High sensitivity conductivity detector

Details High sensitivity conductivity detector High sensitivity conductivity detector

1984-08-24

1987-06-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

324439, 324443, 324450, 34087038, 204400, 204406, G01N 2704

Patent

active

046723226

ABSTRACT:
A high sensitivity conductivity detector for ion chromatography includes an isolated fluid cell and a measuring circuit including an operational amplifier having its input connected to the center tap of a transformer. Feedback from the operational amplifier maintains the center tap at virtual ground potential. The excitation voltage for the transformer is supplied by two operational amplifiers. A thermoelectric semiconductor device maintains the temperature of the sample cell at a constant, ambient temperature.

REFERENCES:
patent: 3197697 (1965-07-01), McCauley
patent: 3421982 (1969-01-01), Schultz
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patent: 3946309 (1976-03-01), Roughton
patent: 4035719 (1977-07-01), Anderson
patent: 4066365 (1978-01-01), Staunton
patent: 4262665 (1980-12-01), Mate
patent: 4532510 (1985-07-01), Bertrand
D. T. Gjerde, J. S. Fritz, and G. Schmuckler, Anion Chromatography with Low-Conductivity Eluents, J. of Chromatography, 186 (1979) pp. 509-519.
Ion Chromatography with Conventional HPLC Instrumentation by J. E. Girard and J. E. Glatz, American Laboratory, Oct. 1981, pp. 26-35.

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