Platinum-rhodium wire is a platinum-based rhodium-containing binary alloy, which is a continuous solid solution at high temperature. Rhodium increases the thermoelectric potential, oxidation resistance and acid corrosion resistance of the alloy to platinum. There are alloys such as PtRh5, PtRhl0, PtRhl3, PtRh30 and PtRh40. Alloys with more than 20% Rh are insoluble in aqua regia. Mainly used as thermocouple materials, including PtRhl0/Pt, PtRh13/Pt, etc., used as thermocouple wires in thermocouples, to directly measure or control fluids, steam and gases in the range of 0-1800 ℃ in various production processes temperature of medium and solid surface.
Advantages: Platinum rhodium wire has the advantages of the highest accuracy, the best stability, wide temperature measurement area, long service life and high temperature measurement upper limit in the thermocouple series. It is suitable for oxidizing and inert atmospheres, and can also be used in vacuum for a short time, but it is not suitable for reducing atmospheres or atmospheres containing metal or non-metal vapors. .
Industrial thermocouples include platinum-rhodium wire B type, S type, R type, platinum-rhodium thermocouple, also known as high-temperature precious metal thermocouple, platinum-rhodium has single platinum-rhodium (platinum-rhodium 10-platinum-rhodium) and double platinum-rhodium (platinum-rhodium). Rhodium 30-Platinum Rhodium 6), they are used as temperature measurement sensors, usually used in conjunction with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control 0- Temperatures such as fluids, vapors and gaseous media and solid surfaces in the range of 1800°C.
The industries used are: steel, power generation, petroleum, chemical industry, glass fiber, food, glass, pharmaceutical, ceramics, non-ferrous metals, heat treatment, aerospace, powder metallurgy, carbon, coking, printing and dyeing and other almost all industrial fields.