What are the advantages of platinum rhodium thermocouples?

What are the consequences if the metal wires of two thermocouple materials come into contact in air? Firstly, we need to give a brief introduction to thermocouples. Thermocouples are actually temperature sensing elements and instruments. It directly measures temperature and converts the temperature signal into a thermoelectric potential signal, which is then converted into the temperature of the measured medium through electrical instruments (secondary instruments). Thermocouples, as measuring tools for thermal monitoring and testing, play an important role in practical applications.

In the current production process, detection technology and its tools are becoming increasingly important, especially in non-destructive scratching, measurement, and metrology of various products and components. Ceramic thermocouples play an indispensable role in improving quality and the economic benefits of enterprises.
The working principle of a thermocouple is that when two conductors with different compositions are connected at both ends to form a circuit, a thermoelectric potential will be generated in the circuit when the temperatures of the two junction points are different. If there is a temperature difference between the measuring end of the thermocouple (the end that senses the measured temperature is called the measuring end) and the participating end (the end at a known temperature is called the reference end or the cold end), the display instrument will show the temperature value corresponding to the thermoelectric potential generated by the thermocouple.

Platinum rhodium thermocouple is a traditional temperature measuring element with stable thermoelectric performance and strong oxidation resistance, suitable for continuous use in oxidizing and inert atmospheres. The long-term usage temperature is 1600 ℃, and the short-term usage temperature is 1800 ℃.
Advantages of Platinum Rhodium Thermocouples

Platinum rhodium thermocouples have the advantages of accuracy, stability, wide temperature measurement range, long service life, and high temperature measurement upper limit in the thermocouple series. Suitable for oxidizing and inert atmospheres, and can also be used in vacuum for a short period of time, but not suitable for reducing atmospheres or atmospheres containing metal or non-metal vapors. A significant advantage of B-type thermocouples is that they do not require compensation wires, as the thermoelectric potential is less than 3 μ V within the range of 0-50 ℃.