Table 5.
Long-stem standard platinum resistance thermometer ITS-90 calibrations. The expanded uncertainty (k = 2) is denoted by U
| ITS-90 Fixed Points | Ar TP | Hg TP | H2O TP | Ga MP | In FP | Sn FP | Zn FP | Al FP | Ag FP | |
|---|---|---|---|---|---|---|---|---|---|---|
| ITS-90 assigned temperature (°C) | −189.3442 | −38.8344 | 0.01 | 29.7646 | 156.5985 | 231.928 | 419.527 | 660.323 | 961.78 | |
| ITS-90 subranges |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
Max U (mK) |
| −189.3442 °C to 0.01 °C | 0.08 | 0.14 | 0.02 | 0.27 | ||||||
| −38.8344 °C to 29.7646 °C | 0.14 | 0.02 | 0.04 | 0.14 | ||||||
| 0 °C to 29.7646 °C | 0.02 | 0.04 | 0.04 | |||||||
| 0 °C to 156.5985 °C | 0.02 | 0.10 | 0.10 | |||||||
| 0 °C to 231.928 °C | 0.02 | 0.10 | 0.24 | 0.24 | ||||||
| 0 °C to 419.527 °C | 0.02 | 0.24 | 0.41 | 0.41 | ||||||
| 0 °C to 660.323 °C | 0.02 | 0.24 | 0.41 | 0.64 | 0.64 | |||||
| 0 °C to 961.78 °C | 0.02 | 0.24 | 0.41 | 0.64 | 1.06 | 1.06 |