Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent
1981-11-20
1984-01-24
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
73304C, G01F 2326, H01G 700
Patent
active
044280262
ABSTRACT:
A probe for the measurement of the level of conductive materials within a conductive vessel is disclosed which is particularly suitable for the measurement of the level of conductive granular materials such as coal or other minerals or plastics or vegetable matter which are conductive. In a preferred embodiment the probe comprises a conductive steel core covered with a layer of insulating plastic and covered further with a layer of a semi-conductive material which preferably comprises a plastic which has been partially filled with a conductive material such as carbon black. Other embodiments wherein the probe may comprise a conductive plate covered by insulation further covered by a similar semi-conductive layer are also disclosed. Reference is made to prior art disclosures of circuitry and theory which enable the use of the probe of the invention.
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Benning, Jr. Jack G.
Loewenstern Kenneth M.
Maltby Frederick L.
Drexelbrook Controls, Inc.
Griffin Donald A.
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