HYDROGEN GAS SENSOR
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United States of America Patent
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Issued Date -
Feb 5, 2009
app pub date -
Feb 27, 2007
filing date -
Feb 27, 2006
priority date (Note) -
Abandoned
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Abstract
The present invention provides a catalytic combustion type hydrogen gas sensor of a simple structure, which is capable of inhibiting the degradation of the sensitivity thereof over a long period of time even in the presence of a silicon compound being a catalyst poison. This hydrogen gas sensor is equipped with a detection element 1 having a sensing part 2 and a silicon trapping body 3. The sensing part 2 has a function of being heated by Joule heat generated by energization of the sensing part 2, a function of combusting hydrogen gas while being heated, and a function of outputting a change in electrical resistance of the sensing part 2 indicative of hydrogen gas concentration, the change in electrical resistance being caused by an increase in temperature of the sensing part 2 caused by the combustion heat of the hydrogen gas. The silicon trapping body 3 covering the sensing part 2 contains a silicon-trapping material that functions to trap a silicon compound from a gaseous matter passing through the silicon trapping body 3.
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