Alyza IQ PO4
Maintenance and cleaning
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Restarting the
measuring
operation
5.6.2 Chemical cleaning of the filter plate
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 cleaning.
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 aqueous sodi-
um hypochlorite solution (chlorine bleaching agent, NaClO, 1 % active chlorine).
In some cases, NaOH 4 % (sodium hydroxide) has proven effective.
In the event of calcification, diluted hydrochloric acid (HCl) is recommended
(0.01 mol/l HCl, 0.036%, pH 2).
Preparing the
cleaning solution
The cleaning solution can be made from different detergent concentrates by di-
luting with water. A selection of possible detergent concentrates is given in the
section 5.3 Replacement parts, accessories,
Prepare the cleaning solution according to the following table. It can be mixed in
the cleaning container.
10
Switch on the filtration pump with the Start key.
11
Restart the Alyza IQ and switch off the maintenance condition at the
IQ S
ENSOR
N
ET
.
Base solution
Preparation instruc-
tions
Yield
Household hygienic cleaner
based on sodium hypochlorite
Add so much water to
1.5 l hygienic cleaner
that the volume is 6 l
6 l
Techn. sodium hypochlorite
solution (13 % active chlorine)
Add so much water to
300 ml solution that the
volume is 5 l
5 l
WARNING
Dangerous chemicals.
Improper use of chemicals can cause damage to your
health.
Heed the following rules:
Read the labels of the ChemBags and follow the safety
instructions
Wear protective equipment (lab coat, protective gog-
gles, chemical resistant protective gloves)
Summary of Contents for WTW Alyza IQ PO4
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