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Sensors 2015, 15(11), 28088-28098;

Quantitative Ethylene Measurements with MOx Chemiresistive Sensors at Different Relative Air Humidities

CTR Carinthian Tech Research AG, Europastrasse 12, A–9524 Villach, Austria
Department for Nanostructured Materials, Jožef Stefan Institute, Jamova 39, SI–1000 Ljubljana, Slovenia
Philips Consumer Lifestyle Klagenfurt, Koningsbergerstrasse 11, A–9020 Klagenfurt, Austria
Division of Medical Biochemistry, Medical University of Innsbruck, Center for Chemistry and Biomedicine, Innrain 80, A–6020 Innsbruck, Austria
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 5 October 2015 / Revised: 2 November 2015 / Accepted: 3 November 2015 / Published: 6 November 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
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The sensitivity of two commercial metal oxide (MOx) sensors to ethylene is tested at different relative humidities. One sensor (MiCS-5914) is based on tungsten oxide, the other (MQ-3) on tin oxide. Both sensors were found to be sensitive to ethylene concentrations down to 10 ppm. Both sensors have significant response times; however, the tungsten sensor is the faster one. Sensor models are developed that predict the concentration of ethylene given the sensor output and the relative humidity. The MQ-3 sensor model achieves an accuracy of ±9.2 ppm and the MiCS-5914 sensor model predicts concentration to ±7.0 ppm. Both sensors are more accurate for concentrations below 50 ppm, achieving ±6.7 ppm (MQ-3) and 5.7 ppm (MiCS-5914). View Full-Text
Keywords: ethylene; relative humidity; chemiresistive sensor; linear regression model ethylene; relative humidity; chemiresistive sensor; linear regression model

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Krivec, M.; Gunnigle, G.M.; Abram, A.; Maier, D.; Waldner, R.; Gostner, J.M.; Überall, F.; Leitner, R. Quantitative Ethylene Measurements with MOx Chemiresistive Sensors at Different Relative Air Humidities. Sensors 2015, 15, 28088-28098.

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