Implementation of a High-Precision pH Sensor

Zhan Wei Xu; Gui Lin Zheng

doi:10.4028/www.scientific.net/AMM.373-375.358

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 373-375Implementation of a High-Precision pH Sensor

Implementation of a High-Precision pH Sensor

Abstract:

A high-precision pH sensor based on electrochemical principle is proposed in the paper. The principle of the sensor, the performance parameters of MCU, hardware architecture and experiment are introduced. The NEC microprocessor, which is low-power and high stability, is adopted as core processor. The three operational amplifiers same-phase parallel amplifying circuit not only matches the impendence of the pH combination electrode, but also eliminates the impact of wire resistance on pH measurement. The system's capacity of resisting disturbance is improved. Using 18-bit AD converter, which has programmable amplifier on chip, improves measurement accuracy. Both theoretical analysis and experimental results show the effectiveness of the pH sensor. A full description of the pH sensor and implementation are presented.

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Periodical:

Applied Mechanics and Materials (Volumes 373-375)

Pages:

358-362

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.373-375.358

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Online since:

August 2013

Authors:

Zhan Wei Xu, Gui Lin Zheng

Keywords:

Electrochemical, NEC Microcomputer, pH Combination Electrode, pH Sensor

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