Xylem YSI Alyza IQ NH4, Руководство по эксплуатации

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Alyza IQ NH4 Maintenance and cleaning
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Restarting the
measuring
operation
5.7.2 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,
 103.
Prepare the cleaning solution according to the following table. It can be mixed in
the cleaning container.
If the contamination cannot be removed with the mechanical clean-
ing, carry out the chemical cleaning (see section 5.7.2 Chemical
cleaning of the filter plate,
 119).
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 till the next use.
8 Remount and secure the cleaned filter module on the slide.
9 Submerse the filtration unit in the basin or channel.
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
.