Tungsten rhenium thermocouple

Product description:

Tungsten-rhenium thermocouple is a high temperature resistant thermocouple. It has the advantages of good linear relationship between temperature and potential, reliable thermal stability, and low price. Matched with display instruments, it can directly measure the temperature of liquid, steam and gas media. It can partially replace platinum-rhodium thermocouples as ultra-high temperature measurement tools in high-tech metallurgical industry, high-temperature electronic thermoelectric system structural engineering and space launch vehicles, and nuclear reactors.

Product features:

The characteristics of the tungsten-rhenium thermocouple are: the hot electrode wire has a high melting point (3300°C), low vapor pressure, and is easily oxidized; it is chemically stable in a non-oxidizing atmosphere Good sex. The electromotive force is large, the sensitivity is high, and the main reason is that it is cheap.

1. Classification of tungsten-rhenium thermocouples. There are two types of tungsten-rhenium thermocouples listed in the national standards in my country:

A. Tungsten-rhenium 5-tungsten-rhenium 26. The nominal composition of its positive electrode is 95% tungsten and 5% rhenium, and the nominal composition of the negative electrode is Contains 74% tungsten and 26% rhenium. The graduation numbers are WRe5-WRe26, abbreviation: W-Re5/26.

B. Tungsten-Rhenium 3-Tungsten-Rhenium 25, the nominal composition of its positive electrode is 97% tungsten and 3% rhenium, and the nominal composition of the negative electrode is 75% tungsten and 25% rhenium. The graduation number is WRe3-WRe25, abbreviation: W-Re3/25.

2. Use of tungsten-rhenium thermocouple. At present, the non-contact method is mostly used to measure temperatures above 1600°C. However, this method has a large error. If the contact method is used, the true temperature can be measured accurately. Among high-temperature thermocouples, precious metal thermocouples are expensive and can only operate below 1800°C, while tungsten-rhenium thermocouples not only have a high upper limit of temperature measurement, but also have good stability. Therefore, tungsten-rhenium thermocouples are widely used in metallurgy, building materials, aerospace, and aviation. and nuclear energy and other industries have been widely used. my country is rich in tungsten resources. Tungsten-rhenium thermocouples are cheap and can partially replace precious metal thermocouples. They are promising temperature measurement materials in the field of high-temperature testing.

3. Operating temperature. Its operating temperature can reach 2800°C. However, when the temperature is higher than 2300°C, the data is scattered. Therefore, the suitable use temperature is around 2000°C.

4. Use the environment atmosphere. Tungsten-rhenium thermocouples are easily oxidized and are suitable for use in inert or dry hydrogen, or they can be used in isolation from oxygen with a dense protective tube. It cannot be used in carbon-containing atmospheres (if used in an atmosphere containing hydrocarbons, it will be corroded if the temperature exceeds 1000°C). Tungsten or tungsten-rhenium easily generates stable carbides in a carbon-containing atmosphere, which reduces its sensitivity and causes brittle fracture. In the presence of hydrogen, carbonization will be accelerated.

5. Tungsten-rhenium thermocouple resists oxidation. This problem has always been a topic of concern to scholars at home and abroad, and they are committed to research and solution. Our company has adopted international advanced manufacturing technology and successfully developed an assembled high-temperatureHigh-voltage W-Re thermocouple. The temperature measurement range of this product is 0~1800℃. It is widely used in metallurgy, coking, chemical kilns, heat treatment, glass and other industries. It has high precision, low price, stable performance and is not subject to work. With the advantages of limited environmental atmosphere, it is an ideal product to replace platinum and rhodium thermocouples. The W-Re thermocouples produced by our company have been widely used in Zhuzhou Cemented Carbide Factory, Zigong Cemented Carbide Factory, Shenyang Zhongkeyi and other units, and their performance has reached the level of similar foreign products.

The technical indicators are as follows:

1. Graduation number: W-Re3/25, W-Re5/26

2. Temperature measurement range: 0~ 1800℃

3. Temperature measurement accuracy: < ± 1% t; < ± 0.5% t

4. Time constant: ≥180 s

5. Insulation resistance: > 5MΩ

6. Specifications and sizes: 300, 500, 750, 1000, 1100 (mm)

Tungsten-rhenium molten steel rapid temperature measurement thermocouple is specially designed for measuring molten steel, It is designed and manufactured according to the temperature of molten iron and other metal melts. It has the advantages of fast response speed, high accuracy and low price.

The technical indicators are as follows:

1. Temperature measurement temperature: 1800℃

2. Temperature measurement accuracy: ≤ 0.5% t

3. Insulation resistance: ≥30 MΩ

4. Measurement yield: ≥98%

5. Response time: < 5 s