Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1980-07-17
1982-09-07
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
324 61P, 331 65, 361272, G01F 2326, H03J 102
Patent
active
043477410
ABSTRACT:
A capacitive system for sensing the level of material includes a conductive member electrically connected to ground potential, a probe including a sensing element arranged to establish a capacitance between the sensing element and conductive member which is determined by the level of the material and a shielding element interposed between the conductive member and the sensing element to form an electrically neutral zone therebetween to thereby reduce the effect of a conductive buildup of the material on the probe on the capacitance between the conductive member and the sensing element, and a first circuit electrically connected to the sensing and shielding elements for applying generally the same electrical potential to both the sensing and shielding elements, the first circuit having an output which varies in response to a change in the capacitance between the conductive member and the sensing element. A device for measuring an electrical characteristic of the shielding element which is related to the conductivity of the buildup of material on the probe is electrically connected to a second circuit which, through a feedback loop connected to the first circuit, automatically adjusts the sensitivity of the first circuit in response to changes in the electrical characteristic to compensate for a highly conductive buildup of material on the probe.
REFERENCES:
patent: 3119266 (1964-01-01), Atkinson
patent: 3706980 (1972-12-01), Maltby
patent: 3781672 (1973-12-01), Maltby et al.
patent: 3879644 (1975-04-01), Maltby
patent: 3918306 (1975-11-01), Maltby
patent: 4145927 (1979-03-01), Larson
patent: 4146834 (1979-03-01), Maltby et al.
patent: 4208909 (1980-06-01), Maltby et al.
Endress & Hauser, Inc.
Yasich Daniel M.
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