The selection method of thermocouples

Select based on collection temperature

Thermocouples can be divided into the following 8 types based on the combination of two types of metal conductors.

B/R/S thermocouples are called precious metal thermocouples, while N/K/E/J/T thermocouples are called cheap metal thermocouples.
Precious metal thermocouples containing metals with higher melting points such as platinum and rhodium are used to collect temperatures above+1000 ° C, while inexpensive metal thermocouples are commonly used to collect temperatures below+1000 ° C.

The following describes the characteristics of various types of thermocouples.
Due to its higher rhodium content compared to other precious metal thermocouples, B thermocouples have an increased melting point and mechanical strength, resulting in a longer service life. The electromotive force is extremely low, making it impossible to collect low-temperature areas. Mainly used for collecting areas with higher temperatures that R/S thermocouples cannot collect.
R/S thermocouples are also used in high-temperature areas where durability is a certain requirement. The usage rate of R thermocouple in precious metal thermocouples is extremely high.
The N thermocouple is inexpensive and is used to collect high temperature areas above+1000 ℃.
Compared to precious metal thermocouples, K thermocouples are cheaper and more commonly used in industrial applications. Due to its good linearity of electromotive force, high heat and corrosion resistance, the use of K thermocouples can be prioritized.
The E thermocouple has a high electromotive force every 1 ℃, making it a type with good resolution. Specially used for precise temperature collection.
J thermocouple is a type second to E thermocouple, with a larger electromotive force per 1 ℃ and excellent resolution. One of its major features is that the price is lower than that of the E thermocouple.
T thermocouples are excellent types of electromotive force characteristics in low-temperature regions (-200 to+300 ℃). Used for precise collection of low-temperature areas.