Type N thermocouple
Ni-Cr-Si / Ni-Si · -270 … 1300 °C · IEC 60584-1
At a glance
- Conductors (+ / −)
- Ni-Cr-Si / Ni-Si
- Range of the reference function
- -270 … 1300 °C
- Sensitivity at 600 °C
- 38.96 µV/°C
- Class 1 tolerance
- ±1.5 °C or ±0.004 × |t|, whichever is larger, -40 to 1000 °C
- Class 2 tolerance
- ±2.5 °C or ±0.0075 × |t|, whichever is larger, -40 to 1200 °C
Wire colours
| Positive | Negative | Sheath / Jacket | |
|---|---|---|---|
| IEC 60584-3 (international) | pink | white | pink |
| ASTM E230 / ANSI (USA), extension wire | orange | red | orange |
Colours identify the type, not the quality of the cable. Older national codes (e.g. BS 1843, DIN 43714, JIS) used other colours; check before reusing existing cable.
EMF at common temperatures (0 °C reference)
| Temperature (°C) | EMF (mV) | Sensitivity (µV/°C) |
|---|---|---|
| -200 | -3.990 | 9.93 |
| 0 | 0.000 | 26.04 |
| 100 | 2.774 | 29.64 |
| 200 | 5.913 | 32.99 |
| 400 | 12.974 | 37.13 |
| 600 | 20.613 | 38.96 |
| 800 | 28.455 | 39.26 |
| 1000 | 36.256 | 38.61 |
| 1200 | 43.846 | 37.19 |
Typical use and limits
Developed as a more stable alternative to type K: silicon in both legs reduces short-range ordering and oxidation drift, so type N holds its calibration better between 800 and 1200 °C. Output is slightly lower than type K, and it needs instruments and extension cable set up for type N.
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