Hanna Instruments HI 8510 - Manual (Page 23)

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PERIODIC MAINTENANCE
Inspect electrode and cable. The cable used
for the connection to the meter must be intact
and there must be no points of broken insula-
tion on the cable or cracks on the electrode
stem or bulb.
Connectors must be perfectly clean and dry.
If any scratches or cracks are noted, replace
the electrode.
Rinse off any salt deposits with water.
For refillable electrodes:
Refill the electrode with fresh electrolyte
solution (HI 7071 for single junction electrodes
or HI 7082 for double junction). Allow the
electrode to stand upright for 1 hour.
Follow the above "Storage Procedure".
CLEANING PROCEDURE
General Soak in HI 7061 general cleaning
solution for approximately 1 hour.
Removal of films, dirt or deposits on the mem-
brane/junction:
Protein
Soak in Hanna HI 7073 protein
cleaning solution for 15 minutes.
Inorganic Soak in Hanna HI 7074 inorganic
cleaning solution for 15 minutes.
Oil/grease Rinse with Hanna HI 7077 oil &
fat cleaning solution.
IMPORTANT: After performing any of the
cleaning procedures, rinse the electrode thor-
oughly with distilled water, drain and refill the
reference chamber with fresh electrolyte, (not
necessary for gel-filled electrodes) and soak
the electrode in HI 70300 storage solution for
at least 1 hour before taking measurements.
If the bulb and/or junction are dry, soak the
electrode in HI 70300 storage solution for at
least one hour.
For refillable electrodes:
If the internal electrolyte solution is more than
1 cm (½") below the filling hole, add HI 7082
solution (3.5M KCl) for double junction
electrodes or HI 7071 (3.5M KCl+AgCl) for
single junction electrodes.
For a faster response unscrew the filling hole
screw during measurements.
For AmpHel ® electrodes:
If the electrode does not respond to pH
changes, the battery is run down and the
electrode should be replaced.
MEASUREMENT
Rinse the electrode tip with distilled water.
Immerse the electrode tip (4 cm) in the sample
and stir gently for approximately 30 seconds.
For a faster response and to avoid cross
contaminations, before taking measurements,
rinse the electrode tip with some solution to
be tested.
STORAGE
To minimize clogging and assure a quick
response time, the electrode glass bulb and
junction should be kept moist at any time.
Store the electrode with a few drops of
HI 70300 storage solution in the protective
cap (in its absence, use HI 7071 electrolyte
for single junction, or HI 7082 for double junc-
tion electrodes).
Follow the above "Preparation Procedure" be-
fore taking measurements.
Note: NEVER STORE THE ELECTRODE IN
DISTILLED WATER OR DRY.
AmpHel ® is a registered Trademark of "Hanna Instruments"