| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas detector capable of improving detection sensitivity of a gas to be detected by heightening an amplification factor even in the case of the occurrence of an error potential difference due to the difference in temperature rise characteristics between a sensing element and a compensation element of an adsorption combustion gas sensor. SOLUTION: The gas detector 1 includes an amplification part 6a for amplifying a midpoint potential difference of a bridge circuit 2 provided with the adsorption combustion gas sensor 15 at a prescribed amplification factor; an offset voltage generating part 8 for generating a plurality of offset voltages different from one another; and a voltage addition part 6b for adding the offset voltages to an amplified midpoint potential difference. The gas detector 1 is provided with an offset voltage changeover means 61a for controlling the offset voltage generating part in such a way as to output such an offset voltage as to minimize an error potential difference equal to a prescribed minimum voltage or greater from among the plurality of offset voltages on the basis of offset voltage changeover information during the transition period of a temperature rise of each element. COPYRIGHT: (C)2011,JPO&INPIT
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