G - Physics – 08 – B
Patent
G - Physics
08
B
324/33
G08B 21/00 (2006.01) G01R 31/02 (2006.01) G08B 21/20 (2006.01)
Patent
CA 1235458
"APPARATUS FOR MONITORING CIRCUIT INTEGRITY" Abstract of the Invention An apparatus to monitor a circuit in which an AC voltage source is connected to a plurality of paralleled current consuming loads, such as heaters, including a reactive load in parallel with the current consuming loads at a point in the circuit more distant from the voltage source than any of the current consuming loads being monitored, a phase shift detector connected to the current consuming loads and at a point in the circuit between the voltage source and the nearest current consuming load being monitored, the phase shift detector being sensitive to the shift in current phase induced by the reactor load, and an alarm connected to and actuated by the phase shift detector which provides a warning when the phase shift induced by the reactive load is lost, indicative of a failure in the circuit.
502678
Brown David O.
Pappano Thomas W.
Borden Ladner Gervais Llp
General Signal Corporation
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