Apparatus for monitoring electrical properties of a liquid

Details Apparatus for monitoring electrical properties of a liquid Apparatus for monitoring electrical properties of a liquid

1977-12-02

1979-01-02

Tokar, M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 29, G01N 2742

Patent

active

041329449

ABSTRACT:
Apparatus for monitoring the temperature, and the electrical conductance and capacitance, of a liquid product during processing of the liquid product, and automatically converting the measured electrical conductance and capacitance values to the conductance capacitance of the liquid product at a selected reference temperature of the product. An a.c. sine wave voltage is applied across a conductivity cell immersed in the liquid and an admittance signal proportional to the current flowing through the cell is resolved into a signal proportional to the conductance of the liquid, and a signal proportional to the capacitance of the liquid, within the cell. A thermocouple at the conductivity cell produces a signal proportional to the liquid temperature, which is compared with a selected reference temperature signal, and the signal proportional to the difference between the temperature signal and the reference signal is applied to temperature compensation circuits to produce respective signals proportional to the conductance and capacitance of the liquid at the selected reference temperature.

REFERENCES:
patent: 3867687 (1975-02-01), Gealt

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