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In the framework of the European research project MeteoMet, the LNE-CNAM andthe LNE-CETIAT are developing novel copper cells for the determination of thewater vapour pressure equation and the measurement of the triple point of watertemperature at the highest degree of accuracy.  The Water Vapour Pressure Equation (WVPE) is the basic formula for thecalculation of the vapour pressure and other humidity related quantities.Improvement in the uncertainty of the water vapour formulation in thetemperature range between -80^{\cdot}C (and possibly down to -90^{\cdot}C) and+100^{\cdot}C is needed for the improvement of primary standards in the fieldof hygrometry. The Triple Point of Water (TPW, temperature 273,16 K) plays akey role in thermometry, because of its threefold function. On one side, itdefines the temperature unit, the kelvin. On the other side, it is thereference point in Standard Platinum Resistance Thermometer (SPRT)calibrations, according to the International Temperature Scale of 1990(ITS-90). Finally, it is the connection point between the current definition ofthe kelvin and the future one, based on the Boltzmann constant.  Copper cells for WVPE and TPW allow highly accurate temperature control, fastthermal response time and excellent thermal uniformity, because of the elevatedcopper thermal conductivity. Thus, they can be an outstanding tool for reducingmeasurement uncertainty. Nevertheless, accurate filling techniques andprocedures are necessary, to minimize water contamination and get stable,accurate and reproducible results.  This report describes the filling system and the copper passivation andcleaning procedure, as well as the method for filling copper cells withhigh-purity water.

Copper passivation procedure for water-filled copper cells for applications in metrology