SECTION 5 - Care and Maintenance
Over time the electrode sensor will degrade, but regular calibrating, cleaning and
the correct storage will prolong its life. The epoxy bodied combination electrode
supplied with this instrument is suitable for the majority of tests carried out in
aqueous solutions. For other applications, such as low ionic strength, Tris buffers,
high temperatures and strongly acidic solutions a more suitable pH/reference
electrode pair may be required. Details or advice are supplied on request
([email protected]).
If the electrode readings are slow or erratic, place the electrode into cleaning
solution or 7.00 pH solution for at least half an hour to one hour before testing
again. The temperature probe and pH electrodes are not waterproof and cannot
be fully immersed in water. It is recommended that the instrument is calibrated
daily to achieve consistent and accurate results.
The following general guidelines indicate the care and maintenance required:
Always rinse the pH electrode with cleaning solution or deionised water before
next use.
Electrodes should be stored:
●
away from direct sunlight
●
in a vertical position
●
within their specified temperature range
Always ensure the electrode is used within its specified temperature range. Ageing
of electrodes used above their specified temperature is rapid and irreversible.
DO NOT
touch the sensitive glass pH membrane or reference junction. Excess
droplets of solution may be removed by gently blotting with filter paper or tissue.
DO NOT
rub the electrode as this may induce an electrostatic charge.
During use ensure the electrode is rinsed between each measurement to eliminate
the contamination of solutions.
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