| 摘要 |
PURPOSE:To eliminate the need for fitting operation for individual components and wiring operation for wiring from respective components to a printed board by uniting all components regarding gas breaking control on the printed board. CONSTITUTION:A pressure switch 12' detects an abnormal pressure loss is a gas passage. A seismoscope 13' detects a earthquake larger than a prescribed seismic coefficient. A gas breaking control circuit 11 inputs the signal of the pressure switch 12' and the signal of the seismoscope 13', decides abnormal flow rate of gas, and controls a gas circuit-break valve 10 according to the decision output. Those pressure switch 12' seismoscope 13', and gas breaking control circuit 11 are all mounted on the same printed board 5'. Consequently, the individual components need not be fitted at individual places and no lead is required for wiring, so wiring operation is facilitated.
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