27
These bubbles can be removed by "shaking down" the electrode as
you would do with a glass thermometer.
If the bulb and/or junction are dry, soak the electrode in HI 70300
Storage Solution for at least one hour.
For refillable electrodes**:
If the refill 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 elec-
trodes.
For AmpHel
®
electrodes:
If the electrode does not respond to pH changes, the battery is run
down and the electrode should be replaced.
TEST MEASUREMENT
Rinse the electrode tip with distilled water.
Immerse the tip (bottom 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 the solution to be tested, before taking
your 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. This can be achieved by installing the electrode in such a way
that it is constantly in a well filled with the sample (stream or tank).
When not in use, replace the solution in the protective cap with a few
drops of HI70300 Storage Solution or, in its absence, HI7007
pH 7.01 Buffer Solution.
Follow the Preparation Procedure above 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 the connection
to the controller 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.
AmpHel
®
is a registered Trademark of "Hanna Instruments"
**For industrial applications, gel-filled electrodes are preferable due to lesser maintenance requirements.
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