System and method for measuring conductivity of fluid
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United States of America Patent
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Jun 23, 2009
Grant Date -
Dec 4, 2008
app pub date -
May 29, 2007
filing date -
May 29, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and related method are provided to calibrate for wire capacitance during use to minimize error in conductivity measurement of the target fluid. The system includes a signal generator configured to drive the conductivity cell and the temperature element, with an alternating current (AC) drive signal having variable parameter. The system further includes a processor assembly electrically coupled to the conductivity cell and the temperature element to calculate a conductivity value of the fluid. The conductivity value is a function of the values of the temperature measurement, the compensation measurement, and the raw conductivity measurement, thereby compensating the conductivity value for capacitance effects. In this manner, the system effectively compensates for capacitance attributable to wiring extending between the electrode and other electronics of the sensor, usable with wiring of varied and unknown lengths.
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