Related products

• 
  Process Control Eengineering

  Training System Level Control

  This compact teaching / training unit offers every opportunity to learn the fundamentals of process control through experimentation on a level control system. The experimentation set-up is mounted in a solid housing which also accommodates all the electronics. The transparent process tank is fed from the storage tank with the aid of a speed-controlled pump. The liquid level is measured using a pressure transducer. The transducer output signal is sent to the software controller. The controller’s output signal influences the speed of the pump motor and therefore delivery flow rate. To investigate the influence of disturbance variables, an electromagnetic proportional valve in the tank outlet can be activated by the software. The powerful state-of-the-art software is an integral part of the training system, embodying the principle of hardware/software integration (HSI). It enables the experiments to be conducted and evaluated in a user-friendly manner. The software has network capability. The link between the training system and the PC is made via a USB port. The clearly structured instructional material sets out the technological fundamentals and provides a step-by-step guide through the experiments.

• 
  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.

• 
  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.

• 
  Process Control Eengineering

  Nutsche Pressure Filter

  Nutsche Filters are used for discontinuous cake filtration of suspensions with high solid concentrations. The suspension production unit produces a suspension of diatomite and water and delivers it from above into the Nutsche Filter. In the bottom flange of the Nutsche Filter is a recessed sieve base with a filter cloth. A growing filter cake accumulates on the filter cloth made from the separated solid material. The applied pressure in the top section of the Nutsche Filter pushes the filtrate through the filter cake and the filter cloth. It is collected in the bottom section of the tank. After filtering, the filter cake obtained is washed with a washing liquid (water) and is then dried by an air stream.