Progress in the knowledge of the water saturation curve is required to improve the accuracy of the calibrations in humidity. In order to achieve this objective, the LNE-CETIAT and the LNE-CNAM have jointly built a facility dedicated to the measurement of the saturation vapor pressure and temperature of pure water. The principle is based on a static measurement of the pressure and the temperature of pure water in a closed, temperature-controlled thermostat, conceived like a quasi-adiabatic calorimeter. A copper cell containing pure water is placed inside a temperature-controlled copper shield, which is mounted in a vacuum-tight stainless steel vessel immersed in a thermostated bath. The temperature of the cell is measured with capsule-type standard platinum resistance thermometers, calibrated with uncertainties below the millikelvin. The vapor pressure is measured by calibrated pressure sensors connected to the cell through a pressure tube whose temperature is monitored at several points. The pressure gauges are installed in a thermostatic apparatus ensuring high stability of the pressure measurement and avoiding any condensation in the tubes. Thanks to the employment of several technical solutions, the thermal contribution to the overall uncertainty budget is reduced, and the remaining major part is mainly due to pressure measurements. This paper presents a full description of this facility and the preliminary results obtained for its characterization.
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July 2012
Research Article|
July 25 2012
Development of a quasi-adiabatic calorimeter for the determination of the water vapor pressure curve Available to Purchase
S. Mokdad;
S. Mokdad
a)
1
LNE-CETIAT
, Villeurbanne, France
2
Laboratoire commun de métrologie LNE-CNAM (LCM)
, La Plaine Saint-Denis, France
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Y. Hermier;
Y. Hermier
2
Laboratoire commun de métrologie LNE-CNAM (LCM)
, La Plaine Saint-Denis, France
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F. Sparasci;
F. Sparasci
2
Laboratoire commun de métrologie LNE-CNAM (LCM)
, La Plaine Saint-Denis, France
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M. Himbert
M. Himbert
2
Laboratoire commun de métrologie LNE-CNAM (LCM)
, La Plaine Saint-Denis, France
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S. Mokdad
1,2,a)
E. Georgin
1
Y. Hermier
2
F. Sparasci
2
M. Himbert
2
1
LNE-CETIAT
, Villeurbanne, France
2
Laboratoire commun de métrologie LNE-CNAM (LCM)
, La Plaine Saint-Denis, France
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Rev. Sci. Instrum. 83, 075114 (2012)
Article history
Received:
April 06 2012
Accepted:
July 02 2012
Citation
S. Mokdad, E. Georgin, Y. Hermier, F. Sparasci, M. Himbert; Development of a quasi-adiabatic calorimeter for the determination of the water vapor pressure curve. Rev. Sci. Instrum. 1 July 2012; 83 (7): 075114. https://doi.org/10.1063/1.4737627
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