G - Physics – 01 – F
Patent
G - Physics
01
F
340/141, 341/34,
G01F 25/00 (2006.01)
Patent
CA 1208336
A LEVEL INDICATOR CONTROL SYSTEM FOR USE WITH CAPACITANCE PROBES IN TANK CONTAINING SUBSTANCES Abstract of the Disclosure A level indicator control system including a micro- processor that controls the height and, therefore, the amount of the substance, such as fluid or granular solid, to be con- tained 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 per- centage 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 func- tion of the changes in capacitance between the stationary probe and the tank wall as the level of substance approaches or sub- merges the probe. The system finds its probe capacitance and sets its own high and low control set point limits automatically. Thereafter, for example, when the substance in the tank exceeds the high limit set point value, the control system prevents more fluid or granular solid from entering the tank.
417518
Daily Donald Y.
Emplit Raymond H.
Ridout & Maybee Llp
Robertshaw Controls Company
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