Differential Sensor for PH Monitoring of Environmental Objects

Abstract

Abstract. Differential pH sensor is proposed. Reference electrode and measuring electrode are the same type. Reference electrode is immersed in standard buffer solution with known pH value. The differential pH sensor has longer service life as compared with the traditionally used sensors with silver chloride reference electrode. Ultrasonic cleaning system is proposed to clean the primary measuring transducer from pollution that form as result of silting during long-term operation with the sensor.

Fabrication and Optimization of Nafion as a Protective Membrane for TiN-Based pH Sensors

“…However, despite their accuracy, great sensitivity and good reliability, pH glass electrodes are too fragile and bulky in size for them to be used as miniaturized sensors for in vivo applications [ 2 ]. In addition, glass pH electrodes decompose over time leading to a decrease in pH sensitivity [ 2 , 4 ] and the deposits on the electrode membrane can affect pH measurements. It is also very important to always store the pH glass electrodes in an aqueous solution, most usually in 3 molL −1 KCl buffer solution when not in use and perform regular maintenance [ 5 ].…”