20
•
Place the probe in air with the membrane facing downwards and wait for 2 minutes. Then, connect the
sensor to the device.
•
In measure mode, press the key
to enter in calibration mode.
On the display, it appears the string “
POINT oxy 100.0
”; the device will look for the value %O
2
= 100 %.
Keep the sensor in air in a vertical position with the membrane facing downwards.
•
When the signal is stable, the red bands will be replaced by the stability icon
.
Press the button
, as indicated by the string “
PRESS OK
”.
On the display, the measured value flashes, then the sensor and finally the beacker
appears
below on the left and indicates that the instrument is calibrated on value 100%O
2
.
•
After the calibration, the instrument enters in measure mode automatically.
•
Calibration with zero oxygen standard
Normally, it is enough to calibrate the instrument in the air at 100% as explained previously. However,
sometimes it is also necessary to calibrate at 0%, for example when:
•
A probe or luminophore is replaced by a new one
•
The probe is not used for a long period of time (3-6 months)
•
The instrument does not calibrate at 100%, in this case calibrate it before at 0%.
•
The instrument does not measure correctly
For calibration at 0%, proceed as follows:
Turn the instrument on, rinse the probe in distilled water; dry the probe thoroughly with paper towel and
proceed as follows:
•
Put the probe in the Zero Standard Oxygen and wait for 5 minutes.
•
In measure mode, press the button
, remain in Menu
DO SETTINGS P5.0
and confirm pressing
the button
again.
•
Press the button
again, confirm the entry into submenu
CAL 0 P5.1
.
•
On the display, the string “
POINT oxy 0.0
” appears; the device will search for the value %O
2
= 0%.
•
Gently stir the probe in the Standard and eliminate any air bubbles under the membrane, moving
the sensor.
•
The scrolling on the display of four red bands
means that the measurement is not stable yet.
•
Consider the measurement truthful only when the stability icon appears
.
•
Confirm the value by pressing the button
.
•
The instrument automatically returns to measure mode.
•
The beaker icon
appears at the bottom left, indicating that the instrument is calibrated on value
0% O
2
.
