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6.0 MAINTENANCE
The WBL 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 in the process.
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, toothbrush, cotton swab or paper towel and a mild
detergent. Occasionally an electrode may become coated with various substances which require a more
vigorous cleaning procedure. Usually the coating will be visible, but not always. If the electrode is
coated with scale, this can be chemically removed using a dilute acid solution.
6.2
Replacing the Fuses
CAUTION
: Disconnect power to the controller before opening front panel!
Locate the fuses on the circuit board at the back of the controller enclosure. (See figure 3) Gently remove
the old fuse from its retaining clip and discard. Press the new fuse into the clip, secure the front panel of
the controller and return power to the unit.
Warning:
Use of non-approved fuses can affect product safety approvals. Fuse ratings depend on
controller power rating. Specifications are shown below. To insure product safety certifications are
maintained, it is recommended that a Walchem fuse be used.
F1 Fuse
Walchem P/N
F2 Fuse
Walchem P/N
5 x 20 mm, 1.0A, 250V
103163
5 x 20 mm, 6A, 250V
102864
