| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas cut-off device shortening a time to determine that the gas-cut off device and a gas leak alarm are properly connected, and allowing a user to easily know a determination result. SOLUTION: A connection determining part 109a determines that the gas cut-off device 100 and the gas leak alarm 200 are properly connected when the number of times of reception of connection confirmation signals output rom a connection confirmation signal receiving part 106 is a predetermined number of times, that is, the same as the number of times of connection confirmation signals sent out from a connection confirmation signal sending part 104, five times, for example. COPYRIGHT: (C)2009,JPO&INPIT
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