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a) Functionality / Norms

Thermocouples of IEC 584-3

One connect 2 metals with different Thermoelectric strength to one thermo-pair so, an EMK develops at the free ends, their height is dependent on the difference of that Thermostrengths of the two metals and from the Temperature-difference between measuring point and free ends. The free ends also called as comparison-position. The formula EMK is valid consequently = f (T).

One gives the different thermo-pairs in the reference tables after IEC 584-3 Part 1 at, for example type K, J, N, S, R, B, T, E. The limit-deviations become in the Part 2 divided after tolerance-classes 1, 2 and 3 and document. The Part 3 treats that Extension – and Compensating cables; here the colour-code is for the respective thermocouples - type and the tolerance-class deposits.

Limit deviation – tolerance-class for thermo-pair
(comparison-put-temperature 0 °C)

Type- thermo-pair +/-
Class 1
Class 2
Class 3
K - NiCr / Ni
1,5 ° C oder 0,4 % x t - 40 ° C .......... +1000 °C
2,5 °C or 0,75 % x t -40 °C .......+ 1200 °C
2,5 °C or 1,5 % x t -200 °C ......... + 40 °C
J - Fe / CuNi
1,5 ° C or 0,4 % x t - 40 ° C ....... +750 °C
2,5 °C or 0,75 % x t -40 °C .........+ 750 °C
-
N - Nicrosil / Nisil
1,5 ° C or 0,4 % x t - 40 °C .......+1000 °C
2,5 °C or 0,75 % x t -40 °C .........1200 ° C
2,5 °C or 1,5% x t -200 °C.......... +40 °C
S - Pt10%Rh / Pt R - Pt 13%Rh / Pt
1 ° C oder 1+(t - 1100) x 0,003 °C 0 °C ......... + 1600 °C
1,5 °C or 0,25 % x t 0 °C ........... + 1600 ° C
-
B - Pt30% Rh / Pt6%Rh
-
0,25% x t 600 °C ......... 1700 °C
4 °C or 0,5 % x t +600 °C ....... + 1700 °C
T - Cu/CuNi
0,5 °C or 0,4% x t - 40 °C........ + 350 °C
1 °C or 0,75 % x t - 40 °C .......... + 350 °C
1 °C or 1,5% x t -200 °C ........... + 40 °C
E - NiCr/ CuNi
1,5 ° C or 0,4 % x t - 40 ° C ........ + 800 °C
2,5 °C or 0,75% x t -40 °C .......... + 900 °C
2,5 °C or 1,5 % x t -200 °C ....... + 40 °C

For border-deviation (+/-) is valid the bigger value in each case and for the delivery-condition of the thermocouples. / t = | t |

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