104
105
TROUBLESHOOTING GUIDE
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mV / pH / ISE CHANNEL
MEASURE
Rinse the pH electrode tip with distilled water. Immerse the sensor tip bottom 4 cm (1
1
/
2
”) 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 the pH electrode
should be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few drops of
HI 70300
or
HI 80300
Storage Solution or, in its
absence, Filling Solution (
HI 7071
or
HI 8071
for single junction and
HI 7082
or
HI 8082
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 (
HI 7071
or
HI 8071
for single junction or
HI 7082
or
HI 8082
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
HI 7061
or
HI 8061
General Cleaning Solution for approximately one hour.
•
Protein
Soak in Hanna
HI 7073
or
HI 8073
Protein Cleaning Solution for 15 minutes.
•
Inorganic
Soak in Hanna
HI 7074
Inorganic Cleaning Solution for 15 minutes. this solution is good
at cleaning a black ceramic junction.
•
Oil/grease
Rinse with Hanna
HI 7077
or
HI 8077
Oil and Fat Cleaning Solution.
IMPORTANT:
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
HI 70300
or
HI 80300
Storage Solution for at least 1 hour before taking measurements.
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