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Vol. 129, Issue 6, June 2011, pp.24-32





Design, Development and Calibration of a Portable Capacitive Moisture Meter

Mahmoud Soltani, Reza Alimardani

Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering & Technology, University of Tehran, Karaj, Iran

E-mail: mahmoodsoltani39@yahoo.com



Received: 30 April 2011   /Accepted: 20 June 2011   /Published: 30 June 2011

Handbook of Laboaratory Measurements book


Abstract: Dielectric properties of grains, fruits and vegetables are used in most fields of agriculture such as microwave drying treatment and precision agriculture. In this paper a portable instrument was designed and developed to predict moisture content of grains and seeds by measuring the dielectric constant of sample. A high correlation was observed between moisture content and dielectric constant. The best result was obtained at 1 MHz frequency. The system was calibrated for wheat, corn, millet, lintel, pea and black eyed pea. Fast response, cheapness and reliability are the main characteristics of this instrument.


Keywords: Capacitive sensor, Instrument, Moisture content


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