The platinum-rhodium thermocouple
is a commonly used type in thermocouple sensors. The platinum-rhodium thermocouple has a wide range of applications and has its own irreplaceable advantages. Below, I will introduce the precautions for the use of the platinum-rhodium thermocouple. The platinum rhodium thermocouple can directly measure the temperature, and convert the temperature signal into a thermoelectromotive force signal, which is converted into the temperature of the measured medium through an electrical instrument (secondary instrument). The installation methods of platinum and rhodium thermocouples
include threaded connection, flange connection and welding. The applicable occasions and requirements are different, mainly based on pressure, temperature and other parameters. (1) When using the thermocouple compensation wire, you must pay attention to the matching of the model, the polarity can not be wrong, and the temperature of the compensation wire and the thermocouple connection end can not exceed 100 ℃. (2) When a thermocouple with a large time constant is used for temperature measurement or temperature control, although the temperature displayed by the instrument fluctuates very little, the actual furnace temperature may fluctuate greatly. In order to accurately measure the temperature, a thermocouple with a small time constant should be selected. (3) After correct wiring according to the meter wiring diagram and power on, the meter first displays the thermocouple index number of the meter, and then displays the meter range, then the lower row of the meter displays the set temperature, and the upper row of the meter displays the measurement. temperature. (4) The platinum-rhodium thermocouple cannot be installed in an area where the measured medium seldom flows. When using a thermocouple to measure the gas temperature in the tube, the thermocouple must be installed against the direction of the flow rate and fully contacted with the gas. (5) In order to have sufficient heat exchange between the measuring end of the thermocouple and thermal resistance and the measured medium, the position of the measuring point should be selected reasonably and try to avoid near the valve. (6) According to the law of intermediate conductors, in the actual temperature measurement application of thermocouples, hot-end welding and cold-end open-circuit are often used, and the cold-end is connected to the display instrument via a connecting wire to form a temperature measurement system.
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