NIS PRIMARY DEW/FROST-POINT GENERATOR OPERATING FROM -50 °C TO 0 °C IN DEW POINT TEMPERATURE

Doaa Abd El-Gelil, M. G. Ahmed, Essam El-Din Mahmoud, Said Mazen

Abstract

This paper describes construction and characterization of a dew/frost -point generator developed at national institute for standards. It is intended to operate in the range from -50 °C to 0 °C. The air flows through a saturator controlled by a regulated flow meter. The reference dew/frost -point temperature was measured by Standard Platinum Resistance Thermometer (SPRT) connected to a resistance bridge. A comparative study between the saturator temperature of the new generator measured by SPRT and the dew/frost-point temperature of a calibrated chilledmirror hygrometer was conducted. It helped to determine the uncertainty of saturator; this uncertainty was found to be between ± 0.06 °C to ± 0.15 °C at confidence limit of 95%.Several experiments were carried out in the mentioned range. Obtained results gave the confidence that NIS generator could be used as a primary humid air generator.

Keywords

characterization, standard, dew/frost point generator, measurement uncertainty

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IMEKO-WC-2012-TC12-P2.pdf

DOI

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IMEKO TC

TC12 - Temperature and Thermal Measurements

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