Azbil MIZCON Plus - Page 20

20 AB-6650
Inspection and Maintenance
Controller
MIZCON Plus controller does not require to be periodically cleaned. Remove the dust covered the top and bottom vent
holes (slits) of the controller housing if necessary.
4-electrode sensor
Scale and slime coated the electrodes may prevent the electrodes to contact water. Periodically take the 4-electrode
sensor out of the cooling water tank to inspect and cleanse.
1. Inspecting and cleansing period
• For the MIZCON Plus used for a general cooling tower, inspect and cleanse the sensor once every 2 months.
• For other than the above, inspect and cleanse the sensor 1 month after the sensor activated. Then, schedule the next
inspection based on the results of the first inspection. (Once every 2 months in general.)
2. Inspection
Check the water sampling probe. If the inside of the probe including the electrodes are coated with slim, scale, and
other substances, cleanse the probe. See Fig. 19.
Sampling probe of the 4-electrode sensor
Electrode
Substances coating the inside of sampling probe
Figure 19. Inspection of the 4-electrode sensor (sampling probe)
CAUTION
• Be sure to turn off the power switch of the controller before replacing the 4-electrode sensor.
• MIZCON Plus requires 2 hours after the power is turned on to stably operate.
3. Cleansing
• Lightly brush the inside of the sampling probe using toothbrush with alkaline cleanser to remove the substances
coating there. Then rinse well with water. Do not use metal brush.
• Brush the 4 electrodes well to remove all the substances. The substances coating the electrodes may cause
measuring error.
Figure 20. Cleansing of the electrodes
4. MIZCON Plus in long-term shutdown
To deactivate MIZCPON Plus for a long term, take the 4-electrode sensor out of the cooling water tank, cleanse, rinse,
dry, and then put it in a plastic bag for storage. Cleans and rinse the sensor beforehand when using it again.
5. Replacement
Replace the 4-electrode sensor every 3 to 5 years.
Be sure to turn off the power switch of the controller before replacing the sensor.
Electrode
Before cleansed After cleansed