Maintenance / cleaning
FM/PC, FM-Case/PC, Filter/PC
10
ba76171e02
04/2019
•
Do not dismantle the filter plate (
Filter/PC
) from the frame (
FM-
Case/PC
).
4
Rinse off any coarse contamination with low water pressure (e.g.
with a watering can or wash bottle).
5
Then carefully remove the coating from the filter plate using the
soft special brush (scope of delivery
FM-Case/PC
). Normally it is
easy to see the brownish coating coming off while the lighter sur-
face of the filter plate appears.
NOTE
Do not press the special brush too firmly on the surface of the
filter plate and do not change the moving direction of the brush
(do not scrub).
6
After cleaning, check both sides of the filter plate for damage.
7
Thoroughly clean the special brush under running water, dry it
and store in a dust free place until the next use.
8
Submerse the cleaned filtration unit in the basin or channel.
9
Switch on the filtration pump with the Start key.
Restarting the
measuring operation
Carry out the general steps to restore the readiness to measure at the
analyzer (see operating manual of your analyzer, chapter Mainte-
nance).
5.3
Chemical cleaning
Chemical cleaning is recommended if mechanical cleaning no longer
achieves any significant improvement, i.e. the negative pressure on the
manometer no longer decreases significantly after mechanical clean-
ing.
In this case, the filter plate is blocked. The blockage is mostly organic
and can only be removed by chemical cleaning.
The chemical cleaning is carried out with the aid of a suitable container
(Filter-CL) for the cleaning bath. The amount of cleaning solution
required depends on the shape and size of the cleaning container.
Cleaning solution
In most cases, organic blockages can easily be removed with an aque-
ous sodium hypochlorite solution (chlorine bleaching agent, NaClO,
1 % active chlorine). In some cases, NaOH 4 % (sodium hydroxide) has
proven effective.
