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Title: Closed-field capacitive liquid level sensor

Abstract

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. 12 figs.

Inventors:
Issue Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
597174
Patent Number(s):
5722290
Application Number:
PAN: 8-408,412
Assignee:
Dept. of Energy, Washington, DC (United States)
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 3 Mar 1998
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; LEVEL INDICATORS; DESIGN; MEASURING METHODS; ELECTRIC CURRENTS; ELECTRONIC CIRCUITS

Citation Formats

Kronberg, J W. Closed-field capacitive liquid level sensor. United States: N. p., 1998. Web.
Kronberg, J W. Closed-field capacitive liquid level sensor. United States.
Kronberg, J W. Tue . "Closed-field capacitive liquid level sensor". United States.
@article{osti_597174,
title = {Closed-field capacitive liquid level sensor},
author = {Kronberg, J W},
abstractNote = {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. 12 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {3}
}