SMART OIL AND CONDUCTIVITY SENSOR FOR WATER QUALITY MONITORING

M. Dias Pereira, O. Postolache, P. Girão, Helena Ramos

Abstract

This paper presents a smart sensor designed for oil-on-water thickness and water conductivity measurements. Basically, the proposed sensing devices include a capacitive element used to measure oil thickness and a conductivity element to measure water conductivity. Temperature compensation of measured values is also provided by including an additional temperature sensor in the system. The main characteristics of the smart sensor system include pulse-width modulation of sensors’ output signals, auto-calibration capability and temperature error compensation. Field applications are not restricted to environmental monitoring and can include wastewater treatment plants, oil quality measurement and measurement of oil quality in fluid systems and hydraulic components. Some experimental results are also presented in this paper.

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IMEKO-TC4-2004-074.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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