Brandson 306118 Manual Del Usuario página 22

7. Minimum and maximum values of temperature and humidity
Press the "+" button to toggle the display between the minimum and maximum
values. The display cycle is: Maximum → Minimum → Back to normal display
mode.
If you press and hold the "+" button for 2 seconds while the maximum and min-
imum values are displayed, you can delete the maximum and minimum values
and restart the recording.
The recordings of the maximum and minimum values are automatically deleted
and re-recorded every day from 0:00 hrs.
8. Calibration of the CO2 concentration
Due to transport, vibration, ageing and other reasons, the detection accuracy of
the sensor may be reduced. Deviations are corrected by calibration. The device
has an automatic and a manual calibration option. It is advisable to use automat-
ic calibration. Alternatively, you can also carry out manual calibration. The two
methods are described below.
8.1 Automatic calibration
After starting the sensor, the minimum carbon dioxide concentration values
are stored for 48 hours in order to determine the basic value of the outdoor
atmospheric carbon dioxide concentration. The lowest carbon dioxide concen-
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