Rod-like probe for the capacitive measurement of the level in a

Details Rod-like probe for the capacitive measurement of the level in a Rod-like probe for the capacitive measurement of the level in a

1981-07-14

1984-05-22

Frankfort, Charles

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

361284, 324 61P, G01F 2326

Patent

active

044494050

ABSTRACT:
Disclosed is a capacitance level measuring device comprised of a container whose level is to be measured and a probe inserted into and spaced from the container. The capacitance between the probe and container varies in relation to the level in the container. A capacitance measuring circuit determines the capacitance between the probe and container and thus indicates the level in the container. The integrity of the probe is verified by constructing the probe so as to include it in a series circuit, as well as the capacitance measuring circuit, and a lack of continuity in the probe is indicative of questionable probe integrity. The question as to the probe's integrity would indicate a questionable level indication from the capacitance measuring circuit. Various probe constructions are also disclosed.

REFERENCES:
patent: 2375084 (1945-05-01), Coroniti
patent: 3902157 (1975-08-01), Kita
patent: 4204190 (1980-05-01), Wiley

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