Hanna Instruments HI 8711 - Manual (Page 39)

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CLEANING PROCEDURE
• General
Soak in HI 7061 general cleaning solution for
approximately 1 hour.
Removal of films, dirt or deposits on the membrane/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 thoroughly 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.
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 above "Cleaning Procedure"
----- Loss of shielding due to low electrolyte level (in refillable
electrodes only): refill with HI 7071 solution for single junction
or HI 7082 for double junction electrodes
• •• •• Dry Membrane/Junction: soak in HI 70300 storage solution for
at least 1 hour
• •• •• Drifting: soak the electrode tip in warm HI 7082 solution for one
hour and rinse the tip with distilled water; refill with fresh electrolyte
(HI 7071 for single junction and HI 7082 for double junction
electrodes)
• •• •• Low Slope: refer to the above "Cleaning Procedure"
• •• •• No Slope: check the electrode for cracks in glass stem or bulb
(replace the electrode if cracks are found)
• •• •• Slow Response/Excessive Drift: soak the tip in HI 7061 solution
for 30 minutes, rinse thoroughly in distilled water and then follow
the above "Cleaning Procedure"
• •• •• For ORP Electrodes: polish the metal tip with a light abrasive
paper (pay attention not to scratch the surface) and rinse
thoroughly with water.