Liquid level gauge for tanks

Details Liquid level gauge for tanks Liquid level gauge for tanks

1989-02-14

1991-01-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, G06K 715

Patent

active

049838555

ABSTRACT:
A liquid level gauge for tanks includes a float located in the tank to follow the level of liquid in the tank. A cable extends from the float to the top of the tank and over a pulley to the outside of the tank, where it is attached to a weight for maintaining tension in the cable. The pulley is attached to a signal generator that generates two electrical signals. These are lead from the signal generator to a counter which decodes the two signals and produces a running count representing the height of liquid in the tank. The preferred embodiment of the invention uses a segmented optical disk and two phototransistors for producing two out of phase pulsed signals. The number of pulses represents the magnitude of float movements, while the sequence of the phase-shifted pulses represents the direction of float movement.

REFERENCES:
patent: 4254334 (1981-03-01), Baud
patent: 4320394 (1982-03-01), John, Jr.
patent: 4342996 (1982-08-01), Jannotta
patent: 4358960 (1982-11-01), Porter
patent: 4804944 (1989-02-01), Golladay et al.

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