| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a gas leak alarm from malfunctioning in a case of voltage variation with simple constitution. <P>SOLUTION: A gas leak alarm includes driving voltage detection means 1 of detecting a driving voltage supplied from a voltage source 4 supplying a driving voltage to a gas sensor 2, first determination means 1 of determining whether or not the driving voltage detected by the driving voltage detection means 1 is not within a predetermined normal range, second determination means 1 of determining whether or not a determination state in which the first determination means 1 has determined that the driving voltage is not within the predetermined normal range remains for a predetermined time, and control means 1. The control means 1 does not use sensor output for alarm determination to output no gas leak alarm when the first determination means 1 determines that the driving voltage is not within the predetermined normal range, and outputs a failure alarm indicating failure of the alarm when the second determination means determines that the state in which the driving voltage is not within the predetermined normal range remains for the predetermined time. <P>COPYRIGHT: (C)2013,JPO&INPIT |
