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Surface Temperature Measurements: Treatment of Thermocouple Tips

2023.06.07

Points of this article

・The tip of a thermocouple must not be twisted.

・In order to minimize heat dissipation from the thermocouple, the junction is welded.

Treatment of Thermocouple Tips

In a thermocouple, two different kinds of metal wire are brought into contact to act as a temperature sensor. Occasionally one may see a thermocouple being used with the wires twisted together in contact. Such a thermocouple can be used for temperature measurement, but for correct temperature measurements, as a rule, the tip should be welded.

As stated in an earlier article, for accurate measurements of temperature, heat dissipation from the thermocouple must be held to a minimum. If the thermocouple tip is twisted, heat is dissipated from the excess portion, and the actual temperature drops. To minimize heat dissipation, the junction must be made as small as possible; and for this purpose, welding is optimal.

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Surface Temperature Measurements: Treatment of Thermocouple Tips

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