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For refillable electrodes:
If the filling solution (electrolyte) is more than 1 cm (½") below the
fill hole, add
HI7082 or HI8082 3,5M KCl Electrolyte Solution
for
double junction or
HI7071 or HI8071 3,5M KCl+AgCl Electrolyte
Solution
for single junction electrodes.
For a faster response, unscrew the fill hole screw during measure-
ments.
For AmpHel electrodes:
If the electrode does not respond to pH changes, the battery is run
down and the electrode should be replaced.
MEASUREMENT
Rinse the electrode tip with distilled water.
Immerse the tip (4 cm /1½") in the sample and stir gently for at least
30 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
To minimize clogging and assuring 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
HI70300
or HI80300 Storage Solution
or, in its absence,
Filling Solution
(
HI7071 or HI8071
for single junction or
HI7082 or HI8082
for
double junction electrodes).
Follow the Preparation Procedure above before taking measurements.
Note:
NEVER STORE THE ELECTRODE IN DISTILLED WATER OR DRY.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for connection to
the meter 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:
Refill the reference chamber with fresh electrolyte (
HI7071 or HI8071
for single junction or
HI7082 or HI8082
for double junction elec-
trodes). Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.