Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1988-07-12
1989-04-11
Shoap, Allan N.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
364509, G01F 2300
Patent
active
048194832
ABSTRACT:
A level indicator control system including a microprocessor that controls the height and, therefore, the amount of the substance, such as fluid or granular solid, to be contained in a closed or open tank or vessel. The system provides calibrated digital or analog output that shows the extent to which the tank is filled with substance at substantially any level. A scale, in percent, each value representing the percentage of fullness of the tank, is produced after low and high limits, representing any low and high substance levels respectively, are provided to the microprocessor. The scale values are a function of the changes in capacitance between the stationary probe and the tank wall as the level of substance approaches or submerges the probe. The system finds its probe capacitance and sets its own high and low control set point limits automatically. Thereafter, the system uses the instantaneous probe capacitance and the capacitance values representing the high and low substance levels to provide the calibrated digital or analog output. For example, when the substance in the tank exceeds the high limit set point value, the control system prevents more fluid or granula solid from entering the tank.
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Daily Donald Y.
Emplit Raymond H.
Custom Controls Co., Inc.
Shoap Allan N.
Worth W. Morris
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