Product name: WRR-130B platinum rhodium thermocouple
Number of products: 113722-365
Product model: WRR-130
Manufacturer: [Thermocouple, Thermocouple]-Shanghai Feilong Instrument & Electrical Co., Ltd.
Product details Platinum and rhodium thermocouples are precious metal thermocouples. The diameter of the wire is specified as 0.5mm and the tolerance is -0.015mm. The nominal chemical composition of the positive electrode is platinum-rhodium alloy, which contains 30% rhodium, 70% platinum, and the negative electrode is platinum-rhodium alloy, which contains 6% , So commonly known as double platinum rhodium thermocouple. The long-term maximum use temperature of this thermocouple is 1600 ℃, and the short-term maximum use temperature is 1800 ℃.
Advantages of platinum rhodium thermocouple
Platinum and rhodium thermocouples have the highest accuracy, the best stability in the thermocouple series, a wide temperature range, a long service life, and a high temperature limit. It is suitable for oxidizing and inert gases, and can also be used in vacuum for a short time, but it is not suitable for reducing gases or gas containing metal or non-metal vapor. An obvious 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 3μV in the range of 0 ~ 50 ° C.
Disadvantages: The shortcomings of platinum and rhodium thermocouples are thermoelectric potential, small thermoelectric rate, low sensitivity, reduced mechanical strength at high temperatures, very sensitive to pollution, expensive precious metal materials, and therefore a large one-time investment. (Slow response)
The working principle of platinum rhodium thermocouple is that when two ends of a conductor with two different compositions are connected to a circuit, when the temperature of the two junctions is different, a thermal current will be generated in the circuit. 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.
Selection of platinum-rhodium thermocouple: It is recommended to use a single platinum-rhodium thermocouple (platinum-rhodium 10-platinum) when the measured temperature is normally 1000 ~ 1300 ℃, and it is recommended to use a double platinum-rhodium thermocouple (1 Platinum rhodium 30-platinum rhodium 6), so that the service life of the platinum rhodium thermocouple can be guaranteed in the temperature range used.