Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1979-03-19
1981-05-05
Schwadron, Martin P.
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
73304R, 137392, 307118, 361178, 417 36, 417 44, F17D 300
Patent
active
042652626
ABSTRACT:
A system for sensing and controlling the level of fluent material in a reservoir or other receptacle. In electrically conducting materials levels are sensed by low voltage direct current conduction between electrode pairs placed at desired "high" and "low" control levels which send D.C. digital logic sensing signals over connecting wires to very high resistance "high" and "low" inputs of a digital logic signal processing circuit, while nonconducting material levels are sensed by suitable transducers which upon immersion can send D.C. digital logic signals. The digital signal processing circuit receives the sensor signals and provides a digital output signal or absence thereof, depending on the relative state and sequence of the sensing signals and transmits a digital output signal to a solid state relay which controls the power of flow control means to maintain desired levels of the fluent material.
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patent: 4112318 (1978-09-01), Hamelink
patent: 4171932 (1979-10-01), Miller
Schwadron Martin P.
Walton G. L.
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