Liquid level detecting apparatus

Details Liquid level detecting apparatus Liquid level detecting apparatus

1977-01-31

1978-08-29

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

73304R, 331 65, 340 59, G08B 2100

Patent

active

041107403

ABSTRACT:
A liquid level detecting apparatus for detecting the level of a conductive liquid, comprises a pair of electrodes which are either connected with or disconnected from each other depending on the liquid level, an oscillation circuit which is variable in the state of its oscillation signal in response to the variation in impedance between the pair of electrodes and applies between the pair of electrodes an AC signal in synchronism with the oscillation signal, and a switching circuit which detects the liquid level in response to the oscillation signal, whereby dissolution of ions from the electrode into the liquid is prevented.

REFERENCES:
patent: 3254333 (1966-05-01), Baumoel
patent: 3694804 (1972-09-01), Hill

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