Articles | Volume 15, issue 3
Atmos. Meas. Tech., 15, 819–832, 2022

Special issue: Analysis of atmospheric water vapour observations and their...

Atmos. Meas. Tech., 15, 819–832, 2022

Research article 16 Feb 2022

Research article | 16 Feb 2022

Silicone tube humidity generator

Robert F. Berg et al.

Related subject area

Subject: Gases | Technique: Laboratory Measurement | Topic: Instruments and Platforms
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Revised manuscript accepted for AMT
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Cited articles

Berg, R. F.: Simple flow meter and viscometer of high accuracy for gases, Metrologia, 42, 11–23,, 2005. 
Berg, R. F., Gooding, T., and Vest, R. E.: Constant pressure primary flow standard for gas flows from 0.01 cm3/min to 100 cm3/min (0.007–74 µmol/s), Flow Meas. Instrum., 35, 84–91,, 2014. 
Berg, R., Chiodo, N., and Georgin, E.: AMT-2021-217 (Berg, Chiodo, Georgin) Laboratory measurements of gas temperature, pressure, and flow rate, Zenodo [data set],, 2022. 
Crank, J.: The Mathematics of Diffusion, second edn., Oxford University Press, UK, ISBN 0-19-853411-6, 1975. 
Cuccaro, R., Rosso, L., Smorgon, D., Beltramino, G., Tabandeh, S., and Fernicola, V.: Development of a low frost-point generator operating at sub-atmospheric pressure, Meas. Sci. Technol., 29, 054002-12,, 2018. 
Short summary
We made a humidity generator that adds water vapor to a flowing gas. Its range of humidity is useful for calibrating balloon-borne probes to the Earth's stratosphere. The generator’s novel feature is a saturator that comprises 5 m of silicone tubing immersed in water. The length was enough to ensure that the saturator’s output was independent of the dimensions and permeability of the tube. This simple, low-cost design provides an accuracy that is acceptable for many applications.