**4.2.1 Output voltage**

To determine the output voltage X of the thermocouple at 31.0 oC and 80.0oC, the thermoelectric emf at 31.0oC is interpolated (S31 = 1.867 mV/oC) and the difference used to determine S = S80 - S31 = 3.116 mV/oC. The output (open-circuit) voltage, V of the thermocouple junction is given by V = S (T80 –T31) = 152.68 mV
