30
PROBE MODE
Storage Procedure
To minimize clogging and ensure a quick response time, the glass bulb and the junction 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 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.
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.
Cleaning Procedure
Use diagnostic messages to aid pH electrode troubleshooting. Several cleaning solutions are
available:
• 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.
Note: After performing any of the cleaning procedures, rinse the electrode thoroughly with
distilled water, refill the reference chamber with fresh electrolyte (not necessary for gel- filled
electrodes) 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 electrodes cap. The pH electrode’s life also
depends on the temperature that is used. If constantly cycled between two temperatures, the life of
the electrode is drastically reduced.