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Methods and Steps of Thermocouple Calibration
Source: | Author:Olivia | Published time: 2025-02-21 | 14 Views | Share:
Common thermocouple calibration methods include the comparison method and the fixed-point method. The comparison method is the most commonly used. Firstly, prepare a standard thermocouple and the thermocouple to be calibrated. Place their measuring ends together in a calibration furnace with precisely controllable temperature, and handle the reference ends according to the standard requirements. Gradually change the temperature inside the furnace from low to high. At each set temperature point, use a high-precision voltmeter to measure the thermoelectric potentials generated by the two thermocouples, record and compare the differences, and correct the thermocouple to be calibrated according to the differences. The fixed-point method is suitable for high-precision calibration. Fixed temperature points such as the triple point of water (0.01°C) and the freezing point of zinc (419.527°C) are selected as calibration benchmarks. Place the thermocouple in the corresponding devices at these points, measure the thermoelectric potential and calibrate. Regardless of the method, the operation steps must be rigorous: before calibration, ensure that the thermocouple has no external damage and clean the measuring end; during calibration, control the temperature stably and measure accurately; after calibration, properly preserve the calibration records to provide a basis for subsequent traceability.