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These constructions are designed to operate in applications to withstand continuous temperatures as high as 1600°F (871°C). Refrasil® has been used as high as 2325°F (1274°C) when not subjected to flexing or abrasion. Refrasil® is being used under conditions where beaded ceramic or sheathed thermocouples previously were necessary.
Refrasil® is produced in an environment designed to reduce impurities so often found in silica fiber insulation. It is further tested for impurities prior to being applied to the wire (ore jacket). Thus virtually eliminating the possibility of a reaction with the chromel® leg occasionally experienced with competitive products of this type.
Refrasil® is flexible and less expensive than ceramic, however, since saturant is not used, it is not recommended for abrasive applications without a metal overbraid covering.
The Refrasil® product contains a white vitreous silica fiber braid over each conductor and as a jacket over the parallel pair. It is available in three different constructions to meet the rigors of a variety of applications. Each design is also available with an optional red tracer to identify the negative leg for ease of installation. The dye used is inorganic and contains no salts. It will fade at use temperatures.
For detailed information on the various thermocouple types, insulation properties, gauge sizes, and wire weights see our Technical Data catalog.
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