Abstract
In this paper, a liquid level control system was designed and fabricated. Control of the liquid level was accomplished by adjusting the sup-ply voltage to a centrifugal pump that is delivering the liquid from a reservoir tank to an upper tank. The liquid level control system was implemented on an ATmega328 microcontroller. Three control strategies are implemented, manual mode, ON/OFF controller, and PID controller. Serial communication is used to establish the communication between the ATmega328 and a computer running MATLAB soft-ware. A graphical user interface was constructed to allow users to interact with the system. The system model is obtained using an experi-mental approach. The obtained model is then used for the design of the PID controller. Experimental results are provided to highlight the performance of the implemented controllers.
Highlights
Liquid level control is a very common application in the process industry such as in food processing, pharmaceutical industry, water purification, chemical industry, and many more
The system is controlled with a custom designed graphical user interface (GUI) that allows for two control methods; namely, ON/OFF Controller and Proportional Integral Derivative (PID) Controller
This paper presents the development of an apparatus that demonstrates the concepts of automatic control of liquid level in a tank that is being randomly drained
Summary
Liquid level control is a very common application in the process industry such as in food processing, pharmaceutical industry, water purification, chemical industry, and many more. This paper presents the development of an apparatus that demonstrates the concepts of automatic control of liquid level in a tank that is being randomly drained. The developed automatic liquid level control system will be used as a teaching aid so that the vocational students at Abu Dhabi polytechnic can interact with a dynamic control system operating in real-time.
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