Tungsten-rhenium thermocouples fast 
 Product Code: 002010011503 
 Model: W-Re 3 - tungsten rhenium 25 KW-602 
 Product Note: Thermocouple order by agreement 
 Category: → fast thermocouple thermocouple 

 First, the tungsten rhenium thermocouples Esther of: 
 The melting point of tungsten-rhenium thermocouple wire: for 3120-3360 ℃, the highest you can use to 3000 ℃, it is the most high-temperature metal thermocouples. It has a high thermoelectric power, high sensitivity, does not dissolve in any acid-independent, abundant raw materials in China, low cost advantages. 
 Second, the product standard number: 
 1, JB/T9496-99 tungsten-rhenium thermocouple extension wire. 
 2, JB/T9497-99 tungsten-rhenium thermocouple wire and the indexing table (equivalent to using the U.S. ASTME696-84) standard. 
 3, JJG576-88 tungsten-rhenium thermocouples with a work verification procedures. 
 4, JB/T5401-91 rapid temperature measurement of molten steel with tungsten rhenium thermocouple wire. 
 5, JB/T5402-91 rapid temperature measurement of molten steel with tungsten rhenium thermocouple wire, thermal electromotive force test method. 
 Third, product names and sub-degree No.: 
 1, Name: W-Re 3 - tungsten rhenium 25; tungsten rhenium 5-- tungsten rhenium 26. 
 2, sub-degree No.: WRe3-WRe25 (D type); WRe5-WRe26 (C type). 
 Fourth, the product grade, size, temperature range, tolerance: 
 Grade Operating temperature tolerance 
 Special 0.1 1400-1800 ℃ ≤ ± 0.128% t 
 Ⅰ 0.1,0.25,0.5 1200-1800 ℃ ≤ ± 0.25% t 
 Ⅱ 0.1,0.25,0.5 1200-1800 ℃ ≤ ± 0.50% t 
 Ⅲ 0.25,0.5 400-2300 ℃ ≤ ± 1% t 

 Fifth, tungsten rhenium thermocouple wire insulation materials: 
 1, high purity alumina (AL2O3) can be used at less than 1800 ℃. 
 2, yttrium oxide (YO2) can be used at less than 2000 ℃. 
 3, beryllium oxide (BeO) at 2100 ℃ or less used, but toxic beryllium high-temperature steam. 
 4, thorium oxide (ThO2) in 2300 ℃ or less used, but a weak prevention of radioactive thorium. 
 Sixth, tungsten rhenium thermocouple protection tube outside the wire: 
 1, tantalum tube (Ta) at 2480 ℃ within the vacuum used. 
 2, the molybdenum tube (Mo) at 2300 ℃ within a vacuum and inert atmospheres of hydrogen. 
 Molybdenum disilicide tube (Mosi2) or molybdenum silicide coating tube surface within the air at 1600 ℃ and make some long-term corrosion-mediated