| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas sampler capable of preventing the surface of a catalyst from being deteriorated by the drain caused by the dew condensation in each pretreatment part immediately after an energization or catalytic efficiency is deteriorated by the oxidation of a catalyst caused by the suction of the atmosphere at the time of stop of a boiler. SOLUTION: In a gas sampling flow channel 4 equipped with a pretreatment part 8 for performing the pretreatment of the sample gas S supplied to a gas analyzer 5, three-way changeover valves 9 and 10 are respectively provided on the upstream and downstream sides of the pretreatment part 8 and connected so as to bypass the pretreatment part 8. COPYRIGHT: (C)2005,JPO&NCIPI
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