Priniples of analog value processing
4.6 Wiring thermocouples
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
4-13
Thermocouple structure
Thermocouples consist of a pair of thermal probes, and all necessary installation and
connecting parts. The thermocouple 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 diverse material
compositions. The measuring principle of all thermocouples is the same, irrespective of their
type.
°C
Figure 4-13 Figure 4-22 Thermocouple structure
① Measurement point
② Thermocouple with positive and negative thermo sidepieces
③ Wiring point
④ Compensating line
⑤ Reference junction
⑥ Supply line
⑦ Point for recording thermo voltage
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