Controller peripheral modules are available for amplification of several thermocouple inputs with cold junction correction. Figure 15.8(a) shows a differential connection between the amplifier and the thermocouple as twisted pairs of wires that are
screened to minimize noise. Other configurations of thermocouples are shown in Figures 15.8(b, c). In Figure 15.8(b), the thermocouples measure the average temperature at three points in a material, and in Figure 15.8(c), the thermocouples measure the temperature difference between two points in a material.