GB/T 18404-2022 Mineral-Insulated Thermocouple Cables and Thermocouples

Overview

GB/T 18404-2022 specifies the classification, technical requirements, test methods, inspection rules, marking and packaging of mineral-insulated thermocouple cable and the thermocouples made from it. It is the reference national standard for designing, manufacturing and accepting MI thermocouples.

Key Points

Scope. MI cable — conductors, mineral insulation and metal sheath assembled as one cable — and both assembled and MI thermocouples made from it.
Classification. By calibration type, number of conductors (single or double), sheath diameter series and junction form (insulated, exposed or grounded).
Technical requirements. Tolerance by type and temperature range, insulation resistance at room and elevated temperature, and sheath materials with their upper temperature limits.

Summary

This is the standard to quote when specifying an MI thermocouple: it fixes the tolerance, the insulation-resistance criterion and the sheath diameter series in one place.

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