Hanna Instruments pH 210 - Manual (Page 11)

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ELECTRODE CONDITIONING & ELECTRODE CONDITIONING & ELECTRODE CONDITIONING & ELECTRODE CONDITIONING & ELECTRODE CONDITIONING &
MAINTENANCE MAINTENANCE MAINTENANCE MAINTENANCE MAINTENANCE
For refillable electrodes: For refillable electrodes: For refillable electrodes: For refillable electrodes: 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.
For faster response, unscrew the fill hole screw during measurements.
For AmpHel
For AmpHel For AmpHel For AmpHel For AmpHel ® ® ® ® ® electrodes: electrodes: electrodes: electrodes: electrodes:
If the electrode does not respond to pH changes, the battery is run
down and the electrode should be replaced.
MEASUREMENT
MEASUREMENT MEASUREMENT MEASUREMENT MEASUREMENT
Rinse the electrode tip with distilled water. Immerse the tip (bottom
4 cm /1½”) in the sample and stir gently for a few seconds.
For a faster response and to avoid cross-contamination of the samples,
rinse the electrode tip with a few drops of the solution to be tested,
before taking measurements.
STORAGE
STORAGE STORAGE STORAGE STORAGE PROCEDURE PROCEDURE PROCEDURE PROCEDURE PROCEDURE
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 and HI 7082 or HI 8082 for
double junction electrodes). Follow the Preparation Procedure on page
20 before taking measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED
WATER.
PERIODIC MAINTENANCE PERIODIC MAINTENANCE PERIODIC MAINTENANCE PERIODIC MAINTENANCE 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:
For refillable electrodes: For refillable electrodes: For refillable electrodes: 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). Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.
PREPARATION PROCEDURE PREPARATION PROCEDURE PREPARATION PROCEDURE PREPARATION PROCEDURE PREPARATION PROCEDURE
Remove the protective cap of the pH electrode.
DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal
with electrodes. They will disappear when rinsed with water.
During transport, tiny bubbles of air may form inside the glass bulb
affecting proper functioning of the electrode. These bubbles can be
removed by “shaking down” the electrode as you would do with a
glass thermometer.
If the bulb and/or junction is dry, soak the electrode in HI 70300 or
HI 80300 Storage Solution for at least one hour.