Topic The measurement person mistaking in the end mount of the discharge channel in order, to adjust the sample gas flow rate which is introduced into the sensing station touching, it makes difficult to cause the measurement malfunction. Solutions In end mount 5 of discharge channel 3 of the one which is exposed outside the device, other than the aperture end face lap in the wall of the pipe conduit multiple exhaust air paths 5a and 5b are guaranteed by the fact that Perforating facilities it does the hole. Because of this, the measurement person mistaking, closing the exit on the one hand of exhaust air path, because it can do the smooth exhaust air through other exhaust air path, passing capacity dummy column 7, capacity of the sample gas which flows to hydrogen flame ionization detector 10 cannot fluctuate, can prevent the fact that the measurement malfunction happens. Choice figure Drawing 1
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