Type R thermocouple
Pt-13 % Rh / Pt · -50 … 1768.1 °C · IEC 60584-1
At a glance
- Conductors (+ / −)
- Pt-13 % Rh / Pt
- Range of the reference function
- -50 … 1768.1 °C
- Sensitivity at 1000 °C
- 13.23 µV/°C
- Class 1 tolerance
- ±1 °C up to 1100 °C, then ±(1 + 0.003 × (t − 1100)) °C, 0 to 1600 °C
- Class 2 tolerance
- ±1.5 °C up to 600 °C, then ±0.0025 × t, 0 to 1600 °C
Wire colours
| Positive | Negative | Sheath / Jacket | |
|---|---|---|---|
| IEC 60584-3 (international) | orange | white | orange |
| ASTM E230 / ANSI (USA), extension wire | black | red | green |
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) |
|---|---|---|
| 0 | 0.000 | 5.29 |
| 200 | 1.469 | 8.84 |
| 400 | 3.408 | 10.37 |
| 600 | 5.583 | 11.36 |
| 800 | 7.950 | 12.31 |
| 1000 | 10.506 | 13.23 |
| 1200 | 13.228 | 13.92 |
| 1400 | 16.040 | 14.13 |
| 1600 | 18.849 | 13.88 |
Typical use and limits
Platinum-13 % rhodium against platinum, for high temperatures up to about 1600 °C in furnaces, glass production and reference work. The output is low, about 10 to 14 µV/°C over most of the range, so the measuring electronics and the cold junction must be good. Protect the wire from metal vapours and reducing atmospheres with ceramic tubes.
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