Process Control Eengineering
Showing 25–36 of 40 results
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Process Control EengineeringStirred Tank Test Stand
This demanding test stand is used to perform experiments on a multivariable system often found in practice. In this particular example, the interacting variables temperature and level are to be controlled in a stirred tank. After the heated product leaves the stirred tank, heat is transferred to the feed by a heat exchanger. A pneumatic control valve controls the tank level via product discharge. The double-walled tank is electrically heated. The system has a closed water circuit. The test stand contains high quality instrumentation. The controllers have a Profibus DP interface which allows the test stand to be monitored with optional process control software . This software can also be used to record the process variables and to tune controller parameters via PC.
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Process Control Eengineering
Stirring
During stirring, the continuous phase is liquid. With , the production of solutions (solid dissolved in liquid), emulsions (mixture of non-inter-soluble liquids) and suspensions (insoluble solid in liquid) can be investigated. Mixing takes place in a tank which is resistant to chemicals and heat-resistant. With the high-performance stirring machine even high-viscosity mixtures can be produced. The speed is adjustable. The torque is indicated on the unit’s digital display. This enables the power demand to be determined. 9 different, easily interchangeable stirrers are provided. With a plastic which is dispersed in the water it is possible to observe the characteristic flow fields of the different stirrer types. Flow impeders can be inserted in the tank to investigate their influence on the mixing process. To determine the mixing time and mix quality of solutions, a conductivity meter is available. The device can also be used to measure temperatures.A removable tube coil serves as a heat transfer medium. It can be used for heating or cooling with water from the laboratory supply. A valve with precise adjustment is used to adjust the flow rate. This enables the influence of mixing processes on heat transfer to be investigated.
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Process Control Eengineering
Suspension Production Unit
Provides the experimental filtration units with a suspension of diatomite and water (recommended). It is prepared in the stirred tank. The stirrer ensures that the solid remains suspended and does not settle. An eccentric screw pump delivers the suspension to the connected experimental unit. The pump rotor is made of stainless steel. It runs inside an elastomer housing. A manometer indicates the delivery pressure. A pressure cut-out switch stops the pump if the pressure is too high. A temperature transducer protects the pump from running dry. The speed of the pump can be adjusted on a potentiometer. The stirred tank features a level indicator and three flow impeders. All necessary connecting elements are supplied to connect the supply unit to the relevant experimental filtration unit.
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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.
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Process Control Eengineering
Temperature Control Trainer
This teaching and training system provides a comprehensive experimental introduction to the fundamentals of process control using an example of temperature control.A circulating pump transfers water within a closed circuit. The flow of water can be regulated by a hand-operated valve. The loop also contains a screw-in heater, a heat exchanger with fan, and three integrated thermocouples for temperature measurement. Dead times can be represented by the use of different lengths of process delay. A thyristor power controller is used as the actuator. The controller used is a state-of-the-art digital industrial controller. It can be configured as a continuous or a switching device, and can activate the heater via the actuator and / or the fan. 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. A process control software is optionally available. The software permits the construction of a complete networked system comprising multiple trainers from the series. The key process variables can also be represented, and control functions executed.
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Process Control Eengineering
Test Stand for Control Valves
Control valves are an essential part of process and chemical engineering. The connection between controller and plant is realised with control valves as actuators. Control valves are usually used to regulate flows of gases or liquids. Optimum control loop design depends on a sound knowledge of control valve behaviour as well as a knowledge of the controlled system’s response. This mobile test stand allows to investigate and study control valves of different types. For this purpose the valve is installed in a closed water circuit with a pressure pump and a supply tank. Flow rate and pressure drop across the valve are measured. The trigger signal is generated by potentiometers and indicated on a display. Electrically operated motor valves can be investigated as well as pneumatic control valves. A data acquisition system can be used to record and evaluate characteristics and step responses on a PC.
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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
Trainer for Controller Tuning
This benchtop trainer deals with the interaction between controller and controlled system, the objective being for the closed control loop, comprising the controller and the controlled system, to exhibit the desired optimum response. The setting of controller parameters – a key practical aspect – can be practised safely and intensively using simulation software. Concepts such as open and closed loop control, stability, step response, disturbance and control response are clearly demonstrated. This principle is in widespread application in product development in industry and is known as Hardware in Loop (HIL). All major types of controlled systems can be selected in the program. The system parameters can be set within broad limits so that – unlike actual controlled systems – extreme parameter situations can be investigated. The time response can be recorded and analysed using the software. The controller and the PC are connected by a data acquisition card with AD and DA converters. The process controller that is used can be easily configured from the PC across an interface using the software provided. Clearly structured instructional material outlines the fundamentals and provides a step-by-step guide through the exercises.
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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
Trainer For Industrial Controllers
This trainer familiarises students with the operation and function of a state-of-the-art industrial process controller. The controller has freely accessible inputs and outputs. Defined input levels and step signals can be produced with a signal generator. A digital voltmeter is used to measure the input and output signals. A simple first order lag is simulated to allow the response and stability of a closed control loop to be investigated. All signals are accessible via lab jacks so a standard x/y plotter or line recorder can be used. It is also possible to control external system models with this controller. As well as manual configuration and parameter setting with keys, the controller can be configured (configuration software supplied) from a PC over an RS232 interface. Clearly structured instructional material sets out the fundamentals and provides a step-by-step guide through the exercises.
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Process Control Eengineering
Training System Flow Control
This compact teaching / training unit offers every opportunity to learn the fundamentals of process control through experimentation on a flow control system. The experimentation set-up is mounted in a solid housing which accommodates all the electronics. A piping system with two flowmeters is supplied with flow by a speed-controlled pump from the transparent storage tank. The variable-area flowmeter offers the advantage that the flow can be observed directly at any time. The rate of flow is measured by a turbine wheel flow transducer. The transducer output signal is sent to the software controller. The output signal from the controller influences the setting of an electromagnetic proportional valve. To investigate the influence of disturbance variables, the pump speed can be altered by way of 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 unit 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.
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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.