| 摘要 |
<p>A gas shutting-off apparatus includes a flow-rate sensor (2) for detecting the flow rate of a gas, and a control unit (3) which incorporates a microcomputer (6) and operates in such a manner that, when the gas continuously flows at a predetermined flow rate for a predetermined period of time, an abnormal state, such as a gas leak, is declared, and a shut-off valve (4) is automatically closed. A battery (13) is employed as a power source for the microcomputer (6) and the shut-off valve (4). To minimize the current consumption of the battery (13), the microcomputer (6) is provided with a standby function whereby the microcomputer (6) is permitted to remain in an operative state at the time when the gas flow rate is calculated and is placed in a standby state during other times such as, for example, the period of time between the moment the shut-off valve (4) is closed and the moment it is reset. Further, a display means for displaying various states is constituted by a light-emitting diode (19) as a single display member, thereby reducing the consumption of power.</p> |
