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04___Thermocouples_cont - MAD 413 MAD Instrumentation...

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MAD 413 MAD 413 Instrumentation & Control Instrumentation & Control by by Dr. E. Caner ORHAN Dr. E. Caner ORHAN Hacettepe University Hacettepe University Department of Mining Engineering Department of Mining Engineering Thermocouples Thermocouples (continued)
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MAD 413 – Instrumentation & Control Lecture Notes by Dr. E.Caner ORHAN Thermoelectric effects The basic theory of the thermocouple effect is found from a consideration of the electrical and thermal transport properties of different metals . In particular, when a temperature differential is maintained across a given metal, the vibration of atoms and motion of electrons is affected so that a difference in potential exists across the material (Seebeck effect) .
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MAD 413 – Instrumentation & Control Lecture Notes by Dr. E.Caner ORHAN Thermoelectric effects The proper description of such an effect is to say that an emf has been established in the circuit that is causing the current to flow. In the figure, there are two different metals A and B
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