Thermocouple is actually an energy converter, which converts thermal energy into electrical energy, and uses the generated thermoelectric potential to measure temperature. Regarding the thermoelectric potential of thermocouples, the following issues should be noted: The thermoelectric potential of thermocouples is the work of thermocouples. The difference of the temperature function between the two ends of the thermocouple is not a function of the temperature difference between the cold junction and the working end of the thermocouple. The size of the thermoelectric potential generated by the thermocouple, when the data of the thermocouple is average, has nothing to do with the length and diameter of the thermocouple, only the composition of the thermocouple data and the temperature difference between the two ends; when the two thermocouple wires of the thermocouple are related. After the data composition is confirmed, the size of the thermoelectric potential of the thermocouple is only related to the temperature difference of the thermocouple; if the temperature of the cold end of the thermocouple remains constant, the thermoelectric potential of the thermocouple is only a single-valued function of the temperature of the working end. 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 sticking points 1 and 2 of the conductors A and B, an electromotive force is generated between the two, thus forming a large and small current in the loop. Thermocouples use this effect to work. Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples. The so-called standard thermocouple refers to the thermocouple that the national standard regulates the relationship between its thermoelectric potential and temperature, the allowable error, and has a unified standard indexing table. It has a matching display instrument for selection. Non-standardized thermocouples are not as good as standardized thermocouples in terms of application range or order of magnitude, and generally do not have a unified indexing table, which is mainly used for measurement in some special places. Standardized thermocouples China Since January 1, 1988, all thermocouples and thermal resistances are produced in accordance with IEC international standards, and seven standardized thermocouples of S, B, E, K, R, J, and T are designated as China's unified design type. thermocouple.
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