E-type thermocouple: nickel chromium copper nickel thermocouple

E-type thermocouple: nickel chromium copper nickel thermocouple

E-type thermocouple specifications: also known as nickel chromium constantan thermocouple, it is a type of inexpensive metal thermocouple. The positive electrode (EP) is made of nickel chromium 10 alloy, with the same chemical composition as KP. The negative electrode (EN) is made of copper nickel alloy, with a nominal chemical composition of 55% copper, 45% nickel, and small amounts of manganese, cobalt, iron, and other elements. The operating temperature of this thermocouple is -200~900 degree .

The thermal advantages of E-type thermocouples include high electromotive force and sensitivity, which are among the highest among all thermocouples. They are suitable for making thermoelectric stacks to measure small temperature changes. Not very sensitive to corrosion in high humidity atmospheres, suitable for use in environments with high humidity. E thermocouples also have advantages such as good stability, better oxidation resistance than copper constantan and iron constantan thermocouples, and low cost. They can be used in oxidizing and inert atmospheres and are widely adopted by users.

Insufficient E-type thermocouples: cannot be directly used for sulfur at high temperatures, in reducing atmospheres, and have poor thermoelectric potential uniformity.

T-type thermocouple: Copper copper nickel thermocouple

Specification of T-type thermocouple: also known as copper constantan thermocouple, it is also the best thermocouple for measuring low temperature of cheap metals. Its positive electrode (TP) is pure copper, and its negative electrode (TN) is made of copper nickel alloy, commonly known as constantan. It is compatible with the constantan EN of nickel chromium constantan, but not with the constantan JN of iron constantan, although they are all called constantan. The temperature range measured by the cover of copper nickel thermocouples is -200~350 degree .

Advantages of T-type thermocouples: They have advantages such as good linearity, large thermoelectric electromotive force, high sensitivity, good stability and uniformity, and low price. They are especially used in the temperature range of -200~0 degree , with better stability and annual stability less than ± 3% μ V. After low-temperature calibration, it can be used as a second-class standard for transmitting low-temperature values.

Insufficient T-type thermocouples: The positive electrode copper has poor oxidation resistance at high temperatures, so the upper temperature limit for use is limited.

J-type thermocouple: iron copper nickel thermocouple

Specification of J-type thermocouple: also known as iron constantan thermocouple, it is a low-cost low-cost low-cost metal thermocouple. The nominal chemical composition of its positive electrode (JP) is pure iron, and the negative electrode (JN) is a copper nickel alloy, often vaguely referred to as constantan. Its nominal chemical composition is 55% copper and 45% nickel, as well as small but important elements such as manganese, cobalt, and iron. Although it is called constantan, it is different from constantan in nickel chromium constantan and copper constantan, so it cannot be replaced by EN and TN. The coverage measurement temperature range of iron constantan thermocouples is -200~1200 degree , but the commonly used temperature range is 0~750 degree

Advantages of J-type thermocouples: They have advantages such as good linearity, large thermoelectric electromotive force, high sensitivity, good stability and uniformity, and low price, and are widely used by users.