Thermocouples - Limit Deviation and Tolerances

Tolerances and limit deviation

Tolerances and the limit deviation for thermocouples are defined in the standard DIN EN 60584. The thermoelectric characteristics can deviate from the standardized basic values of the thermoelectric voltages in certain cases. There are 3 classes defined, which describe the permissible tolerances and limit deviations. See table.

For example, the limit deviation for a type K thermocouple in tolerance class 1 is ±1.5°C or 0.40%. In tolerance class 2, the limit deviation is ±2.5°C or 0.75%. In the following table you will find the tolerances and limit deviations for all common thermocouples:

 
   Class 1
 
Class 2
 
 Class 3
 
 StandardMaterialTemperature-range*²Limit deviationTemperature-range*²Limit deviationTemperature-range*²Limit deviation
type TDIN EN 60584Cu-CuNi-40 up to +350°C±0,5°C
or 0,40%
-40 up to +350°C±1,0°C
or 0,75%
-200 up to +40°C±1,0°C
or 1,5%
type U *¹DIN 43710Cu-CuNi--0 up to +600°C±3°C
or 0,75%
--
type JDIN EN 60584Fe-CuNi-40 up to +750°C±1,5°C
or 0,40%
-40 up to +750°C±2,5°C
or 0,75%
--
type L *¹DIN 43710Fe-CuNi--0 up to +900°C±3°C or
0,75%
--
type KDIN EN 60584NiCr-Ni-40 up to +1000°C±1,5°C
or 0,40%
-40 up to +1200°C±2,5°C
or 0,75%
-200 up to +40°C±2,5°C
or 1,5%
type EDIN EN 60584NiCr-CuNi-40 up to +800°C±1,5°C
or 0,40%
-40 up to +900°C±2,5°C
or 0,75%
-200 up to +40°C±2,5°C
or 1,5%
type NDIN EN 60584NiCrSi-NiSi-40 up to +1000°C±1,5°C
or 0,40%
-40 up to +1200°C±2,5°C
or 0,75%
-200 up to +40°C±2,5°C
or 1,5%
type SDIN EN 60584PtRh 10-Pt0 up to +1600°C±1,0°C
or *³
0 up to +1600°C±1,5°C
or 0,25%
--
type RDIN EN 60584PtRh13-Pt0 up to +1600°C±1,0°C
or *³
0 up to +1600°C±1,5°C
or 0,25%
--
type BDIN EN 60584PtRh30-PtRh6--+600 up to +1700°C±1,5°C
or 0,25%
+600 up to +1700°C±4,0°C
or 0,5%

Classes 1, 2, and 3 are valid for thermocouples

*¹ Since April 1994 the standard DIN 43710 is no longer valid.
*² For the limit deviation, the higher value is valid.
*³ 1°C or [1 + (t - 1100) x 0,003] °C

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