The working principle and advantages and disadvantages of platinum rhodium thermocouple

The platinum-rhodium thermocouple is a traditional temperature measuring element, which has 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. The temperature of fluid, steam, gas medium and solid surface within the range of 0-1800℃. 1. The working principle of platinum-rhodium thermocouple: The working principle of platinum-rhodium thermocouple is that the platinum-rhodium thermocouple is composed of two conductors with different components. Generate thermal current. If there is a temperature difference between the working end of the thermocouple and the reference end, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. The choice of platinum rhodium thermocouple: It is recommended to use single platinum rhodium thermocouple (platinum rhodium 10-platinum) when the measured temperature is normal at 1000~1300℃, and double platinum rhodium thermocouple is recommended when the measured temperature is normal at 1200~1600℃ ( Platinum rhodium 30-platinum rhodium 6), so that the service life of the platinum rhodium thermocouple can be guaranteed within the used temperature range. The platinum rhodium thermocouple is a precious metal thermocouple. The diameter of the couple 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 rhodium content is 6%, so it is commonly called double platinum rhodium thermocouple. The thermocouple has a high long-term use temperature of 1600°C, and a short-term high use temperature of 1800°C. 2. Advantages and disadvantages of platinum-rhodium thermocouples: 1. Advantages: platinum-rhodium thermocouples in the thermocouple series have the advantages of high accuracy, good stability, wide temperature measurement range, long service life, and high temperature measurement upper limit. It is suitable for oxidizing and inert atmospheres, and also for short-term use in vacuum, but not suitable for reducing atmospheres or atmospheres containing metal or non-metal vapors. An obvious advantage of B-type thermocouple is that it does not need compensation wire for compensation, because the thermoelectric potential is less than 3μV in the range of 0~50℃. 2. Disadvantages: The disadvantage of platinum-rhodium thermocouples is the thermoelectric potential. The thermoelectric potential rate is small, the sensitive reading is low, the mechanical strength decreases at high temperature, and it is very sensitive to pollution. The precious metal materials are expensive, so the one-time investment is relatively large.

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