Critical liquid-level warning circuit

Details Critical liquid-level warning circuit Critical liquid-level warning circuit

G - Physics

01

F

340/146

G01F 23/60 (2006.01)

Patent

CA 1049635

CRITICAL LIQUID-LEVEL WARNING CIRCUIT ABSTRACT OF THE DISCLOSURE A critical liquid-level warning circuit for association with a liquid-level indicating circuit, the indicating circuit including a sensing device that provides a voltage which varies between upper and lower voltage limits as a function of the level of a liquid. The warning circuit comprises circuitry for developing a characteristic signal when the sensing device voltage goes above or below a predetermined critical level, circuitry responsive to the characteristic electrical signal for actuating a warning device when the predetermined critical level is reached, and circuitry for establishing the operability of the warning device when electrical power initially is supplied to the warning circuit. Preferably, the warning circuit is used to indicate when the amount of fuel in the fuel tank of a motor vehicle has fallen to a predetermined critical level, and preferably circuitry is provided for preventing false low-fuel warnings.

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