In order to solve problems of traditional on-line pH monitoring instrument such as short transmission distance

measuring signal is susceptible to interference and reliability of temperature compensation is poor

a new integrated and packaged pH sensor is designed and measuring principle

structure design and measurement and control design circuit are introduced.According to relevant standard

several experiments have been conducted to verify performance of sensor

which response time is 10 s

maximum drift is 0.04 pH and precision of temperature compensation is 0.03 pH.Experimental results show that the sensor has quick response

good measurement stability

high temperature compensation reliability

especially suit for pH value measurement in the fields of water environment monitoring and water pollution control.