22
•
Dissolved O
2
Saturation
expressed in %
•
Dissolved O
2
Concentration
expressed in mg/l, corresponding to ppm
mg/l = ppm
•
Barometric pressure
•
During the measurement press the button
, in order to change the unit of
measurement.
•
Performing the measurement
Remove the protective cap of electrode, rinse it with distilled water; dab it with paper towel and dip in the
solution to analyse. Gently stir and wait until the value stability, when the icon
appears on the display,
take the reading.
•
Barometric pressure compensation
Since the measurement of the partial pressure of the dissolved oxygen is related to the barometric pressure,
this instrument is able to compensate each variation, thanks to the integrated barometric sensor.
In order to view the barometric pressure measured by the instrument, press the key
during
measurement and scroll through the measurement parameters: %O
2
↔
mg/l
↔
mbar.
Probe LDO70 maintenance
If the instrument does not calibrate or the 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 wash it 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 infiltration, 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%.
Note
: if even after maintenance the probe does not calibrate, then replace the luminophore with a new one.
•
Replacement of luminophore
The efficiency of the luminophore decreases with wear to the point that the instrument is no longer able to
calibrate itself, in this case it is necessary to replace it. 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 a new one supplied with a new luminophore;
4)
Screw the new luminophore ensuring an airtight seal.
