Navigator 500
Sodium analyzer
8 Maintenance
OI/ASO550–EN Rev. G
63
8.4 Manual regeneration
Referring to Fig. 8.3:
1. Carefully unscrew plastic sleeve
A
a few turns (with
sodium electrode
B
in place).
2. Withdraw sodium electrode
B
from the sleeve and
flowcell
C
(it is not necessary to detach the electrode
lead
D
).
3. Remove O-ring
E
.
4. Prepare two plastic beakers, one containing about 50 ml
of etch solution, the other about 200 ml high purity water.
5. Dip the electrode in the etch solution for 60 (±5) seconds
then rinse in high purity water.
6. Dispose of the etch solution safely by diluting with plenty
of water (use fresh etch solution each time).
7. Refit O-ring
E
, sodium electrode
B
and screw plastic
sleeve
A
finger-tight (do not over-tighten).
8. Run the wet-section for 1 to 2 hours on sodium sample
before attempting a calibration.
8.5 Shut-down procedures
1. Close the sample valve upstream of the wet-section.
2. Remove the reagent container (see Fig. 2.1, page 6 for
bottle locations) and store or dispose of the solution safely.
If disposing, rinse the container thoroughly.
3. Fill the regeneration solution container (if fitted) with high
purity water and energize the regeneration valve via the
Man. Control Valve
menu (see Section 7.1.2, page 47) for
5 minutes.
4. Fill the calibration solution containers with high purity
water and perform a two-point calibration to flush the
wet-section.
5. Remove the electrodes and follow storage procedure in
Section 8.5.1.
6. Use a syringe to flush all tubing with high purity water. This
removes any particulate deposits.
7. Switch off the mains supply to the transmitter.
Caution.
Do not to exceed the etch time or the
electrode’s performance may be permanently
degraded.
Fig. 8.3 Manual regeneration of sodium electrode
Warning.
Observe relevant safety procedures when
handling reagent solutions.
Note.
For multiple wet-section installations, do not
switch off the mains supply to the transmitter if
operation of the remaining wet-sections needs to be
continued.
