Different types of thermocouples are made of different materials

Along with the continuous development of science and technology, the industry is in rapid progress, for using the tool as demand is higher and higher, as you know, the temperature of the thermocouple is a kind of common detector, with high measurement precision and function character such as safe, thermocouple are mostly made from pure metal materials, the application is more platinum and copper, Nickel, manganese and rhodium materials are also developed for thermocouples. It can not only be widely used in industrial temperature measurement, and is made into a standard reference instrument. But there are different principles for different thermocouples to choose their manufacturing materials. Next, xiaobian will explain to you how to correctly select manufacturing materials for different thermocouples:

1. The resistance value of raw materials used to make thermocouples should be approximately linear with the temperature.

2. Manufacture thermocouple to choose a larger resistivity. The higher the resistivity, the smaller the volume of the thermocouple, the smaller the thermal capacity and thermal inertia, and the faster the response to temperature changes.

3. Choose the manufacturing materials of thermocouple to be more reproducible to ensure that the thermocouple can be applied accurately.

4. The selection of thermocouple should be within the temperature measurement scale, with stable chemical and physical functions.

5 for the manufacture of thermocouple temperature coefficient should be as large as possible. As the temperature coefficient of resistance is defined as the relative change of resistance when the temperature increases by 1T (Kelvin), the greater the temperature coefficient of resistance, the higher the sensitivity of the thermometer, the more accurate the measurement results.

6. But in fact, the current thermocouple raw materials can be roughly divided into metal thermocouples and thermistors. The metal thermocouples are mainly platinum and copper. The common models of industrial thermocouples are Cu100, Pt100, Pt10, Cu50 and so on.

In short, if you want to make the thermocouple can be used accurately, it is necessary to select manufacturing materials according to the above points, and the measurement scale and accuracy of different thermocouples are different.