Fluid handling – Liquid level responsive or maintaining systems – Electrical characteristic sensing
Patent
1982-09-09
1985-07-23
Walton, George L.
Fluid handling
Liquid level responsive or maintaining systems
Electrical characteristic sensing
73304C, 307118, 361178, G01F 2326
Patent
active
045303720
ABSTRACT:
A level control apparatus is disclosed for controlling a liquid level between a maximum and a minimum. An elastic circuit generates a reference pulse which receives the pulse and triggers the generation of first and second reference pulses. The first reference pulse has a width which corresponds to the function of the maximum level of liquid and the second reference pulse has a width which corresponds to the function of the minimum of liquid. A capacitance probe supplies an output to a level sensing means which generates an output control pulse which varies in time with respect to the liquid level. A response circuit receives the first and second reference pulses and the control pulse and generates a first response when the reference pulse and the control pulse occur at a time which indicates that the fluid is at the maximum level and a second response signals when the second response indicates that the fluid has dropped to a minimum level with a time provided between the minimum and maximum where no response is developed.
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Cole Charles F.
Overton Raymond C.
Conoco Inc.
Miller William J.
Walton George L.
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