Principles of analog value processing
4.6 Wiring and connecting thermocouples
S7-300 Module data
250 Manual, 06/2017, A5E00105505-AJ
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.
Thermocouple with positive and negative thermal elements
Thermal voltage acquisition point
Figure 4-13 Fig. 4-22 Structure of thermocouples
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