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Measuring Temperature with Thermocouples – a Tutorial

Application Note 043. Measuring Temperature with Thermocouples a Tutorial Travis Ferguson Introduction One of the most frequently used Temperature transducers is the thermocouple. Thermocouples are very rugged and inexpensive and can operate over a wide Temperature range. A thermocouple is created whenever two dissimilar metals touch and the contact point produces a small open-circuit voltage as a function of Temperature . This thermoelectric voltage is known as the Seebeck voltage, named after Thomas Seebeck, who discovered it in 1821.

J2 and J3 each have their own Seebeck coefficient and generate their own thermoelectric voltage proportional to the temperature at the DAQ terminals. To determine the voltage contribution from J1, you need to know the temperatures of junctions J2 and J3 as well as the voltage-to-temperature relationships for these junctions.

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