Hanna Instruments HI 221 - Manual (Page 32)

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For Refillable Electrodes:
If the filling solution (electrolyte) is more than 2½ cm (1") below the fill hole,
add HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for double junction or
HI 7071 or HI 8071 3.5M KCl+AgCl Electrolyte Solution for single junction
electrodes using a plastic refilling pipette (HI 740157).
As recommended by the LCD message on instrument on start-up, remove or
loosen the fill hole screw on the electrode for better performance.
STORAGE
To minimize clogging and assure a quick response time, the glass bulb and
the junction 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 or, in its absence, Filling Solution (HI 7071 or
HI 8071 for single junction or HI 7082 or HI 8082 for double junction
electrodes). Follow the Preparation Procedure on page 31 before taking
measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. 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 water.
For Refillable Electrodes:
Refill the reference chamber with fresh electrolyte (HI 7071 or HI 8071 for
single junction or HI 7082 or HI 8082 for double junction electrodes) using a
plastic refilling pipette (HI 740157). Allow the electrode to stand upright for
1 hour.
Follow the Storage Procedure above.
CLEANING PROCEDURES
• General
Soak in HANNA HI 7061 or HI 8061 General Clean-
ing Solution for approximately 30 minutes.
• Protein Soak in HANNA HI 7073 or HI 8073 Protein Clean-
ing Solution for 15 minutes.
• Inorganic Soak in HANNA HI 7074 Inorganic Cleaning Solu-
tion for 15 minutes.
• Oil/grease Rinse with HANNA HI 7077 or HI 8077 Oil and Fat
Cleaning Solution for approx. 30 seconds.