Global to push GA events into
skip to main content

Title: Closed-field capacitive liquid level sensor

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:
Issue Date:
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

Similar records in DOepatents and OSTI.GOV collections: