How many types of thermocouple?
So then we come to understand how many commonly used thermocouple degree?
Thermocouple in the production is an indispensable temperature measurement tools, but many types of thermocouple, the type of thermocouple and sub-degree number listed for the majority of users reference.
1, thermocouple indexing number are mainly S, R, B, N, K, E, J, T, WE and several other. Which is S, R, B belongs to the precious metal thermocouple, N, K, E, J, T are cheap metal thermocouple, S sub-degree is characterized by strong antioxidant performance, should be oxidized, inert atmosphere for continuous use, long-term The use of temperature 1400 ℃, short-term 1600 ℃. In all thermocouples, the S scale has the highest level of accuracy and is commonly used as a standard thermocouple;
2, R indexing number and S sub-degree compared to the thermal electromotive force about 15%, other performance is almost the same;
3, B sub-degree at room temperature thermoelectromotive force is very small, so the measurement is generally not compensation wire. Its long-term use temperature is 1600 ℃, short-term 1800 ℃. Can be used in oxidizing or neutral atmosphere, but also in short-term use under vacuum conditions.
4, N sub-degree is characterized by high temperature oxidation resistance at 1300 ℃, long-term stability of the thermoelectromotive force and short-term thermal cycle of good reproducibility, resistance to nuclear radiation and low temperature performance Ye Hao, you can partially replace S points Degree thermocouple;
5, K sub-degree is characterized by strong antioxidant properties, should be in the oxidizing, inert atmosphere for continuous use, long-term use temperature of 1000 ℃, short-term 1200 ℃. The most widely used in all thermocouples;
6, E sub-degree is characterized by commonly used thermocouple, the maximum thermoelectromotive force, that is, the highest sensitivity. Should be used in the oxidizing, inert atmosphere, the use of temperature 0-800 ℃;
7, J sub-degree is characterized by both for the oxidizing atmosphere (the use of the upper temperature of 750 ℃), can also be used for reducing atmosphere (the use of the upper temperature of 950 ℃), and resistance to H2 and CO gas corrosion, and more for refining and chemical ;
8, T sub-degree is characterized by all the cheap metal thermocouple in the highest degree of accuracy, usually used to measure the temperature below 300 ℃
In general, these are the Chinese market, there are like: tungsten rhenium thermocouple, R model thermocouple should have as many as 13 kinds.
