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

Sensors (Basel, Switzerland) (2015-11-13)
Matic Krivec, Gerald Mc Gunnigle, Anže Abram, Dieter Maier, Roland Waldner, Johanna M Gostner, Florian Überall, Raimund Leitner
ABSTRACT

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).

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ethylene, ≥99.5%
Sigma-Aldrich
Ethylene, 99.99%