Hanna Instruments Edge - Page 77

Maintenance
77
For rellable electrodes:
If the lling solution (electrolyte) is more than 2½ cm (1”) below the ll hole,
add HI 7082 or HI 8082 3.5M KCl Electrolyte Solution for double junction.
Unscrew the ll hole cover during measurements so the liquid junction
maintains an outward ow of electrolyte.
Measurement
Rinse the electrode tip with distilled water. Submerse the tip (3 cm /1¼”) 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 Procedure
To minimize clogging and ensure a quick response time, the glass bulb and the
junction should be kept wet 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 7082 or HI 8082
for double junction electrodes).
Follow the preparation procedure 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
in the cable or cracks in the electrode stem or bulb. Connectors must be
perfectly clean and dry. If any scratches or cracks are present, replace the
electrode. Rinse o any salt deposits with water.
For rellable electrodes: Rell the reference chamber with fresh electrolyte
(HI 7082 or HI 8082 for double junction electrodes). Allow the electrode to
stand upright for 1 hour.
Follow the Storage Procedure above.
pH Probe
Maintenance