User Guide

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Removal of films, dirt or deposits on the
membrane/junction:
-
Protein Soak in Hanna HI 7073 or HI 8073
Protein Cleaning Solution for
15 minutes.
-
Inorganic Soak in Hanna HI 7074 or HI 8074
Inorganic Cleaning Solution
for 15 minutes.
-
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 a solution containing 2%
ISA (see page 22), refill (if necessary)
the reference chamber with fresh electro-
lyte (HI8093) and soak the electrode in
a solution very close to the next
sample to be measured for at least 1
hour before taking measurements.
NEVER RUB OR BLOT DRY
THE ELECTRODE.
TROUBLESHOOTING
Evaluate your electrode performance based
on the following.
• Noise (Readings fluctuate up and down)
could be due to:
- Clogged/Dirty Junction: Refer to the
Cleaning Procedure above.
- Loss of shielding due to low electrolyte
level: HI 8093
mannacl_r1.P65
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• Dry Membrane/Junction: Soak it over-
night in HI7081 or HI8081 (30.0 g/L NaCl)
or HI7086 or HI8086 (23 g/L Na) before
use.
• Drifting: Soak the electrode tip in warm
Hanna Solution HI8093 for one hour. Refill
with fresh HI 8093 electrolyte solution.
• Low Slope: Refer to the cleaning proce-
dure above.
• No Slope: Check the electrode for cracks
in glass stem or bulb and replace the
electrode.
• Slow Response/Excessive Drift: Soak
the tip in Hanna Solution HI7061 or HI 8061
for 30 minutes, rinse thoroughly in a solu-
tion with 2% of ISA (see page 22) and
then follow the Cleaning Procedure above.