Overfill sensing system

Details Overfill sensing system Overfill sensing system

1987-02-10

1988-10-25

Orsino, Jr, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

73304C, 200 612, 324 61R, 137392, 137386, 361284, G08B 2100

Patent

active

047807059

ABSTRACT:
An overfill sensing system uses a capacitive sensor (12) on the interior of a tank for sensing the presence of a liquid to cease the filling process. The capacitive sensor (12) includes a sensing capacitor (16) and a reference capacitor (18) on separate arms of a bridge circuit (22). An oscillator (28) supplies an AC signal to the bridge circuit (22) divided by a variable resistor (30 ) to balance the bridge (22). A comparator (24) receives the output on each arm of the bridge (22) to sense a differential therebetween. When a liquid reaches the sensing capacitor (16), the capacitance changes from a predetermined capacitance, thereby changing the differential. A control circuit (14) is responsive to the differential at the output of the comparator (24) for visually indicating the status of the filling process and ceasing the filling process from the filling facility when a liquid has been detected.

REFERENCES:
patent: Re27829 (1973-12-01), Tiffany
patent: 3657556 (1972-04-01), Foster
patent: 4020488 (1977-04-01), Martin
patent: 4171932 (1979-10-01), Miller
patent: 4231025 (1980-10-01), Turner, Jr.
patent: 4244385 (1981-01-01), Hotine
patent: 4555941 (1985-12-01), Fathauer
patent: 4639611 (1987-01-01), Sticher

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