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Thermocouples


These electrical temperature sensors are produced following the designs of DIN 43772 and are used in machines, systems and apparatus engineering.

• Other versions are also available on request
(different dimensions, materials, thermocouples)
• On request, also available with internationally
recognised UKAS certificate

The measuring procedure of thermocouples utilises the effect that a temperature dependent tension develops at the junction between two different metals. This tension is known as thermo-electromotive voltage and increases as the temperature increases in the case of all thermocouples.

The entire temperature sensor is generally described as a thermocouple. The actual measuring element, the so called thermocouple pair, is formed from the two different conductors (+ and - poles), the thermocouple wires.

Advantages
• Comparatively small design
• Some have a greater temperature range
• Can be less sensitive to mechanical loads

Standards
The standards IEC 584 resp. EN 60584, define the requirements for thermocouples.

In particular, the temperature dependent thermo-electromotive voltages are defined, as well as deviation limits and to some extent the material composition of thermocouple wires.

The following thermocouples are standardized and defined:
• Cu-CuNi (T) Copper-Constantan
• Fe-CuNi (J) Iron-Constantan
• NiCr-CuNi (E) Chromel-Constantan
• NiCr-Ni (K) Chromel-Alumel
• NiCrSi-NiSi (N) Nicrosil-Nisil
• Pt10Rh-Pt (S) PlatinumRhodium-Platinum
• Pt13Rh-Pt® PlatinumRhodium-Platinum
• Pt30Rh-Pt6Rh(B) PlatinumRhodium-Platinum

Thermocouples



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