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Publication Citation: Uncertainty Budget for the NIST Hybrid Humidity Generator

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Author(s): Christopher W. Meyer; W Wyatt Miller; Dean C. Ripple; Gregory E. Scace;
Title: Uncertainty Budget for the NIST Hybrid Humidity Generator
Published: December 01, 2012
Abstract: We provide here a detailed uncertainty budget for the new Hybrid Humidity Generator (HHG) that has been constructed at the National Institute of Standards and Technology (NIST). The HHG generates frost/dew points from ‹70 °C to +85 °C using calibration gas flows up to 150 L/min. For frost/dew points above ‹15 °C, the two-pressure method is employed, and for frost points at or below ‹15 °C, the divided-flow method is used (hence the name ,hybridŠ). The total expanded (k=2) uncertainty is estimated for HHG generation of the following quantities: frost/dew point, mole fraction, and relative humidity. The total uncertainty is estimated separately for the two-pressure and divided-flow methods.
Citation: International Journal of Thermophysics
Volume: 33
Issue: 8
Pages: pp. 1488 - 1499
Keywords: humidity, generator, standards, saturator, calibration, hygrometer, uncertainty, water vapor
Research Areas: Weights & Measures, Calibrations (Thermodynamic)
DOI: http://dx.doi.org/10.1007/s10765-010-0880-z  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (823KB)