Flow & Level Control

E6.3.1.2

System

The experiments are set up with experiment plates in profile frames. The controlled system or control circuit are activated with the Profi-CASSY and the relevant measurement values recorded.

Objectives

Get familiar with the basic principles of controllers
Setpoint and disturbance control
Handle analysis and simulation software

Function
The liquid control system is comprised mainly of a pump as well as holding and measuring tanks. The inflow and outflow of liquids can be manipulated using two valves. The device contains an impeller wheel flowmeter with subordinate flow controller. An immersion pipe with pressure sensor records the fill level in the measuring tank and converts it into an electric signal for the fill level. The measured variables for flow rate and fill level are displayed on 7-segment displays. The digital liquid control system is characterized by a very compact build. It is delivered complete with all sensors and operation equipment and needs very few accessories.

Method
The equipment is ideal for demonstration and students' experiments. The tests were carried out with an electronic manual and the data files for CASSY Lab 2 and WinFACT. It is true Plug & Play: The measurement starts automatically after loading the data file.

Target groups
Students completing vocational training in electrical engineering the industry and students of automation engineering and mechatronics are the target group. The course offers introductory experiments that are very simple and also addresses difficult topics for bachelor-level studies.

Topics

Control design through pole-zero compensation
Determination of the controller gain Kp from a batch run
Control unit design through numerical optimization
Rule of thumb method
Digital liquid controlled system
Flow measurement
Step jump response of the flow system
Flow controlling
Flow regulation at the stability limit
Follow-up control for flow with ZN-optimised controller
Disturbance behaviour of flow controlling
Flow controlling with block-oriented PC simulation
Characteristics of the fill level system
Fill level measurement
Integral and PT1 behaviour of the fill level system
Static identification of the fill level system
Software-assisted controller selection
Setpoint controlling of the fill level
Disturbance control of the fill level
Fill level controlling with a two-point controller
Fill level controlling with PC simulation

Similar figure

1	734 011 4	Two position controller
1	734 02 8	Reference variable generator
1	734 064N 8	PID digital controller net
1	734 265 8	Digital Liquid Controlled System
1	524 016S2 8	Profi-CASSY Starter 2
1	726 09 4	Panel frame T130, two-level
1	726 86 4	Stabilised power supply unit ±15 V / 3 A
2	500 59 8	Safety bridging plugs, black, set of 10
1	500 592 8	Safety bridging plugs with tap, black, set of 10
3	500 641 8	Safety experiment cable, 100 cm, red
3	500 642 4	Safety experiment cable, 100 cm, blue
3	500 644 8	Safety experiment cable, 100 cm, black
1	775 681DE 4	LIT-print: Flow and Level Control, German
1	775 681EN 4	LIT-print: Flow and Level Control
1	775 681FR 4	LIT-print: Flow and Level Control, french
1	734 501 4	WINFACT LD Starter (one computer)
1	726 10 4	* Panel frame T150, two-level
1	734 502 4	* WINFACT LD Starter (site license)
1		additionally required: 1 PC with Windows 7 / 8.1 / 10 (x86 or x64)

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

Flow & Level Control

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