Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1974-12-26
1977-03-08
Queisser, Richard C.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
G01F 2326
Patent
active
040106500
ABSTRACT:
Apparatus for generating an electrical signal indicative of the level of a liquid stored in a reservoir. The apparatus includes first and second probes spaced from one another and extending into the reservoir. Each of the probes includes a metal electrode surrounded by a preferably dielectric material. The liquid to be measured contacts the dielectric material, but does not directly contact the electrodes. A preferably alternating voltage is applied across the electrodes and the impedance therebetween is sensed. The impedance between the electrodes varies as a function of the level of the liquid in the reservoir and this impedance is substantially greater than the impedance between the probe areas of contact with the liquid. In effect, the liquid is treated as a conductor because its impedance is negligible as compared to the impedance between the probe electrodes, this impedance varying as a function of liquid level.
REFERENCES:
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patent: 2908166 (1959-10-01), Johnson
patent: 2950426 (1960-08-01), Frome
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patent: 3475960 (1969-11-01), Miller
patent: 3678749 (1972-07-01), Harper
patent: R23493 (1952-05-01), Edelman
Brown Robert W.
Ford Motor Company
Queisser Richard C.
Yasich Daniel M.
Zerschling Keith L.
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