Automatic Self-Cleaning Filters: Omega Series

The Amiad Omega Series are automatic filters, with multiple screens operated by a common electric driven screen cleaning mechanism. The “Omega” filter flow rate range is up to 5,000 m³/h (22,000 gpm) and from 500-10 micron filtration degree. Inlet/Outlet flanged connections are available in the range of 200-800 mm (8”-32”).

The Filtration Process
Raw water enters from the filter inlet and passes through the multi-screens. Filtered water flows through the filter outlet. The gradual dirt buildup on the inner multi-screen’s surface causes a filter cake to develop, with a corresponding increase in the pressure differential across the multi-screens. A pressure differential switch senses the pressure differential and when it reaches a pre-set value, the self-cleaning process begins.

The Self-Cleaning Process
Cleaning of the filter is carried out by multiple suction scanners with an option for SLN (Spring Loaded Nozzles) which simultaneously scan the multi-screens by a common electric motor driven gear mechanism. The DP switch signals to open the exhaust valves creating a high velocity suction stream at the nozzle scanner tips which “vacuums” the filter cake from the multi screens.

During the self-cleaning process, which takes approximately 25 seconds, filtered water continues to flow downstream.

The Control System
The Omega’s operation and cleaning cycle is controlled and monitored by a Programmable Logic Control (PLC). The PLC allows maximum flexibility in control options and is provided with a wide range of control options from an independent stand alone controller to a fully integrated one with the customer’s central control system. During the self-cleaning cycle the PLC controls a solenoid that operates the exhaust valves by means of a hydraulic command or compressed air.