Hanna Instruments HI 9026V - Manual (Page 9)

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pH ELECTRODE MAINTENANCE
Preparation
Remove the electrode protective cap. Do not be alarmed if any salt deposits are
present: this is normal with electrodes and they will disappear when rinsed with
water.
During transport tiny bubbles of air may have formed inside the glass bulb. The
electrode cannot function properly under these conditions. These bubbles can be
removed by "shaking down" the electrode as you would do with a glass
thermometer.
Sensitive bulb
To avoid clogging problems and ensure a fast response, the bulb must be kept
moist at any time. Store the electrode with few drops of HI 70300 storage
solution in the protective cap. NEVER USE DISTILLED OR DEIONIZED WATER FOR
STORING PURPOSES.
Periodic maintenance
Inspect electrode and cable. The cable used for the connection to the meter must
be intact and there must be no points of broken insulation. The connector must
be perfectly clean and dry. If any scratches or cracks are present, replace the
electrode.
Refilling the electrode
ALWAYS VERIFY THE ELECTROLYTE LEVEL.
If the electrolyte level is more than 2 cm below
the refilling hole, unscrew and remove the refill-
ing hole cap.
Add the 3.5M KCl electrolyte solution (HI 7082)
by using the supplied syringe. Tighten back the
cap. Wait at least 1 hour before using the
electrode.
Note: To prevent damage to the electrode, remove the pH electrode from the
sample before turning the meter off. With the meter OFF, detach the
electrode from the meter and immerse it in the storage solution.
If batteries become weak, the display will flash the
battery symbol to advise the user that approximately
25 hours of working time is left. It is recommended to
replace batteries soon.
Moreover, when the battery level is too low to ensure
reliable readings, at start-up the display will show “0
bAtt” for a few seconds, then the meter automatically
turns off.
Battery replacement must only take place in a safe area and using the battery
type specified in this instruction manual.
To replace rundown batteries, remove the rear cover
of the instrument and substitute all four 1.5V AA
alkaline batteries with new ones, while paying atten-
tion to the correct polarity. Reattach the cover and
tighten the two screws.
BATTERY REPLACEMENT
• Blinking full scale value: reading is out of range.
• Blinking “°C” (or “°F”): MTC mode or temperature probe not connected
or broken.
• Meter shuts off:
- check if auto-off feature is enabled; in this case meter shuts off after 20
minutes of non-use.
- dead battery; replace battery.
• "Er0, Er1, Er2" message: internal technical problem. Contact your dealer
or the nearest Hanna Service Center.
• "Clr" message, for 1 second at start-up: pH calibration cleared. Contact
your dealer or the nearest Hanna Service Center.
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