Taw qhia ntawm Thermocouple thiab ntsuas kub ntsuas lub hauv paus ntsiab lus

1. Taw qhia qhia rau thermocouples

Thermoelectric kub cov ntaubntawv feem ntau siv thermochochtature ntsuas kub thiab txias rau cov khoom kub ntawm 2800 xyoo ntsuas kev ntsuas {{{}} Vim li ntawm kev ntsuas hluav taws xob thiab ntsuas kub thiab txias, thiab txias rau kev ntsuas kub thiab ntsuas kub thiab txias

2.} Kev ntsuas ntsuas kub ntsuas lub hauv paus:

Definition: A sensor composed of two conductors that converts temperature into thermoelectric potential is called a thermocouple. 2. Temperature measurement principle: The temperature measurement principle of thermocouples is based on the thermoelectric effect. Connect conductors A and B of two different materials in series to form a closed loop. When the temperatures of the two junctions 1 and 2 are different, if T>T0 (as shown in Figure 12-1 Thermoelectric effect), a thermoelectric potential will be generated in the loop, and a certain amount of current will be generated in the loop. This phenomenon is called the thermoelectric effect. The thermoelectric potential is recorded as EAB, and conductors A and B are called thermoelectrodes. Junction 1 is usually welded together. When measuring, it is placed in a temperature measurement location to feel the measured temperature, so it is called the measuring end (or working end, hot end). Junction 2 requires a constant temperature and is called the reference end (or cold end). 3. Thermoelectric effect: The closed circuit of the thermocouple composed of conductors A and B has two contact potentials, eAB (T) and eAB (T0), at the two junctions. Because T>T{{0}}, there is also a temperature difference potential in conductors A and B. Therefore, the total thermoelectric potential EAB (T, T0) of the closed loop should be the algebraic sum of the contact potential and the temperature difference potential, that is: 4. Total thermoelectric potential of the closed loop For the selected Thermocouple, thaum siv qhov ntsuas kub yog tas li, muaj nuj nqis tag nrho ntawm cov ntsuas kub thiab txias, thermocouple .