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 1038060

CRITICAL LIQUID-LEVEL WARNING CIRCUIT ABSTRACT OF THE DISCLOSURE A critical liquid-level warning circuit for assoc- iation with a liquid-level indicating circuit, the 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 is particularly suitable for use in indicating a low fuel level in the fuel tank of a vehicle and, in the preferred embodiment, includes a first operational amplifier responsive to the sensing device voltage and a second operational amplifier that controls the actuation of a warning device. A delay circuit is interposed between the first and second operational ampli- fiers. The output of the first operational amplifier changes from one condition to another condition upon occurrence of a critical liquid level. The delay circuit provides a voltage which varies in magnitude as a function of time elapsed subsequent to the change in condition of the output of the first operational amplifier. This variable voltage controls the second operational amplifier. Prefer- ably, the second operational amplifier. circuit includes means for delaying the de-actuation of the warning device, thereby, to prevent intermittent warning device operation.

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