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Recently developed mid-JR LED non-dispersive gas analyzers can replace conventional infrared gas monitors. The advantages of novel analyzers are compact size, fast response and low power consumption. JnAsSb(P)-and JnGaAs(Sb)-based LEDs developed and manufactured at Joffe Physico-Technical Institute suitfor optical gas sensing well because of narrow emission band and the possibility of making LED emission peak spectrally matched with the gas absorption maximum. We present estimations ofgas detection limits for LED based optical sensors, sensor head constructions and some experimental results for C02 and CH4 detectors based on LED-PbSe photoresistor and LED -JnAs photodiode optopairs.

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