Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1989-09-05
1991-01-29
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
73290R, 340612, 361284, G01F 2326
Patent
active
049877763
ABSTRACT:
A storage installation which is capable of storing a variety of free-flowing materials, both conductive and non-conductive, includes a level sensing device which may be disposed either exteriorly or interiorly thereof. The device has either one or a plurality of level sensor and sensor circuit pairs which are preferably disposed vertically within a non-electrically conducting tube which may be hermetically sealed from contact with the stored material. The level sensors comprise respective sensing capacitors, each having effectively a single plate construction. Grounded electrical contacts, if relatively adjacent, may comprise the other side of the effective sensing capacitor. Electrostatic force lines flow outward from the sensing capacitor(s), and are differentially interfered with by the presence or absence of materials or objects to be sensed. Such interference affects the dielectric constant of the respective sensing capacitor, which can in turn be detected to drive a level indicator display.
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Cuchlinski Jr. William A.
Dowling William C.
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