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pH electrode 50 51
Introduction
The 50 51 is a pH low maintenance electrode, as it does not
require monitoring of electrolyte level.
The open diaphragm allows direct contact between the sample
and the reference electrolyte. This avoids the classical problem
of diaphragm clogging.
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
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 leave the electrode immersed in solutions with pH < 2.
• 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 contamination.
Proteins: Immerse the electrode in 2% NaOH solution during ap-
prox. 20 min.
Fats, oils: Wash the electrode with ethanol or soapy tap water at
approx. 40ºC.
Afterwards, rinse the electrode with plenty of distilled water and
leave for rest in the reference electrolyte.
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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