Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1981-11-06
1984-08-28
Goldberg, Gerald
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
G01F 2326
Patent
active
044676468
ABSTRACT:
A device for the capacitive measurement of liquid levels, particularly in an automobile tank has a measurement sensor with measurement electrodes arranged concentric to each other forming a measurement capacitor, the space between the measurement electrodes communicating at a variable height with the liquid to be measured, and a channel within an inner of the measurement electrodes through which the liquid is drawn up. Compensation electrodes form a compensation capacitor in a suction path of the liquid with a constant level of the liquid by which the influence of different dielectric constants of the liquid on the result of a measurement is compensatable in an evaluation circuit to which the measurement capacitor and the compensation capacitor are connected. A sump vessel has a bottom disposed lower than an upper opening of the channel within the inner measurement electrode. The compensation electrodes are arranged in the sump vessel. An overflow is in liquid-conducting communication with the channel and the sump vessel, and a suction tube for the liquid extends substantially to the bottom of the sump vessel.
REFERENCES:
patent: 4204427 (1980-05-01), Gothe et al.
patent: 4235106 (1980-11-01), Maltby et al.
patent: 4296630 (1981-10-01), Jung et al.
Berryman Walter H.
Hamley Adrian H.
Korb Joseph
Manson Peter J.
Farber Martin A.
Goldberg Gerald
Roskos Joseph W.
VDO Adolf Schindling AG
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