125 Measuring with pH & ORP Probes
21.5. CONDITIONING & MAINTENANCE
General Maintenance
• After prolonged storage or cleaning, calibration of the probe is required.
• After use, rinse the probe with tap water and dry it.
• Inspect all sensor connectors for corrosion, replace if necessary.
Periodic Maintenance
• Inspect the electrode for any scratches or cracks. If any are present, replace the electrode.
• Inspect the cable. The connection cable must be intact.
• Rinse off any salt deposits with water.
pH & ORP Sensor Maintenance
• Remove the sensor protective cap. Do not be alarmed if any salt deposits are present. This is normal with
pH / ORP probes and they will disappear when rinsed with water.
• Shake down the probe to eliminate any air bubbles inside glass bulb.
•
If the bulb and / or junction are dry, soak the electrode in HI70300 Storage solution for at least 30 minutes
• To ensure a quick response, the glass bulb and the junction should be kept moist and not allowed to dry.
This can be achieved by installing the electrode in such a way that it is constantly in the flow‑cell or the
pipe filled with the sample.
• Store the sensor with a few drops of HI70300 Storage solution or pH 4.01 in the protective cap.
• ORP electrodes
` In case of errors or faulty/fluctuating readings, gently polish the metal tip with a lightly abrasive
paper, paying attention not to scratch the surface. Follow with a thorough wash.
Note: Never use distilled or deionized water when stored.
pH Cleaning Procedure
1.
Soak the sensor in HI7061 Electrode cleaning solution for general use or application‑specific cleaning
solution for 15 minutes (i.e. HI7073 Protein cleaning, HI7074 Inorganic cleaning, HI7077 Oil and Fat
cleaning solution).
2. Rinse the sensor with water.
3. Soak the electrode in HI70300 Storage solution for at least 30 minutes, rinse with water and calibrate
before using.
Protein, Inorganic, Oil, or Grease Cleaning Procedure
1.
Soak the sensor in application specific electrode cleaning solution for 15 minutes (i.e. HI7073 Protein
cleaning, HI7074 Inorganic cleaning or HI7077 Oil & Fat cleaning solution).
2. Rinse the sensor with water.
IMPORTANT: After performing any of the cleaning procedures, rinse the electrode thoroughly with water and
soak in HI70300 Storage solution for at least 30 minutes before calibrating it.
Storage
•
When the pH probe is removed from the process for more than 1 hour, fill the protective cap with HI70300
Storage solution and tighten the cap on the sensor. Never store the probe in distilled or deionized water.
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