Moving into the higher temperature realms of industrial usage, ceramic insulators are available in various forms. Porcelain ceramic twin bore beads can be used on base metal thermocouple wires of about 1mm and beyond. Meanwhile, aluminum silicate (Mullite) insulators are frequently used with Type K thermocouple wires, particularly in furnace type applications - whether the sensor is unprotected or housed in metal or ceramic outer sheaths/tubes. As for platinum-based thermocouples, high purity alumina twin bore insulators are generally favoured to reduce the risk of contamination.
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