Uvedba načela merjenja termoelementa in temperature

1. Uvod v termoelemente

Thermoelectric temperature recorders often use thermocouples as temperature measuring elements. It is widely used to measure temperatures in the range of -200℃~1300℃. In special cases, it can measure high temperatures of 2800℃or low temperatures of 4K. It has the characteristics of simple structure, low price, high accuracy, and wide Območje merjenja temperature . Ker termoelementi pretvorijo temperaturo v električno količino za odkrivanje, je zelo priročno meriti in nadzorovati temperaturo, pa tudi za povečanje in preoblikovanje temperaturnih signalov, in je primeren za merjenje na dolge razdalje in samodejne kontrole . v primerjavi s kontaktno temperaturno metodo, termoelektične themmoelechtic, termoelektične thermomere, termoelektične themomnice, termoelektične themmoelechtic, termoelence thermoelectric thermoelectric thermoelectric thermoelechtic thermoelechtics v termolehni thermoelechtric thermoelectric thermomrics thermoelectric thermomters, thermoelectric thermomters.

2. Načelo merjenja temperature termoelemente:

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}}, v prevodnikih A in B . obstaja tudi temperaturni razlik For the selected thermocouple, when the reference temperature is constant, the total thermoelectric potential becomes a single-valued function of the temperature T at the measuring end, that is, EAB (Ｔ, T0)=f (T). This is the basic principle of thermocouple temperature measurement. In actual temperature measurement, connecting wires and Instrumente je treba vnesti v zaprto zanko termoelementa .