Brandson 306118 Manual Del Usuario página 23

tration values are stored for 7 days in order to determine the basic value of the
atmospheric carbon dioxide concentration (approx. 400 ppm).
Make sure that the sensor is in an environment where the atmospheric level is
the same as outdoors (approx. 400 ppm) during this time.
The automatic calibration function is suitable for office, home and other
environments that are isolated from weather. It is not suitable for agricultural
greenhouses, farms, warehouses and other places.
8.2 Manual calibration of CO2 concentration
During calibration, the product must be positioned in an environment with a
CO2 concentration equal to the outside air (approx. 400 ppm) to ensure that the
CO2 concentration in the environment is stable.
In normal display mode, press and hold the "+" button for 2 seconds to enter
manual calibration mode. "CAL" flashes in the display. At this point you can press
"Settings" to confirm the entry or press the "+" key or not press any key for 30
seconds to exit the calibration mode.
The duration of manual calibration is about 20 minutes. During calibration, you
can press the "+" button to cancel and exit the mode in advance.
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