Hanna Instruments HI 9017 - Manual (Page 52)

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CLEANING PROCEDURE
General Soak in Hanna HI7061 or HI8061 General Cleaning
Solution for approximately 1 hour.
Removal of films, dirt or deposits on the membrane/junction:
- Protein Soak in Hanna HI7073 or HI8073 Protein Cleaning So-
lution for 15 minutes.
- Inorganic
Soak in Hanna HI7074 or HI8074 Inorganic
Cleaning Solution for 15 minutes.
- Oil/grease
Rinse with Hanna HI7077 or HI8077 Oil and
Fat Cleaning Solution.
IMPORTANT: After performing any of the cleaning procedures rinse
the electrode thoroughly with distilled water, drain and 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.
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 (in refillable elec-
trodes only): refill with fresh HI7071 or HI8071 for single junction
or HI7082 or HI8082 for double junction electrodes.
• Dry Membrane/Junction: Soak in Storage Solution HI70300
or HI80300 for at least 1 hour.
• Drifting: Soak the electrode tip in warm Hanna Solution HI7082
or HI8082 for one hour and rinse tip with distilled water. Refill
with fresh HI7071 or HI8071 for single junction electrodes and
HI7082 or HI8082 for double junction electrodes.
• Low Slope: Refer to the cleaning procedure 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 HI8061 for 30 minutes, rinse thoroughly in distilled
water and then follow the Cleaning Procedure above.