Next Article in Journal
The Caribbean and 1.5 °C: Is SRM an Option?
Next Article in Special Issue
Bacterial Contamination in Health Care Centers: Differences between Urban and Rural Settings
Previous Article in Journal
Evaluation of ENSO Prediction Skill Changes since 2000 Based on Multimodel Hindcasts
Previous Article in Special Issue
Investigations of Museum Indoor Microclimate and Air Quality. Case Study from Romania
Article

Measuring Hydrogen in Indoor Air with a Selective Metal Oxide Semiconductor Sensor

Lab for Measurement Technology, Saarland University, Campus A5 1, 66123 Saarbruecken, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Elisabete Carolino
Atmosphere 2021, 12(3), 366; https://doi.org/10.3390/atmos12030366
Received: 6 February 2021 / Revised: 1 March 2021 / Accepted: 5 March 2021 / Published: 11 March 2021
(This article belongs to the Special Issue Indoor Air Quality—What Is Known and What Needs to Be Done)
Hydrogen is a ubiquitous but often neglected gas. In analytical measurements hydrogen—as a harmless gas—often is not considered so no studies on hydrogen in indoor air can be found. For metal oxide semiconductor (MOS) gas sensors that are increasingly pushed into the application as TVOC (total volatile organic compounds) sensors, hydrogen is a severe disturbance. On the other hand, hydrogen can be an intentional choice as indicator for human presence similar to carbon dioxide. We present a field-study on hydrogen in indoor air using selective MOS sensors accompanied by an analytical reference device for hydrogen with an accuracy of 10 ppb. Selectivity is achieved by siloxane treatment combined with temperature cycled operation and training with a complex lab calibration using randomized gas mixtures, yielding an uncertainty of 40–60 ppb. The feasibility is demonstrated by release tests with several gases inside a room and by comparison to the reference device. The results show that selective MOS sensors can function as cheap and available hydrogen detectors. Fluctuations in hydrogen concentration without human presence are measured over several days to gain insight in this highly relevant parameter for indoor air quality. The results indicate that the topic needs further attention and that the usage of hydrogen as indicator for human presence might be precluded by other sources and fluctuations. View Full-Text
Keywords: hydrogen; indoor air; human presence; metal oxide semiconductor gas sensors; indoor air quality hydrogen; indoor air; human presence; metal oxide semiconductor gas sensors; indoor air quality
Show Figures

Figure 1

MDPI and ACS Style

Schultealbert, C.; Amann, J.; Baur, T.; Schütze, A. Measuring Hydrogen in Indoor Air with a Selective Metal Oxide Semiconductor Sensor. Atmosphere 2021, 12, 366. https://doi.org/10.3390/atmos12030366

AMA Style

Schultealbert C, Amann J, Baur T, Schütze A. Measuring Hydrogen in Indoor Air with a Selective Metal Oxide Semiconductor Sensor. Atmosphere. 2021; 12(3):366. https://doi.org/10.3390/atmos12030366

Chicago/Turabian Style

Schultealbert, Caroline, Johannes Amann, Tobias Baur, and Andreas Schütze. 2021. "Measuring Hydrogen in Indoor Air with a Selective Metal Oxide Semiconductor Sensor" Atmosphere 12, no. 3: 366. https://doi.org/10.3390/atmos12030366

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop