Journal cover Journal topic
Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
J. Sens. Sens. Syst., 7, 349-357, 2018
https://doi.org/10.5194/jsss-7-349-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular research article
08 May 2018
A portable sensor system for bacterial concentration monitoring in metalworking fluids
Marco Grossi1, Carola Parolin2, Beatrice Vitali2, and Bruno Riccò1 1Department of Electrical Energy and Information Engineering “Guglielmo Marconi” (DEI), University of Bologna, Bologna, Italy
2Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
Abstract. The detection of bacterial concentrations in metalworking fluids (MWFs), oil-in-water emulsions used in the cutting industries for cooling and lubrication, is important in order to extend the product life-cycle and plan its disposal according to regulations and legislations. The standard method of measuring culturable bacterial concentration is the plate count technique (PCT) that, however, has long response times and is not suitable for automatic implementation outside a laboratory. In this paper a portable sensor system that measures the bacterial concentration in liquid and semi-liquid media exploiting impedance microbiology is presented and tested for the application of MWF microbial monitoring. A set of MWF samples, taken from metalworking plants, have been tested and good agreement has been found between the system response and that of the PCT. The proposed system allows automated bacterial concentration measurements with shorter response times than the PCT (4 to 24 h vs. 24 to 72 h) and is suitable for in-the-field MWF monitoring.
Citation: Grossi, M., Parolin, C., Vitali, B., and Riccò, B.: A portable sensor system for bacterial concentration monitoring in metalworking fluids, J. Sens. Sens. Syst., 7, 349-357, https://doi.org/10.5194/jsss-7-349-2018, 2018.

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The paper presents a portable sensor system that measures the bacterial concentration in metalworking fluids (MWFs) exploiting impedance microbiology. Good agreement has been found between the system response and that of the reference plate count technique (PCT). The proposed system allows automated bacterial concentration measurements with shorter response times than the PCT (4 to 24 h vs. 24 to 72 h) and is suitable for in-the-field MWF monitoring.
The paper presents a portable sensor system that measures the bacterial concentration in...
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