FIELD: mining engineering. SUBSTANCE: device has infrared radiation source with collimator and photoreceptor with modulator placed on the opposite sides of gas volume under control having thickness d, indicating and registering unit, five transducers, difference measuring units, three relation measuring units, difference measuring unit and relation measuring unit connected in series, additional photoreceptor, calculating unit, relation measuring unit, three difference measuring units and ten circuits made of amplifier and band filter connected in series, where an additional photoreceptor is placed outside of collimated infrared radiation beam behind the modulator, both photoreceptors being five-banded with registering radiation wavelengths 1.3-1.7 mcm, 3.0-3.4 mcm, 4.1-4.5 mcm, 4.5-4.7 mcm and 7.6-7.8 mcm. EFFECT: enhanced accuracy of control. 7 dwg
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