Platinum rhodium thermocouple is also called high temperature precious metal thermocouple. Platinum rhodium can be divided into single platinum rhodium (Platinum Rhodium 10 platinum rhodium) and double platinum rhodium (platinum rhodium 30 platinum rhodium 6). As temperature measurement sensors, they are usually used together with temperature transmitter, regulator and display instrument, The process control system is composed to directly measure or control the temperature of fluid, steam, gas medium and solid surface in the range of 0-1700 ℃.