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Does a thermocouple have to touch at the tip or sides to operate correctly?
DavidCary
All thermocouples (whether type J, type K, type T, etc.) measure the difference in temperature between the Tip (junction between two different metals), and the other end of the thermocouple wire, often referred to as the "cold junction."
There must be two such junctions somewhere for the thermocouple to operate correctly; typically the measurement junction is at the tip.
To measure the temperature of some thing, try to put that junction as close as possible to that thing. However, since the thermocouple is metallic and the measurement relies on detecting tiny voltages, connecting the tip electrically to a metallic surface could affect the measurement. For that reason thermocouples often have insulated tips.
Wiki User
∙ 13y ago
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