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12. Maintenance
Warning
Prior to cleaning and maintenance: Switch off the
system as described in section
Make sure that the mains is switched off at all poles!
12.1 Intervals for cleaning and maintenance
•
Clean the filter
– if high contamination is evident, or if the pressure drops
considerably.
•
Clean the whole measuring cell
– if high contamination is evident
– if faults occur
– before start-up after long-term stop.
•
Replace the electrodes.
– Grundfos recommend to replace the reference electrode
and the redox or pH electrode after 12 months.
– The measuring electrode is wear-resistant.
12.2 Cleaning and replacing the filter
•
Required tools and aids:
– water
– soft brush.
Caution
Do not completely unscrew the sampling cock (I)!
1. Unscrew the filter holder (H).
2. Remove the filter (H1).
3. Clean the filter and filter holder with water. Use a soft brush, if
necessary.
4. Replace O-ring (H2), if damaged.
5. Insert filter into filter holder.
6. Screw back the filter with filter holder.
After cleaning, check the sample water flow rate.
Note
Adjust, if necessary.
Fig. 24 Filter
11.3 Switching off
!
H1
H2
H
I
12.3 Cleaning the measuring cell
12.3.1 Removing the measuring cell
The measuring cell must only be removed by
Caution
authorised personnel.
Caution
Do not completely unscrew the sampling cock (I)!
1. Empty the measuring cell.
– Completely empty the measuring cell through the sampling
cock (I).
– Loosen the water connections (E, F).
2. Remove the cover, remove the electrodes and sensors.
– Loosen the threaded ring and remove the cover (L).
– Leave the pH electrode (A) and redox electrode (B) in the
cover.
– Clean the pH electrode (A) and redox electrode (B). Place
the protective caps onto the electrodes.
– Carefully lay the cover (L) down to the side.
– Remove the measuring electrode (J) and the reference
electrode (K).
– Clean the reference electrode (K). Attach the protective cap
onto the electrode.
– The protective caps must be filled with 3-molar potassium
chloride solution.
Observe the installation and operating instructions of
Caution
the electrodes!
– Store electrodes with protective caps in a dry place.
3. Unscrew the measuring cell from the mounting plate.
12.3.2 Dismantling the measuring cell
1. Unscrew the filter holder (H).
2. Remove the filter (H1).
3. Unscrew the acrylic glass cylinder (M).
4. Carefully unscrew the rising pipes.
5. Remove the connection parts.
6. Completely unscrew the regulation of sample water quantity
(G).
7. Completely unscrew the sample water shut-off valve (X).
Danger of damaging the fine thread. Unscrew the
regulation of sample water quantity (G) completely,
Caution
before unscrewing the sample water shut-off valve
(X)!
8. Unscrew the water sensor (D).
9. Unscrew the temperature sensor (C), see section
10.1.3 Temperature sensor
.
19
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