K-type thermocouple is a kind of temperature sensor. K-type thermocouple is usually used with display instrument, recording instrument and electronic regulator. K-type thermocouple is usually composed of main components such as temperature sensing element, installation fixture and junction box.
K-type thermocouple is used as a kind of temperature sensor. K-type thermocouple is usually used with display instruments, recording instruments and electronic regulators. The K-type thermocouple can directly measure the surface temperature of liquid vapor, gaseous media and solids in various production ranges from 0℃ to 1300℃.
K-type thermocouple is the cheapest metal thermocouple with the largest consumption 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 its operating temperature is -200℃~1300℃.
K-type thermocouple has the advantages of good linearity, large thermoelectromotive force, high sensitivity, good stability and uniformity, strong oxidation resistance, and low price. It can be used in oxidizing inert atmosphere and widely used by users.
K-type thermocouples cannot be used directly in sulfur, reducing or reducing, oxidizing alternate atmospheres and vacuum at high temperatures, nor are they recommended for use in weakly oxidizing atmospheres.
Measuring range of k-type thermocouple
The K-type thermocouple material is mainly composed of nickel-chromium-nickel-silicon alloy. The nominal chemical composition of the positive electrode (KP) is: Ni:Cr=90:10, and the nominal chemical composition of the negative electrode (KN) is: Ni:Si=97 : 3. It is a thermocouple with high cost performance that can measure higher temperature, and it is the most commonly used thermocouple in industrial automation control. Because Ni-Cr-Ni-Si alloy has good high temperature oxidation resistance, it can be used in oxidizing or neutral media. Therefore, the K-type thermocouple can measure a high temperature of 1000 degrees for a long time and 1200 degrees for a short time. However, it cannot be used in reducing media, otherwise, it will quickly corrode and damage. In this case, it can only be used for measurements below 500 degrees. It is much cheaper than the S-type thermocouple, its repeatability is good, the thermoelectric potential generated is large, so the sensitivity is high, and its linearity is good. Although its measurement accuracy is slightly lower, it can fully meet the requirements of industrial temperature measurement, so it is the most commonly used thermocouple in the industry.