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ELECTRODE CONDITIONING AND MAINTENANCE
For faster response, unscrew the fill hole screw during measurements.
For AmpHel® electrodes:
If the electrode does not respond to pH changes, the battery run down and the electrode should be
replaced.
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.
See that the sleeve holes of the ORP probe are completely submerged.
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 (HI7071 or HI8071 for single junction and HI7082 or HI8082
for double junction electrodes). Follow the Preparation Procedure on page 56 before taking mea‑
surements.
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 (HI7071 or HI8071 for single junction or 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 HI7061 or HI8061 General Cleaning Solution for approximately
½ hour.
• Protein Soak in Hanna HI7073 or HI8073 Protein Cleaning Solution for 15 minutes.
• Inorganic Soak in Hanna HI7074 Inorganic Cleaning Solution for 15 minutes.
• Oil/grease Rinse with Hanna HI7077 or HI8077 Oil and Fat Cleaning Solution.
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