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PROBE MODE
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pH ELECTRODE CONDITIONING & MAINTENANCE
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, connectors must be perfectly clean and dry.
If there are any scratches or cracks on the electrode stem or bulb, replace the electrode.
For refillable electrodes, refill the reference chamber with fresh electrolyte (HI7082 or HI8082 3.5M
KCl Electrolyte solution). Allow the electrode to stand upright for 1 hour.
Cleaning Procedure
Several cleaning solutions are available:
• General – Soak in Hanna HI7061 or HI8061 General cleaning solution for approximately
30 minutes.
• 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 and grease – Rinse with Hanna HI7077 or HI8077 Oil and Fat cleaning solution.
After performing any of the cleaning procedures, rinse the electrode thoroughly with distilled water,
refill the reference chamber with fresh electrolyte (refillable electrodes only) and soak the electrode in
HI70300 or HI80300 Storage solution for at least 1 hour before taking measurements.
Temperature Correlation for pH Sensitive Glass
Verify the temperature range by reading the limits on electrode’s cap. The pH electrode’s life is
temperature dependent. If constantly cycled between two temperatures, the life of the electrode is
drastically reduced.
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