K type thermocouple overviewK-type thermocouple is also commonly referred to as the nickel-chromium/ nickel-silicon thermocouple. Chinese thermocouple factory often call it WRN thermoocuple. It is a type industrial temperature sensor that can measure high temperature at low price cost. K type thermocouple probe is one of the most widely used thermocouples in industrial automation control.
A K-type thermocouple is a subtype of base metal category. The metals of this thermocouple are nickel-chromium or nickel-alum. the nominal chemical composition is: Ni: Cr = 90: 10, and the anode material is nickel-silicon alloy, the nominal chemical composition is: Ni: Si = 97: 3. It is one of the most commonly used thermocouples with cheap cost, greater accuracy and reliability, and a wide operating temperature range. This range lies between -200 ℃ and 1000 ℃. Because nickel-chromium/nickel-silicon alloy has good high-temperature oxidation resistance, it can be used in oxidizing or neutral media. Therefore, this K-type thermocouple can measure a high temperature of 1000 ° C for a long time and 1200 ° C in a short time. The average accuracy is almost 75% whereas the risk factors for any error are only 0.4%. This gives it better reliability with a low cost of the metals thus K type thermocouple is used commonly in industries and homes.
However, k type thermocouple cannot be used in fluids with reducing property; otherwise, it will be corroded and damaged quickly. Although its measurement accuracy is slightly lower, it can fully meet the requirements of industrial temperature measurement,
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