Thermocouples

We describe below the use of thermocouples in temperature measurement. Their ease of operation, reliability, applicability over a wide range of temperatures ( 100 to C) and the ability to follow transients have made thermocouples very popular in research as well as industrial applications. Thermocouples employ a phenomenon called Seebeck effect. When two junctions formed between two dissimilar metals are maintained at different temperatures a break anywhere in the circuit will exhibit an emf called thermo-emf (Figure 2.16).