Durex Industries manufactures high-temperature platinum element thermocouples for temperatures in excess of 3000°F. Various protection designs include the use of ceramic, metal, ceramic metal and refractory materials. Two typical designs include the use of a primary tube for protection or the platinum element along with a secondary protection tube to prevent thermo-shock or contamination. Platinum thermocouples with protection tubes are mounted with fixed fitting or flanges designed for the application.