5.4.3. Cleaning filter elements
¥
By compressed air (Wear goggles)
For the purpose, the air gun should be fit-
ted with a nozzle extension which is bent
90
û
at the discharge end and which is long
enough to reach down inside to the bottom
of the element.
Moving the air gun up and down, blow out
the element from the inside (maximum
500kPa - 5 bar) until no more dust comes
out of the filter pleats.
¥
By washing
Before washing, the element should be
precleaned by means of compressed air,
as described above.
Then allow the element to soak in luke-
warm washing solvent for 10 minutes, and
then move it to and for in the solvent for
about 5 minutes.
Rinse thoroughly in clean water, shake out
and allow drying at room temperature. The
cartridge must be dry before it is reinstalled.
Never use steam sprayers, petrol (gaso-
line), alkalis or hot liquids etc. to clean the filter elements.
¥
Knocking out dirt by hand
In emergencies, when no compressed air or cleaning agent is available, it is possible to clean
the filter cartridge provisionally by hitting the end disk of the cartridge with the ball of oneÕs
thumb.
Under no circumstances should the element be hit with a hard object or knocked against a
hard surface to loosen dirt deposits.
¥
Checking the filter cartridge
Before reinstalling the cartridge, it must be
checked for damage e.g. to the paper
pleats and rubber gaskets, or for bulges
and dents etc. in the metal jacket.
Cracks and holes in the paper pleating
can be established by inspecting the car-
tridge with a flashlight.
Damaged cartridges should not be reused
under any circumstances. In cases of doubt,
discard the cartridge and install a new one.
- 34 -
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