Platinum rhodium thermocouple and the possible cause of leakage on its surface

The second-class standard thermocouple (platinum rhodium 10-platinum) is the standard thermocouple of the thermocouple calibration device, as well as the precision temperature measuring thermocouple used in the experiment. It is also used for the verification of industrial and thermocouples and precision measurement in the range of 300-1300℃ Temperature measuring device. The called standard thermocouple refers to the thermocouple whose thermoelectric power and temperature are stipulated in the national standard, the allowable error, and there is a unified standard graduation table. It has a matching display instrument for selection. It has high accuracy, good physical and chemical properties, and good oxidation resistance at high temperatures. It is widely used in electric power, thermal power, metallurgical industry, chemical industry and other industries. Platinum rhodium thermocouple is also called high temperature precious metal thermocouple. Platinum rhodium is divided into single platinum rhodium (platinum rhodium 10-platinum rhodium) and double platinum rhodium (platinum rhodium 30-platinum rhodium 6). They are used as temperature measurement sensors, usually related to temperature Transmitters, regulators and display instruments are used together to form a process control system to directly measure or control the temperature of fluid, steam, gaseous media and solid surfaces in the range of 0-1800°C during various production processes. The high temperature precious metal thermocouple is a traditional temperature measuring element with stable thermoelectric performance and strong oxidation resistance. It is suitable for continuous use in an oxidizing and inert atmosphere. The long-term use temperature is 1600°C, and the short-term use temperature is 1800°C. It is suitable for high temperature occasions in various production processes, and is widely used in temperature measurement of glass, ceramics and industrial salt bath furnaces. The positive electrode of the standard thermocouple is platinum rhodium wire, and the negative electrode is platinum wire. There is a double-hole high-temperature porcelain tube with a length of 550 mm. The standard thermocouple is stored in a glass outer tube. The surface platinum rhodium thermocouple is widely used in textile, printing and dyeing, papermaking, plastics, rubber and other fields because of its unique probe and convenient portability. As a more sophisticated instrument, he doesn't mean that there will be no problems. It will also have some failures like other products, such as leakage. This common problem may cause headaches for many manufacturers. So here I will tell you about the current leakage situation. The reasons for the leakage of surface thermocouples are: 1. The refractory bricks on the electric furnace have poor insulation at high temperatures. Inserting a surface thermocouple with a metal tube into the furnace wall with the furnace wire can easily make the furnace wire contact the surface thermocouple, and the refractory brick is in contact with the surface thermocouple. It is a good insulation disassembly at room temperature, but as the temperature rises, the insulation performance will decrease significantly. Alumina refractory bricks are mostly used for the lining of resistance electric furnaces, and the resistance value decreases significantly as the temperature rises. 2. The contact between the furnace wire and the surface thermocouple, the platinum-rhodium surface thermocouple protection tube is an alumina porcelain tube, and the couple wire is worn with a porcelain tube for separation and insulation. The insulation performance will also be reduced at high temperatures, resulting in leakage and later leakage Go to the surface thermocouple, so that there is an AC leakage signal on the surface thermocouple.

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