9
Note:
One short cut for users to revert
the Center and Zone to 1200& 400ppm
: In normal mode, press for 3 secs
till an audible beep and LCD should show
“ Back Home Done” .
RE-CALI
While the accuracy of this device is a
concern, you may use this function to
calibrate this device with outdoor fresh
atmospheric air in ~400ppm condition.
It is suggested to do calibration in sunny
day to ensure the fresh air is closed to
400ppm.
When entering setup mode, press keys
to select “Re-CALI”, then hold for
3 seconds unitl a beep and the chart will
read “Calibration”. Leave the sensor in
outdoor fresh air for 20 mins to complete
the calibration.
ENTER
ENTER
Do not calibrate the meter in the air
with unknown CO level. Otherwise, it
2
will be taken as 400ppm and leads to
inaccurate measurements.
Note:
The meter is calibrated at standard
400ppm CO concentration in factory.
2
.
Note:
To escape, press to terminate
without saving.
Make sure the device is far away from
CO2 source, not in direct sunlight, and
not exposed to water.
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