Continuous action capacitive moisture measuring apparatus

Details Continuous action capacitive moisture measuring apparatus Continuous action capacitive moisture measuring apparatus

1978-11-13

1981-03-31

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

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324 61QL, 73 73, G01R 2726

Patent

active

042596327

ABSTRACT:
Capacitive moisture measuring apparatus for continuously measuring the moisture content of granular material, such as grain, includes a series circuit including a measuring capacitor whose capacitance varies as a function of moisture content of granular material in which it is immersed during operation and a resistor coupled to the measuring capacitor, and an oscillator for generating a voltage signal of stable frequency and amplitude which is applied to the circuit. An operational amplifier is serially coupled to a diode to constitute an ideal diode, the latter being coupled across the measuring capacitor.

REFERENCES:
patent: 3508435 (1970-04-01), Ivy
patent: 3626286 (1971-12-01), Rauchwerger
patent: 3641431 (1972-02-01), Pigage et al.
patent: 3651505 (1972-03-01), Schmidt
patent: 4013065 (1977-03-01), Copeland et al.
patent: 4122708 (1978-10-01), Maier

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