| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in a conventional gas cutoff device that a cutoff valve can not be operated after a specific time even when the deterioration of battery voltage is detected during the determination when the deterioration of battery voltage is intermittently determined at every specific time, because of the individual dispersion of a battery of a battery power source part and the dispersion of internal resistance of the battery depending on the use environment, when the battery power source is used over a specific use capacity, further the battery is remarkably consumed when a short time interval is set to determine the deterioration of the battery voltage to prevent the above-mentioned problem, and it is necessary to increase the battery capacity of the battery power source part to keep the time limit for use of the gas cutoff device, which is not economical. SOLUTION: A battery operating time determination part 12 clocks the operating time from the start of the supply of the battery power source part 9 by a battery operating time clocking part 10, and outputs a clocking signal when the operating time is over the time limit for use determined by a battery use time limit setting part 11. The time interval for determining the deterioration of the battery voltage by a battery deterioration determining part 13 is shortened after the input of the clocking signal, in comparison with that before the input of the clocking signal, on the basis of the clocking signal. COPYRIGHT: (C)2005,JPO&NCIPI
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