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CLEANING PROCEDURE
Soak in Hanna HI 7061 General Cleaning Solu-
General
tion for approximately ½ hour.
Removal of films, dirt or deposits on the membrane/junction:
Soak in Hanna HI 7073 Protein Cleaning Solu-
Protein
tion for 15 minutes.
Soak in Hanna HI 7074 Inorganic Cleaning
Inorganic
Solution for 15 minutes.
Rinse with Hanna HI 7077 Oil and Fat Clean-
Oil /grease
ing Solution.
IMPORTANT: After performing any of the cleaning procedures rinse
the electrode thoroughly with tap water and soak the electrode in
HI 70300 Storage Solution for at least 1 hour before taking a
measurement.
TROUBLESHOOTING
Evaluate your electrode performance on pH measurements based on
the following.
• Noise (Readings fluctuate up and down) could be due to:
- Clogged/Dirty Junction: Refer to the Cleaning Procedure
above.
• Dry Membrane/Junction: Soak in Storage Solution HI 70300
for at least 1 hour.
• Drifting: Soak the electrode tip in warm Hanna Solution HI 7082
for one hour and rinse tip with distilled water (refill with fresh
HI 7071 for single junction electrodes and HI 7082 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.
• Slow Response/Excessive Drift: Soak the tip in Hanna Solu-
tion HI 7061 for 30 minutes, rinse thoroughly in distilled water
and then follow the Cleaning Procedure above.
Note: for field applications, it is always recommended to keep a spare
electrode handy. When anomalies are not resolved with simple
maintenance, change the electrode (and recalibrate the meter)
to see if the problem is alleviated.
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