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With the sensor facing down, screw the
membrane cap clockwise. Some electro-
lyte will overflow.
The Platinum cathode (#8 in the Functional
Description at page 4) should always be bright
and untarnished. If it is tarnished or stained,
which could be due to contact with certain
gases or extended use with a loose or dam-
aged membrane, the cathode should be
cleaned. Use a lint-free cardboard or cloth
and rub the cathode very gently side to side
4-5 times. This will be enough to polish and
remove any stains without damaging the plati-
num tip. Afterwards, rinse the probe with
deionized or distilled water and install a new
membrane cap using fresh electrolyte.
Recalibrate the instrument.
Important: In order to have accurate and
stable measurements, it is important that the
surface of the membrane is in perfect condi-
tion. This semi-permeable membrane isolates
the sensor elements from the environment
but allows oxygen to enter. If any dirt is
observed on the membrane, rinse carefully
with distilled or deionized water. If any imper-
fection still exists, or any damage is evident
(such as wrinkles or tears), the membrane
should be replaced. Make sure that the O-
Ring is properly seated in the membrane
cap.
18
BATTERY REPLACEMENT
When the battery level is
low, a "V" will be displayed
to warn the user that the
battery should be replaced.
The meter will still work for approximately 4
hours, then the display will be shut-off to
avoid erroneous readings.
Battery replacement must only take place in
a safe area and using the battery type speci-
fied in this instruction manual.
Slide off the battery cover on the rear of the
meter and replace the 9V battery with a new
one.
BATTERY
19
V
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