| 摘要 |
PROBLEM TO BE SOLVED: To provide a CO sensor capable of reducing a heat capacity, capable of reducing a heating time for cleaning, capable of obtaining, in a short time, a low temperature condition for detection after finishing a cleaning period, and capable of detecting highly toxic CO gas quickly. SOLUTION: A temperature of the gas sensor 2 where a resistance value Rs indicated by the gas sensor 2 in response to a prescribed CO comes to the vicinity of the minimum value and is widely different from the resistance value Rs of the gas sensor 2 indicated when detecting a nondetecting-objective gas is found on the basis of a temperature-resistance value characteristic, and a length of a high temperature condition period, a length of a low temperature condition period, and on-duties of a transistor Q in the respective periods are determined to be set in an operation program of an arithmetic and control circuit 34. COPYRIGHT: (C)2005,JPO&NCIPI
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