Rev. 0-401
7
Model GLI-9143 Portable D.O. Meter
2.
Unscrew the membrane cap by turning it
counterclockwise (see Figure 2).
3.
Wet the sensor by
soaking the bottom 2½
cm (1 inch) of the
probe in electrolyte
(GLI-7041S) for 5 min-
utes.
4.
Rinse a new mem-
brane cap (GLI-76407
A/P) with electrolyte
while shaking it gently.
Refill with clean elec-
trolyte.
5.
Gently tap the sides of
the membrane with
your finger tip to en-
sure that no air
bubbles remain trap-
ped. Do not directly
tap the bottom as this may cause irrepa-
rable damage to the membrane.
6.
Make sure that the rubber O-ring is
seated properly inside the membrane
cap.
7.
With the sensor facing down, screw the
membrane cap clockwise. Some elec-
trolyte will overflow.
CLEANING PLATINUM CATHODE
The platinum cathode (item # 8 in the
FUNCTIONAL DESCRIPTION - PROBE on
page 3) should always be bright and untar-
nished. If it is tarnished or stained, which
could be due to contact with certain gases or
extended use with a loose or damaged mem-
brane, the cathode should be cleaned:
1.
Use a clean, 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 platinum tip.
2.
Rinse the probe with deionized or dis-
tilled water.
3.
Install a new membrane cap and fill it
with fresh electrolyte following the previ-
ous instructions.
4.
Recalibrate the instrument.
CLEANING MEMBRANE
In order to have accurate and stable meas-
urements, it is important that the surface of
the membrane is in perfect condition. This
permeable membrane isolates the sensor
elements from the environment but allows
oxygen to enter. If any dirt is deposited on the
membrane:
1.
Rinse it carefully with distilled or deion-
ized water.
2.
If any imperfections are observed, or any
damage is evident (such as wrinkles,
tears or holes), the membrane cap
should be replaced.
3.
Make sure that the O-ring is properly
seated in the membrane cap.
FIGURE 2
