| 摘要 |
PURPOSE:To provide an indicating device for power restoration for gas type space heater etc. by installing a part for power restoration detection to detect power failure, a transmission part transmitting its signal, a judging part judging power failure condition, and an indicating part indicating its content. CONSTITUTION:At the normal starting time of operation, a power source switch 26 is switched to ON from NC. While the switch 26 is connected with NC, current which is half-wave rectified by a diode 11 via a plug socket 9 and stored in a capacitor 14 via a resistance 12 flows through a photocoupler light emitting part 15a via a resistance 13 and then a photocoupler light receiving part 15b is put in electric continuity condition and during electric discharge time from the capacitor 14, the voltage at a point a, Va=VL. A judging part for power restoration judges that the condition is normal by VL. Next, when electric power is restored, the switch is already turned ON and electricity is not stored in the capacitor 14 and the voltage at the point a, Va=VH. The judging part 23 judges the condition of electric power restoration and the indicating part indicates its condition and a solenoid valve 25 is stopped. |
