Temperature Influences

Both the pH/redox value of the sample and the characteristics of the electrode are temperature dependent. Usually, the temperature dependency of the sample is unknown. Therefore, it is important to always record the measurement temperature together with the measured value. The automatic temperature compensation of the measurement devices can only compensate for the temperature dependence of the electrode’s characteristics curve (Nernst-Gleichung). For this purpose, temperature sensors (for example, Pt1000 or NTC 30 kohm) are used. In order to obtain the most accurate measurement, the electrode should always be calibrated at the same temperature at which measurements will later take place. For measurements that will serve as a comparison between laboratory and process values, make sure that the laboratory measurement takes place at the same temperature as the process measurement.