Level and flow-rate control plant

The equipment consists of a glass column fed by a centrifugal pump connected with a storage tank. Another centrifugal pump makes the water recirculate from the column to the tank.
The flow rate of the water entering the column can be controlled by a pneumatic valve inserted in the discharge of the feed pump, whereas the level in the column can be controlled by a pneumatic valve inserted in the discharge of the recirculation pump.
A control and data-acquisition software (SCADA) for Windows enables the supervision of the system from a PC connected via the serial cable of the equipment.