User Guide

33
tions. 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 HI70300 or HI 80300 Storage
Solution for at least one hour.
For refillable electrodes:
If the filling solution (electrolyte) is more than
1 cm (½") below the fill hole, add HI 7082 or
HI 8082 3,5M KCl Electrolyte Solution for
double junction or HI 7071 or HI 8071 3,5M
KCl+AgCl Electrolyte Solution for single
junction electrodes.
For a faster response, loosen 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 at least 30 seconds.
For a faster response and to avoid cross
contamination of the samples, rinse the elec-
trode 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 junc-
tion should be kept moist and not allowed to
dry out.
Replace the solution in the protective cap
with a few drops of HI 70300 or HI 80300
Storage Solution or, in its absence, Filling
Solution (HI7071 or HI 8071 for single junc-
AmpHel
®
is a registered Trademark of "Hanna Instruments"