45
ELECT
rODE
C
ONDITIONING
&
mAINTENANCE
18. ELECTRODE CONDITIONING & MAINTENANCE
Potection
Sleeve
Reference Wire
Sensing Wire
Reference Junction
Platinum Ring
Glass Bulb
Glass Body
ORP Electrode
Reference fill Hole
Preparation Procedure
Remove the protective cap of the pH electrode (
HI1048B/50
). Do not be alarmed if salt deposits
are present. This is normal with electrodes. They will disappear when rinsed with distilled/deionized
water.
During transport, tiny bubbles of air may form inside the glass bulb, affecting proper functioning of
the electrode. These bubbles can be removed by “shaking down” the electrode as you would do with
a glass thermometer.
If the bulb and/or junction is dry, soak the electrode in
HI70300
Storage solution for at least one hour.
If the fill solution (electrolyte) is more than 2½ cm (1”) below the fill hole, add
HI7082
3.5M KCl
Electrolyte solution.
For faster response, unscrew the fill hole screw during measurements.
Storage Procedure
To minimize clogging and assure a quick response time, the glass bulb and the junction of the
electrode should be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few drops of
HI70300
Storage solution or, in its
absence, with
HI7082
Fill solution. Follow the preparation procedure before taking measurements.
Note:
Never store the pH electrode in distilled or deionized water.