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6.0 MAINTENANCE
The WCT controller itself requires very little maintenance. Wipe with a damp cloth. Do not spray down
the controller unless the enclosure door is closed and latched.
6.1 Electrode
Cleaning
NOTE: The controller must be recalibrated after cleaning the electrode.
Frequency
The electrode should be cleaned periodically. The frequency required will vary by installation. In a new
installation, it is recommended that the electrode be cleaned after two weeks of service. To determine
how often the electrode must be cleaned, follow the procedure below.
1. Read and record the conductivity.
2. Remove, clean and replace the conductivity electrode.
3. Read conductivity and compare with the reading in step 1 above.
If the variance in readings is greater than 5%, increase the frequency of electrode cleaning. If there is
less than 5% change in the reading, the electrode was not dirty and can be cleaned less often.
Cleaning Procedure
The electrode can normally be cleaned using a cloth or paper towel and a mild detergent. If coated with
scale, clean with a dilute (5%) hydrochloric acid solution. Occasionally a electrode may become coated
with various substances that require a more vigorous cleaning procedure. Usually the coating will be
visible, but not always. To clean a coated electrode, use fine grit abrasive, such as emery paper. Lay the
paper on a flat surface and move the electrode in a back and forth motion. The electrode should be
cleaned parallel to the carbon electrodes, not perpendicular.
Figure 22 Cleaning the Electrode
CLEAN IN
THIS DIRECTION
