
Principles of analog value processing
4.6 Wiring and connecting thermocouples
S7-300 Module data
Manual, 02/2013, A5E00105505-08
259
Thermocouple structure
Thermocouples consist of a pair of thermal probes and all necessary installation and
connecting parts. The thermocouple pair consists of two wires made of different metals, or of
metal alloys soldered or welded together at their ends.
The different thermocouple types, for example, K, J or N, are derived from different material
compositions. The measuring principle of all thermocouples is the same, irrespective of their
type.
°C
① Measurement point
② Thermocouple with positive and negative thermal elements
③ Terminal
④ Compensating line
⑤ Reference junction
⑥ Supply line
⑦ Thermal voltage acquisition point
Figure 4-13 Fig. 4-22 Structure of thermocouples
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