Grundfos AQC-D12 Installation And Operating Instructions Manual page 20

12.3.3 Cleaning the measuring cell
• Required tools and aids:
– soap suds, diluted hydrochloric acid (5-10 %), water
– abrasive domestic cleaning agent (for instance ATA, VIM).
• The measuring cell can be cleaned with conventional soap
suds.
• If high contamination or furring is evident, clean the
dismantled measuring cell briefly with diluted hydrochloric acid
(max. 5-10 %).
Warning
Observe the safety regulations when using
hydrochloric acid!
Wear protective clothing (gloves and goggles) when
cleaning with hydrochloric acid!
Before using other detergents, check the chemical
Caution
resistance of the materials.
Do not clean electrodes, filters or other metal parts
Caution
with hydrochloric acid.
1. Clean the metal surfaces of the measuring electrode (J) with
an abrasive domestic cleaning agent, if there are deposits.
2. Carefully clean all plastic parts with soap suds.
3. Use hydrochloric acid (5-10 %) for deposits.
4. Carefully rinse all parts with clean water.
5. Replace any damaged parts.
20
12.3.4 Assembling the measuring cell
Only tighten screw parts by hand; do not use tools!
Caution
Risk of leaking! Make sure that all O-rings are fitted
correctly!
A / B
L
M
K
E
S
J
F
H1
H2
H
I
Fig. 25 Assembling the measuring cell
Pos. Description
A pH electrode
B Redox electrode
E Connection for sample water inlet
F Connection for sample water outlet
X Sample water shut-off valve
G Regulation of sample water quantity
H Sample water filter (H1, H2)
I Sampling cock
J Measuring electrode for Cl
K Reference electrode for Cl
L Cover with threaded ring
M Acrylic glass cylinder
S Cleaning wing
Re-assemble the measuring cell in reverse order.
X G
, ClO , O
2 2 3
, ClO , O
2 2 3