Multi-channel gas analyzer includes source of radiation, working cuvette and parabolic mirror in focus of which photo-receiver is placed, those are arranged at one optical axis, at that the output of photo-receiver through amplifier is connected to block for processing electric signals to which are included analog-digital transformer, microprocessor and device for indication. Source of radiation includes n2 active elements with p-n transitions that emit in maxima at wavelengths agreed with wavelength in maximum of band of natural absorption of analyzed gas for each of n2 set temperature intervals, respectively, at that duration of operation of active elements with p-n transitions for each temperature interval is determined by temperature indicator and active elements with p-n transitions are activated with electric current in puklse mode with same or different duration.
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