Maintenance; Electrode Cleaning Procedures - Advantage Controls MegaTronMT Manual

VI. Maintenance
The only required maintenance for normal uninterrupted operation of your MegaTronMT controller is cleaning
of the electrode(s). After initial start up, it is a good idea to clean the electrode frequently until a schedule
To determine the required cleaning frequency, record the reading on the controller before the electrode is
removed for cleaning. After cleaning, record the new reading. If a change is observed in the two readings,
cleaning needs to be done less often.
Conductivity Electrode Cleaning Procedure
1. Record the current conductivity reading.
electrode.
surface of the electrode.
4. If the electrode has deposits such as scale attached to the electrode surface a more
aggressive cleaning approach will be needed. There are several ways to do this, the
preferred method being the one that is easiest for the user.
a.
5. Reinstall the electrode in the system. After the reading stabilizes, calibrate the unit to a
reliable test reading.
Many times an electrode can appear to be clean, but the unit still cannot be calibrated. If this is the case, use
one of the more aggressive electrode cleaning procedures listed in step 4 above. Recheck the calibration
after completion of this procedure. If no change was observed in the reading, replace the electrode. If a
change occurred but the unit still will not calibrate, repeat procedure as many times as necessary.
pH and ORP Electrode Cleaning Procedure
1. Remove the pH electrode from the system.
2. Spray with water and/or detergent, using a soft brush to dislodge any fouling.
3. Visually inspect the electrode for signs of damage.
4. Calibrate the electrode while it is in a known solution.
Slow response or non-reproducible measurements are signs that the electrode has become coated or
clogged. The pH glass is susceptible to mounting by many substances. The speed of response, normally
95% of the reading in less than 10 seconds, is dramatically degraded when the pH glass is coated.
To restore the speed of response for a pH electrode, clean the bulb with a high quality detergent, methyl
now responds, but erratically, soak the sensor in 0.1 Molar HCl for 5 minutes. Remove and rinse with water
for 10 minutes before use.
Use a mild acid solution to dissolve deposits.
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