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Monitoring of cleaning processes with an impedimetric sensor

: Endres, H.-E.; Hammerl, E.; Drost, S.; Menner, M.; Pfeiffer, T.

AMA Service GmbH, Wunstorf:
Sensor 2003. 11th International Conference. Proceedings. Vol.1
Wunstorf: AMA Service GmbH, 2003
International Conference Sensor <11, 2003, Nürnberg>
Conference Paper
Fraunhofer IZM ()
Fraunhofer IVV ()
capacitive transducer; interdigitated electrode; multivariate signal evaluation; CIP cleaning

Fouling layers on hot surfaces in food processing lines have frequently to be cleaned. Up to now, an inline monitoring of the cleaning process does not exist. Therefore, the cleaning is based on empirical knowledge and occasional optical inspections. The article presents a planar capacitive sensor together with an impedance spectroscopic measurement method and a multivariate signal evaluation to monitor the cleaning process. The result of the signal evaluation is a numerical cleaning indicator, which shows the progress of the cleaning. A steady state of the cleaning indicator signals the end of the cleaning proc-ess. First results, obtained in a laboratory model of a heat exchanger, were presented. A reduction of the cleaning time in industrial plants up to 50 % is expected.