Abstract
The control of liquid flowrates finds many applications in chemical process plants as well as other industrial applications. This paper investigates the design and implementation of a complete microcomputer-based system for the control of flowrate of liquids flowing out of a free surface tank (with no inlet flow) to a required preset value, regardless of the rate of drop-change in the liquid level in the tank occupied by the liquid. The system comprises a multispeed DC motor-driven centrifugal pump used for flowrate regulation, and an ultrasonic liquid-level measuring system, controlled by an SDK-85 microcomputer based on an Intel-8085 microprocessor. Experimental results are tested successfully for water as a sample liquid for flowrates of 15, 20, 251 hr−1 successively.
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