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There are two kinds of expensive tungsten-rhenium thermocouples listed in the national standard in China
2012-3-13 8:17:03

。 1. Classified expensive tungsten-rhenium thermocouple . There are two kinds of expensive tungsten-rhenium thermocouples listed in the national standard in China: thorium, tungsten phenium5-tungstenphenium26, whose active name contains ingredients, phenium tungsten 95% minus 5%, element names 74%, and 26% tungsten rhenium. Number of divisions wre5-wre26, abbreviation: w-re5 / 26. Rhenium B, the expensive tungsten rhenium 3-tungstenphenium25, whose active name contains ingredients, phenium tungsten 97% minus 3%, elemental names 75%, and 25% tungsten rhenium. Number of divisions wre3-wre25, abbreviation: w-re3 / 25. Rhenium tungsten thorium thermocouples use expensive 2. Now more than 1600 ℃ temperature measurement, more contact methods are used, but the method has a large error. If the contact method can be used to accurately detect the actual temperature. 在冶金,建材,航天,航空、核电等行业得到广泛的应用。 In high-temperature thermocouples, precious metal thermocouples are expensive and the highest temperature is only 1800 ° C. Tungsten-rhenium thermocouples have temperature limitations and are not only high, but also stable. Therefore, expensive tungsten-rhenium thermocouples are used in metallurgy and building materials , Aerospace, aviation, nuclear power and other industries have been widely used. China has abundant tungsten resources. Tungsten-rhenium thermocouples are expensive and inexpensive, and can replace a part of precious metal thermocouples. It is a good temperature measurement material for testing in high temperature fields. 3, using temperature. Its maximum operating temperature can reach 2800 ° C, but above 2300 ° C, the data is scattered. Therefore, the best use temperature is around 2000 ° C. 4. Use ambient atmosphere. Tungsten-rhenium thermocouples are expensive and easily oxidized. They are suitable for use in dry inert gas or hydrogen, or with a protective tube with a density to isolate them from oxygen. Do not use a carbon atmosphere (such as atmospheric hydrocarbons above 1000 ° C, the temperature from corrosion). Tungsten or tungsten thorium produces stable carbon in the atmosphere by expensive carbon dioxide, so reducing sensitivity and causing brittle fracture, the presence of hydrogen will accelerate carbonization. 5, phenium thermocouple tungsten oxide. The temperature range of the product is 0 ~ 1800 ° C. It is widely used in metallurgy, coking, chemical industry furnaces, heat treatment, glass, etc. It has high accuracy, low price, stable performance, and does not limit the working environment atmosphere. Ideal for thermocouples.

分3种,一种是精细陶瓷保护管,另一种是纯钼保护管,又是一个钨保护管。 The performance indicators are as follows: 1, divided by the number of people: w-re3 / 25/26, w-re52, temperature measurement range: 0 ~ 1800 ° C3, temperature measurement accuracy: <± 1% ton-0.5% ton; <4, time Constant: frequency 180, insulation resistance:> 5 mΩ6, size: 300 500 750 1000 1100 (mm) Special attention. At present, there are three types of tungsten-rhenium thermocouples produced by our company, one is a fine ceramic protection tube, the other is pure Molybdenum protection tube is another tungsten protection tube. Specifications of tube ceramics: diameter 8ФФФ, 10, 12, ФФ 14, 16, 300 ~ length is 1100 mm, the working environment of this type of thermocouple, any restricted atmosphere for long-term use, the temperature measurement range is 0 ~ 1800 ℃; Tungsten molybdenum pipe and tube specifications: diameter ФФ6, 8, Ф10 mm, length 500 ~ 700 mm, this type of thermocouple can only protect the environment under vacuum or inert gas, reducing long-term work, the best molybdenum tube is at 1800 ℃ Under long-term use, the short-term use temperature is 2000 ° C; as for tungsten tubes, there can be long-term work at 2100 ° C, but it is difficult to handle if the price is very expensive. Please choose the thermocouple that suits you according to the parameters