| 摘要 |
PROBLEM TO BE SOLVED: To reduce install time of a gas leak alarm while preventing misalarming due to variation of an air base caused when a gas sensor 1' of the gas leak alarm is energized and heated. SOLUTION: The gas sensor 1' is used, such that a sensor output from start of energization of the gas sensor 1'until when the air base enters a stationary state has the same polarity with a stationary alarm determination value (Vo) determined for the air base in the stationary state. A power circuit 2 starts energization and heating of the gas sensor 1'. A determination value reset time Ti is set for only a prescribed time (20 seconds) right after the energization and heating are started. Within the determination value reset time Ti, an alarm determination made using a comparison of the level of a sensor output with the alarm determination value is not made to prevent misalarming due to variation of the air base. Within the determination value reset time Ti, an alarm by an inspection gas is output on the basis of change in direction of gas detection sensitivity of the sensor output. A stationary alarm determination value is set after the determination value reset time Ti passes. COPYRIGHT: (C)2010,JPO&INPIT
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