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Maintenance and Storage
Figure 76 pH and pH/ORP
long-term storage
Long-term Storage:
Remove the sensor from the bulkhead and plug the bulkhead port. Insert
the sensor tip into the storage bottle and solution that were originally
supplied with the sensor (Figure 76). The storage bottle features an open
cap and o-ring to form a tight seal around the sensor tip; the solution
contains KCl with potassium phthalate and a preservative. If this original
solution is not available, one can prepare a 2 M KCl solution or use pH
4 buffer as an alternative, though these solutions should be monitored
for microbial growth and replaced if growth is apparent. Other sensors
and system components should not be stored in or exposed to these pH
buffers for long periods of time.
NOTICE: Do NOT let the sensor dry out. Do NOT store the sensor
in distilled or deionized water. Either of these will
radically shorten the lifespan of the sensor module and
void its warranty.
Sensor Module
The pH and pH/ORP sensors feature user-replaceable sensor modules. These modules contain a reference solution
that depletes over time. The warranty period for both of these modules is 12 months:
• Replacement pH Module [SKU: 626963] = 12 months
• Replacement pH/ORP Module [SKU: 626964] = 12 months
Depending on usage and storage practices, the module may last longer than its warranty period. Replace the module
if the sensor exhibits a slow response time after trying all the cleaning methods listed above.
pH/ORP Sensor Maintenance and Storage (continued)
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