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Thermocouple consists of two wires, each made of diferent metal welded together at one end When the welded point(measuring unction)s heated. thermoelectromotive force s produced that is proportional of the temperature diference between the welded point and the other end (referenceunction) Therefore, by messurng this thermoelectromotive force erther with the reterence Junction temperature kept constant or by using anautomatic compensation curciut, the measuring junction temperature can be measured.The thermoelectromotive force of a thermocouple s independent of the diameter or length of the wire used and depends only on the type of wire used.