YSI ProDSS - Manual (Page 64)

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Maintenance and storage
pH - pH/ORP sensor storage
The pH - pH/ORP sensors are shipped with their tips in a storage bottle containing KCl. Store the pH - pH/ORP sensors
in the shipping container when not in use.
Figure 71 pH - pH/ORP short-term
storage
pH - pH/ORP sensor short-term
storage (less than 4 weeks)
When in regular field use, the pH-pH/ORP sensors should remain
installed on the bulkhead. Place approximately 0.5 in (1 cm) of any water
(tap or environmental) in the calibration cup (
Figure 71 ).
Install the calibration cup onto the bulkhead and firmly tighten to prevent
evaporation.
Figure 72 pH - pH/ORP long-term
storage
pH - pH/ORP sensor long-term storage
Remove the sensor from the bulkhead and insert the sensing end into
the shipping bottle. Install the bottle o-ring and tighten (
Figure 72 ).
The shipping bottle contains a 2 molar solution of pH 4 buffer. If this
solution is not available, store the sensor in tap water.
NOTICE: To prevent damage, do not store the pH - pH/ORP
sensors in Zobell solution or DI water.