Thermocouples Join Forces.(detection of temperature changes in a thermocouple wire) From: Design News | Date: November 6, 2006| Author: | COPYRIGHT 2006 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright information

By Jon Titus, Contributing Writer

Many engineers, and some instrument companies, think thermocouples produce a small voltage created by the junction of two dissimilar metals. In fact, the temperature difference from one end of a conductor to the other creates the small electromotive force (EMF) that lets us measure temperatures. Thomas Seebeck discovered this effect in 1822, and it bears his name.

But if we use the same metal as a return electrical path, the temperature gradient creates an equal and opposite EMF in the return circuit. The result: a net EMF of zero. If we ...

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