Liquid level tamper alarm

Details Liquid level tamper alarm Liquid level tamper alarm

1974-04-26

1976-02-17

Caldwell, John W.

Communications: electrical

Selective

Having indication or alarm

73308, 73313, 340177VA, 340181, 340244R, B60Q 100

Patent

active

039394719

ABSTRACT:
A liquid level transducer actuates a relay to sound an alarm when there is a change in a liquid level in a tank. A bridge circuit is balanced at an existing liquid level to maintain the relay normally deenergized. A change in the liquid level unbalances the bridge circuit causing the relay to be energized. The system may be applied to stationary storage tanks or to vehicle fuel tanks to warn of theft of fuel. In a vehicle application an unauthorized movement of the vehicle would also cause sufficient shifting of the fuel in the tank to sound the horn and give warning.

REFERENCES:
patent: 2630007 (1953-03-01), Howe et al.
patent: 2756410 (1956-07-01), Tobias
patent: 3054994 (1962-09-01), Haram
patent: 3082412 (1963-03-01), Sargent
patent: 3335414 (1967-08-01), Meserow
patent: 3668681 (1972-06-01), Kaplan
patent: 3772641 (1973-11-01), Grosser et al.

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