Related products

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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.

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  Process Control Eengineering

  Trainer For Field Bus Applications

  Field bus technology plays a key role in modern-day process automation. The field bus permits networking of terminal devices such as controllers, sensors or actuators in the plant system (field level) with the higher-level control room (control level). A network of this kind can be quite extensive; line lengths of as much as 1000 metres and more are possible.This benchtop trainer is used to teach the initial basic steps in field bus technology based on the example of Profibus DP. Various terminal devices (slaves) are activated and read by a PC with a Profibus DP interface (master). The required hardware is largely pre-configured. Students are able to concentrate on the software programming of the field bus system. The following specific topics can be covered: System configurator with DMF (Device Master File), bus topology, communication protocols, tags, OPC (OLE forProcess Control) server, input and output of process data, and much more. The unit includes a digital process controller as well as analogue and digital input and output modules with a Profibus DP interface. Two potentiometers permit the simulation of input signals for the controllers. A digital voltmeter displays the output signals. Digital signals are generated by switches and displayed by LEDs. The controlled variable, manipulating variable and reference variable data are delivered as standard signals at lab jacks, enabling the controllers to be incorporated into real processes at any time. Clearly structured instructional material outlines the fundamentals and provides a step-by-step guide through the exercises.

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  Process Control Eengineering

  Temperature Control Apparatus with Experimental Panels

  This instructional system is used to examine a simple temperature control unit. It consists of clearly arranged modular experimental panels which are suspended in a frame and connected with cables. A soldering iron equipped with a thermal element is used as the temperature control system. The temperature can be read on a digital display with a measuring transducer. The system includes a digital industrial controller which can be configured continuously as P, PD, PI and PID controller. It is possible to also use it as a two-point controller. The manipulated value can be indicated on a bar diagram. An electronic power control completes the system. The student has the opportunity to get familiar with the components of a control circuit, to interconnect them and vary their parameters. All components are of a sturdy design and therefore well suited for student experiments.