As in the gas sampling device and the sample gas channel which

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