Grundfos AQC-D4 Installation And Operating Instructions Manual page 17

13.4.2 Cleaning of flow fitting
Warning
When cleaning with hydrochloric acid, it is absolutely
necessary to wear safety goggles.
Be careful not to put any cleaning solution in the
Caution
drilled hole of the contact bushing.
Before using other detergents, check the chemical
Caution
resistance of the materials, as they might be
damaged.
• The electrode block (counter-electrode M) can be cleaned with
conventional soap suds.
• If high contamination or furring is evident, clean the
dismantled flow fitting (pos. F) briefly with diluted hydrochloric
acid (maximum 5-10 %).
• After cleaning, flush all parts in contact with the acid with
running water.
13.4.3 Replacing the wear parts
See section 14.2 Spare parts.
The spare parts set 91835822 (553-1010) consists of 15 balls,
magnetic stirring stone, slide disk and gasket.
1
2
3
4
5
6
Fig. 20 Wear parts
Pos. Description
1 Electrode head
2 Balls
3 magnetic stirring stone
4 Slide disk
5 Screw part
6 Gasket (conical nipple)
13.4.4 Cleaning of the measuring electrode
• Rub the noble metal surface of the potentiostatic
electrode (pos. E), if necessary, (soiling by fat, deposits, etc.)
with scouring powder or a clean cloth.
• After cleaning, flush with running water.
13.4.5 Assembly of measuring cell
Fig. 21 Exploded view of measuring cell
Mounting instructions for the measuring cell
1. Put the floater of the sample water adjusting device (pos. L)
with its point below into the sight glass, and screw on the
floater stopper.
2. Screw in the adjusting spindle of the sample water adjusting
device (pos. L).
3. Plug the cover on the sample water limitation (pos. G).
4. Screw in the contact (pos. N) of the counter-electrode
(pos. M) manually.
5. Screw the flow fitting (pos. F) onto the mounting plate.
6. Place the slide disk (pos. 4) into the screw part.
7. Place the flat bottom of the magnetic stirring stone (pos. 3)
into the drilled hole of the screw part.
Before installing the screw part (pos. 5), check if the
counter-electrode (pos. M) is soiled with fat,
Caution
deposits, etc. If necessary, clean as described in
section 13.4.4 Cleaning of the measuring
8. Install the screw part (pos. 5) from below in the body of the
measuring cell. Keep it in a vertical position, and tighten it with
the face spanner.
9. Fill 15 balls (pos. 2) from above into the location (pos. C) of
the potentiostatic electrode (pos. E).
Look into the location for electrode installation (pos.
C):
Caution
All balls (pos. 2) must be placed below the electrode
centering (black ring with centered toothing).
electrode.
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