As temperature measurement sensors, platinum rhodium thermocouple
s are often used in conjunction with temperature transmitters, regulators and display instruments to form process control systems to directly measure or control fluids in the 0-180°C range in various production processes. As steam, gaseous media and solid surfaces. Platinum-rhodium thermocouples work on the principle that when two ends of a conductor with two different components are connected to a circuit, a thermal current will flow in the circuit when the two junction temperatures are different. If there is a temperature difference between the working end and the reference end of the thermocouple, the display meter will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. When the measured temperature is usually 1000 ~ 1300 ℃, it is recommended to use a single platinum rhodium thermocouple (platinum rhodium 10-platinum), when the temperature is 1000 ℃, it is recommended to use a double platinum rhodium thermocouple (platinum). The measured temperature is the normal 1200 ~ 1600 ℃. rhodium 30 - platinum rhodium 6), so the service life of platinum rhodium thermocouples can be guaranteed within the temperature range used. Platinum-rhodium thermocouples have the advantages of high accuracy, good stability, wide temperature range, long service life and high temperature extremes in the thermocouple series. It is suitable for oxidizing and inert atmospheres, and also for short-term use in vacuum, but not for reducing atmospheres or atmospheres containing metallic or non-metallic vapors. A distinct advantage of Type B thermocouples is that no compensation wire is required for compensation, as the thermoelectric potential is less than 3µV in the 0-50°C range.
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