Nickel chromium and nickel chromium iron alloy are the most widely used high resistance electric heating alloys. This alloy has high resistivity, good oxidation resistance and wear resistance, good machining performance and welding performance, and high strength at high temperatures. The alloy is suitable for manufacturing heating elements, voltage regulating resistors and braking resistors of various motors in metallurgy, chemical industry, machinery, glass, ceramics, household appliances and other industrial sectors.
Copper copper nickel thermocouple (T-type thermocouple), also known as copper constantan thermocouple, is the best low temperature low metal thermocouple. Its positive pole (TP) is pure copper, and its negative pole (TN) is copper nickel alloy, often called constantan. It is common with the EN of nickel chromium constantan and cannot be common with the JN of iron constantan, although they are all called constantan. The measuring temperature range of copper copper nickel thermocouple is - 200~350 ℃.
Iron copper nickel thermocouple (J-type thermocouple) is also called iron constantan thermocouple. The nominal chemical composition of its positive pole (JP) is pure iron, and the negative pole (JN) is copper nickel alloy, which is often vaguely called constantan. Its nominal chemical composition is 55% copper, 45% nickel, and a small amount of very important cobalt, iron, manganese and other elements. Although it is called constantan, it is different from nickel chromium constantan and copper constantan, so it cannot be replaced by EN or TN. The temperature range covered by iron constantan thermocouple is - 210~1200 ℃, but the commonly used temperature range is 0-750 ℃.
The nickel chromium silicon nickel silicon magnesium thermocouple (N-type thermocouple) is a low metal thermocouple, which is the latest internationally standardized thermocouple. The nominal chemical composition of the positive pole (NP) is: Ni: Cr: Si ≈ 84.4:14.2:1.4, and the nominal chemical composition of the negative pole (NN) is: Ni: Si: Mg ≈ 95.5:4.4:0.1. Its use temperature range is - 200~1300 ℃.
Nickel chromium copper nickel thermocouple (E-type thermocouple), also known as nickel chromium constantan thermocouple, is also a kind of low metal thermocouple. Its positive electrode (EP) is nickel chromium 10 alloy with the same chemical composition as KP. The negative electrode (EN) is copper nickel alloy. Its nominal chemical composition is 55% copper, 45% nickel and a small amount of cobalt, manganese, iron and other elements. The use temperature of the thermocouple is - 200~900 ℃.
Nickel chromium nickel silicon thermocouple (K-type thermocouple) is the low metal thermocouple with the largest usage in the temperature measurement area above 500 ℃, and its usage is the sum of other metal thermocouples. The nominal chemical composition of the positive pole (KP) is Ni: Cr ≈ 90:10, and the chemical composition of the negative pole (KN) is Ni: Si ≈ 97:3, and its operating temperature range is - 200~1300 ℃.