Extending dew-point temperature scale up to +50 °C

Author:

El-Gelil Doaa Mohamed Abd,Ahmed Mohamed Gamal

Abstract

Extension of dew-point temperature scale has been performed using a two-temperature (2-T), constant pressure humidity generator that is developed for the first time by the National Institute of Standard (NIS) in order to extend the calibration capabilities to the high dew-point temperature range at NIS. It relies on the saturation of a stream of gas flowing over a water surface maintained at constant, well-known, temperature. In this paper, primary realization of dew-point temperature scale in a dew-point temperature range up to +50 °C was performed to extend calibration capabilities and to improve the uncertainties of the dew-point temperature scale realization. Several experiments were carried out in order to characterize the generator. Characterization comprises studies of the saturator efficiency, temperature stability and a comparison with a calibrated chilled-mirror hygrometer. The results of the efficiency tests showed good performance of the generator. For uncertainty of measurements, a thorough analysis was also described representing estimations of contributions for all the sources that possibly affect measurements.

Publisher

EDP Sciences

Subject

Safety, Risk, Reliability and Quality

Reference10 articles.

1. Zvizdic D., Kolobaric V., Galaso I., Serfezi D., A new two-temperature humidity generator as a primary standard for measuring humidity in Croatia, in Proceedings I of the TEMPMEKO-99, The 7th International Symposium on Temperature and Thermal Measurements , 1999, pp. 203–208

2. A Simple Humidity Generator for Relative Humidity Calibrations

3. The New LMK Primary Standard for Dew-Point Sensor Calibration: Evaluation of the High-Range Saturator Efficiency

4. Zvizdic D., Heinonen M., Veliki T., Sestan D., New primary low-range dew-point generator at LPM, in Proceedings of XIX IMEKO World Congress , 2009, pp. 1567–1570

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