Performance characteristics and precautions for use of platinum rhodium thermocouple

Platinum-rhodium thermocouple is a relatively traditional temperature measuring element. Because of its stable thermoelectric performance and strong anti-oxidation performance, it is very suitable for continuous use in an inert or oxidizing atmosphere. If it is a long-term If it is used, its temperature should be kept above 1600℃, and if it is used for short-term use, the temperature should also be kept above 1800℃. In addition, platinum rhodium thermocouples can also be used as temperature measuring sensors. Under normal circumstances, they are often used in conjunction with temperature transmitters, regulators and other display instruments, and form a control system with each other. , Can directly measure and control the fluid, gas, steam and other media between 0℃-1800℃. The precautions for using platinum-rhodium thermocouples are as follows: 1. When selecting the platinum-rhodium thermocouple compensation wire, it is very important to choose the model, especially the self-polarity must not be connected incorrectly, and The temperature of the connecting end between the compensation wire and the thermocouple must never exceed 100°C; 2. If a platinum rhodium thermocouple with a relatively large time constant is used, when temperature control or temperature measurement is performed at the same time, On the display of the instrument, although the temperature will fluctuate slightly, the fluctuation of the furnace temperature is actually very large. In order to measure the temperature more accurately, a platinum rhodium thermocouple with a relatively small constant should be selected; 3. According to Wiring diagram of platinum-rhodium thermocouple on the meter, connect the device and energize the device, then the meter will display the graduation number of the thermocouple, followed by the range range of the meter, and then the temperature will be adjusted according to the display on the digital tube of the meter Set it, then the measured temperature will be displayed on the upper row of digital tubes; Fourth, platinum rhodium thermocouples cannot be directly installed on the measured medium, or in areas with relatively little flow. If platinum is used If the measuring tube in the rhodium thermocouple measures the temperature of the gas, it must be installed in the reverse flow direction and maintain sufficient contact with the gas.

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