For uses at high temperatures or in hostile environments, thermocouples store away for protection in a metallic tube called a sheath, packed with dry insulation material to secure the thermocouple wires and to ensure electrical isolation. Grounded junction thermocouples are also more susceptible to open circuit failure with thermal cycling. In fact, to ensure a fast response time we make some grounded junction thermocouples by bending and welding the wires to the inside wall of the sheath rather than to the tip.
The versatile thermocouple Thermocouples are small, convenient, ﬂexible, cover wide ranges, reasonably stable, reproducible, accurate, fast
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