The user is not authorized to calibrate the relative
humidity. If it becomes necessary to calibrate the
relative humidity, return the fan anemometer to
the factory or send it to an approved service cen-
ter.
The fan anemometer is calibrated ex-works to a
CO
2
concentration of 400 ppm. However, it should
be manually calibrated regularly outside in the fresh
air to guarantee accurate measurements.
Return the fan anemometer to the factory if it has
been used for a long time without being calibrated.
CAUTION!
Never calibrate the fan anemometer when the
CO
2
concentration is unknown. Otherwise, the fan
anemometer sets the calibrated value equal to
400 ppm which in turn will lead to incorrect meas-
urement results.
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