Liquid level sensor

Details Liquid level sensor Liquid level sensor

1974-05-17

1976-03-16

Caldwell, John W.

Communications: electrical

Systems

Call station

310 82, 310 86, 310 81, 310 91, 331 65, G08B 2100, H01L 2720

Patent

active

039449947

ABSTRACT:
A liquid level sensor for determining the liquid level in a container includes an oscillator having a feedback path including first and second piezoelectric elements mounted in a turning fork arrangement to provide a first mechanical coupling path between said elements across one end of the turning fork. This first coupling path provides a first feedback signal of one given phase. A second mechanical coupling path between said elements is provided only via the liquid when the liquid is present to a level sufficient to immerse the piezoelectric elements. The second coupling path, when present, provides a second feedback signal of opposite phase to the first feedback signal. The presence or absence of the second feedback signal determines the oscillation or non-oscillation condition of the oscillator.

REFERENCES:
patent: 1912213 (1933-05-01), Nicholson
patent: 3625058 (1971-12-01), Endress et al.
patent: 3745384 (1973-07-01), Blanchard
patent: 3766616 (1973-10-01), Staudte

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