Hanna Instruments HI 98170 - Manual (Page 42)

4 2
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
® electrodes:
If the electrode does not respond to pH changes, the battery run down and
the electrode should be replaced.
MEASUREMENT
Rinse the pH 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.
See that the sleeve holes of the ORP probe are completly submerged.
STORAGE PROCEDURE
To minimize clogging and assure a quick response time, the glass bulb and the
junction of pH electrode 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 41 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.
pH Probe Maintenance
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.