In a thermocouple, the combination of two dissimilar materials (A and B) is used

Question

In a thermocouple, the combination of two dissimilar materials (A and B) is used, the Seebeck potential is determined from a differential Seebeck coefficient a_An=a_A-a_B. The net voltage of the junction is dV_AB-a_ABdt and a_AB is the differential coefficient. The voltage as a function of a temperature gradient for a H-type thermocouple with a high degree of accuracy can be approximated by a second order equation: where VAB is in nV and T is in degreeC. Find the Seebeck voltage of this thermocouple at 100degreeC. Find the sensitivity of this thermocouple at 100degreeC. Find the difference in Seebeck voltage over- 100degreeC to +100degreeC The Peltier effect is a phenomena that a certain design of semiconductor junctions can cause

Explanation / Answer

Equation 6.01. Seebeck Voltage
DeAB = aDT
Where:
eAB = Seebeck voltage
T = temperature at the thermocouple junction
a = Seebeck coefficient
D = a small change in voltage corresponding to a small change in temperature

substitute t=100 in this formula you will get the value of seeback effect approximately of 112.2 mv and the thermocouple with a sensitivity of approximately 41 µV/°C.

in the same way find t=-100 and substitue inthe formula and find the difference .

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