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Setup for characterization of MOS gas sensors as GC detector.

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Title: Setup for characterization of MOS gas sensors as GC detector.
Authors: Brieger, Oliver1 (AUTHOR) o.brieger@lmt.uni-saarland.de, Bur, Christian1 (AUTHOR), Schütze, Andreas1 (AUTHOR), Sauerwald, Tilman2 (AUTHOR)
Source: Sensors & Actuators B: Chemical. Dec2025:Part 2, Vol. 444, pN.PAG-N.PAG. 1p.
Subjects: Gas chromatography, Gas detectors, Temperature effect, Volatile organic compounds, Sensitivity analysis, Flow simulations, Mass spectrometers
Abstract: This paper presents the development and characterization of a gas sensor characterization platform for gas chromatography (GC) systems. With fluidic modeling we can accurately calculate the flow ratio between two detectors at different outlet pressures – in the presented case a mass spectrometer (MS) at high vacuum and metal oxide semiconductor (MOS) detector at ambient pressure. We further validate the fluidic model through experimental testing with commercially available restrictions and a separation column. A volatile organic calibration mix (EPA 502/524) is used to characterize a commercially available MOS gas sensor as GC detector. The temperature-dependent behavior of MOS sensors is studied, and the overall performance is compared with a laboratory MS. The results show the potential for these sensors in various applications, highlighting the importance of characterizing and verifying system components to ensure reliable results. The study concludes by demonstrating that MOS sensors can be effectively used as GC detectors, with comparable sensitivity and retention times to the total ion current of a traditional MS, paving the way for more accessible and portable GC solutions. • The fluidic model of the presented setup predicts the outlet flow within an RMSE of less than 0,2 mL/min. • The accuracy of the model enables flow prediction in typical GC setups. • The model enables us to initiate countermeasures as well as the successful integration of new detectors. • Retention times of the MOS gas sensor as GC-detector fit markedly well compared to the total ion current of the MS. • We studied the impact of MOS gas sensor temperatures on sensitivity for > 60 substances in an indoor air reference sample. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This paper presents the development and characterization of a gas sensor characterization platform for gas chromatography (GC) systems. With fluidic modeling we can accurately calculate the flow ratio between two detectors at different outlet pressures – in the presented case a mass spectrometer (MS) at high vacuum and metal oxide semiconductor (MOS) detector at ambient pressure. We further validate the fluidic model through experimental testing with commercially available restrictions and a separation column. A volatile organic calibration mix (EPA 502/524) is used to characterize a commercially available MOS gas sensor as GC detector. The temperature-dependent behavior of MOS sensors is studied, and the overall performance is compared with a laboratory MS. The results show the potential for these sensors in various applications, highlighting the importance of characterizing and verifying system components to ensure reliable results. The study concludes by demonstrating that MOS sensors can be effectively used as GC detectors, with comparable sensitivity and retention times to the total ion current of a traditional MS, paving the way for more accessible and portable GC solutions. • The fluidic model of the presented setup predicts the outlet flow within an RMSE of less than 0,2 mL/min. • The accuracy of the model enables flow prediction in typical GC setups. • The model enables us to initiate countermeasures as well as the successful integration of new detectors. • Retention times of the MOS gas sensor as GC-detector fit markedly well compared to the total ion current of the MS. • We studied the impact of MOS gas sensor temperatures on sensitivity for > 60 substances in an indoor air reference sample. [ABSTRACT FROM AUTHOR]
ISSN:09254005
DOI:10.1016/j.snb.2025.138396