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mAiNTENANCE & CONDiTiONiNG
15. MAINTENANCE & CONDITIONING
Electrode Maintenance
• Soak the pH bulb and reference junction in HI70300 Storage Solution for a minimum of 1 hour
before attempting.
• After prolonged storage or cleaning, calibration of the electrode.
• After use, rinse the electrode with purified water and blot excess moisture with a lint free tissue.
• Inspect all sensor connectors for corrosion and replace if necessary.
pH 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 as you would do with a clinical thermometer to eliminate any air bubbles
inside the glass bulb.
• If the bulb and / or junction are dry, soak the electrode in HI70300 Storage solution for at least 1 hour.
• 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 storing the sensor with a few drops of HI70300 Storage solution or
pH 4.01 in the protective cap.
Note: Never use distilled or deionized water to store electrode.
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 Cleaning Procedure
1. Soak the sensor in HI7061 Electrode cleaning solution for general use or application specific
cleaning solution for 15 minutes.
2. Rinse 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 (i.e. HI7073 Protein cleaning,
HI7074 Inorganic cleaning for 15 minutes or HI7077 Oil and Fat cleaning solution).
2. Rinse the sensor with water.
Note: 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.
3. Soak the electrode in HI70300 Storage solution for at least 1 hour, rinse with water, and
calibrate before using.
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