35
For refillable electrodes:
If the filling solution (electrolyte) is more than 2½ cm (1”) 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 faster response, unscrew the fill hole screw during measurements.
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. 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 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
HI70300
or
HI80300
Storage Solution or, in its absence, Filling Solution (
HI7071
or
HI8071
for single junction and
HI7082
or
HI8082
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
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 and
HI7082
or
HI8082
for double junction electrodes).
Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.