When it comes to thermocouples, the word “compensation” can mean two things. The first one deals with the compensation cable and how it differs from the extension cable. Second, you can have cold-junction compensation for higher accuracy when you use copper lead wire. This article is about the latter.
Thermocouple compensation cables are used to avoid creating a thermal electromotive force (EMF) in the connection terminals. A temperature change in the terminals can change the readings. However, the transmitter should compensate for this difference automatically.
You have two ways to compensate the cold junction, the electrical bridge method, and the thermoelectric refrigeration method. If you want to know about those, then post another #WishIknew!
This video will teach you more about temperature measurement:
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