Hanna Instruments HI 98401 - Manual (Page 4)

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FUNCTIONAL DESCRIPTION
1) Temperature probe connector
2) Reference electrode connector
3) BNC connector for fluoride electrode
4) Liquid Crystal Display (LCD)
5) ON/OFF button
6) CAL button
7) BUF button
8) CFM button
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FLUORIDE ELECTRODE CLEANING
General:
Rinse the fluoride electrode with deionized water.
Protein, oil and 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
measurement with a new fluoride electrode.
• Response (of the fluoride electrode) is sluggish: immerse the
fluoride electrode in HI 70702 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.