| 摘要 |
PROBLEM TO BE SOLVED: To suppress releasing of hydrogen from a metal surface, and to make improvable the gas analyzing accuracy by forming a cylindrical vessel main body having respectively valves on both ends out of copper. SOLUTION: A vessel main body is formed of a copper pipe body 2 having a prescribed length and diameter, domed copper end plates 3 in opening parts of both ends and a bush 4 installed in a through hole 3a of the center, and the sampler 1 is formed of this vessel man body and a valve 7 connected to the bush 4 via a short pipe 5 and a joint 6. In the pipe body 2, the end plates 3 and the bush 4, these contact gas surfaces are polished before joining, adsorption/desorption of impurity is restrained, and joining of respective members is desirably electron beam welding. Thus, hydrogen is not released into sample gas from respective metallic surfaces, so that hydrogen quantity as an impurity in high purity inert gas can be accurately analyzed.
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