The advantages of platinum-rhodium thermocouple: The platinum-rhodium thermocouple has the advantages of high accuracy, good stability, wide temperature range, long service life, and high upper limit of temperature measurement in the thermocouple series. 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 of platinum-rhodium thermocouples: The disadvantages of platinum-rhodium thermocouples are thermoelectric potential. The thermoelectric potential rate is small, the sensitive reading is low, the mechanical strength is reduced 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 platinum-rhodium thermocouple: When a platinum-rhodium thermocouple is composed of two conductors with different components 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 (platinum) is recommended when the measured temperature is normal 1200~1600℃. Rhodium 30-platinum rhodium 6), so that the service life of platinum rhodium thermocouple can be guaranteed within the temperature range used.
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