Industrial type components are educationallyadapted by using a modular panel system to permit the step by step assemblingfrom the simplest circuit to the most complex system. This laboratory is designed for the study of the temperaturecontrol application to allow the student a practical training, based on theperformance of guided experiments.
With this laboratory it is possible to perform the followingexperiments:
The two position controller with delayed feedback in thetemperature process
The two position controller with elastic feedback in thetemperature process
The two position controller in the temperature process
P, PI and PID controls of the temperature process using theCHR method
The three range controller in the temperature process.
The unit provides students with the opportunity of investigating the effects of a change of controller parameters (proportional band, integral and derivative times) on the control capability of the system. The Temperature Control Apparatus illustrates the control of temperature in a simulated reactor vessel by controlling the supply of coolant (air) in response to changes in process conditions. The unit is made up of typical items of control equipment currently used in industrial applications, thereby providing an excellent opportunity for familiarisation.
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Temperature Control And Regulation Study Unit makes it possible to analyse the behavior of a control loop where the controlled quantity is the temperature of aliquid in a tank. Students may test out the use of different types of regulators, as are currently employed in industrial applications, and thetests can be performed in highly realistic conditions, as the system is entirely made of industrial quality components. Temperature control is one of the main problems encountered in factory automation and process control. It is also extremely interesting for teaching purposes, because temperature varies very slowly over time and therefore makesit possible to apply different control techniques and to assess the effects of the control parameters involved. It is suitable to an interdisciplinary laboratory, because it includes mechanical, chemical, electronic and EDP contents. With this trainer, all the tests can be performed through a Personal Computer and a special software for Windows.
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Application:
Characteristics of the heater
ON OFF control of the temperature
Closed loop proportional integral control of the temperaturev
Characteristics of the temperature sensor
Closed loop proportional control of the temperature.
A halogen lamp represents the heating element; a fan and a shutter valve allow, a PTC sensor provides the feedback signal; besides the reaching of a uniform temperature within given safety limits, also the insertion of noise variable. Temperature Control System represents a process for the control of the temperature, suitable for analysing continuous and discontinuous closed loop control systems.
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Primary circuit with electrically heated tank, pump control valve, rotameter
Secondary circuit with fresh water connection, temperature transducer, rotameter
Experimental unit for control engineering experiments
Control valve: electromagnetic proportional valve
Digital industrial controller, freely parameterisable
Large process schematic on front panel
Temperature control with plate heat exchanger and 2 water circuits
Process variables X and Y accessible as analogue signals via lab jacks
Ball valve to generate disturbance variables in fresh water circuit
Plate heat exchanger, 30 plates.
The board is supplied complete with a set of stackable, plug-in cables of suitable lengths and colours and with a training manual.
Together with the board, that contains the power circuits complete with relevant piloting, it is possible to realize an open and closed loop control both of the lighting system (24V, 15W lamp and photoresistor) and of the heating system (47, 25W heating element and integrated circuit sensor).
This board contains two independent systems, for the control of the light and of the temperature respectively, each one complete with reference block, error amplifier, transducer and actuator.
Power supply: 15Vdc, 100mA
Experiments:
Full-wave triac control
Proportional control
AC operated lamp
DC operated lamp.
Trainer for control engineering experiments
Temperature measurement with thermocouples at multiple points
Generation of disturbance variables by ball valve with scale in water circuitv
Screw-in heater with dry-running protection and temperature limiter Air/water heat exchanger with fan
Process variables X and Y accessible as analogue signals via lab jacks
Thyristor power controller as actuator
Digital controller, configurable as switching or continuous controller
2-channel line recorder
Temperature control process, equipped with standard industrial components
Water circuit with pump, heater and 2 different lengths of process delay.
This board is an option to the board since it uses its oven, the heating element and the temperature transducers. This board includes two reference signal generators, a comparison node and the three terms network (proportional, integral and derivative). The board is supplied complete with a set of stackable, plug-in cables of suitable lengths and colours and with a training manual. Complete with digital temperature indicator 100mV/°C.
Power supply: ± 15Vdc, 100mA and +5Vdc, 150mA
Investigation of a temperature control loop
Power controller as actuator
Parameterisable digital industrial controller
2 metal plates with differing thermal conductivities for disturbance generation
Thermocouple type K as temperature sensor
Soldering iron as controlled system
Transducer for thermocouple with digital temperature display
Bar display for manipulating variable
Control loop components on panels allowing for variation in installation in frame.
Heating and cooling by Peltier element
Temperature sensors at 3 different points along axis of bar to establish thermal lags
Experimental unit for control engineering experiments
Temperature control of a heated metal bar
Process schematic on front panel
Software activated fan to generate disturbance variables
Software-based controlled system simulation.
