| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a gas leakage alarm that enables an effective period to be correctly managed.SOLUTION: A gas leakage alarm 1 configured to be capable of transmitting/receiving data to/from a gas meter 2 provided with a time information management part 31 managing time information by a real time clock function comprises: a time information acquisition/determination part 30 that acquires the time information from the gas meter 2 upon installation of the gas leakage alarm 1, adds an effective period set in the gas meter, and then, after current time periodically acquired from the gas meter 2 passes over time of the effective period, determines that the effective period expires; and an accumulation electrification time measurement/determination part 40 that determines whether or not an accumulation electrification time from activation of a power source of the alarm 1 passes over a set effective period and, when the period elapses, determines the effective period expires. When any one of the determination parts 30 and 40 determines the expiration of the effective period, display of a lapse of the effective period is performed.</p> |
