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Introduction to the application and advantages of platinum-rhodium thermocouples

by:JVTIA     2022-02-26
The platinum-rhodium thermocouple has the advantages of the highest accuracy, the best stability, wide temperature measurement area, long service life and high temperature measurement upper limit among the thermocouple series. It is suitable for use in oxidizing and inert atmospheres, and can also be used in vacuum for a short period of time, but it is not suitable for reducing atmospheres or atmospheres containing metal or non-metal vapors. An obvious advantage of type B thermocouple is that it does not need compensation wire, because the thermoelectric potential is less than 3μV in the range of 0~50℃. The reading is low, the mechanical strength decreases at high temperature, it is very sensitive to pollution, and the precious metal material is expensive, so the one-time investment is large. 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.
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