Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent
1987-11-06
1989-02-28
Walton, George L.
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
137392, 174151, 73304C, 277 4, 277 12, 307118, 324 61P, 361178, G01F 2326, G01R 2726
Patent
active
048091294
ABSTRACT:
An improved capacitance bridge type liquid level control system for use in refrigeration applications is disclosed which provides improved apparatus for sealing the probe in its mounting and for insulating same against the condenser reservoir stand pipe in which it is mounted. Improved sealing between the probe and probe body is accomplished through an annular PTFE seal which when compressed pushes inwardly to seal a tubular PTFE insulation against annular ridges in the side of the probe rod proper. The improved probe rod shape also maintains a proper stabilized axial alignment between the probe rod and the probe body. The invention also resides in improved circuitry for the capacitance bridge liquid level control system which includes a built-in simulation circuit for testing the apparatus, improved voltage feedback damping for providing a stable circuitry utilizing digital display, light emitting diodes, improved anti-splashing circuitry for stabilizing digital display read out, and a reversed lower differential function setting for enabling the low level adjustment set point to be set more accurately heretofore known.
REFERENCES:
patent: 2926299 (1960-02-01), Rogoff
patent: 2955466 (1960-10-01), Coles
patent: 3275021 (1966-09-01), Loveless
patent: 3339411 (1967-09-01), Riffie
patent: 3360991 (1968-01-01), Hoss et al.
patent: 3391547 (1968-07-01), Kingston
patent: 3843832 (1974-10-01), Petersen et al.
patent: 4054744 (1977-10-01), Beaman
patent: 4137558 (1979-01-01), Beaman
patent: 4499766 (1985-02-01), Fathauer et al.
patent: 4530372 (1985-07-01), Overton et al.
Capacitance in Continuous Sensing, Sensors, Dec. 1986 pp. 40-41.
Solid State Liquid Level Control, Grasso Brochure SSLC-84, 1984, 4 pages.
Capacitance Probes for Level Control and Management, Endress and Hauser Bulletin 5000 Series, 4 pages, no date.
SilometerFMC 1320-1330, Endress and Hauser brochure No. FS-0106, 12-80.
LTC 1220 Continuous Capacitance Level Measurement System, Endress and Hauser Brochure No. LTC 1220 Series, 12-85, 4 pages.
Level Electrodes, Technisch Bureau Bosma, B.V., 2 pages, no date.
Technical Specifications-Liquid Level Control Type NCA, Technisch Bureau Bosma, 7 pages, No date.
Barbier William J.
Hansen, III Charles C.
Knapp Curtis H.
Kuhn, Jr. Orval J.
Yencho John A.
Hansen Technologies Corporation
Videbeck James N.
Walton George L.
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