Capacitive liquid level sensor

Details Capacitive liquid level sensor Capacitive liquid level sensor

1990-01-18

1990-12-18

Raevis, Robert

Measuring and testing

Sampler, sample handling, etc.

Capture device

G01N 3506

Patent

active

049777866

ABSTRACT:
A capacitance liquid level sensor uses an oscillator and sweeps the oscillator frequency at an ultrasonic rate thereby spreading the frequency spectrum and reducing interference from external radio transmitters and interference to local radio receivers.

REFERENCES:
patent: 3391547 (1968-07-01), Kingston
patent: 3635094 (1972-01-01), Oberli
patent: 3939360 (1976-02-01), Jackson
patent: 4099167 (1978-07-01), Pomerantz et al.
patent: 4326851 (1982-04-01), Bello et al.
patent: 4635478 (1987-01-01), Hope
patent: 4736638 (1988-04-01), Okawa et al.
patent: 4818492 (1984-04-01), Shimizu
patent: 4829837 (1989-05-01), Telfer
patent: 4873875 (1989-10-01), Cork

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