Calibration (Wöhler FA 430 only)
Carry out manual calibration on a sunny day out-
side in the fresh air, for example on the outside
windowsill, when the CO
2
concentration is approx.
400 ppm.
NOTE!
A rainy day is not suitable due to the high air hu-
midity, and because it can affect the CO
2
concen-
tration in the air.
Locations with high levels of CO
2
concentration
are not suitable places to calibrate the fan ane-
mometer, e.g. locations where a lot of people
congregate or near exhaust air openings or fire-
places.
CAUTION!
Before calibrating the fan anemometer, make sure
the battery warning symbol is not shown on the
display. Empty batteries can lead to the calibration
process being aborted.
Power off the fan anemometer.
To access the CO
2
calibration mode, simulta-
neously press and hold the On/Off key, the
HOLD/MIN/MAX key and the Down key for 2
seconds.
Fig. 18: Calibrating the CO
2
sensor
CAL is shown in the display and the fan anemom-
eter counts down 30 seconds. Then the calibra-
tion process begins.
During the calibration process a value ranging
between 380 and 420 ppm flashes in the top part
of the display.
The value stops flashing after approx. 10 minutes.
The 400 ppm calibration is finished and the fan
anemometer returns to the normal Measuring
mode.
NOTE!
To interrupt the calibration process at any time,
simply power off the fan anemometer.
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