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Vol. 26, Special Issue, March 2014, pp. 92-100

 

Bullet

 

Design of the Smart pH Sensor Based on Ion Selection Electrode
 

Xuelun Hu, * Yaoguang Wei, Yingyi Chen, Chunhong Liu

College of Information and Electrical Engineering, China Agricultural University? Beijing 100083, China
Tel.: +86-10-62736764, fax: +86-10-62737741

E-mail: weiyaoguang@gmail.com

 

Received: 19 November 2013 /Accepted: 27 December 2013 /Published: 14 March 2014

Digital Sensors and Sensor Sysstems

 

Abstract: In aquaculture pH is one of the important indicators which affect cultivation objects’ healthy growth, whether pH value is normal or not would affect the survival of cultured objects. The traditional pH detecting method has poor stability and reliability, a smart pH sensor which is based on ion selective electrode has been designed in this paper, it adopts positive and negative double power to solve the problem of power supply, the self-excited prevented and impedance matching circuit has been designed to eliminate the self-excited oscillation circuit's influence on the measurement accuracy. The filter circuit has been designed to prevent the interference of the power frequency noise signal effectively, the zero and range adjustment circuit has been designed to expand the scope of the sensor. The temperature compensation correction model has been proposed to solve the problem of temperature compensation. The experiment results have shown that the developed sensor has good stability, reliability, and suitable for pH monitoring in aquaculture water quality.

 

Keywords: pH, Ion selective electrode, Water quality testing.

 

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