| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate false information of a gas meter on a leakage of gas by discontinuing a heat-restraining operation during a heat-retaining operation discontinuation time being equal to or longer than a reference time at every time when a prescribed interrupt time passes and by restarting the heat-retaining operation after the heat-retaining operation discontinuation time passes. SOLUTION: When a heat-retaining operation is started, a control device 16 sets an interrupt time, a heat-retaining pause time and a heat-retaining operation discontinuation time in timers making up an internal timer 22 respectively. The heat-retaining pause time determines a time interval for repeating reheat for retaining heat and it is set to be shorter than a reference time. The heat- retaining operation discontinuation time is a continuous time for discontinuing the heat-retaining operation forcibly for a while every time when the interrupt time passes and it is set to be equal to or longer than the reference time. Accordingly, false detection of a leakage of gas on the gas meter side can be prevented.</p> |
