Uncertainty Budget for the NIST Hybrid Humidity Generator

Published

December 1, 2012

Author(s)

Christopher W. Meyer, W Wyatt Miller, Dean C. Ripple, Gregory E. Scace

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 “hybrid”). 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

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s10765-010-0880-z

Keywords

humidity, generator, standards, saturator, calibration, hygrometer, uncertainty, water vapor

Citation

Meyer, C. , , W. , Ripple, D. and Scace, G. (2012), Uncertainty Budget for the NIST Hybrid Humidity Generator, International Journal of Thermophysics, [online], https://doi.org/10.1007/s10765-010-0880-z (Accessed October 13, 2025)