Refractory Thermocouples High accurate Refractory Thermocouples for variety of application Type G, C, D (operating temperature upto 2300ºC) Sheath Material Platinum Rhodium, Tantalum, Rhenium, Molybdenum, Inconel 600, Ceramic etc. Sheath Dia 1.6, 3.2, 6.4, 8.0 mm Standard Transition Sleeve SS316 or INCONEL Insulation Material Magnesium Oxide, Aluminium Oxide, Beryllium Oxide, Hafnium Oxide