Capacitance level sensor for use with viscous, electrically cond

Details Capacitance level sensor for use with viscous, electrically cond Capacitance level sensor for use with viscous, electrically cond

1983-02-16

1985-05-07

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

324 61R, 331 65, 34087016, G01F 2326, G01R 2726

Patent

active

045150150

ABSTRACT:
A level sensor for sensing the level of viscous, electrically conducting materials in a tank includes a variable capacitor, the capacitance of which varies in response to changing material level height in the tank. The variable capacitance is connected through a charging resistor to a comparator to form an astable multivibrator which develops an output signal having a period dependent partly upon the capacitance of the variable capacitor. The charging resistor has a resistance which is small with respect to the resistance of the material so that build up or coating of material on the variable capacitor has little or no effect on the measurements. The frequency of the output signal from the multivibrator is divided to derive a signal of relatively low frequency which may be coupled to a remote location by a two wire conductor.

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Linear Applications Handbook 1, National Semiconductor, Nov. 1967, p. AN31-6 ("Free-Running Multivibrator").
"Voltage Comparators", National Semiconductor LM 160 Chip, Specification Sheets, pp. 5-35 to 5-37.

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