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K-type thermocouple
As a kind of temperature sensor, K-type thermocouple is usually used with display instrument, recording instrument and electronic regulator. K-type thermocouple can directly measure the surface temperature of liquid vapor, gas medium and solid in the range of 0 ℃ to 1300 ℃. K-type thermocouple is the most widely used base metal thermocouple at present, and its consumption is the sum of other thermocouples. The diameter of K-type thermocouple wire is generally 1.2mm-4.0mm. 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 service temperature is - 200 ℃ ~ 1300 ℃. K-type thermocouple has the advantages of good linearity, large thermoelectric potential, high sensitivity, good stability and uniformity, strong oxidation resistance, low price, etc. it can be widely used by users in oxidizing inert atmosphere. K-type thermocouples can not be directly used in the atmosphere of sulfur, reducibility or reduction, oxidation alternation and vacuum at high temperature, and are not recommended for weak oxidation atmosphere.
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