Marsh Bellofram Thermo-Couple Products Division Thermowells Protection Tubes - Marsh Bellofram - #1

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Introduction to Ceramic and Silicon Carbide Protection Tubes In applications where contamination from hostile environments is a factor; the use of ceramic and silicon carbide protection tubes is recommended. Hostile conditions can also exceed the melting points of common metals and require the use of noble metal thermocouples (platinum and its alloys). Traditionally, such assemblies include one or two inner porcelain tubes and one outer silicon carbide tube. Protection Tube Selection Protection tubes must be selected based on the intended application and the maximum temperatures expected. Tube materials react differently to high temperatures. At elevated temperatures certain ceramic materials pass through a glass phase. Alumina protection tubes and element insulators are recommended for applications with temperatures exceeding 2400°F (1316°C) Glazed tubes are not recommended for any application involving noble metals www.tcproducts.com a division of Marsh Bellofram www.marshbellofram.com 1-800-727-5646 Thermo-Couple Products Co. 81