G 1610
Measurement Basics | 5
B-H86.0.2X.DK2-3.0
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NOTE
The sensor evaluation is updated by the measuring device after a successfully per-
formed calibration of the oxygen sensor.
The nominal service life can be reduced significantly due to use.
Influential factors include:
- Storage / operating temperature
- Contamination of the measured water
- Mechanical stress of the sensor membrane
- Storage in dry air
- Continuous use in elevated carbon dioxide concentrations.
5.1.4
Operating position
The oxygen sensor should be arranged vertically upwards with the connecting cable.
A slight angle of inclination does not impair the measurement.
5.1.5
Residue
As a reaction product in operation, there will be lead oxide (red and brown
– from the
reaction with oxygen) and lead carbonate (white
– from the reaction of carbon dioxide)
in the inner of the sensor. These substances may accumulate visibly at the membrane,
but usually have now negative effect on the operability. Within a maintenance cycle the
residues can be washed off the membrane nearly completely.
Significant deposits on the membrane and
matt
platinum
electrode.
Deposits already have an effect on the measurement.
=> Carry out maintenance to remove these.
Slight deposits on the edge of the electrode, predominantly
blank
platinum electrode.
No significant influences on the measurement to be expected.
=> Maintenance not absolutely necessary..
Deposits on the membrane,
bare
platinum electrode.
=> no maintenance required.
Polished platinum electrode during maintenance.