Hach 52 12 Manual Del Usuario página 10

pH electrode 52 12
Introduction
The 52 12 is a pH electrode, with large
ring diaphragm of PTFE.
These are low maintenance electrodes, as
they do not require monitoring of electrolyte
levels.
Electrode preparation
Remove the storage protector containing
electrolyte by unscrewing it
Verify that there are not air bubbles inside
the membrane
by shaking the electrode as a clinical ther-
mometer.
Calibration
See pH-meter instruction manual.
Measurements. Recommendations
• During calibration and measurement the
buffers and the samples must be slight-
ly stirred. The stirring speed should be
identical in both cases.
• The sample must cover the electrode's
diaphragm
• After measurement, immediately rinse
the electrode with distilled water. Dry it
with soft tissue, only by contact, without
rubbing.
• Between measurements the electrode's
membrane should be immersed in aque-
ous solution. The most appropriate place
is the storage protector with some elec-
trolyte.
Do not leave the electrode immersed
in distilled water.
Maintenance
• Maintain the membrane's surface clean
. Protect it from friction or knocking.
• When an electrode gets contaminated,
the simple rinsing with distilled water is
not sufficient. The most suitable cleaning
solution is one which acts in a more selec-
tive way over the contamination (look for
HACH regeneration solutions).
• Re-hydration. A "dry" electrode recovers
by immersing it in HACH cleaning elec-
trode solution, or in diluted HCl solution
for several hours. It is recommended to
read the information supplied with the
electrode's regenerating solutions.
Life of an electrode
The average life expectancy of a pH elec-
trode is approximately one year depend-
ing on the working conditions.
An electrode used for more than six months
that does not response appropriately after
regeneration, must be replaced by a new
one.
If an electrode has too short life
span, less than three months, ask us
about it. Probably there are more suitable
electrode for the application.
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