Fluid handling – Liquid level responsive or maintaining systems – Electrical characteristic sensing
Patent
1979-11-19
1981-04-07
Schwadron, Martin P.
Fluid handling
Liquid level responsive or maintaining systems
Electrical characteristic sensing
73304R, 307118, 340620, 361178, B01F 2324, G01F 2300
Patent
active
042599822
ABSTRACT:
A resistive fluid or boiler water type of detecting system has been disclosed. A single conductor type of probe having a plurality of conducting regions that are capable of conducting a bidirectional electric current in either a full bidirectional mode or in a unidirectional mode has been disclosed. The single probe element is capable of three separate and distinct states of operation. The first state is when there is an absence of current, the second is when there is a unidirectional portion of the bidirectional current flowing, and the third state is when the full bidirectional electric current is allowed to flow. An output device is responsive to these three states to provide different types or levels of control.
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Feldman Alfred N.
Honeywell Inc.
Schwadron Martin P.
Walton G. L.
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