Page 152 - Mechanical Engineers' Handbook (Volume 2)
P. 152
2 Thermocouples 141
Figure 6 Illustration of the law of inserted ma-
terials. (Reproduced from Ref. 2, with permission.)
it makes no contribution to the output of the thermocouple. This proof should not be taken
as a blanket license to connect thermocouple wires together without due care—some instal-
lations may result in temperature gradients near the junction, and those are sensitive to the
presence of a joining material. However, a well-designed probe assures an isothermal zone
around the junction, and those probes are insensitive to the material used to join the ther-
moelements together.
Figure 7 Illustration of the law of intermediate
materials. (Reproduced from Ref. 2, with permis-
sion.)
