose with wide-band radiator. Radiation power value stabilizes after several switches on of source. EFFECT: increased sensitivity of device. 3 dwg
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