GAS COMPONENT MEASURING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a gas component measuring apparatus capable of reducing purge gas and facilitating ensuring the utility of instrumentation air.SOLUTION: The gas component measuring apparatus of the present invention comprises: a laser-light emitting unit that emits laser light L for analyzing flue gas G; a laser-light receiving unit receiving the laser light L transmitted from a light transmission member and detecting a light intensity of the laser light L; a transmission-side light transmission cylinder 211 disposed within a measuring-target-gas flow passage and transmitting the light emitted from the laser-light emitting unit toward a measuring region provided within the flow passage; a receiving-side light transmission cylinder 212 disposed within a flow passage for the flue gas Gand transmitting the laser light L transmitted from the transmission-side light transmission cylinder 211 to the laser-light receiving unit via a measuring region Z; and a light transmissive plate 26 provided in at least one of the transmission-side light transmission cylinder 211 and the reception-side light transmission cylinder 212 and preventing the penetration of the flue gas Ginto the transmission-side light transmission cylinder 211 and the reception-side light transmission cylinder 212.SELECTED DRAWING: Figure 6