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For refillable electrodes**:
Refill the electrode with fresh electrolyte (HI7071 for single junction or
HI7082 for double junction electrodes). Allow the electrode to stand
upright for 1 hour. Follow the Storage Procedure above.
CLEANING PROCEDURE
General Soak in Hanna HI7061 General Cleaning Solu-
tion for approximately ½ hour.
Removal of films, dirt or deposits on the membrane/junction:
Protein Soak in Hanna HI7073 Protein Cleaning Solu-
tion for 15 minutes.
Inorganic Soak in Hanna HI7074 Inorganic Cleaning Solu-
tion for 15 minutes.
Oil/grease Rinse with Hanna HI7077 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 Storage Solution for at
least 1 hour before reinstalling it.
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
electrodes only): refill with HI7071 for single junction or
HI7082 for double junction electrodes.
• Dry Membrane/Junction: Soak in Storage Solution HI70300
for at least 1 hour. Check to make sure the installation is such as
to create a well for the electrode bulb to constantly remain moist.
• Drifting: Soak the electrode tip in warm Hanna Solution
HI7082 for one hour and rinse tip with distilled water (refill with
fresh HI7071 for single junction electrodes and HI7082 for double
junction electrodes if necessary).
• Low Slope: Refer to the cleaning procedure above.
• No Slope: - Check the electrode for cracks in glass stem or
bulb (replace the electrode if cracks are found).
- Make sure cable and connections are not dam-
aged nor lying in a pool of water or solution.
**For industrial applications, gel-filled electrodes are preferable due to lesser maintenance requirements.
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