Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1978-04-26
1981-04-14
Strecker, Gerard R.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324442, G01R 2722, G01N 2706
Patent
active
042622530
ABSTRACT:
A circuit is provided for producing an electrical output signal representative of the conductivity of a sample of fluid in a chromatograph sample cell. A constant A.C. current source is connected to one of the electrodes in the conductivity cell and a change in the resistivity of the cell is measured to produce an A.C. signal which is then conditioned by a signal conditioner. The signal conditioner scales the AC signal and converts it to a D.C. signal representing the resistivity of the conductivity cell. The resistivity signal is supplied to dividing means which is operable for inverting the resistivity signal to provide a signal representative of the conductivity of the sample fluid. Conductivity values can be detected in both the sample conductivity cell and a reference conductivity cell to provide conductivity signals for both the sample cell and the reference cell. These conductivity signals can be used for inputs into a difference amplifier to provide a signal representative of the difference between the two conductivity signals and its sign.
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Lawrence, James F., Journal of Chromatography, vol. 128, No. 1, Nov. 17, 1976, pp. 154-156.
Optichrom TM/LC System, Applied Automation Catalog.
Phillips Petroleum Company
Strecker Gerard R.
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