Delta HD2105.1, Operating Manual

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HD2105
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V2.3
N
OTES ON THE USE OF THE
pH
ELECTRODES
The average life of a pH electrode is about 1 year, depending on the use and maintenance.
The electrodes used at high temperatures or in strong alkaline environments normally have a shorter
life.
The new electrodes should be conditioned for half a day immersed in a 6.86pH or 4pH buffer.
Calibrate the electrode using buffer solutions close to the values to be measured. A new electrode
should always be calibrated at neutral pH (6.86pH) as first point, and at least in a second point.
Following are listed some problems that frequently occur and the possible solutions.
Wrong pH measure . Perform the following checks:
Check the diaphragm is not blocked and if necessary clean it using HD62PT solution.
Check the reference system is not polluted and, if the electrode is refillable, replace the electrolyte.
Check that the tip of the electrode has no air bubbles inside and that the electrode is sufficiently
immersed.
Even residues of dirt deposited on the membrane can alter the measure: use the solution for protein
cleaning
HD62PP .
Slow response and wrong measures . A possible cause can be the aging or the erosion of the
membrane, or a short-circuit in the connector.
Storage. Store the electrode immersed in the solution HD62SC .