YSI Pro20 - Manual (Page 30)

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C A R E , M A I N T E N A N C E , A N D
S T O R A G E
This section describes the proper procedures for care, maintenance and storage of
the sensors. The goal is to maximize their lifetime and minimize down-time
associated with improper sensor usage.
GENERAL MAINTENANCE
GENERAL MAINTENANCE - O-RINGS
The instrument utilizes o-rings as seals to prevent water from entering the battery
compartment and the sensor ports. Following the recommended procedures will
help keep your instrument functioning properly.
If the o-rings and sealing surfaces are not maintained properly, it is possible that
water can enter the battery compartment and/or sensor ports of the instrument. If
water enters these areas, it can severely damage the battery terminals or sensor
ports causing loss of battery power, false readings and corrosion to the sensors or
battery terminals. Therefore, when the battery compartment lid is removed, the o-
ring that provides the seal should be carefully inspected for contamination (e.g.
debris, grit, etc.) and cleaned if necessary.
The same inspection should be made of the o-rings associated with the dissolved
oxygen sensor connector when it is removed. If no dirt or damage to the o-rings is
evident, then they should be lightly greased without removal from their groove.
However, if there is any indication of damage, the o-ring should be replaced with
an identical o-ring. At the time of o-ring replacement, the entire o-ring assembly
should be cleaned.
To remove the o-rings:
Use a small, flat-bladed screwdriver or similar blunt-tipped tool to remove the o-
ring from its groove. Check the o-ring and the groove for any excess grease or
contamination. If contamination is evident, clean the o-ring and nearby plastic
parts with lens cleaning tissue or equivalent lint-free cloth. Alcohol can be used to
clean the plastic parts, but use only water and mild detergent on the o-ring itself.
Also, inspect the o-rings for nicks and imperfections.