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A New Liquid Level Sensor for Process-Control Applications

Menon, KAP and Hariharan, R (1979) A New Liquid Level Sensor for Process-Control Applications. In: Transactions on Instrumentation and Measurement, 28 (2). pp. 155-158.

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Many process-control systems are air-operated. In such an environment, it would be desirable and economical to use pneumatic sensors. Bubble-back pressure sensors perform quite satisfactorily, but in case of viscous inflammable and slurry-like liquids with a tendency to froth, this level sensor is inadequate. The method suggested in this paper utilizes a pneumatic capacitor, one boundary of which is formed by the liquid level, to modulate a fluid amplifier feedback oscillator. The absence of moving parts and economy obtained makes this method attractive for process-control applications. The system has been mathematically modeled and simulated on an IBM 360/44 digital computer. Experimental values compare fairly well with the theoretical results. For the range tested, the sensor is found to have a linear frequency variation with the liquid level Extended running in the laboratory shows that the system is very reliable. This system has been found insensitive to temperature variations of up to 15ðC.

Item Type: Journal Article
Publication: Transactions on Instrumentation and Measurement
Publisher: IEEE
Additional Information: Copyright 1979 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre: Division of Electrical Sciences > Computer Science & Automation
Date Deposited: 27 Dec 2010 05:37
Last Modified: 29 Oct 2018 15:33
URI: http://eprints.iisc.ac.in/id/eprint/34260

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