Xylem YSI Alyza IQ NH4, Руководство по эксплуатации

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Maintenance and cleaning Alyza IQ NH4
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tion of the filtration unit.
 With a delivery height of approx. 2 m and a new filter plate, the negative pres-
sure is approx. -0.3 bar.
Every meter of delivery height increases the negative pressure by approx. -
0.1 bar.
If the negative pressure increases by a further -0.3 ... -0.4 bar with time, the
filter plate is covered with solid matter from the sample and has to be cleaned.
 If, after the mechanical cleaning, there is still negative pressure, a chemical
cleaning is required, or the intake line may be blocked.
NOTE
Dirt particles and contamination in the sample line can block the valves of the
measuring unit.
During the cleaning activities, make sure that no dirt particles get into the open
tube ends or the connector of the filter module.
Protect the open tubes and connectors during the cleaning activities, e.g. with
blind plugs.
Maintenance
interval
2 to 4 months, depending on the application
Preparations
NOTE
The filter plate is easily damaged. Never touch the filter plate with sharp-edged
objects or place any objects on it.
Pressure on the filter plate may only be applied from the outside. No counter-
pressure may build up through the intake line.
Do not press the special brush onto the surface of the filter plate too firmly and
do not change the moving direction of the brush (do not scrub!).
1 Stop the Alyza IQ and activate the maintenance condition at the
IQ S
ENSOR
N
ET
.
2 Switch off the filtration pump with the Stop key.
3 Pull the filtration unit out of the basin or channel.
 The filter module does not have to be separated from the guide slide.
 Do not unplug the sample line.
 Do not dismount the filter plate from the frame.
4 Rinse off of the filtration unit any gross 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 a soft spe-
cial brush. Normally the brownish coating can well be seen coming off
while the lighter surface of the filter plate is appearing.