G - Physics
01
R
324/58
G01R 19/145 (2006.01) G01R 31/00 (2006.01) G08B 21/20 (2006.01)
Patent
CA 1164049
D-21980 ABSTRACT OF THE DISCLOSURE Sensing apparatus for monitoring the operation of an electrical appliance. The sensing apparatus is plugged into a standard electrical outlet and the appliance to be monitored is plugged into the sensing apparatus. The appliance current flows through a transformer in the sensing apparatus. Detection circuitry including a comparator produces one signal when current flow through the transformer is negligible (appliance off) and another signal when the current flow through the transformer is significant (appliance on). Transistor circuitry connected to the detection circuitry produces a pulse at one output terminal on a transition from the one signal to the other signal from the detection circuitry (appliance turned on) and produces a pulse at another output terminal on a transition from the other signal to the one signal from the detection circuitry (appliance turned off).
360117
Gte Laboratories Incorporated
R. William Wray & Associates
LandOfFree
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