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Thermocouple Tolerance Class Table (IEC 60584)
Thermocouple tolerance table showing the permitted deviation of new thermocouple wire for each type and tolerance class, with the limit worked out at common temperatures.
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Tolerance classes by thermocouple type
| Type | Class | Temperature range | Tolerance |
|---|---|---|---|
| K, N | 1 | −40 to 375 °C | ± 1.5 °C |
| K, N | 1 | 375 to 1000 °C | ± 0.004 × |t| |
| K, N | 2 | −40 to 333 °C | ± 2.5 °C |
| K, N | 2 | 333 to 1200 °C | ± 0.0075 × |t| |
| K, N | 3 | −167 to 40 °C | ± 2.5 °C |
| K, N | 3 | −200 to −167 °C | ± 0.015 × |t| |
| J | 1 | −40 to 375 °C | ± 1.5 °C |
| J | 1 | 375 to 750 °C | ± 0.004 × |t| |
| J | 2 | −40 to 333 °C | ± 2.5 °C |
| J | 2 | 333 to 750 °C | ± 0.0075 × |t| |
| T | 1 | −40 to 125 °C | ± 0.5 °C |
| T | 1 | 125 to 350 °C | ± 0.004 × |t| |
| T | 2 | −40 to 133 °C | ± 1.0 °C |
| T | 2 | 133 to 350 °C | ± 0.0075 × |t| |
| T | 3 | −67 to 40 °C | ± 1.0 °C |
| T | 3 | −200 to −67 °C | ± 0.015 × |t| |
| E | 1 | −40 to 375 °C | ± 1.5 °C |
| E | 1 | 375 to 800 °C | ± 0.004 × |t| |
| E | 2 | −40 to 333 °C | ± 2.5 °C |
| E | 2 | 333 to 900 °C | ± 0.0075 × |t| |
| E | 3 | −167 to 40 °C | ± 2.5 °C |
| E | 3 | −200 to −167 °C | ± 0.015 × |t| |
| R, S | 1 | 0 to 1100 °C | ± 1.0 °C |
| R, S | 1 | 1100 to 1600 °C | ± [1 + 0.003 × (t − 1100)] |
| R, S | 2 | −40 to 600 °C | ± 1.5 °C |
| R, S | 2 | 600 to 1600 °C | ± 0.0025 × |t| |
| B | 2 | 600 to 1700 °C | ± 0.0025 × |t| |
| B | 3 | 600 to 800 °C | ± 4 °C |
| B | 3 | 800 to 1700 °C | ± 0.005 × |t| |
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Worked limits at common temperatures (± °C)
| °C | K or N class 1 | K or N class 2 | T class 1 | T class 2 |
|---|---|---|---|---|
| 0 | 1.5 | 2.5 | 0.5 | 1.0 |
| 100 | 1.5 | 2.5 | 0.5 | 1.0 |
| 200 | 1.5 | 2.5 | 0.8 | 1.5 |
| 300 | 1.5 | 2.5 | 1.2 | 2.2 |
| 400 | 1.6 | 3.0 | ||
| 500 | 2.0 | 3.8 | ||
| 600 | 2.4 | 4.5 | ||
| 800 | 3.2 | 6.0 | ||
| 1000 | 4.0 | 7.5 | ||
| 1200 | 9.0 |
About this Table
Thermocouple tolerance table showing the permitted deviation of new thermocouple wire for each type and tolerance class, with the limit worked out at common temperatures.
Basis: IEC 60584 1:2013 tolerance classes. The tolerance is the larger of the fixed value and the percentage of |t| within each range. |t| is the temperature in °C without sign.
How to use
- Find your thermocouple type and class (usually printed on the datasheet or sensor tag).
- Pick the row that covers your measuring temperature.
- For percentage rows multiply by the temperature: class 1 type K at 800 °C is ± 0.004 × 800 = ± 3.2 °C.
Notes
- Tolerances apply to new wire as supplied. Drift in service is extra.
- ANSI MC96.1 'special limits' are close to IEC class 1 and 'standard limits' close to class 2.
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Frequently Asked Questions
What is the tolerance of a class 1 type K thermocouple?
± 1.5 °C from −40 to 375 °C and ± 0.4 % of |t| from 375 to 1000 °C.
Which class is better, 1 or 2?
Class 1 is tighter. Class 2 is the common standard grade.
Does the tolerance include the transmitter?
No. Add the transmitter and cold junction errors separately.
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