Capacitive fluid level sensor

Details Capacitive fluid level sensor Capacitive fluid level sensor

1990-05-07

1992-04-07

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

73304C, G01F 2326

Patent

active

051033682

ABSTRACT:
A device that determines liquid level or volume by means of charging a plurality of capacitors in sequence. Each capacitor is charged for a fixed time interval. The voltage level obtained is a function of the liquid level and is compared with a known voltage to obtain an output signal that can be used to represent liquid depth. The capacitors are formed by two concentric tubes, one inside the other in a spaced relationship. The tubes reduce the effect of sloshing in the tank, resulting in a more stable reading. To measure volume or level in an irregular shaped tank, the capacitors can be arranged in a non-linear manner. The device has no moving parts to wear out and thus results in higher reliability and longer life.

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patent: 2998559 (1961-08-01), Smith
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patent: 4099167 (1978-07-01), Pomerantz et al.
patent: 4295370 (1981-10-01), Bristol
patent: 4601201 (1986-07-01), Oota et al.
patent: 4806847 (1989-02-01), Athertone et al.
patent: 4943889 (1990-07-01), Ohmatoi

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