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4.5 Salinity compensation (manual)
The salinity of the sample to be measured influences the dissolved oxygen partial pressure.
For a correct measurement you must set the salinity value of the sample. If you make oxygen
measurements on salt water or sea water it is important to correct the measurement by setting the salinity
value indicative of the sample.
The value set by default is 0 ppt, to change access to P5.2 parameter of the setup menu and set the
desired value between 0 ... 50ppt.
The average salinity of sea water is 35ppt.
4.6 Automatic temperature Compensation ( ATC)
The measurement of the partial pressure of the oxygen is strongly influenced by temperature. This
instrument allows you to compensate for the change of the measurement made by the temperature
thanks to a built in temperature sensor, the instrument will automatically recognize the presence and the
display shows the ATC icon. During the measurements it is good to always check that the measured
temperature is stable and aligned with the sample.
5. Maintenance of the probe LDO70
If the instrument does not calibrate or reading does not stabilize, it is necessary to perform a maintenance
of the probe in the following way:
1) Check that the luminophore is clean, in case rinse externally with water.
2) The luminophore must be intact, undamaged, and without holes.
3) Unscrew the luminophore and check that the inside is dry, free from condensation and infiltration.
If there is condensation or seepage, check the integrity of the O-ring seal of the luminophore and,
if necessary, replace it. Dry thoroughly with a paper towel and screw the luminophore ensuring an
airtight seal.
After the maintenance make a new Calibration in air at 100%.
If even after the maintenance the probe does not calibrate then replace the luminophore with a new one.
5.1 Replacing the luminophore
The efficiency of the luminophore decreases with wear to the point that the instrument is no longer able to
calibrate itself, in which case its replacement is necessary. To replace the luminophore proceed as
follows:
1) Unscrew the luminophore.
2) Check the integrity of the inside of the probe.
3) Replace the O-ring with the new one supplied with new luminophore.
4) Screw the new luminophore ensuring an airtight seal.
After the maintenance make a new Calibration of the oxygen sensor.
OXY 70
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