About pH : Temperature compensation electrode
In pH measurement, there is a correlation between pH and electromotive force, and the slope is theoretically determined. For example, 58.17mV at 20°C, 59.15mV at 25°C, and 60.15mV at 30°C. Therefore, in pH measurement, the slope between 1pH must be corrected to one that is at that temperature and used. This operation is called temperature compensation.
There are two methods of temperature compensation: one is to manually compensate the temperature, and the other is to automatically compensate the temperature by recognizing the theoretical slope from the temperature with a built-in thermometer. This temperature sensor is called a temperature compensation electrode, and a method for automatically performing temperature compensation by measuring the temperature is called automatic temperature compensation (ATC). In the current pH measurement, a temperature compensation electrode is built-in, and the most method is to automatically compensate for the temperature.