A circuit with a graduated transparent tank is provided for the control of flow rate, level and pressure. Two actuator possibilities are included for use, namely, a variable-speed pump and a pneumatic control valve. A heating circuit with a heater, heat exchanger and pump is provided for temperature control. Two forms of cascade control are possible. The level in the tank can be controlled by way of the flow rate. The temperature in the heating circuit can be controlled by way of the flow rate through the heat exchanger. For these two cascade controls, either the pump or the control valve can be used as the actuator. The temperature can be controlled using the heater as the actuator, or by way of the flow of cooling water through the heat exchanger. Sensors provide for measurement of the controlled variables. The variables can also be read-off directly from analogue meters. A paperless recorder is provided to record the control processes. A disturbance variable can be generated by a valve in the tank outlet for level and pressure control. A valve at the tank head also permits investigation of level control with and without counter pressure. This enables the trainer to be controlled by way of a process control software. The software also permits recording of the process variables and parameterization of the controller on the PC.

Specification

Circuit with collecting tank, graduated tank, pneumatic control valve and multistage variable-speed centrifugal pump

1 flow meter, 2 manometers and 4 thermometers for direct display

Control of level, flow rate, pressure, temperature and cascade control

Parameterizable controller with 4 selectable control loops

Three-channel paperless recorder

Heating circuit with heater, pump, expansion vessel and heat exchanger

Sensors for measurement of the controlled variables; level, flow rate, pressure and temperature

Heater, pneumatic control valve and multistage variable-speed centrifugal pump as actuators

Technical data:

Tanks

Graduated tank: approx. 6L

Head: approx. 59m

Collecting tank: approx. 90L

Multistage centrifugal pump

Flow rate: approx. 75L/min

Heating circuit pump

Flow rate: approx. 50L/min

Head: approx. 3,5m

Heater power output: approx. 2kW

Controller parameterizable as

P, PI or PID controller

Switching controller

Measuring ranges

Level: 0…700mm

Temperature: 1x 0…60°C, 3x 0…120°C

Flow rate: 0…4000L/h

Pressure: 1x 0…6bar, 1x 0…10bar

230V, 50Hz, 1 phase

230V, 60Hz, 1 phase; 230V, 60Hz, 3 phases

LxWxH: 2260x800x1990mm

Weight: approx. 250kg.