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The Platinum cathode
should always be bright
and untarnished. If it is
tarnished or stained, due
to contact with certain
gases or a damaged
membrane cap, the cathode
should be cleaned. You
can use a clean lint-free
cardboard or cloth. Rub
the cathode very gently
side to side 4-5 times. This
will be enough to polish
and remove any stains
without damaging the
platinum tip.
Rinse the probe with deionized or distilled water and install
a new membrane cap using fresh electrolyte (see page 1).
Recalibrate the instrument/probe.
Note: In order to obtain accurate and stable measurements, it
is important that the surface of the membrane be in
perfect condition. This gas-permeable membrane isolates
the sensor elements from the environment, but allows
oxygen to enter. If any dirt is observed on the membrane,
rinse it carefully with distilled or deionized water. If any
imperfections still exist, or any damage is evident (such
as wrinkles or tears-holes), the membrane cap should
be replaced. Make sure that the O-Ring is properly seated
in the membrane cap.
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