Gently remove the wetting cap from the electrode by unscrewing the bottle form the cap and then sliding the cap
and o-ring off of the electrode body. Save the cap for future long-term storage. Some electrodes are shipped with
slide-on caps sealed with teflon tape, these caps are simply pulled off.
During shipping, the air space inside the pH glass internal may have moved into the bulb. Grasp the electrode near
the cable end and gently swing it through an arc to force the internal electrolyte into the pH bulb.
ELECTRODE CLEANING
Slow response and large offsets may indicate the electrode has become coated. The nature of the coating will
dictate the type of cleaning technique that should be used.
Soft coatings, like foodstuffs or bacterial films are best removed using a squirt bottle or the water jet from a faucet. If
this is not successful, then wiping with a soft, wet cloth is the best choice.
Hard coatings, like calcium or lime scale are best removed with a solvent appropriate for the particular coating. A
5% solution of HCI would be a good choice for the calcium scale. If unsure of the proper solvent to remove a hard
mineral coating, alternate between a 5% HCI and a 4% NaOH for 10 minutes each. After treating the electrode with
these strong acids or bases, rinse the electrode with water and soak it in pH 4 buffer for at least 1/2 hour.
Greasy and oil coatings are best removed with a detergent solution or a solvent that will not attack the electrodes
body. Methanol and isopropyl alcohol are good choices for solvents. Acetone, MEK, THF, or trichloroethane will
irreparably harm the electrode. A soft toothbrush can be used with the detergent in removing stubborn coatings.
The platinum or gold sensing tip of an ORP electrode should be cleaned just like a pH electrode. The surface can
also be cleaned with an abrasive as a last resort. Gently scour the platinum with a 600 grit wet emery cloth or
preferably a 1-3 micron alumina polishing powder.
Important: Good laboratory practices should be used and protective gloves and safety glasses should be worn while
handling any solvents or chemicals. If you are unsure of the proper technique for handling a chemical or of its
hazardous properties, it is best to discard the electrode, eliminating the risk of danger.
INTERPRETING PH/ORP READINGS
1. To check the measured pH and/or ORP readings, run the filter pump for at least 5 minutes. Press the DOWN
arrow button on the master panel until the desired reading is displayed. The DOWN button will toggle the display
through the available chemical sensor readings.
2. Adjust water chemistry as close to these suggested readings as possible:
Alkalinity: 100 ppm
Total Dissolved Solids (TDS): 500 ppm
PH: 7.2 - 7.8
3. Once water chemistry has been adjusted as per #1, note ORP reading (mV). This reading can be used to
indicate proper water chemistry in your installation. If the ORP reading changes dramatically, adjust the water
chemistry accordingly.
4. Millivolt reading should fall between 500-750 mV.
5. If ORP reading falls outside of suggested range, adjust water chemistry accordingly.
Note: ORP readings are affected by the following factors: water temperature, total dissolved solids,
cyanuric acid, and alkalinity.
WINTERIZATION
1. Disconnect the sensor connector from the PCB board located in the power center.
2. Carefully remove the sensors from the plumbing.
3. Reinsert the electrode into the wetting cap and fill cap with pool water.
4. Store at room temperature.
5. When reinstalling the probe, refer back to the Preparation for Use section of the Care and Maintenance
instructions.
10
PH/ORP OPTION (continued)
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