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Check that the cell used is suitable for the measurement range. Check that the cell is not dirty, that
there are no air bubbles inside it. Repeat the calibration using the proper not contaminated
standard.
Slow response or instability
.
Check that the cell is not dirty, that there are no traces of oil or air bubbles inside it. If you work with
a Platinum cell, new platinum-coating of the electrode could be necessary.
Calibration not accepted
.
Check that the standard solutions are in good condition, and that the calibration solution
temperature is within the range 15…35°C.
Measurement of the dissolved Oxygen
The body of the polarographic probe is in POM, the body of the galvanic probe is in Epoxy, the
membrane is in 25
μ
PTFE.
During use, control the compatibility of these materials with the liquid that you want to measure.
The probe must be kept wet by using its protection.
Regularly check that no obstructions are present on the membrane.
Do not let hands touch the membrane.
During measurement, make sure the membrane is not coming into contact with objects that could
tear it off.
