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PERIODIC MAINTENANCE
Inspect the electrode and the cable . The cable used for the
connection to the controller must be intact and there must
be no points of broken insulation on the cable or cracks
on the electrode stem or bulb .
Connectors must be perfectly clean and dry . If any scratches
or cracks are present, replace the electrode . Rinse off any
salt deposits with water .
CLEANING PROCEDURE
General
Soak in Hanna Instruments Office
HI7061
General Cleaning Solution for approximately
½ hour .
Removal of films, dirt or deposits on the membrane/junc-
tion:
Protein
Soak in Hanna Instruments Office
HI7073
Protein Cleaning Solution for 15 minutes .
Inorganic
Soak in Hanna Instruments Office
HI7074
Inorganic Cleaning Solution for 15 minutes .
Oil/grease
Rinse with Hanna Instruments Office
HI7077
Oil and Fat Cleaning Solution .
IMPORTANT
After performing any of the cleaning procedures rinse
the electrode thoroughly with distilled water and soak the
electrode in
HI70300
Storage Solution for at least 1 hour
before reinstalling it .
TROUBLESHOOTING
Evaluate your electrode performance based on the fol-
lowing .
• Noise (Readings fluctuate up and down) could be due to
clogged or dirty junction: refer to the Cleaning Procedure
above .
• 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 Instruments
Office Solution
HI7082
for one hour and rinse tip with
distilled water .
• Low Slope: refer to the cleaning procedure above .
