Tungsten rhenium thermocouple

W - Rhenium thermocouple is high temperature resistant thermocouple. It has the advantages of good linear relation between temperature and electric potential, reliable thermal stability and cheap price. Matching with display instrument, it can directly measure the temperature of liquid, steam and gas medium. It can partially replace the platinum-rhodium thermocouple as a high and new metallurgical industry, high temperature electronic thermoelectric system structural engineering and space vehicle, nuclear reactor ultra-high temperature measurement tool. The relationship between tungsten-Rhenium thermocouple thermoelectric potential and temperature conforms to the ZBN05003 -- 88 indicator, which is the same as ASTME 696-84 standard. In vacuum, reduction, inert atmosphere, can be used in the range of 0 ~ 2300℃. Tungsten rhenium pair with special protective tube can also be used in 1600℃ oxidation atmosphere for a long time, its price is lower than platinum-rhodium thermocouple

Tungsten-rhenium thermocouple is characterized by high melting point (3300℃), low vapor pressure and easy oxidation. Good chemical stability in non - oxidizing atmosphere. Electromotive force is big, sensitivity is high, the most important still is price is cheap.

At present, the non-contact method is mostly used to measure the temperature above 1600℃. However, the error of this method is relatively large. For example, the real temperature can be accurately measured by the contact law. In high temperature thermocouple, precious metal thermocouple is expensive and the highest temperature can only be below 1800℃, while tungsten-Rhenium thermocouple not only has high temperature upper limit, but also good stability, therefore, Tungsten-Rhenium thermocouple is widely used in metallurgy, building materials, aerospace, aviation and nuclear energy and other industries. China is rich in tungsten resources, tungsten rhenium thermocouple price is cheap, can partially replace the precious metal thermocouple (platinum and rhodium thermocouple), it is a high temperature testing field has a very promising temperature measuring material. Its maximum operating temperature can be up to 2800 ° C, however, at higher than 2300 ° C, the data are scattered. Therefore, the best use temperature in 2000℃ or so.

Tungsten Rhenium thermocouples are easily oxidized and are suitable for use in inert or dry hydrogen gas, or when isolated from oxygen by dense protective tubes. Should not be used in carbonaceous atmospheres (if used in atmospheres containing hydrocarbons, corrosion will occur if the temperature exceeds 1000℃). Tungsten or tungsten-rhenium tends to produce stable carbides in a carbon-containing atmosphere, which reduces its sensitivity and causes brittle fracture, accelerating carbonization in the presence of hydrogen.

The problem of tungsten-Rhenium thermocouple oxidation resistance has always been the concern of scholars at home and abroad, and committed to the research and solution. 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. Tungsten-rhenium thermocouple produced by our company has been widely used in many units, and its performance has reached the level of similar products abroad. Its technical indicators are as follows:

1. Grading: W-RE3/25, W-RE5/26

2. Temperature measurement range: 0 ~ 1800℃

3. Temperature measurement accuracy: < ± 1%t; (plus or minus 0.5% t

4. Time constant: ≥180 s

5, insulation resistance: > 5 m Ω

6. Size: 300,500,750,1000,1100 (mm)

Tungsten rhenium molten steel rapid temperature measuring thermocouple is specially designed for measuring the temperature of molten steel, molten iron and other metals. It has the advantages of small volume, fast thermal response, high accuracy and low price. The technical indicators are as follows:

1. Maximum temperature measurement: 1800℃

2. Temperature measurement accuracy :≤ 0.5%

3, insulation resistance: Ω 30 M or higher

4. Measurement success rate :≥98%

5. Reaction time: < 5 s

At present, tungsten-Rhenium thermocouples produced by our company are divided into three categories:

One is the use of fine ceramic protective tube. Of the specifications of the ceramic tube are: Ф diameter 8, 10, Ф Ф 12, 14, Ф Ф 16, 300 ~ 1100 mm in length, this kind of 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 environment of long-term work, molybdenum tube is the best long-term use under the temperature under 1800 ℃, short-term use temperature to 2000 ℃;

Another type is the tungsten protective tube. Tungsten tubes can work for a long time at 2100℃, but are difficult to process, making them very expensive.

Please select the thermocouple suitable for you according to our parameters.