Vol. 120, Issue 9, September 2010, pp.27-37

Contactless Quality Monitoring Sensor Based on Electrical Conductivity Measurements

¹Armin SATZ, ¹W. GRANIG, ²D. TUMPOLD and ¹F. REININGER

¹ Infineon Technologies Austria AG, Siemensstrasse 2, 9500 Villach, Austria

² KAI GmbH, Europastarße 8, 9524 Villach, Austria

E-mail: Armin.Satz@infineon.com

Received: 20 August 2010   /Accepted: 14 September 2010   /Published: 27 September 2010

Abstract: A first prototype of a contactless conductivity sensor for AdBlue^® quality monitoring is presented. Based on a detailed sensor mode analysis it is shown that capacitive sensors can be designed to sense electrical liquid conductivity. The sensor design process is based on a sensor model, which allows simulating capacitive senor responses for arbitrary electrode and liquid tank geometries. Finally, temperature induced errors are estimated.

Keywords: AdBlue^® quality monitoring, Contactless conductivity sensor, Sensor modeling

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