Regulation of level and flow rate by PID
It groups two types of regulation:
• Regulation by PID of water level with 4-20mA hydrostatic pressure sensor.
• Regulation by PID of water flow rate with 4-20mA analogue flowmeter.
Thanks to a jumper set, the student selects the type of regulation required. They can then enter the set point value directly on the PID regulator. This, thanks to a speed drive, automatically adjusts the speed of rotation of the motor pump to control the flow rate or the water level according to set point value. The different signals used in the regulation system are analogue 4-20mA. It is fully autonomous and operates in a closed circuit as soon as the bottom tank is filled with water.
Educational objectives
• Putting an electrical installation into service.
• Learning about and using a PID regulator, a hydrostatic sensor, and a 4-20mA flowmeter.
• Using a regulation system for water level and flow rate by analogue signal 4-20mA.
• Using and configuring a speed variator locally and from programming software.
• Measuring, analysing and interpreting analogue signals.
• Learning industrial maintenance.
Composition
Frame made of matt anodized aluminium mounted on four casters, two with brakes.
Easy to move and very stable.
• A bottom tank of 100L.
• One top tank of 60L with 2 transparent sides.
One tape rule on one side for monitoring the water level.
One inner wall of the tank for preventing eddies.
• One three-phase motor pump 230V/400V with a power of 750W.
• One rotary valve for manually adjusting the water flow rate at the pump outlet.
• One rotary valve for adjusting the water leak level at the tank outlet.
• One ¼ turn valve for rapid draining of the tank.
• One 4-20mA flowmeter with integrated digital display.
Pushbuttons on the front of the sensor enable its programming.
• One hydrostatic pressure sensor 4-20mA directly mounted on the tank wall.
Measuring range 0-600mm.
• One electrical console composed of:
1 thermal-magnetic circuit-breaker - 1 emergency stop button - 1 main On/Off button
1 speed variator 3x230V.
1 PID regulator 4-20mA with integrated programming console and large display
2 230V sockets with indicator light
1 set of safety terminals for selecting the type of regulation to be studied
1 set of safety terminals for measuring analogue currents
• Melamine shelf with dimensions 1000 x 400 mm.
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It groups two types of regulation:
• Regulation by PID of water level with 4-20mA hydrostatic pressure sensor.
• Regulation by PID of water flow rate with 4-20mA analogue flowmeter.
Thanks to a jumper set, the student selects the type of regulation required. They can then enter the set point value directly on the PID regulator. This, thanks to a speed drive, automatically adjusts the speed of rotation of the motor pump to control the flow rate or the water level according to set point value. The different signals used in the regulation system are analogue 4-20mA. It is fully autonomous and operates in a closed circuit as soon as the bottom tank is filled with water.
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