It is mainly adjusted flexibly in accordance with national metrological standards, industry specifications and application scenarios. The specific provisions are as follows:
1. National metrological standards: According to JJF 1098 - 2003, the re-calibration interval for standard thermocouples such as Type S shall not exceed 1 year; GB/T 16839 - 1997 clearly stipulates that the calibration cycle for working thermocouples is usually no more than 1 year.
2. Industry-specific specifications: In the aerospace field, per AMS2750E/F standards, Type Ⅰ thermocouples shall be calibrated once every 12 months, and Type Ⅱ once every 3 - 6 months; Version 4 of CQI - 9 in the automotive industry requires mandatory calibration of thermocouples before first use-base metal types must be replaced after 1 year of use at ≥760℃, and 2 years in low-temperature environments; in fields such as nuclear power and pharmaceuticals, the calibration cycle is often no more than 3 months.
3. General references for different scenarios: For conventional industrial scenarios (e.g., ordinary ovens), calibration shall be performed once every 6 - 12 months; for high-precision scenarios (e.g., laboratories, food and pharmaceutical production), calibration is required every 3 - 6 months; for harsh environments such as high temperature (>1000℃) and strong corrosion, the calibration interval shall be shortened to 1 - 3 months. In addition, thermocouples that are newly installed, repaired, used beyond the range, or subjected to mechanical collision shall be calibrated in advance, and the calibration interval is recommended to be shortened for the subsequent 1 - 2 cycles.