A thermocouple is a sensor that measures temperature. It consists of two different types of metals, joined together at one end. When the junction of the two metals is heated or cooled, a voltage is created that can be correlated back to the temperature. A thermocouple is a simple, robust and cost-effective temperature sensor used in a wide range of temperature measurement processes

Thermocouples are available in different combinations of metals or calibrations. The most common are the “Base Metal” thermocouples known as Types J, K, T, E and N. There are also high temperature calibrations – also known as Noble Metal thermocouples – Types R, S, C and GB.

Each calibration has a different temperature range and environment, although the maximum temperature varies with the diameter of the wire used in the thermocouple.

Although thermocouple calibration dictates the temperature range, the maximum range is also limited by the the diameter of the thermocouple wire. That is, a very thin thermocouple may not reach the full temperature range.

K Type Thermocouples are known as general purpose thermocouple due to its low cost and temperature range.

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