Boots – shoes – and leggings
Patent
1983-09-30
1986-05-20
Krass, Errol A.
Boots, shoes, and leggings
73304C, 364562, G01F 2326
Patent
active
045905754
ABSTRACT:
A dielectric compensated level indicator control system including a microprocessor that controls the height and therefore the amount of a substance, such as fluid or granular solid, to be contained in a closed or open tank or vessel. The system has a measurement probe whose capacitance is a function of the level of substance in the tank and a reference probe whose capacitance is a function only of the dielectric constant of the substance. The appropriate zero capacitance is subtracted from each probe capacitance and a ratio between the resulting difference capacitances is determined. This ratio is independent of the dielectric constant of the substance and represents the percent fullness of the tank. When substances with different dielectric constants are placed in the vessel no span recalibration of the probe is required. A single transmitter is used to transmit along a single transmission channel a single signal which represents the capacitance of both probes. When received, this signal is separated into two time interval signals, one representing each probe.
REFERENCES:
patent: 4083248 (1978-04-01), Maier
patent: 4199984 (1980-04-01), Huddart et al.
patent: 4275382 (1981-06-01), Jannotta
patent: 4383444 (1983-05-01), Beaman et al.
patent: 4485673 (1984-12-01), Stern
Cosimano Edward R.
Krass Errol A.
Robertshaw Controls Company
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