Table of Contents
Advertisement
14. Maintenance
14.1 Intervals for cleaning and maintenance
Prior to maintenance work: Switch off the system
Caution
as described in section 13.3 Switching off!
•
Clean the filter
– if high contamination is evident, or if the pressure drops
considerably.
•
Clean the whole flow armature
– if high (visible) contamination is evident.
– if faults occur.
– before starting up again after a prolonged stoppage.
•
Replace the electrodes.
– Grundfos recommends that you replace the reference
electrode and, if necessary, the redox or pH single-rod
electrode after 12 months.
– The measuring electrode is wear-resistant and does not
have to be replaced on a regular basis.
14.2 Cleaning and replacing the filter
•
Required tools and aids:
– water
– soft brush.
1. Close the connection to the sample water inlet (U1) and
outlet (U2).
2. Unscrew the filter cartridge (P).
3. Unscrew the plastic screw thread (P1) at the upper end of the
filter cartridge (P), using a screwdriver or coin, if necessary.
4. Remove the filter strainer (P2) from the filter receptacle (P3),
and clean it under running water. Use a soft brush, if
necessary.
5. If damaged: Replace the filter strainer (P2).
6. Re-assemble the filter cartridge (P) in reverse order.
7. Check the tightness of the filter cartridge (P).
After cleaning, check the sample water flow rate,
Note
and adjust it, if necessary.
Fig. 23 Filter
22
P1
P2
P3
14.3 Cleaning the flow armature
14.3.1 Removing the measuring cell
The measuring cell must only be removed by
Caution
authorised personnel.
1. Close the water inlet, and switch off the measuring cell.
– Close the shut-off spindles of the sample water inlet (V1)
and outlet (V2).
– Close and/or switch off the device controlled (for instance a
gas dosing unit or dosing pump).
– Wait until the display of the measuring amplifier is at zero.
– Switch off the electricity supply to the measuring amplifier.
2. Empty the measuring cell.
– Open the bleeding spindle (L) and deaeration spindle (J),
and drain the water.
– Unscrew the connections to the sample water inlet (U1) and
outlet (U2).
3. Remove the electrodes and sensors.
– If a water sensor is fitted: Unscrew the screw (O1) on the
water sensor (O), and remove the sensor.
– Unscrew the plug for the measuring electrode (E), and
remove the electrode.
– Remove the reference electrode (B1). Fit thread protective
caps, and clean the electrode.
– Remove the pH (A1) and redox electrodes (A2), if
necessary. Fit thread protective caps, and clean the
electrodes.
– Fit protective caps on the electrodes. The protective caps
must be filled with 3-molar potassium chloride solution.
Observe the installation and operating
Caution
instructions of the electrodes!
– Store electrodes with protective caps in a dry place.
Carefully remove the screwed part (H)! The
cleaning wing (X) and inlet chamber (W) are loose
Note
on the measuring electrode (D) and may fall out!
Keep O-rings!
4. Unscrew the measuring electrode.
– Unscrew the screwed part (H) from the flow armature (F)
with the slide (G1), and remove them carefully.
– Keep O-rings (W1).
– Remove the cleaning wing (X) and inlet chamber (W).
5. Remove the flow armature.
– Slacken the screws of the flow armature (do not unscrew
completely), press the flow armature upwards, and remove
it from the mounting plate.
Fig. 24 Exploded view of screwed part
W1
W
W1
X
H
D
G1
Advertisement
Table of Contents
