Density control monitor

Details Density control monitor Density control monitor

H - Electricity

01

H

137/145, 306/205

H01H 35/32 (2006.01) H01H 35/28 (2006.01)

Patent

CA 1040965

Density Control Monitor ABSTRACT OF DISCLOSURE A monitor for maintaining an atmosphere of gaseous sulfur hexafluoride supplied to the chamber of an outdoor circuit breaker at a predetermined density, which is to be kept constant, comprising a switch or valve operable to connect the chamber to a source of gaseous sulfur hexafluoride at said density and to disconnect it therefrom and a sensing device comprising a constant volume tube in the chamber filled with gaseous sulfur hexafluoride at the same density as that in the chamber, a compressible bellows in the tube filled with oil, a pair of opposed cascaded bellows supporting an actuator in operable relation to the switch or valve so as to maintain the switch or value in a neutral position for any change in ambient temperature and wherein a decrease in pressure within the chamber will cause the switch or valve to be operated to supply gas pressure to the chamber.

207527

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