FIELD: optical instrumentation engineering. SUBSTANCE: gas analyzer has a device for regulating the amounts of mixture to be analyzed in the measuring chamber made in the form of a passage which is in communication with a vessel and is provided with a stream shut-off valve; an illuminating system may be built up of two lenses; a light detector is in the form of a pyroelectric dynamic detector. EFFECT: more reliable protection against operation hazard. 3 cl, 1 dwg
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