Table 3.
Capsule standard platinum resistance thermometer ITS-90 calibrations. Vapor pressure is denoted by VP and the expanded uncertainty (k = 2) is denoted by U
| ITS-90 Fixed Points | e-H2 TP | e-H2 VP | e-H2 VP | Ne TP | O2 TP | Ar TP | Hg TP | H2O TP | Ga MP | In FP | Sn FP | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ITS-90 assigned temperature (K) | 13.8033 | 17.0 | 20.3 | 24.5561 | 54.3584 | 83.8058 | 234.3156 | 0.01 | 302.9146 | 429.7485 | 505.078 | |
| ITS-90 subranges |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
U (mK) |
Max U (mK) |
| 13.8033 K to 273.16 K | 0.22 | 0.21 | 0.22 | 0.26 | 0.18 | 0.08 | 0.20 | 0.02 | 0.62 | |||
| 24.5561 K to 273.16 K | 0.22 | 0.26 | 0.18 | 0.08 | 0.20 | 0.02 | 0.39 | |||||
| 54.3584 K to 273.16 K | 0.18 | 0.08 | 0.20 | 0.02 | 0.29 | |||||||
| 83.8058 K to 273.16 K | 0.08 | 0.20 | 0.02 | 0.39 | ||||||||
| 234.3156 K to 302.9146 K | 0.20 | 0.02 | 0.04 | 0.20 | ||||||||
| 273.15 K to 302.9146 K | 0.02 | 0.04 | 0.04 | |||||||||
| 273.15 K to 429.7485 K | 0.02 | 0.10 | 0.10 | |||||||||
| 273.15 K to 505.078 K | 0.02 | 0.10 | 0.24 | 0.24 |