FIELD: measuring technology; warning of fire and explosion hazard in flying and space vehicles in case of leakage of gases. SUBSTANCE: warning unit includes optical measuring channel made in form of radiation source and light filter which are optically connected, photodetectors, microprocessor for comparison of measured signals with threshold magnitude for oxygen and hydrogen, gas main connected with optical measuring channel, semiconductor channel for measuring oxygen and hydrogen, measuring reference chamber filled with gas of constant composition, microprocessor for conversion of signals of optical and semiconductor channels into signal proportional to partial pressure of hydrogen. EFFECT: enhanced efficiency of generating the signal warning on fire and explosion hazard due to selective measurement of low concentration of oxygen and hydrogen. 1 dwg
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