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4 Check and service o-rings.
Before replacing the battery cover, inspect and service the
four o-rings.
Ensure that the o-rings are not nicked or torn and that they
have no contaminants or particles on them or the sealing
surfaces inside the battery cover. en apply a thin coat of
Krytox® lubricant to each o-ring and sealing surface.
5 Replace battery cap.
Aer servicing the cap’s o-rings, insert the cap in its recess.
en, using your thumb, press down on the pressure relief
valve while turning the cap clockwise. Once the cap threads
are engaged, use the tool to tighten until snug. When
completed, the top o-ring of the cap must be below the
battery compartment opening.
Pressure in Battery Compartment
e EXO2 sonde is equipped with a pressure relief valve
to protect against catastrophic battery failure. Signicant
water leakage into battery compartment requires that
your instrument be inspected by the manufacturer or
Authorized Service Center before the next deployment.
*Battery Life Specification
When using alkaline batteries: Approximately 90 days at
20˚C at a 15-minute logging interval, and temperature/
conductivity, pH/ORP, Optical DO, turbidity, and Total
Algae-PC installed along with a central wiper which
rotates once every logging interval. Battery life is heavily
dependent on sensor conguration and is given for a
typical sensor ensemble.
When using rechargeable nickel metal hydride (NiMH)
batteries: Estimated battery life is not available because
NiMH batteries vary greatly in manufacturer capacity and
discharge curves. We recommend a NiMH D-cell battery
with a minimum rating of 10,000 milliamp hours that are
fully charged each time they are used.
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