Hanna Instruments HI 84529 - Manual (Page 45)

www. hannainst .com 45 Maintenance
Storage Procedure
To assure a quick response time, the glass bulb should be kept moist and not
allowed to dry out. Replace the solution in the protective cap with a few drops
of HI 70300 or HI 80300 Storage Solution. The HI 5315 Reference may be
stored with its black cap and Fill hole covered. Rinse and refill before using.
Follow the Preparation Procedure on page 20 before taking measurements.
Periodic Maintenance
Inspect the electrodes and the cables. The cable used for connection to the
instrument 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 distilled/deionized water.
pH Cleaning Procedure
General Soak in Hanna HI 7061 or HI 8061 General Cleaning
Solution for approximately ½ hour.
Milk deposits Soak in Hanna HI 70640 Cleaning Solution for milk
deposits for approximately ½ hour (pH half cell only).
Protein Soak in Hanna HI 7073 or HI 8073 Protein Cleaning
Solution for 15 minutes.
IMPORTANT: After performing any of the cleaning procedures, rinse the
electrode thoroughly with distilled or deionized water and soak the electrode
in HI 70300 or HI 80300 Storage Solution for at least 1 hour before taking
measurements.
Reference Electrode Cleaning
Drain the old fill solution, rinse with a few drops of HI 7072 solution, drain,
then refill with HI 7072 solution. Do not use an electrode if crystallized salts
are visible inside the electrode. Drain electrode, disassemble and rinse internal
body with deionized water. Reassemble and refill with fresh fill solution. The
internal chamber of this electrode is gell filled. If the electrode has been left dry
for long periods of time the gel may be dehydrated and stable measurements
may not be obtainable. Disassemble electrode and soak internal assembly in
HI 7072 fill solution. Verify the ceramic is wetted by the fill solution. Warming
the solution slightly (50°C) before soaking will hasten this process. Permit the
electrode to cool completely while immersed in this solution.
Electrode
Conditioning
and
Maintenance