| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas detection system in which detection time can be shortened and besides the cost can be suppressed. <P>SOLUTION: A contact combustion type hydrogen sensor 10 is constituted of a detection element S and a temperature compensation element R. This sensor includes a control device 19 in which, when hydrogen concentration is less than a predetermined hydrogen concentration, a changeover switch SW is switched to a fixed resistor Rm3 side and the temperature compensation element R is operated by a heat conduction type to detect the hydrogen concentration, and, when the hydrogen concentration is equal to or more than the predetermined hydrogen concentration, the changeover switch SW is switched to the detection element S side and the temperature compensation element R and the detection element S are operated by the contact combustion type to detect the hydrogen concentration. <P>COPYRIGHT: (C)2012,JPO&INPIT |
