How to distinguish between t-type and k-type thermocouples

1. The basic principle of thermocouples
A thermocouple is a sensor used to measure temperature, which converts temperature into a voltage signal using the thermoelectric effect. The basic principle is that two different materials of wires form a circuit loop through the welding point. When there is a temperature difference between the two ends of the welding point, a thermoelectric potential is generated, resulting in a small voltage signal.
2. T-type thermocouple
The T-type thermocouple is composed of two materials: copper and copper nickel alloy. The relationship between the voltage signal and temperature difference between them is very linear. It is suitable for measuring temperatures as low as -200 degrees Celsius and has good oxidation and corrosion resistance.
3. K-type thermocouple
The K-type thermocouple is composed of nickel chromium alloy and nickel aluminum alloy. Compared with T-type thermocouples, K-type thermocouples have a wider temperature measurement range, ranging from -270 ° C to 1300 ° C. In addition, K-type thermocouples also have high sensitivity and long-term stability.
4. Methods for distinguishing between T-type and K-type thermocouples
The two wires of the T-type thermocouple are marked in red and blue, while the K-type thermocouple is marked in red.
The T-type thermocouple is suitable for temperature measurement from -200 ° C to 350 ° C, while the K-type thermocouple has a wider temperature range, up to -270 ° C to 1300 ° C.
T-type thermocouples have lower temperature sensitivity, while K-type thermocouples have higher temperature sensitivity.
T-type and K-type thermocouples are common temperature sensors that differ in material composition, temperature range, and temperature sensitivity. By observing color markings, understanding temperature range and sensitivity, we can effectively distinguish between T-type and K-type thermocouples, and select temperature sensors that are suitable for our needs