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  Process Control Eengineering

  Test Stand for Level Pressure Control

  This high quality test stand enables to perform complex experiments on a multivariable system often used in practice. In this particular case, a vacuum degassing model is used as an example of an interacting two-variable control system. Vacuum and level are the two variables to be controlled in a process tank. Pressure and level are interdependent variables. The system has a closed water circuit. The vacuum is generated by a waterjet pump with its own water circuit. Two pneumatic control valves control vacuum generation and discharge from the tank. The test stand contains high quality instrumentation. The controllers have a Profibus DP interface. This interface allows the test stand to be monitored by optional process control software . This software can also be used to record process variables and to tune controller parameters via PC.

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  Process Control Eengineering

  Pressure Control Trainer

  This teaching and training system provides a comprehensive experimental introduction to the fundamentals of process control using an example of pressure control. The air pressure control system is a 2nd order system. It comprises two in-line pressure vessels interconnected by a restrictor valve. An additional valve on the second tank makes air tapping possible and so can be used to simulate a disturbance variable. A pressure transducer mesaures the pressure in the second vessel. The controller used is a state-of-the-art digital industrial controller. The actuator in the loop is a pneumatically operated control valve with a standardised current signal input. The controlled variable X and the manipulating variable Y are plotted directly on an integrated 2-channel line recorder. Alternatively, the variables can be tapped as analogue signals at lab jacks on the switch cabinet. This enables external recording equipment, such as an oscilloscope or a flatbed plotter, to be connected.

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  Process Control Eengineering

  Gas Flow Classification

  Zigzag sifters permit classification of solid compounds. The solid compound being separated is charged into the feed hopper. The compound is fed into the zigzag duct of the sifter at mid-height by way of a vibrating trough. An air stream flows upwards through the vertical duct. Depending on the geometry and density of the particles, they are carried along by the air or drop down due to gravity. At every bend in the duct the solid compound passes through the air stream and falls onto the opposite wall of the sifter. This corresponds to one sifting stage. Owing to the flow conditions, a vortex wake is formed between two bends of the zigzag duct. It ensures that the solid matter moves roughly perpendicular to the airflow. In this way, a transverse sift takes place at every bend. Sequencing of large numbers of such stages results in very fine separation. features a 20-stage zigzag duct. Transparent material provides optimum observation of the processes in the duct. A fan generates the airflow. The airflow rate and the solid mass flow are adjustable. The fine material transported upwards with the air stream is separated by a cyclone. Pressure measurement points at the relevant positions in the trainer enable to determine the pressure loss. Sand in different particle sizes is recommended for use as the feed material. For particle size analyses of the feed and of the coarse and fine material, a balance and a screening machine are recommended.

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  Process Control Eengineering

  Pressure Control Demonstration Unit

  This training system provides a comprehensive experimental introduction to the fundamentals of process control using an example of pressure control. All components are clearly laid out on a vertical front panel. The large-format process diagram provides an aid to understanding. The controlled system is operated by compressed air, which must be provided by the laboratory. The use of two in-line pressure vessels permits a 2nd order control system to be constructed. Disturbances can be generated by alternate air tapping by way of a hand-operated valve. Both pressure vessels are fitted with manometers. An electronic pressure transducer measures the pressure. The controller used is a state-of-the-art digital industrial controller. The actuator in the control loop is an electro-pneumatic control valve. 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.