Performance parameters, advantages and disadvantages of platinum-rhodium thermocouples

Brief introduction of platinum-rhodium thermocouples Our company produces S-type, R-type, B-type platinum-rhodium thermocouples with reliable quality and guaranteed inspection. Platinum-rhodium is a traditional temperature measuring element with stable thermoelectric function and strong oxidation resistance. The temperature for long-term use is 1600°C, and the temperature for short-term use is 1800°C. Detailed introduction of platinum-rhodium thermocouple WR series platinum-rhodium thermocouple is a traditional temperature measuring element with stable thermoelectric performance and strong oxidation resistance, suitable for continuous use in oxidative and lazy atmospheres. The temperature for long-term use is 1600°C, and the temperature for short-term use is 1800°C. The technical indicators of the paper recorder are as follows: 1. Temperature measurement scale: 0~1800°C 2. Temperature measurement accuracy: <±0.5%t3, Time constant: ≤180s 4. Insulation resistance: 5MΩ (at 20°C) 5. Standard Scale: 500, 750, 1000, 1200 (mm) WR series platinum-rhodium thermocouple, also known as high-temperature precious metal thermocouple, platinum-rhodium has single platinum-rhodium (platinum-rhodium 10-platinum-rhodium) and double platinum-rhodium (platinum-rhodium 30-platinum-rhodium) 6), as temperature measurement sensors, they are generally used in conjunction with temperature transmitters, regulators and display surfaces to form a process control system to directly measure or control the temperature in the range of 0-1800°C in various production processes. Temperatures such as fluids, vapors and gaseous media and solid surfaces. Platinum-rhodium thermocouples are precious metal thermocouples. The diameter of the even wire is specified as 0.5mm, and the allowable error is -0.015mm. The nominal chemical composition of the positive electrode (BP) is platinum-rhodium alloy, which contains 30% rhodium and 70% platinum, and the negative electrode (BN) is platinum-rhodium alloy. The amount of rhodium is 6%, so it is commonly known as double platinum-rhodium thermocouple. The maximum operating temperature of the thermocouple is 1600°C for a long time and 1800°C for a short term. Advantages: 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 oxidative and lazy atmospheres, and also for short-term use in vacuum, but not in restorative atmospheres or in metal-rich or non-metallic vapor atmospheres. A significant advantage of the B-type thermocouple is that it does not need to be compensated with a compensation wire, because the thermoelectric potential is less than 3 μV in the range of 0~50 °C. Defects: The shortcomings of platinum-rhodium thermocouples are thermoelectric potential, the thermoelectric potential rate is small, the active reading is low, the mechanical strength is reduced at high temperature, it is very sensitive to pollution, and precious metal materials are precious, so the one-time investment is large.

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