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Vol. 116, Issue 5, May 2010, pp. 13-20




Design, Development and Testing of a Semi Cylindrical Capacitive Sensor for Liquid Level Measurement


*Sagarika PAL, *Rasmiprava BARIK

*Department of Electrical Engineering, National Institute of Technical Teachers’ Training and Research, Kolkata [Under MHRD, Govt. of India],

Block-FC, Sector-III, Salt Lake City, Kolkata-700106, India

E-mail: spal922@yahoo.co.in, rasmiprava_barik@yahoo.co.in



Received: 5 March 2010   /Accepted: 24 May 2010   /Published: 31 May 2010


Abstract: In the present paper a low cost noncontact semi cylindrical capacitive type liquid level sensor has been designed, developed and tested. The semi cylindrical capacitive sensor consisting of two thin semi cylindrical metal plates separated by a gap distance and mounted around a non conducting storage tank, has been used to measure the liquid level in the tank. The measured capacitance variation with variation of liquid level is linear and obtained in the nano farad range which again has been converted into voltage variation by using proper signal conditioning circuit. Since the sensor is noncontact type it can be used for both conducting and non conducting type of liquid contained within a non conducting tank. For converting the capacitance variation in to voltage variation a series R-L-C resonating circuit has been used instead of conventional bridge circuit. Experimental results confirm the satisfactory performance of the sensor for liquid level measurement.


Keywords: Liquid level sensor, Semi cylindrical capacitive sensor, Series R-L-C resonating circuit, Non-contact sensor, Signal conditioning circuit


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