Hanna Instruments HI 9910 - Manual (Page 33)

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ELECTRODE CONDITIONING ELECTRODE CONDITIONING ELECTRODE CONDITIONING ELECTRODE CONDITIONING ELECTRODE CONDITIONING
& MAINTENANCE & MAINTENANCE & MAINTENANCE & MAINTENANCE & MAINTENANCE
PREPARATION
Remove the 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 (membrane). Shake down the electrode as you would do with a
glass thermometer to remove these bubbles.
If the bulb and/or junction are dry, soak the electrode in a
HI 70300
Storage Solution overnight.
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. This can be achieved by installing the electrode in such a way
that it is constantly in a well filled with the sample (stream or tank).
When not in use, pour a few drops of
HI 70300 Storage Solution or,
in its absence, HI 7007 pH 7.01 Buffer Solution in the protective
cap and replace it on the electrode.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED
WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for the connection
to the controller 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.
CLEANING PROCEDURE
Soak in Hanna HI 7061 General Cleaning Solution for ½ hour.
For more specific cleaning procedures, refer to the electrode’s instruc-
tion manual.
IMPORTANT: After performing any of the cleaning procedures rinse
the electrode thoroughly with distilled water and recalibrate the
controller.