Firstly, in terms of material composition, J - type thermocouple wire consists of an iron - constantan combination. The iron acts as the positive leg, while the constantan (a copper - nickel alloy) serves as the negative leg. In contrast, K - type thermocouple wire is made of a chromel - alumel combination. Chromel, which is mainly composed of nickel and chromium, is the positive leg, and alumel, a nickel - aluminum - manganese - silicon alloy, is the negative leg. This difference in material leads to variations in their performance characteristics.

Secondly, the temperature ranges they can measure vary significantly. J - type thermocouples can typically measure temperatures from - 210°C to 760°C. They are well - suited for a variety of applications with moderate temperature requirements. For instance, in the food processing industry, J - type thermocouples are commonly used in baking ovens. When baking bread, the temperature inside the oven usually ranges from 150°C to 250°C. Our high - quality J - type thermocouple wires can accurately monitor these temperatures, ensuring that the bread is baked evenly and achieves the perfect texture. Another application is in pharmaceutical manufacturing, where J - type thermocouples are used to measure the temperature during the drying process of certain drugs. The temperature in this process is often kept within 50°C to 70°C, and our J - type thermocouple wire products can provide reliable temperature data, safeguarding the quality of the drugs.

K - type thermocouples, on the other hand, have a wider temperature range, from - 200°C to 1350°C. This makes them indispensable in high - temperature applications. In the steel - making industry, K - type thermocouples are used to monitor the temperature inside the blast furnace. Temperatures in a blast furnace can reach up to 1200°C or even higher. Our K - type thermocouple wires can withstand such extreme heat while maintaining high accuracy, allowing operators to precisely control the smelting process and ensure the quality of the steel. In the field of aerospace, during the testing of jet engine components, K - type thermocouples are used to measure the high - temperature gases generated during engine operation. These gases can reach temperatures close to 1300°C, and our K - type thermocouple wire products can provide accurate temperature readings, which are essential for the development and optimization of jet engines.

Accuracy is another key aspect. K - type thermocouples generally offer better accuracy over a wide temperature range compared to J - type thermocouples. The stability of K - type thermocouples in harsh environments also contributes to their higher precision, making them a preferred choice for scientific research and high - precision industrial processes.

At Tankii, our J and K thermocouple wire products are manufactured with strict quality control. Our J - type thermocouple wires ensure reliable performance within their specified temperature range, while our K - type thermocouple wires are designed to withstand high temperatures with excellent accuracy and stability. Whether you need to measure low - temperature refrigeration processes or high - temperature industrial reactions, our thermocouple wire products can provide you with accurate and stable temperature data, helping you optimize your operations and ensure product quality.