Closed-field capacitive liquid level sensor

Title: Closed-field capacitive liquid level sensor

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A liquid level sensor based on a closed field circuit comprises a ring oscillator using a symmetrical array of plate units that creates a displacement current. The displacement current varies as a function of the proximity of a liquid to the plate units. The ring oscillator circuit produces an output signal with a frequency inversely proportional to the presence of a liquid. A continuous liquid level sensing device and a two point sensing device are both proposed sensing arrangements. A second set of plates may be located inside of the probe housing relative to the sensing plate units. The second set of plates prevent any interference between the sensing plate units.

Inventors:: Kronberg, J.W.

Issue Date:: 1995-01-01

OSTI Identifier:: 463635

Assignee:: US Dept. of Energy, Washington, DC (United States) SRS; SCA: 440800; PA: EDB-97:062733; SN: 97001764386

Patent Number(s):: PATENTS-US-A8408412

Application Number:: ON: DE97003864; PAN: 8-408,412; TRN: AHC29709%%72

Contract Number:: AC09-89SR18035

Resource Relation:: Other Information: PBD: 1995

Research Org:: Westinghouse Savannah River Co., Aiken, SC (United States)

Sponsoring Org:: USDOE, Washington, DC (United States)

Country of Publication:: United States

Language:: English

Subject:: 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; LEVEL INDICATORS; LIQUIDS; DESIGN; CAPACITANCE; INTERFERENCE; OSCILLATORS; PROBES

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