pH/mV Temperature Meter
430-020
10 9907X0088 Issue 2
If ‘Over Range pH Err’ is displayed the readings are higher than 16pH or
1000mV.
If ‘Under Range pH Err’ is displayed the readings are below -2pH or -
1000mV.
If ‘No Probe Err’ is displayed the pH electrode is not connected.
6
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 at ele@eleint.co.uk.
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.
