13
For refillable electrodes:
If the fill solution (electrolyte) is more than 2½ cm (1") below the fill
hole, add
HI7082
3.5M KCl electrolyte solution for double junction
or
HI7071
3.5M KCl+AgCl electrolyte solution for single junction
electrodes. For a 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. 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
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 protective cap with a few drops of
HI70300
storage
solution or, in its absence, electrolyte solution (
HI7071
for single junc-
tion, or
HI7082
for double junction electrodes). Follow the Preparation
Procedure above before taking measurements.
NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect electrode and 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.
For refillable electrodes:
Refill the reference chamber with fresh electrolyte (
HI7071
for single
junction or
HI7082
for double junction electrodes). Allow the electrode
to stand upright for 1 hour.
Follow the Storage Procedure above.
