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pH electrode 50 10
Introduction
The 50 10 is a Low Cost pH electrode for general use. Low main-
tenance electrode, as it does not require monitoring of electrolyte
level. Suitable for routine measurements.
Electrode preparation
Remove the storage protector containing electrolyte by unscrew-
ing it
. Verify that there are not air bubbles inside the mem-
brane
They can be removed by shaking the electrode as a
clinical thermometer.
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 iden-
tical in both cases.
• The sample must cover the electrode's diaphragm
• After measurement, 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.
Do not leave the electrode immersed in distilled water.
Maintenance
• Maintain the membrane's surface clean
tion or knocking.
• When an electrode gets contaminated, the simple rinsing with
distilled water is not sufficient. The most suitable cleaning solu-
tion is one which acts in a more selective way over the contami-
nation (look for HACH regeneration solutions).
• Re-hydration. A "dry" electrode recovers by immersing it in
HACH cleaning electrode solution, code C20C370, or in di-
luted HCl solution for several hours. It is recommended to read
the information supplied with the electrode's regenerating so-
lutions.
Troubleshooting
... the pH-meter always measures the same pH value.
Short circuit in the electrode or connector.
Substitute the electrode.
... unstable reading.
Air bubble in the membrane.
Shake the electrode as a thermometer.
... impossible to perform calibration.
... very slow response.
Dirt on the diaphragm or the membrane.
De-hydrated membrane.
Electrode ageing or wear.
Clean, regenerate or substitute the electrode.
Storage
Place the electrode in the storage protector
10
.
. Protect it from fric-
with KCl 3M.
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