| 摘要 |
PROBLEM TO BE SOLVED: To improve the detection precision by reducing the amount of attachment of water to the hydrogen sensor to be used in the fuel cell system, etc. SOLUTION: A detection head 13, with built in detection element 24 and the reference element 23 arranged in the detection gas flow flowing in the piping 2, is protruded into the piping from the wall part of the piping 2, while being supported by the support arm 12 which is made of a heat insulating material. The detection head 13 is provided with a gas guide in port 25 for guiding the detection gas to the detection element 24, in a direction reverse to the gas flow direction. COPYRIGHT: (C)2008,JPO&INPIT
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