K-type thermocouple is currently the most widely used low-cost metal temperature sensor, based on the principle of thermoelectric effect. It consists of a nickel chromium (Ni: Cr=90:10) positive electrode and a nickel silicon (Ni: Si=97:3) negative electrode, with a temperature measurement range covering -200 ℃ to 1370 ℃, which can meet the temperature measurement needs of the vast majority of industrial scenarios and scientific research experiments. With excellent performance and high cost-effectiveness, its market usage far exceeds the sum of other types of thermocouples.
1、 Product Overview
K-type thermocouple is currently the most widely used low-cost metal temperature sensor, based on the principle of thermoelectric effect. It consists of a nickel chromium (Ni: Cr=90:10) positive electrode and a nickel silicon (Ni: Si=97:3) negative electrode, with a temperature measurement range covering -200 ℃ to 1370 ℃, which can meet the temperature measurement needs of the vast majority of industrial scenarios and scientific research experiments. With excellent performance and high cost-effectiveness, its market usage far exceeds the sum of other types of thermocouples.
2、 Core advantages
Wide temperature range adaptation: It can work stably from ultra-low temperature environments to high temperature scenarios of 1370 ℃. Whether it is steelmaking furnaces in the metallurgical industry or ultra-low temperature tests in the laboratory, it can accurately capture temperature changes.
Excellent performance: It has the characteristics of good linearity, large thermoelectric potential, and high sensitivity. The correspondence between temperature and thermoelectric potential is more linear, and the data reading accuracy is high; Strong antioxidant properties and can maintain stable performance even after long-term use in oxidizing or inert atmospheres.
High cost-effectiveness: Compared to precious metal thermocouples, K-type thermocouples have lower costs, but their performance is sufficient to meet most conventional temperature measurement needs. They also have a longer service life in harsh environments, greatly reducing users' temperature measurement costs.
3、 Technical parameters
Thermal inertia level: divided into three levels: I (time constant 90-180 seconds), II (30-90 seconds), and III (10-30 seconds), which can be selected according to the temperature response speed requirements.
Insulation resistance: The insulation resistance between the hot electrode and the protective tube, as well as between the two hot electrodes at high temperatures (measured per meter), shall not be less than 72000 Ω at 600 ℃, 25000 Ω at 800 ℃, and 5000 Ω at 1000 ℃.
Minimum insertion depth: should not be less than 8-10 times the outer diameter of the protective sleeve (except for special products) to ensure temperature measurement accuracy.
4、 Precautions
K-type thermocouples are not suitable for sulfur-containing, vacuum or reducing atmosphere environments, and can only be used in oxidizing and neutral media above 500 ℃. In addition, since the thermocouple calibration table is based on the cold end 0 ℃ calibration, it is necessary to perform cold end compensation in practical use to avoid measurement errors caused by temperature fluctuations at the cold end.
