Siemens SIMATIC ET 200AL, System Manual

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Thermocouples
5.1 Selecting thermocouples
Analog value processing
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Function Manual, 06/2014, A5E03461439-AC
Type and temperature range
The different thermocouple types are derived from different material compositions.
Note
Due to physical conditions, thermocouples are extremely inaccurate outside the specified
temperature range. Only use thermocouple in the temperature range specified by the
manufacturer.
The following table lists the types and material compositions, as well as the temperature
measuring range of different thermocouples:
Type Material composition Temperature range
B PtRh-PtRh 250 to 1820 °C
C W-Re 0 to 2315 °C
E NiCr-CuNi -270 to 1000 °C
J Fe-CuNi -210 to 1200 °C
K NiCr-Ni -270 to 1372 °C
L Fe-CuNi -200 to 900 °C
N NiCrSi-NiSi -270 to 1300 °C
R PtRh-Pt (Pt 13%) - 50 to 1769 °C
S PtRh-Pt (Pt 10%) -50 to 1769 °C
T Cu-CuNi -270 to 400 °C
U Cu-CuNi -200 to 600 °C
TXK/XKL NiCr-CuCr -200 to 800 °C