Platinum-rhodium thermocouples can be divided into single-platinum-rhodium thermocouples and double-platinum-rhodium thermocouples. First, a brief introduction to single-platinum-rhodium thermocouples, its full name is platinum-rhodium 10-platinum thermocouples (also referred to as S-type thermocouples, in which the positive electrode contains rhodium 10%, containing 90% platinum, the negative electrode is pure platinum) platinum and rhodium are both precious metals, so platinum-rhodium thermocouples are also commonly known as precious metal thermocouples. It consists of three parts, a protection tube, an inner core, and platinum-rhodium wire. There are many kinds of protection tubes, such as high-temperature stainless steel, corundum, silicon carbide, etc. The appropriate protection tube is selected according to the different working conditions on site, and the diameter of the platinum-rhodium wire The specification is 0.5mm, and the allowable deviation is -0.015mm. The thermocouple can be used at a temperature of 1300 °C for a long time, and a short-term use temperature of 1600 °C. Platinum-rhodium thermocouple has the advantages of high accuracy, good stability, wide temperature measurement area and long service life in the thermocouple series. It has good physical and chemical properties, thermoelectric potential stability and good oxidation resistance at high temperature, and is suitable for oxidizing and inert atmospheres. Due to the excellent comprehensive performance of the S-type thermocouple, the S-type thermocouple that conforms to the international temperature scale has been used as an interpolation instrument for the international temperature scale for a long time. Although 'ITS-90' stipulates that it will no longer be used as an internal inspection instrument for the international temperature scale However, the International Committee on Temperature (CCT) believes that the S-type thermocouple can still be used to approximate the international temperature scale.
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