Flow Level Control Demonstration Unit- Engineering Lab Training Systems

Technical Description The training system provides a comprehensive experimental introduction to the fundamentals of process control using an example of combined flow and level control. The level and flow rate can be regulated individually and as a cascade. In cascade mode the level is the primary controlled variable. The flow control then provides optimum adjustment of the controlled variable to the reference variable (setpoint).  All components are clearly laid out on a vertical panel. The large-format process diagram provides an aid to understanding. A pump transfers water from a storage tank into a piping system which contains a variable-area flowmeter. From there the water passes into the transparent process tank. The level is measured by an electronic pressure transducer installed at the base of the process tank. The controllers used are two state-of-the-art digital industrial controller. The actuator in the control loop is an electromagnetic proportional valve. Ball valves in the tank outlet and in the pipe system enable defined disturbance variables to be generated. The controlled variable X and the manipulating variable Y can be tapped as analogue signals at lab jacks. This enables external recording equipment, such as a plotter or an oscilloscope, to be connected.   An instrumentation and control software with interface module (USB) is available as an accessory. This enables the key process variables to be represented, and control functions executed. The well-structured instructional material outlines the technological fundamentals and provides a step-by-step guide through the experiments.