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The Basic Principle of Thermocouple Calibration
Source: | Author:Olivia | Published time: 2025-02-21 | 14 Views | Share:
The operation of thermocouples is based on the Seebeck effect. That is, a closed loop composed of two conductors of different materials will generate an electromotive force in the loop when there is a temperature difference at the two contact points, and there is a specific functional relationship between this electromotive force and the temperature difference. During the calibration process, a standard source with a known temperature, such as a high-precision thermostat, is used. The measuring end of the thermocouple is placed in a standard temperature environment, and the reference end is placed at a constant temperature (usually an ice bath to ensure a 0°C reference). By measuring the electromotive force generated by the thermocouple at this time and comparing it with the standard thermoelectric potential-temperature lookup table, the error of the thermocouple can be determined. Although this principle seems simple, the actual operation requires strict control of various conditions. From the accuracy of the standard source to the resolution of the measuring instrument, any slight change may affect the calibration result, requiring calibrators to possess excellent professional skills.