Hach 50 52 Manual Del Usuario página 10

pH electrode 50 52
Introduction
The 50 52 is a pH electrode, with large ring diaphragm of PTFE,
to be used with the HACH portable pH-meter.
These are low maintenance electrodes, as they do not require
monitoring of electrolyte levels. This model is supplied with a
"working protector", protecting the electrode against knocks.
Electrode preparation
Remove the storage protector containing electrolyte by unscrewing
it and put the working protector on its place (see Fig. A).
MP-5 connector (IP 67). Connect and disconnect by pushing.
Do not unscrew it.
Calibration
All pH electrodes must be calibrated with buffer solutions before
measuring.
See pH-meter instruction manual.
Measurements. Recommendations
• During calibration and measurement the buffers and the sam-
ples must be slightly stirred. The stirring speed should be
identical in both cases. In field measurements, these types of
electrodes allow stirring the sample directly holding the elec-
trode by the handle.
• 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 aqueous solution. The most appropriate place is
the storage protector with some electrolyte.
WARNING
• Do not leave the electrode immersed in distilled water.
• Do not bend the cable on the handle level.
• Never unscrew the MP-5 connector.
Maintenance
• Maintain the membrane's surface
• When an electrode gets contaminated, the simply rinsing with
distilled water is not sufficient. The most suitable cleaning solu-
tion is which acts in a most selective way over the contamina-
tion (see HACH regeneration solutions).
• Re-hydration. A "dry" electrode recovers by immersing it in
HACH cleaning electrode solution, code C20C370, or in diluted
HCl solution for several hours. It is recommended to read the
information supplied with the electrodes regenerated solutions.
Life of an electrode
The average life expectancy of a pH electrode is approximately
one year depending 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 elec-
trode for the application.
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clean.
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