45
ELECTRODE CONDITIONING AND MAINTENANCE
For faster response, unscrew the fill hole screw during measurements.
MEASUREMENT
Rinse the pH electrode tip with distilled water. Immerse the tip (bottom 4 cm /1½” ensuring the
reference junction is submerged) in the sample and stir gently for a few seconds.
For a faster response and to avoid cross‑contamination of the samples, rinse the electrode tip with a
few drops of the solution to be tested, before taking measurements.
STORAGE PROCEDURE
To minimize clogging and assure a quick response time, the glass bulb and the junction of pH
electrode should be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few drops of HI70300 or HI80300 Storage Solution
or, in its absence, Filling Solution (HI7082 or HI8082 for double junction electrodes). Follow the
Preparation Procedure on page 44 before taking measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for connection to the instrument must be intact
and there must be no points of broken insulation on the cable or cracks on the electrode stem or bulb.
Connectors must be perfectly clean and dry. If any scratches or cracks are present, replace the elec‑
trode.
Rinse off any salt deposits with water.
pH Probe Maintenance
For refillable electrodes:
Refill the reference chamber with fresh electrolyte HI7082 or HI8082 for double junction electrodes.
Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.
pH CLEANING PROCEDURE
• General Soak in Hanna Instruments HI7061 or HI8061 General Cleaning Solution for approxi‑
mately ½ hour.
• Protein Soak in Hanna Instruments HI7073 or HI8073 Protein Cleaning Solution for 15 minutes.
• Inorganic Soak in Hanna Instruments HI7074 Inorganic Cleaning Solution for 15 minutes.
• Oil/grease Rinse with Hanna Instruments HI7077 or HI8077 Oil and Fat Cleaning Solution.
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