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Water-Triple-Point-Cells

Jarrett-Isotech Water Triple Point Cells

Internationally proven water triple point standards The Water Triple Point is the most important fixed point in temperature metrology, and the only point common to both ITS-90 and the Thermodynamic Temperature Scale. It is an essential reference for every temperature laboratory.

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Jarrett-Isotech Water Triple Point Cells

Features

  • Fifty Years of Proven Use
  • Uncertainty 0.000070°C
  • Quartz Glass and Isotopic Analysis Available
Jarrett-Isotech Water Triple Point Cells

Description

Jarrett-Isotech Water Triple Point Cells have been in production since 1958 and have a remarkable record of independent evaluation. An early independent comparison showed the first cell to be within 0.000006 °C of the reference cell. More recently, the CCT-K7 key comparison of water triple point cells showed laboratories using both recent and older Jarrett-Isotech cells tightly grouped, at the level of tens of microkelvin around the BIPM reference value.

This international comparison history is further reinforced by a recent PTB–NIM comparison, in which Isotech cells held by PTB were included in high-level work comparing national water triple point realisations. Together, these published examples demonstrate the long-term confidence placed in Jarrett-Isotech cells for demanding primary standards applications.

CCT-K7 key comparison record, BIPM
https://www.bipm.org/kcdb/comparison?id=105

PTB–NIM comparison paper, Measurement: Sensors
https://www.sciencedirect.com/science/article/pii/S266591742400597X

Jarrett-Isotech Water Triple Point Cells

Specifications

Premium Water Triple Point Cells – Borosilicate GlassThese Premium Cells can be calibrated to an uncertainty of +/- 0.000070°C (0.07mK) A11-50-270*, A13-50-270*, B11-50-270, B11-65-270*, B13-65-270, B16-65-270 *also available in Quartz Glass.
ReproducibilityThe equilibrium temperature of a cell will repeat to within ±0.000,02°C of the mean equilibrium temperature.
StabilityAfter equilibrium is reached, the mean temperature of the inner melt of an ice mantle will remain constant to within ±0.000,01°C for as long as the mantle can be preserved (up to 90 days in some instances).
Further Laboratory Water Triple Point CellsThese Cells have shorter immersion depth and can be calibrated to an uncertainty of ±0.000100°C (0.1mK). B12-40-210, B12-46-210.
LifeCells made from Borosilicate Glass may drift lower in temperature by up to 0.1mK after 10 to 20 years. Cells made from Quartz Glass are expected to last 10 times longer.
AccuracyThe equilibrium of temperature of the Jarrett-Isotech Triple Point of Water Cell is within ±20μK of the 2005 definition as described in CCT/05-07/rev(2). Isotopic Analysis can be provided to give the exact composition within ±3μK.
Slim Water Triple Point CellsB8-30-130 This small cell fits into portable Dry Block Calibrators for use outside of the calibration industry. It can be calibrated to ±0.0005°C (0.5mK).

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