Technique for the measurement of high purity water

Details Technique for the measurement of high purity water Technique for the measurement of high purity water

G - Physics

01

N

324/26, 324/27

G01N 27/06 (2006.01) G01N 27/48 (2006.01) G01N 33/18 (2006.01) G01R 27/22 (2006.01)

Patent

CA 1266299

ABSTRACT OF THE DISCLOSURE Improved accuracy in solution conductivity or resistivity measurement 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.

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