SAF - 1500 910101-000102
07.2109
Page 10 of 26
DESCRIPTION OF FILTER OPERATION
Filtering process:
The SAF-1500 is a sophisticated yet easy-to-operate automatic filter, with a self-cleaning mechanism driven by an electric
motor. The SAF-1500 is designed to work with various types of screens in filtration degrees from 500 to 10 micron, and is
available in 2", 3" and 4" inlet/outlet diameter.
The filter is available in "In-Line" configuration as well as in "Modular" configuration.
The water enters through the inlet pipe into the coarse screen from outside in, and through the fine screen from inside out.
The "filtration cake" accumulates on the fine screen surface and causes head loss to develop.
The coarse screen is designed to protect the cleaning mechanism from large dirt particles. It should not accumulate large
quantities of suspended solids and is not cleaned automatically.
Self-cleaning process:
The SAF 1500will start the self-cleaning process when the pressure differential across the screen reaches a pre-set value or a
predetermined lapse of time.
Cleaning of the filter element is carried out by the suction scanner which rotates in a spiral movement while removing the
filtration cake from the screen and expels it out through the exhaust valve.
The rotation of the scanner is operated by a 2-way (fwd/rev) drive unit that is attached to the scanner by a threaded shaft
which provides the linear movement.
The exhaust valve is activated for the duration of the cleaning cycle by a 3-way solenoid. During the self-cleaning process,
which takes approximately 20 seconds, filtered water continues to flow downstream.
Different modes of filtration:
The filtration system may be found in one of the following modes:
1.
Filtering mode:
This is the normal function condition. Flushing is not occurring and the power light on the control board is lit.
2.
Flushing mode:
A mode in which the flushing process is in progress. The motor and exhaust valve are operating according to
the program.
3.
Continuous flushing mode:
It is possible to activate the self-cleaning mechanism continuously by changing the switch near the
timer in the control board to "CONT." position.
4.
Malfunction mode:
During malfunction mode the self-cleaning operation is stopped, the malfunction light on the control
board is turned on and an external output is activated with 24V AC.
Water Outlet Junction Box
Water Inlet
Control Filter
Exaust Valve
Drive Unit
Pressure Differntial Switch