Introductie van thermokoppel- en temperatuurmetingprincipe

1. Inleiding tot thermokoppels

Thermo -elektrische temperatuurrecorders gebruiken vaak thermokoppels als temperatuurmeetelementen . Het wordt veel gebruikt om de temperaturen te meten in het bereik van -200 graad ~ 1300 graden . in speciale gevallen, het hoge temperatuur van 2800 graden van 2800 graden van 2800 graden van 2800 graden of lage temperatuur en brede temperatuur en breedtemist measurement range. Since thermocouples convert temperature into electrical quantity for detection, it is very convenient to measure and control temperature, as well as to amplify and transform temperature signals, and is suitable for long-distance measurement and automatic control. In contact temperature measurement methods, thermoelectric thermometers are widely used.

2. thermokoppel temperatuurmeting principe:

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}}, er is ook een temperatuurverschilpotentieel in geleiders A en B . Daarom moet de totale thermo -elektrische potentieel EAB (T, T 0) van de gesloten lus de algebruikte Geselecteerd thermokoppel, wanneer de referentietemperatuur constant is, wordt de totale thermo-elektrische potentiaal een functie met één gewaardeerde van de temperatuur T aan het meetuiteinde, dat wil zeggen EAB (ｔ, T0)=f (t) . Dit is de principle van thermokouple temperatuurmeting.}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} in het werkelijke temperatuurmetingen, in de werking van de wireten en in de werking van de wireten en instrumenten in de werking van de wiretes en in de werking van de wiering, het gesloten lus van het thermokoppel .