K, E type thermocouple how to distinguish?

K type thermocouple and E type thermocouple in industry or a lot, because they are cheap. But E type thermocouple in the low-temperature measurement accuracy is higher than the K type thermocouple, K type thermocouple used in high temperature period.

K type thermocouple temperature measurement range of 0 - 1000 ℃, it thermoelectric potential big, high sensitivity good linearity, uniform on the display instrument calibration, in terms of oxidation resistance is superior to the other connection metal thermocouple, although low temperature measurement precision, and can satisfy the use requirement in the industry, so in industrial use. K type thermocouple is highly magnetic, negative magnetic, a little kiss at temperature of 100 ℃ the millivolt signal is 4. 096 mv。

E type thermocouple temperature measurement range of 0 - 700 ℃, E type thermocouple stability is good, often used in high precision low temperature and oxidation and inert atmosphere thermoelectric potential is large, and its positive electrode material is nickel chrome material and K type thermocouple as the anode, negative copper nickel alloy. The positive color is dark green, E type thermocouple negative extremely bright yellow, the millivolt signal at 100 ℃ is 6. 319mV。

so be the difference between K type thermocouple and E type thermocouple in the absence of nameplate, method is to look at the electrode color, color is E type thermocouple or not, * * is measured under the temperature of 100 ℃ or directly measuring millivolt millivolt signal in normal temperature, usually E type thermocouple thermoelectric potential higher than K type thermocouple, the millivolt signal is E type thermocouple.