Q&A on Thermocouples and Compensation Wires: What are the unavoidable errors of K-type thermocouples?
A: I will answer questions about the unavoidable error of K thermocouples (Short Range Ordering: SRO)!
When a K thermocouple is used for a certain period in the temperature range of 250°C to 550°C and then subjected to temperature inspection and calibration, there may be a significant error on the positive side. What is the cause and countermeasure for this? A: When a K thermocouple is exposed to a temperature range of approximately 250°C to 550°C, the thermoelectric power of the exposed part gradually increases, resulting in a phenomenon where it indicates a temperature several degrees higher than the actual temperature by changing the insertion length. This effect recovers to its original state when the temperature exceeds about 650°C. This temperature range may vary slightly according to the literature. It becomes particularly evident when the actual insertion depth differs from the insertion depth during calibration. If the insertion length is not changed to a shorter length, significant changes will not occur. *For more details, please refer to the PDF document or feel free to contact us.*
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