Precautions for on-site use of platinum rhodium thermocouples and installation requirements

It is a commonly used temperature measuring element in temperature measuring instruments. It directly measures the temperature and converts 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 thermocouples are: the main fixing methods are threaded connection, flange connection and welding. The applicable occasions and requirements are different, mainly according to the pressure, temperature and other parameters. So what aspects should we pay attention to when installing and using? Today I will tell you one by one. 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 meter 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. Perform correct wiring according to the meter wiring diagram. After powering on, the meter first displays the thermocouple index number of the meter, then displays the meter range range, and then measures the lower row of the meter to display the set temperature, and the upper row of the meter to display the measured temperature. . 4. The 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 flow velocity and fully in contact with the gas. 5. In order to have sufficient heat exchange between the measuring end of the thermocouple and the thermal resistance and the measured medium, the position of the measuring point should be selected reasonably, and try to avoid the valve. 6. According to the law of the intermediate conductor, in the actual temperature measurement application of the thermocouple , Often adopt the form of hot-end welding and cold-end open circuit, and the cold end is connected with the display instrument through the connecting wire to form a temperature measurement system.

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