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A New Primary Dew-Point Generator at TUBITAK UME

  • TEMPMEKO 2016
  • Published:
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Abstract

An implementation of a new low-range primary humidity generator as a part of an international collaboration between TUBITAK UME and VTT MIKES was initiated as a EURAMET Project Number 1259. The dew-point generator was designed and constructed within the scope of the cooperation between TUBITAK UME and VTT MIKES in order to extend the dew-point temperature measurement capability of Humidity Laboratory of TUBITAK UME down to − 80 °C. The system was thoroughly characterized and validated at TUBITAK UME to support the evidence for dew-point temperature uncertainties. The new generator has a capability of operating in the range of − 80 °C to +10 °C, but at the moment, it was characterized down to − 60 °C. The core of the generator system is a saturator which is fully immersed in a liquid bath. Dry air is supplied to the saturator through a temperature-controlled pre-saturator. The operation of the system is based on the single-pressure generation method with a single pass, i.e., the dew-point temperature is only controlled by the saturator temperature, and the humidity-controlled air is not returned to the system after leaving of the saturator. The metrological performance of the saturator was investigated thoroughly at both National Metrology Institutes. The pre-saturator was also tested using a thermostatic bath at VTT MIKES prior to sending them to TUBITAK UME. This paper describes the principle and design of the generator in detail. The dew-point measurement system and the corresponding uncertainty analysis of the dew-point temperature scale realized with the generator in the range from − 60 °C to 10 °C is also presented.

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Authors and Affiliations

  1. TUBITAK Gebze Yerleskesi, TUBITAK UME, Dr. Zeki Acar Cad., No. 1, 41470, Gebze, Kocaeli, Turkey

    S. Oğuz Aytekin & N. Karaböce

  2. Centre for Metrology MIKES, VTT Technical Research Centre of Finland, Espoo, Finland

    M. Heinonen & H. Sairanen

Authors
  1. S. Oğuz Aytekin
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  2. N. Karaböce
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  3. M. Heinonen
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  4. H. Sairanen
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Corresponding author

Correspondence to S. Oğuz Aytekin.

Additional information

Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science.

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Oğuz Aytekin, S., Karaböce, N., Heinonen, M. et al. A New Primary Dew-Point Generator at TUBITAK UME. Int J Thermophys 39, 62 (2018). https://doi.org/10.1007/s10765-018-2375-2

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  • DOI: https://doi.org/10.1007/s10765-018-2375-2

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