Change law of thermo-electromotive force of platinum-rhodium thermocouple

The platinum-rhodium thermocouple is also called a precious metal thermocouple. As a temperature measurement sensor, it is usually used together with a temperature transmitter, regulator, and display instrument to form a process control system for direct measurement or control of various production processes. Fluids in the 0-1800°C range, steam and gas media, and solid surfaces. When a platinum-ruthenium thermocouple is formed by joining two conductors of two different components into a loop, when the temperatures of the two junctions are different, a thermal current is generated in the loop. If the thermocouple refers to the working end of the junction temperature difference, the instrument will display the thermoelectric potential indicating the temperature value corresponding to the thermocouple. Thermoelectric heat of the platinum crucible thermocouple will increase as the temperature at the measuring end increases. Its size is only related to the temperature of the thermocouple material and the two ends, the length of the hot electrode, and the independent diameter.

Because the appearance of various platinum crucible thermocouples, which are very different from each other, is often the same, the basic structure is almost the same, and is usually composed of the main components of the hot electrode, the insulating sheath protection tube and the junction box. Thermocouple thermometers are contact-type temperature measuring instruments. It is based on the thermoelectric effect, that is, the Seebeck effect principle to measure the temperature. It is a commonly used temperature measurement element in temperature measurement instruments. The conductors A, B of different materials are connected into a closed circuit, one end of the contact temperature measurement point is called a measurement end (or working end), and the other end is called a reference end (or free end). If the temperature t at the measuring end and the reference end are different from t0, the EAB (TA thermoelectric potential, t0) generated in the loops A and B is called the Seebeck effect, which is the thermoelectric effect. The size of the EAB is changed with the conductor A, the temperature of the material and the temperature t and T0, and this circuit is called a prototype thermocouple. In practical applications, one end of A and B are soldered together as a thermocouple and the measuring end is placed at the measured temperature t, the reference end is separated, the wire is connected to the display meter, and the reference junction temperature is maintained stable. The potential measured by the display instrument only changes with the measured temperature.

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