May 2011
Beginner
492 pages
14h 16m
English
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2.6 Thermocouple Thermometers
These are another type of secondary thermometers, the theory of which depends on the fact that when the two junctions of two metals are at different temperatures, an electromotive force (emf) is generated in the circuit. This emf is a function of the temperature difference of the junctions. Hence, it is named as thermo emf. The emf here is the thermometric property.
The choice of the metals forming the couple depends on the temperature region at which it is used. The two pure metals are taken in the form of wire and are soldered at points at their ends. The two wires must not touch each other except at the point of soldering and hence, they are insulated. One of the junctions is introduced in cold ice; it is called ...
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