Sensing apparatus

Details Sensing apparatus Sensing apparatus

1979-09-17

1981-03-10

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307358, 307130, 361 87, 340661, 340664, G08B 2100

Patent

active

042556694

ABSTRACT:
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).

REFERENCES:
patent: 3249929 (1966-05-01), Sillers
patent: 3678295 (1972-07-01), Heneghan
patent: 3789236 (1974-01-01), Lacroix
patent: 3958212 (1976-05-01), Henthorne
patent: 4034269 (1977-07-01), Wilkinson

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