23Instruction Manual
SECTION 5 - MAINTENANCE
5.1 pH ELECTRODE AND CABLE
The most frequently replaced part is the pH
electrode, which will deteriorate with age. Rellable
electrodes should be checked for level frequently,
and replenished with lling solution as necessary.
An electrode may also fail because of:
1. Aging. (slow response to changing pH)
2. Coatings over the glass bulb. (slow response
to changing pH)
3. Abrasion of the glass bulb. (shift in calibration)
4. Chemical attack.
5. Breakage.
If you experience instability or lack of response,
check the electrode, replace if necessary and
recalibrate. Follow manufacturer’s recommendation
for cleaning the electrode. Take care not to damage
input cables, or allow the connections to get wet.
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