Circuit for monitoring the conductivity of a solution

Details Circuit for monitoring the conductivity of a solution Circuit for monitoring the conductivity of a solution

1976-01-09

1977-06-07

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

204195C, G01N 2742

Patent

active

040286185

ABSTRACT:
A circuit for monitoring the conductivity of a solution has a four probe conductivity cell which is supplied by a constant current source to provide a signal proportional to the conductivity. A thermistor is connected in the feedback circuit of an operational amplifier and responds to temperature changes in the solution to change the gain of the amplifier and maintain the circuit output at a predetermined level.

REFERENCES:
patent: 3203240 (1966-11-01), Spady
patent: 3493857 (1970-02-01), Silverman
patent: 3566233 (1971-02-01), Kahn
patent: 3657640 (1972-04-01), Jelinek
patent: 3717566 (1973-02-01), Wilson
patent: 3924175 (1975-12-01), Wilson

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