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Tungsten-rhenium thermocouples _ classification and technical indexes of the instrument

by:JVTIA     2020-10-29
Tungsten-rhenium thermocouples hot wire electrode is the feature of high melting point ( 3300℃) Extremely easily, low steam and oxidation; In the oxidizing atmosphere chemistry stability is good. Electromotive force is big, high sensitivity, is main or cheap. At present, a lot of measuring temperature above 1600 ℃, the non-contact method is adopted, however, the method of error is bigger, such as contact law can accurately measure the true temperature. In high temperature thermocouple, precious metal thermocouple is expensive and high temperature can only be under 1800 ℃, and tungsten rhenium thermocouple temperature measurement not only high ceiling, and good stability, therefore, tungsten-rhenium thermocouples in metallurgy, building materials, aerospace, aviation, and nuclear power and other industries are widely used. Tungsten resources in our country, the tungsten-rhenium thermocouples cheap, can partially replace precious metal thermocouple ( Platinum rhodium thermocouple) It is promising in the area of high temperature test temperature materials. Its high temperature can reach 2800 ℃, but, when higher than 2300 ℃, scattered data, therefore, using temperature at about 2000 ℃. Tungsten-rhenium thermocouples are easily oxidized, suitable for use in dry inert or hydrogen, or with dense protection tube separate it with oxygen. Cannot be used for carbon atmosphere ( As used in the atmosphere containing hydrocarbons, a temperature over 1000 ℃ or corrosion) 。 Tungsten or tungsten rhenium easy to generate stable carbides in carbon atmosphere, so that to reduce its sensitivity and cause the brittle fracture, the presence of hydrogen, will accelerate carbonization. Tungsten-rhenium thermocouples antioxidant problems scholars at home and abroad has been a topic of concern, and dedicated to the study. Our company adopted the international advanced fabrication process, successfully developed the prefabricated tungsten-rhenium thermocouples, high temperature and pressure of the product temperature range of 0 ~ 1800 ℃, it is widely used in metallurgy, coking, chemical furnace, heat treatment, glass and other industries, it has high precision, low price, stable performance, without being limited by the working environment atmosphere, etc, is an ideal product to replace platinum rhodium thermocouple. Our company produces the tungsten-rhenium thermocouples has been widely used in many units, the performance reached the level of similar products abroad. Its technical indicators index number as follows: W - Re3/25, W - Re5/26 temperature measuring range: 0 ~ 1800 ℃ temperature measuring accuracy: time constant: p 180 s insulation resistance: > 5 m Ω size: 300500750100, 0110 ( mm) Rhenium tungsten steel rapid temperature measuring thermocouple is designed for measuring liquid steel, iron and other metal melt temperature and the design and manufacture, it has small volume, thermal response speed, high accuracy, and low price. 其技术指标如下:较高测温温度:1800℃测温精度:≤0. 30 m Ω measuring insulation resistance: 5% or greater into rate: 98% or higher response time: at present our company production of tungsten-rhenium thermocouples in three kinds of fine ceramics is a kind of protection tube, ceramic tube specifications: Ф diameter 8, 10, Ф Ф 12, 14, Ф Ф 16, 300 ~ 1100 mm in length, the thermocouple can not be restricted by working environment atmosphere in any atmosphere medium and long-term use, temperature range is 0 ~ 1800 ℃. Another kind is pure molybdenum protection tube, molybdenum and tungsten tube specifications are: Ф diameter 6, 8, Ф Ф 10 mm, 500 ~ 700 mm in length, the thermocouple in a vacuum, reduction or inert gas protection of the environment medium and long term work, molybdenum tube is under 1800 ℃ temperature use for a long time, short-term use temperature to 2000 ℃. Is a kind of tungsten protection tube, as for the tungsten tube can long-term work under 2100 ℃, but it is hard to processing and its price is very expensive.
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