9032X
46
o
Switch off the main power supply to the Transmitter Unit.
5.6.1
STORAGE OF ELECTRODES
Fill the storage bottle, supplied with the
sodium electrode
, with 5M sodium solution.
Push the bottle over the end of the electrode and tighten the cap. For the refillable
reference electrodes, fill the storage bottle with the refillable solution and push the
bottle over the end of the electrode and tighten. Refit the filling hole cap to seal the
refill aperture. For storing the Gel-filled electrode, fill the rubber teat with a dilute KCl
solution and push teat over the end of the electrode.
Note
. Do not let either electrode dry out!!!
5.7
pH EFFECTS
Measuring the pH of the effluent from the flowcell indicates adequate buffering. The
minimum pH depends on the minimum sodium concentration, but the pH value is
calculated as:
pH must be greater than pNa + 3, so ideally at:
o
100ppb Na+, the pH must be greater than 8.4
o
10ppb Na+, the pH must be greater than 9.4
o
1ppb Na+, the pH must be greater than 10.4
o
0.5ppb Na+, the pH must be greater than 11.4
Note
. If the buffer is allowed to become completely exhausted, the reading may be
very erratic due to the lack of ionic strength adjustment of the high purity sample.
6
SPARE PARTS
Recommended Spare Parts
PART NUMBER
DESCRIPTION
N3010-177
Measuring Electrode
N3010-174
Refillable Reference Electrode
N3010-173
Gel-filled Reference Electrode
N3010-176
Detachable Lead, 9032
P2000-049
Kit, Re-tubing & O-Ring
N1234-543
Sodium Electrode Regeneration Solution (2 fl.oz.)
