Technical Information
5. Limiting deviation for thermocouples
The limiting deviations for those thermocouples which are standardized in the DIN EN 60584-1 are standardized in the DIN EN 60584-2. The organization of the limiting deviations takes place in 3 groups:
- group 1 and 2 for the temperature range > -40°C
- group 3 for negative temperatures to -200°C
| Type | Range Class 1 | Range Class 2 | Range Class 3 |
|---|---|---|---|
| K | -40...1000°C ±1,5°C or 0,004*(t) | -40...1200°C ±2,5°C or 0,0075*(t) | -200...40°C ±2,5°C or 0,0015*(t) |
| J | -40...750°C ±1,5°C or 0,004*(t) | -40...750°C ±2,5°C or 0,0075*(t) | ----- |
| S/R | 0...1600°C ±1,0°C or 1,0+0,003(t-1100)°C |
0...1600°C ±1,5°C or 0,0025*(t) | ----- |
| B | ----- | 600...1700°C ±1,5°C or 0,0025*(t) | 600...1700°C 4°C or 0,005*(t) |
| N | -40...1000°C ±1,5°C or 0,004*(t) | -40...1200°C ±2,5°C or 0,0075*(t) | -200...40°C ±2,5°C or 0,0015*(t) |
| T | -40...350°C ±0,5°C or 0,004*(t) | -40...350°C ±1,0°C or 0,0075*(t) | -200...40°C ±1,0°C or 0,0015*(t) |
| E | -40...800°C ±1,5°C or 0,004*(t) | -40...900°C ±2,5°C or 0,0075*(t) | -200...40°C ±2,5°C or 0,0015*(t) |
Tab. 2: Limiting deviations of thermocouples according to DIN EN 60584-2
|t| = value of the temperature without consideration of the sign
1) as limiting deviations the fixed cored values in °C are valid or those percentages related to the actual temperature in °C. In each case the larger value is valid.
2) thermocouples and thermowires are usually supplied in such a way that the limiting deviations are kept according to above table for the temperature range above -40 °C. The deviations for thermocouples of the same material can be larger at temperatures below -40 °C than the fixed core limiting deviations fixed in class 3. If thermocouples are needed, which should comply with limiting deviations according to classes 1, 2 and/or 3 , these must be stated in the order, since a special selection of the material is necessary.
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