4 Thermocouples
20
4.3 Thermocouple types
Below you will find a table of thermocouples listing standardized voltage series and limit deviations.
In this context, the maximum temperature is the temperature up to which the limit deviations have been
defined. The voltage series has been standardized up to the temperature listed under "Defined up to."
Thermocouples according to DIN EN 60584/IEC 584
Thermocouples according to DIN 43710
The specified maximum temperatures may be reduced by the design of the overall probe (protection fit-
tings, thermocouple dimensions, insulation components, etc.). Also observe the environmental influenc-
es.
Thermocouples according to DIN EN 60584 have been assigned to up to three tolerance classes. These
tolerance classes apply to the thermometers in their as-delivered condition. Depending on the specific
environmental influences involved, use of the devices at higher temperatures may quickly alter the orig-
inal tolerance class supplied (aging).
The user must evaluate the extent of the drift (aging) caused by the operating conditions in their appli-
cation. They must decide on a case-by-base basis how often thermocouples need to be replaced or re-
calibration is required. The choice of thermocouple diameter is also a crucial factor in the aging.
Element Maximum
temperature
Defined up
to
Positive leg Negative leg
Fe-CuNi Type J 750 °C 1200 °C Black (magnetic) White
Cu-CuNi Type T 350 °C 400 °C Brown (copper col-
ored)
White
NiCr-Ni Type K 1200 °C 1370 °C Green White (magnetic)
NiCr-CuNi Type E 900 °C 1000 °C Violet White
NiCrSi-NiSi Type N 1200 °C 1300 °C Pink White
Pt10Rh-Pt Type S 1600 °C 1540 °C Orange White (softer)
Pt13Rh-Pt Type R 1600 °C 1760 °C Orange White (softer)
Pt30Rh-Pt6Rh Type B 1700 °C 1820 °C Gray White
Element Maximum
temperature
(continuous tem-
perature
in clean air)
Defined up
to
Positive leg Negative leg
Fe-CuNi Type L 700 °C 900 °C Red Blue
Cu-CuNi Type U 400 °C 600 °C Red Brown
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