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ELECTRODE MAINTENANCE
PREPARATION
The HI 4010 fluoride electrode is shipped dry.
The HI 5313 reference electrode should be main-
tained wet with some storage solution in the protective
cap. Remove the protective cap from the reference
electrode.
Any salt deposit around the electrode tip is normal
and it will dissolve if rinsed with water.
If the junction of the HI 5313 reference electrode is
dry, soak the tip in HI 7082 solution for at least one
hour prior to operation.
If the bulb of the HI 4010 fluoride electrode is dry,
soak the tip in HI 4010-10 solution (10 ppm fluo-
ride) for at least 3 hours before using it.
STORAGE
The HI 4010 fluoride electrode must be stored dry to prolong its life.
After use, rinse it with deionized water, dry it attentively with a non-
abrasive cloth and store it dry.
The HI 5313 reference electrode should be kept wet for a rapid
response. After use, rinse the electrode with deionized water and store
it with a few drops of HI 7082 solution in the protective cap.
PERIODIC MAINTENANCE
Periodically check electrodes and cables. The cables should be intact
and show no sign of wear and tear. The electrode bulb and stem
should present no cracks (in which case it, must be replaced). The
connectors must be clean and dry. Rinse the reference electrode with
deionized water to wash away any salt deposits that there might be.
REFERENCE ELECTRODE CLEANING
General: immerse the reference electrode in HI 7061 gen-
eral cleaning solution for about one hour.
Protein: immerse the reference electrode in HI 7073 pro-
tein cleaning solution for about 15 minutes.
Oil and fat: rinse the electrode with HI 7077 cleaning solution.
HI 5313
FLUORIDE ELECTRODE CLEANING
General: Rinse the fluoride electrode with deionized water.
Protein, oil & fat: Clean the electrode tip with a cotton wool soaked
in alcohol, then rinse with deionized water.
IMPORTANT: After cleaning, rinse the fluoride electrode thoroughly
with deionized water and dry it attentively with a non-
abrasive cloth.
TROUBLESHOOTING
• Reading fluctuates: could be due to dirty or blocked reference
electrode junction. Follow the cleaning procedure above.
• Reading drifts: submerge the tip of the reference electrode in
HI 7082 solution at a temperature of 50-60°C for about 1 hour.
Afterwards, rinse with deionized water.
• No slope (meter always reads the same value): the bulb or
stem of the fluoride electrode might be cracked. Repeat the mea-
surement with a new fluoride electrode.
• Response (of the fluoride electrode) is sluggish: immerse the
fluoride electrode in HI 4010-10 solution for 3 hours.
BATTERY REPLACEMENT
When the batteries become weak, the "LOBAT"
indication is displayed to warn the user. It is
recommended to change the batteries as soon
as possible.
Battery replacement must only take place in a
safe area and using 1.5V AA batteries.
For replacing batteries, remove the two screws
on the rear of the instrument and replace all
four batteries with new ones, while paying
attention to the correct polarity.