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14_MAE 334Woodward - lab2

14_MAE 334Woodward - lab2 - the temperature difference...

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MAE 334 Lab 2 Figure 12. Typical thermocouple as it would be attached to a measurement system. The first thermocouple junction is at temperature, T 1 , the second junction, made at the measuring device is at T 2 . The voltage produced is a function of the temperature difference between T 1 and T 2 and is not affected by the temperature of the wires between the two junctions, namely T 3 . Figure 13. A thermocouple circuit employing a constant temperature cold junction. In Figure 13, the second junction, at temperature T 2 , is held at a constant known temperature (in an ice bath at 0 Celsius). The voltage produced will be a function of
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Unformatted text preview: the temperature difference between the ice bath and T 1 . Note that the junction at the measurement device no longer contains dissimilar metals (wire type B is connected to both terminals of the measurement device) and therefore does not contribute its own voltage as it does in Figure 12. If one junction is held at a constant known temperature then the voltage generated will be a function of the temperature of the other junction. 16 Page 14 of 16...
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