52
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 pH 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.
Take care that the sleeve holes of the EC probe are completely submersed.
Tap the probe repeatedly to remove air bubbles that may be trapped
inside the sleeve.
STORAGE PROCEDURE
To minimize clogging and assuring 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 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 on page 53 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.
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