Abstract:
This paper describes an investigation into the effects of the temperature variations on capacitance measurements of the different chemical liquids using the charge and discharge method in a cylindrical capacitive sensor system. The capacitive sensor system is represented using a typical equivalent circuit model according to their electrode configuration and the type of the liquid between the electrodes. Variation of the reactance capacitance parameter of chemical liquids with the temperature in the range of 25-75oC is measure for different chemical liquids. The temperature variations of the capacitance for the cool Antifreeze, Ethanol, Oil and Consumed oil samples which are studied for 27-70oC are obtained. The results show an average variation of 3.54 μF/°C for the antifreeze, 4.56 μF/°C for the ethanol, 4.33 μF/°C for the oil, and 3.76 μF/°C for the consumed oil in warm up process to about 75°C . The cooling behaviors for the warm Antifreeze, Ethanol, and Oil and consumed oil samples are also investigated in this research. Average variations of 1.21 μF/°C for the antifreeze, 0.98 μF/°C for the ethanol, 1.07 for the oil and 0.78 μF/°C for the consumed oil are obtained for the high temperature range. Hence the reported capacitive sensor provides a relatively accurate method to determine the temperature dependence of the reactive capacitance for different chemical liquids and pure liquids.
Page(s):
439-446
DOI:
DOI not available
Published:
Journal: Science International, Volume: 25, Issue: 3, Year: 2013