SF6 GAS FILLING LOAD-SWITCH WITH GAS LEAK DETECTOR

PURPOSE:To simplify the construction of a whole device, and also to detect gas leakage correctly by making an alarm generated an alarm generation means by a circuit, when an output voltage of a semiconductor type pressure sensor for detecting gas pressure inside a load-switch, reaches the reference voltage of a gas leak detector circuit. CONSTITUTION:When gas inside a sealed container 1 gradually decreases, outside air invades therein and SF6 gas concentration reaches 50% and outside air concentration reaches 50%, output voltage corresponding to its pressure is output from a semiconductor pressure sensor 11 to a gas leak detector circuit 12. The circuit 12 inputs the output voltage to a non-reversal input terminal of a voltage comparator 28 through a temperature compensating circuit 25, to compare it with the reference voltage. When air invades in the container 1 filled with SF6 gas, a low level voltage is output from the comparator 28 to a lock mechanism device 8 and an alarm indicating device 9 and the device 8 holds the condition of a moving contact 2 through a driving axis 6, thus alarm is generated from the device 9 to inform gas leakage to workers.