Preprints
https://doi.org/10.5194/egusphere-2024-611
https://doi.org/10.5194/egusphere-2024-611
27 Mar 2024
 | 27 Mar 2024
Status: this preprint is open for discussion and under review for Atmospheric Measurement Techniques (AMT).

Preparation of low concentration H2 test gas mixtures in ambient air for calibration of H2 sensors

Niklas Karbach, Lisa Höhler, Peter Hoor, Heiko Bozem, Nicole Bobrwoski, and Thorsten Hoffmann

Abstract. Using electrochemical gas sensors for quantitative measurements of trace gas components in ambient air introduces several challenges, of which interference, drift and aging of the sensor are the most significant. Frequent and precise calibration as well as thorough characterization of the sensor helps to achieve reliable and repeatable results. We therefore propose the use of a simple, lightweight and inexpensive setup to produce hydrogen calibration gases with precisely known concentrations in ambient air. The hydrogen is produced by electrolysis with electric current monitoring and the output can be set to any value between ~3 µgH2/min and ~11 µgH2/min. With a dilution flow of 500 mL/min, for example, this results in a concentration range from ~70 ppm up to ~240 ppm, but concentrations significantly below or above this range can also be covered with accordingly modified dilution flows. This setup can be used not only for calibration, but also for thorough and long-term characterization of electrochemical gas sensors to evaluate sensitivity, zero voltage and response time over extended periods of time.

Niklas Karbach, Lisa Höhler, Peter Hoor, Heiko Bozem, Nicole Bobrwoski, and Thorsten Hoffmann

Status: open (until 01 May 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-611', Giuseppe Etiope, 02 Apr 2024 reply
Niklas Karbach, Lisa Höhler, Peter Hoor, Heiko Bozem, Nicole Bobrwoski, and Thorsten Hoffmann
Niklas Karbach, Lisa Höhler, Peter Hoor, Heiko Bozem, Nicole Bobrwoski, and Thorsten Hoffmann

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Short summary
The system presented here can accurately generate and reproduce a stable flow of gas mixtures of known concentrations over several days using ambient air as a dilution medium. In combination with the small size and low weight of the system, this enables the calibration of hydrogen sensors in the field, reducing the influence of matrix effects on the accuracy of the sensor. The system is inexpensive to assemble and easy to maintain, which is the key to reliable measurement results.