The present invention is for a gas measuring device of the industrial chimney, for this purpose, the present invention is fixed to the outside from one side of the chimney (50) for transmitting and receiving the transmission and reception unit 10, from one side of the transmission and reception unit 10 An inner penetrates one side of the chimney 50 so that a predetermined length is inserted into the gas check region 23 formed to vertically penetrate a part of the exhaust gas discharged through the chimney 50. In-situ probe device of the gas measuring device of the industrial chimney, which is provided as a probe-shaped detection unit 20 of the double pipe structure of the pipe 21 and the outer pipe 22, the gas check region of the detection unit 20 The air curtain area 30 is provided at both ends at 23, and concentrically with the inner pipe 21 of the sensing part 20 through which light passes from the air guide 24 of the air curtain area 30. To be formed One light passage hole 241 is extended downward so that the lower portion is located below the inner pipe 21, the height can be adjusted on the inner side in the lower portion of the light passage hole 241 of the air guide 24 An air control plate 40 is provided to adjust the height of the air control plate 40 to minimize air leakage to the gas check area 23 through the light passage hole 241 of the air guide 24. It is characterized in that the concentration of the exhaust gas is uniformly detected so that more accurate and safe gas measurement and inspection efficiency of the device are further improved while reducing manpower and time and improving safety of operation.;Industrial chimney, emissions, gas measurement, air curtain
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