An overview of the working principle and advantages and disadvantages of platinum-rhodium thermocouples

Platinum-rhodium thermocouple is a traditional temperature measuring element with the characteristics of stable thermoelectric performance and strong oxidation resistance. It is usually used in conjunction with temperature transmitters, regulators and display instruments to directly measure or control various production processes. Temperatures such as fluids, steam and gaseous media and solid surfaces in the range of 0-1800°C. The working principle of the platinum-rhodium thermocouple is that when the platinum-rhodium thermocouple is connected by two conductors of different compositions into a loop, when the temperature of the two junctions is different, a thermal current will be generated in the loop. If there is a temperature difference between the working end and the reference end of the thermocouple, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. Selection of platinum-rhodium thermocouple: When the measured temperature is normally 1000~1300℃, it is recommended to use a single platinum-rhodium thermocouple (platinum-rhodium 10-platinum), and when the measured temperature is normally 1200~1600℃, it is recommended to use a double platinum-rhodium thermocouple ( Platinum-rhodium 30-platinum-rhodium 6), so that the service life of platinum-rhodium thermocouples can be guaranteed within the temperature range used. Platinum-rhodium thermocouples are precious metal thermocouples. The diameter of the even wire is specified as 0.5mm, and the allowable deviation is -0.015mm. The nominal chemical composition of the positive electrode (BP) is platinum-rhodium alloy, which contains 30% rhodium and 70% platinum, and the negative electrode (BN) is platinum-rhodium alloy. The amount of rhodium is 6%, so it is commonly known as double platinum-rhodium thermocouple. The long-term high use temperature of the thermocouple is 1600°C, and the short-term high use temperature is 1800°C.

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