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For refillable electrodes
If the fill solution (electrolyte) is more than 1 cm (½") below the fill
hole, add
HI 7082 3.5M KCl
electrolyte solution for double junction or
HI 7071 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 (4 cm / 1½") in the sample and stir gently for
approx. 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
HI 70300
storage solution or, in its absence, filling solution (
HI 7071
for single junction or
HI 7082
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 on the electrode body, replace the electrode. Rinse off any
salt deposits with water.
For refillable electrodes
Refill it with fresh electrolyte (
HI 7071
for single junction or
HI 7082
for double junction electrodes). Allow the electrode to stand upright for
1 hour.
Follow the Storage Procedure above.