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74
For AmpHel
®
electrodes:
If the electrode does not respond to pH changes, the battery may have run down and the electrode
or battery (if replaceable) should be replaced.
MEASURE
Rinse the pH electrode tip with distilled water. Immerse the tip bottom 4 cm (1.5”) 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 ensure 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 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 electrode. 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 Instruments HI7061 or HI8061 General Cleaning Solution for
approximately 30 minutes.
• Protein Soak in Hanna
Instruments HI7073 Protein Cleaning Solution for 15 minutes.
• Inorganic Soak in Hanna Instruments HI7074 Inorganic Cleaning Solution for 15 minutes.
This is good at cleaning a black ceramic junction.
• Oil/grease Rinse with Hanna Instruments HI7077 or HI8077 Oil and Fat Cleaning Solution.
ELECTRODE CONDITIONING AND MAINTENANCE
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