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Hot runner thermocouple J, K type difference
Oct 27, 2017

(K type thermocouple) nickel chromium - nickel silicon thermocouple

Nickel-chromium-nickel-silicon thermocouple (K-type thermocouple) is the largest amount of cheap metal thermocouple, the amount of the sum of other thermocouples. The nominal chemical composition of the positive electrode (KP) is Ni: Cr = 90: 10, the nominal chemical composition of the negative electrode (KN) is Ni: Si = 97: 3, and the working temperature is -200 ~ 1300 ℃.


K-type thermocouple has the advantages of good linearity, high thermoelectromotive force, high sensitivity, good stability and uniformity, strong oxidation resistance, low price and so on, and can be used in oxidative inert atmosphere. Widely used by users.


K-type thermocouples can not be used directly at high temperatures for sulfur, reducing or reducing, oxidizing alternating atmospheres and in vacuum, and are not recommended for use in weakly oxidized atmospheres.

K or J type thermocouple.jpg

(J type thermocouple) iron - copper nickel thermocouple

Iron-copper-nickel thermocouple (J-type thermocouple), also known as iron - Constantan thermocouple, is also a low-cost cheap metal thermocouple. The nominal chemical composition of the positive electrode (JP) is pure iron, the negative electrode (JN) is a copper-nickel alloy, often vaguely referred to as the caramel, its nominal chemical composition: 55% copper and 45% nickel and a small amount But it is very important elements of manganese, cobalt, iron and other elements, although it is called carbon, but different from the nickel-chromium - copper and copper - copper copper, it can not be replaced with EN and TN. The coverage temperature range of the iron-carban thermocouple is -200 to 1200 ° C, but the temperature range is usually 0 to 750 ° C.


J-type thermocouple with good linearity, thermoelectromotive force larger, high sensitivity, stability and uniformity is good, cheap and so on, widely used by users.


J-type thermocouples can be used in vacuum, oxidation, reduction and inert atmosphere, but the positive iron in the high temperature oxidation faster, so the use of temperature is limited, can not be directly unprotected at high temperatures for vulcanization

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