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Electrical Parameter and Permittivity Measurement of Water Samples Using the Capacitive Sensor

In this study, we reported the effect of frequency on the electrical parameter and permittivity of water samples using an invasive capacitive sensor. The measured capacitance, resistance and dissipation factor for distilled water, mineral water, tap water and salt water for different frequency is reported and results compared. Comparison of the measured capacitances for water samples shows a decrease by increasing the frequency. For salt water measured capacitance decrease from 7.98 µF to 4.11 µF when the frequency rise from 100 Hz to 2 Khz. The measured relative complex permittivity for distilled water in the frequency 100 Hz equal 29.41×10 and for salt water is 309.8×10 . This big difference is because of electrical conductivity (EC) 66 effects on the imaginary part of the relative complex permittivity. The imaginary part is increased by rising in the electrical conductivity. Our results show for water samples the relative complex permittivity is decreased by rising the frequency. Results show that the reported cylindrical capacitive sensor is a good tool to measure the electrical properties in the low frequency.