Abstract
A system of measuring pH of a soln. having a calibration device to counteract time-drift effect. The calibration device of the system adjusts a compensation voltage to zero a measuring voltage of a 1st sensor and only respond to time-drift voltage of the 1st sensor. The calibration device has a differential operation amplifier receiving measuring voltages from the 1st sensor and a 2nd sensor of the system to eliminate the time-drift voltages of the 1st and 2nd sensors, thereby achieving calibration of the time-drift effects. [on SciFinder(R)]
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CITATION STYLE
Chou, J.-C., & Liu, C.-Hsin. (2008, March 20). pH measurement system and method for reducing time-drift effects thereof. U.S. Pat. Appl. Publ. National Yunlin University of Science and Technology, Taiwan .
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