Technique of compensating for capacitive effects in conductivity

Details Technique of compensating for capacitive effects in conductivity Technique of compensating for capacitive effects in conductivity

1986-09-03

1989-02-28

Envall, Jr., Roy N.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

324441, 324439, 204406, G01N 2748, G01R 2722

Patent

active

048089303

ABSTRACT:
Improved accuracy in solution conductivity or resistivity measurment uses a center-sampling technique in which an AC drive is applied to a conductivity cell and the conductivity cell voltage is sampled during a predetermined time interval in the center of a half cycle drive waveform. The effects of cell capacitance, and particularly the electrode-solution capacitive, are compensated by periodically sampling during a second time interval which is different from the first interval. Based upon the difference between the sampled voltages in the first and second intervals, a correction to the measured conductivity or resistivity is made to compensate for capacitance induced errors.

REFERENCES:
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patent: 4132944 (1979-01-01), Bentz
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patent: 4656427 (1987-04-01), Dauphinee
patent: 4682113 (1987-07-01), Barben
patent: 4683435 (1987-07-01), Blades
Van Norstrand's Scientific Encyclopedia, Sixth Edition, "Integrating-Ramp A/D Converter."
"Journal of Chemical Education", Braunstein et al., vol. 48, No. 1, Jan. 1971, pp. 52-59.

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