Page 26
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Operation and Maintenance Manual
Rev: L13
D – 3: Total Chlorine Sensor
Check the sensor measurement at regular intervals (at
least once a month), and perform a recalibration if
necessary.
As a rule of thumb, refill the measuring cell with
electrolyte every 3 to 6 months. The membrane
should be replaced once a year.
D – 3.1: Long Term Storage
After removing the sensor from the flow cell,
empty the measuring cell of electrolyte (particularly
if dehydration of the membrane is possible). Rinse
the measuring chamber and electrode shaft with
cold water and let them dry. Then loosely screw
the measuring cell down. The membrane must not
rest against the measuring electrode.
When the sensor is put back into service, the
electrode tip must be cleaned with the special
abrasive paper and a new membrane cap must be
used.
D – 3.2: Cleaning The Electrode Tip
To clean the electrode tip, first remove the
membrane cap. Be sure to expose the vent when
removing the membrane cap to prevent damage to
the membrane. Clean the electrode finger using a
clean, dry paper towel. The special abrasive paper
is used on just the electrode tip. Place the special
abrasive paper on a paper towel and hold it at one
corner. Hold the probe perpendicular to the paper
towel and abrasive paper and rub the electrode tip
two or three times across the abrasive paper.
Once the tip has been cleaned, replace the
electrolyte.
D – 3.3: Filling Electrolyte
The lower portion (below
the upper band) unscrews.
Be sure to lift the hose
ring that covers the vent
while removing the
membrane cap.
Fill the membrane cap to the edge with the
electrolyte. Make sure there are no bubbles.
Insert the sensor into the
membrane cap. Slowly
screw the membrane cap
onto the sensor. Excess
electrolyte will escape
through a valve in the
membrane cap – do not
block this valve. Rinse
excess electrolyte off with
water.
To re-install the sensor in the flow cell:
The Probe Ring is installed first.
Slide the smaller diameter O-Ring up
the sensor body until it rests against
the Probe Ring.
Insert the larger diameter O-Ring
into the O-Ring retainer.
Warning: The membrane may be damaged
if the vent is not opened while removing the
membrane cap.
Warning: Never touch the electrode finger.