The temperature range of household thermometers is -30---100. The temperature range is small and cheap. Platinum-rhodium thermocouples are also called high-temperature precious metal thermocouples. There are single platinum rhodium (platinum rhodium 10-platinum rhodium) and double platinum rhodium (platinum rhodium 30-platinum). Rhodium 6) points, they are used as temperature measurement sensors, usually used with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control various production processes in the range of 0-1800 ℃ The temperature of fluid, steam and gas medium and solid surface. 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. Advantages: The platinum-rhodium thermocouple in the thermocouple series has 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℃. 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. The working principle of the platinum-rhodium thermocouple is that when the platinum-rhodium thermocouple is composed of two different conductors connected at both ends of the circuit, when the temperature of the two junctions is different, a thermal current will be generated in the circuit. 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
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