The water triple point is the most accurately representable fixed point of the 1990 International Temperature Scale (ITS 90). It is 0.01 °C or 273.16 Kelvin.
The accuracy is 0.0001 °C. Due to the high thermal equilibrium of this fixed point, the water triple point cell is optimal for high-precision calibration (e.g. e. g. of platinum resistance thermometers).
Water triple point cell technical data
| TYPE | WTP-LSW2940 | WTP-LSW2950 |
|---|---|---|
| Shown. Temperature | 0.01 °C (273.16 K) | 0.01 °C (273.16 K) |
| Long-term stability | Drift < 0.1 mK/a | Drift < 0.1 mK/a |
| Material | Borosilicate glass | Borosilicate glass |
| Filling liquid | High purity water | High purity water |
| Cell jacket | ||
|---|---|---|
| Outer diameter | 40 mm | 50 mm |
| Length / Total length | 290 mm / 390 mm | 290 mm / 390 mm |
| Insert tube | ||
|---|---|---|
| Inner diameter | 10 mm | 10 mm |
| Traceability | optional with DAkkS calibration certificate | optional with DAkkS calibration certificate |
| Item no. | 51884 | 67059 |
Source : https: ludwig-schneider
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