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9.7
Manual CO
Calibration
Exit Manual Calibration Menu
without performing a calibration
-
The meter is calibrated at standard 400 ppm CO
2
concentration in factory. It is suggested to do man-
ual calibration regularly and especially before using
it for the first time to maintain good accuracy. (Use
power bank if no power connection available). The
calibration will last about 5 minutes.
When accuracy becomes a concern after a long
time usage or other special conditions, return to
dealers for standard calibration.
ATTENTION!
Do not calibrate the meter in the air with unknown
CO
level. Otherwise, it will be taken as 400 ppm
2
and this fact leads to inaccurate measurements.
The manual calibration is suggested to be done
outdoor, e.g. on an exterior window ledge, on a
sunny day where CO
NOTE!
Do not calibrate on rainy days, because the high
humidity will affect the CO
Do not calibrate the meter in places crowded
•
with people or close to where exist high CO
concentration such as ventilating outlets or
fireplaces.
To exit the Manual Calibration Menu without
•
performing a calibration, press the Ξ-key.
"Exit" appears in the display.
Confirm with the ●-key to return to the meas-
•
urement display.
If you want to carry out the calibration, pro-
•
ceed as follows:
Table des matières
level is around 400 ppm.
2
level in air.
2
EN
2
2
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