3600 Analyzer for O
2
Measurement—Operator’s Manual 31
3600O2.OM.E9903
circular motion, polish the sensor face for at least 30 seconds, until the gold
cathode is clean and shiny. (You may need to repeat this step several times.) Make
sure to avoid skin contact with the polishing cloth; keep it free of dust and grease.
Remove the membrane support with its tool, as shown above in section 1.5.3
(taking care not to mix the membrane support with others in case you are
servicing several sensors at once).
Thoroughly rinse the membrane
support and the sensor to remove all
traces of polishing powder.
Inspect the groove between the gold
cathode and the guard ring electrode
for polishing powder deposits. You
may want to rinse away these deposits
with a strong jet of distilled water.
1.5.7 Replace Membrane
Replace the membrane support with its tool—remember, only “finger tight”—and
make sure that the side with a groove faces out when installed.
Fill the sensor head with model 2959 electrolyte
through the membrane support, using the syringe from
your recharge kit. It helps to tilt the sensor slightly,
filling the head from the lowest of the four holes facing
you. Do this slowly, forcing the air out through the top
hole.
Continue filling, returning the sensor to vertical, until
an overflow of electrolyte adheres to the surface of the
sensor face.
Take out the black plastic membrane mounting tool included with your recharge
kit. You will note that the tool is in two parts, a plunger and a hollow, cylindrical
guide.
Place the cylindrical guide of the
mounting tool over the sensor head,
around the sensing face so that it
rests on the sensor shoulder.
Place a membrane on the sensor
face and check that it lies flat and is
centered. To avoid air bubbles,
introduce the membrane at an angle
into the guide.
If you are using a sensor mask,
place it directly on top of the membrane, in the guide.
Now, pick up the
mounting tool’s plunger.
Slide your membrane
holding ring onto the
beveled edge of the
plunger.
Insert the plunger, with
holding ring, into the
open hole of the guide,
and push down to a stop.
Using a jet of distilled water to clean groove
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