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The prototype of the device for simultaneous measurement of the trace concentrations of CO2 (1.6 μm), CH4 (1.65 μm) and NH3 (1.51 μm) gases based on the diode heterolasers with one-mode fiber radiation output has been presented. The three-channel gas analyzer was operated using DAQ Station National Instruments PXI-6289M and the mode of time multiplexing for three independent laser sources. The achieved gas analyzer sensitivity within 100 m distance for CH4 was ~ 300 ppb, for CO2 - 30 ppm and for NH3 - 0.5 ppm.

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