WRN assembled thermocouple is a precious metal thermocouple

WRN assembled thermocouples are still relatively widely used in the field of industrial chemical industry, especially in power plants, chemical production, high-temperature furnaces and other production. WRN assembled thermocouples are almost always used as temperature measuring elements. The proportion of other types of thermocouples is very small. All of them use reliable WRN assembled thermocouples. The main reason is that WRN assembled thermocouples have many advantages.
The advantages of WRN assembled thermocouples are accurate measurement, good temperature performance, high temperature resistance, long service life, and it can be suitable for different oxidizing and inert atmospheres. The application range and field are extremely wide. It is used as a temperature sensing element. Generally, it needs to be used in conjunction with temperature transmitters, displays and other components. As a thermal set for temperature control, WRN assembled thermocouples have a wide temperature measurement range and can measure gases, liquids, and solids in the range of 0~1800°. It can also be used for steam measurement.
The working principle of WRN assembled thermocouples is that when the two ends of two conductors of different components are connected into a loop, when the temperatures of the two junctions are 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.
WRN assembled thermocouples are divided into various models according to the different measured temperatures. When the measured temperature is normally between 1000 and 1300 °C, it is recommended to use a single WRN assembled thermocouple (platinum-rhodium 10-platinum). If the measured temperature is normally between 1200 and 1600 °C, it is recommended to use a double WRN assembled thermocouple (platinum-rhodium 30-platinum-rhodium 6). In this way, the service life of the WRN assembled thermocouple can be guaranteed within the temperature range used.
WRN assembled thermocouples are precious metal thermocouples. The wire diameter is specified as 0.5mm, with an allowable deviation of -0.015mm. The nominal chemical composition of the positive electrode (BP) is a platinum-rhodium alloy, which contains 30% rhodium and 70% platinum. The negative electrode (BN) is a platinum-rhodium alloy, which contains 6% rhodium, so it is commonly known as a double WRN assembled thermocouple. The maximum long-term operating temperature of the thermocouple is 1600℃, and the maximum short-term operating temperature is 1800℃.