1. The thermocouple must be composed of two different conductors. 2. The temperature of the two junctions of the thermocouple must be different. A thermocouple is actually a kind of energy converter, which converts heat energy into electrical energy, and uses the generated thermoelectric potential to measure temperature. For the thermoelectric potential of a thermocouple, you should pay attention to the following issues: 1. The thermoelectric potential of a thermocouple is a thermoelectric The temperature difference between the two ends of the working end of the couple is not a function of the temperature difference between the cold junction and the working end of the thermocouple. 2. The size of the thermoelectric potential generated by the thermocouple. When the material of the thermocouple is uniform, it has nothing to do with the length and diameter of the thermocouple, but is only related to the composition of the thermocouple material and the temperature difference between the two ends. 3. After the two thermocouple wires of the thermocouple are determined, the thermoelectric potential of the thermocouple is only related to the temperature difference of the thermocouple; if the temperature of the cold junction of the thermocouple remains constant, the thermoelectric potential of the thermocouple is only Single-valued function of working end temperature. Solder conductors or semiconductors A and B of two different materials to form a closed loop, as shown in the figure. When there is a temperature difference between the two attachment points 1 and 2 of the conductors A and B, an electromotive force is generated between the two, thus forming a large current in the loop. Thermocouples use this effect to work. Expansion information: 1. The structure requirements of the thermocouple 1. The welding of the two thermoelectrodes composing the thermocouple must be firm. 2. The two hot electrodes should be well insulated from each other to prevent short circuits. 3. The connection between the compensation wire and the free end of the thermocouple should be convenient and reliable. 4. The protective sleeve should be able to ensure that the hot electrode is fully isolated from the harmful medium. 2. Working principle Two conductors with different components (called thermocouple wires or thermoelectrodes) are connected at both ends to form a loop. When the temperatures of the two junctions are different, an electromotive force will be generated in the loop. This phenomenon is called Thermoelectric effect, and this electromotive force is called thermoelectric force. Thermocouples use this principle for temperature measurement. The end directly used to measure the temperature of the medium is called the working end (also called the measuring end), and the other end is called the cold end (also called the compensation end); the cold end and the display When the meter or supporting meter is connected, the display meter will point out the thermoelectric potential generated by the thermocouple.
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