Tungsten-rhenium
thermocouple is a kind of high-temperature resistant thermocouple. It features good linear relationship between temperature and thermoelectric potential, reliable thermal stability and cost-effectiveness. Matched with display instruments, it can directly measure the temperature of liquid, steam and gas media.
It can partially replace platinum-rhodium thermocouples for ultra-high temperature measurement in high-end metallurgical industry, high-temperature electronic thermoelectric system structural engineering, space vehicles and nuclear reactors.
The temperature-thermoelectric potential relationship of tungsten-rhenium thermocouples conforms to the calibration table ZBN05003—88, equivalent to ASTM E696—84 standard.
The outer protection tube of tungsten-rhenium
thermocouple adopts high-purity corundum tube, recrystallized silicon carbide tube, molybdenum tube or tantalum tube. The tube is filled with high-temperature insulating material, vacuumized and then sealed at the cold end to ensure no residual oxygen inside the tube. The product is suitable for use in vacuum, reducing atmosphere and inert gas, while its service life is relatively short in oxidizing atmosphere.
Operating Environmental Conditions
Ambient air temperature: 20±15℃
Relative humidity: no more than 85%
Insulation resistance between thermoelectrode and outer protection tube: greater than 100 MΩ·m
Selection of Outer Protection Tubes for Tungsten-Rhenium Thermocouples
High-purity Corundum Tube (Al₂O₃)Suitable for use in oxidizing atmosphere below 1600℃.
Recrystallized Silicon Carbide Tube (SiC)Suitable for use in oxidizing atmosphere below 1600℃.
Molybdenum Tube (Mo)For vacuum service below 2300℃ (supplied by special agreement).
Tantalum Tube (Ta)For vacuum service below 2300℃ (supplied by special agreement).
zack@yuanheating.com 
+086 18961983512
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E-Mail: zack@yuanheating.com
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