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J. Sens. Sens. Syst., 7, 235-243, 2018
https://doi.org/10.5194/jsss-7-235-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular research article
05 Apr 2018
Highly sensitive benzene detection with metal oxide semiconductor gas sensors – an inter-laboratory comparison
Tilman Sauerwald1, Tobias Baur1, Martin Leidinger1, Wolfhard Reimringer2, Laurent Spinelle3, Michel Gerboles3, Gertjan Kok4, and Andreas Schütze1 1Laboratory for Measurement Technology, Saarland University, Saarbrücken, 66123, Germany
23S GmbH, Saarbrücken, 66121, Germany
3European Commission—Joint Research Centre, Directorate for Energy, Transport and Climate, 21027 Ispra, Italy
4VSL, Thijsseweg 11, 2629 JA Delft, the Netherlands
Abstract. For detection of benzene, a gas sensor system with metal oxide semiconductor (MOS) gas sensors using temperature-cycled operation (TCO) is presented. The system has been tested in two different laboratories at the concentration range from 0.5 up to 10 ppb. The system is equipped with three gas sensors and advanced temperature control and read-out electronics for the extraction of features from the TCO signals. A sensor model is used to describe the sensor response in dependence on the gas concentration. It is based on a linear differential surface reduction (DSR) at a low temperature phase, which is linked to an exponential growth of the sensor conductance. To compensate for cross interference to other gases, the DSR is measured at three different temperatures (200, 250, 300 °C) and the calculated features are put into a multilinear regression (partial least square regression – PLSR) for the quantification of benzene at both laboratories. In the tests with the first set-up, benzene was supplied in defined gas profiles in a continuous gas flow with variation of humidity and various interferents, e.g. toluene and carbon monoxide (CO). Depending on the gas background and interferents, the quantification accuracy is between ±0.2 and ±2 ppb. The second gas mixing system is based on a circulation of the carrier gas stream in a closed-loop control for the benzene concentration and other test gases based on continuously available reference measurements for benzene and other organic and inorganic compounds. In this system, a similar accuracy was achieved for low background contaminations and constant humidity; the benzene level could be quantified with an error of less than 0.5 ppb. The transfer of regression models for one laboratory to the other has been tested successfully.
Citation: Sauerwald, T., Baur, T., Leidinger, M., Reimringer, W., Spinelle, L., Gerboles, M., Kok, G., and Schütze, A.: Highly sensitive benzene detection with metal oxide semiconductor gas sensors – an inter-laboratory comparison, J. Sens. Sens. Syst., 7, 235-243, https://doi.org/10.5194/jsss-7-235-2018, 2018.

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For detection of benzene, a multichannel gas sensor system was tested in two different laboratories at the concentration range from 0.5 ppb up to 10 ppb. A model is used to extract the channels and multilinear regression is done to compensate cross interference to other gases. Depending on the measurement conditions, the quantification accuracy is between ±0.2 ppb and ±2 ppb. Regression models for one laboratory were transferable between the labs under comparable measurement conditions.
For detection of benzene, a multichannel gas sensor system was tested in two different...
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