month and replace the membrane and electrolyte solution every three months. Sensors
used in dirty water require more frequent maintenance and calibration. However, if
experience shows the sensor is holding calibration and not drifting appreciably between
calibration intervals, the maintenance interval can be extended.
12.2.2 Cleaning the membrane
Keep the membrane clean.
Clean the membrane with water sprayed from a wash bottle. Use a soft tissue to gently
wipe the membrane.
12.2.3 Replacing the membrane
Complete the following steps to replace the membrane on the total chlorine sensor.
1. Hold the sensor with the membrane facing up.
2. Unscrew the membrane retainer. Remove the membrane assembly and O-ring.
See Figure 12-2.
3. Inspect the cathode. If it is tarnished, clean it by gently rubbing in the direction of
the existing scratches (do not use a circular motion) with 400-600 grit silicon carbon
finishing paper. Rinse the cathode thoroughly with water.
4. Prepare a new membrane. Hold the membrane assembly with the cup formed by
the membrane and membrane holder pointing up. Fill the cup with electrolyte
solution. Set aside.
5. Put a new O-ring in the groove.
6. Place a drop of electolyte solution on the cathode. Invert the membrane assembly
and place it over the cathode stem.
7. Screw the membrane retainer back in place.
8. Hold the sensor with the membrane pointing down. Shake the sensor a few times,
as though shaking down a clinical thermometer.
12.2.4 Replacing the electrolyte solution and membrane
WARNING!
HARMFUL SUBSTANCE
Fill solution may cause irritation. Avoid contact with skin and eyes. May be harmful if
swallowed..
Procedure
1. Unscrew the membrane retainer.
2. Remove the membrane assembly and O-ring.
See Figure 12-2.
Maintenance
Manual 55
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