5. Functions
5-3. Automatic adjustment function
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5-3. Automatic adjustment function
The product features an automatic adjustment function that corrects sensor output fluctuations over time.
This records the lowest carbon dioxide concentration measured during the 24-hour period since the product was
turned on. It corrects this to correspond to a 420 ppm carbon dioxide concentration in the outdoor atmosphere. If the
power is subsequently left on, the lowest carbon dioxide concentration measured during the next seven-day period is
recorded. This value is corrected to correspond to a 420 ppm carbon dioxide concentration in the outdoor
atmosphere.
CAUTION
The outdoor atmospheric carbon dioxide concentration may vary from region to region but is normally within
the range from 400 ppm to 450 ppm.
The product must be installed in a location where the carbon dioxide concentration of the indoor air falls to
approximately the same 420 ppm as the outdoor air at night, such as at weekends. If the lowest carbon dioxide
concentration is not 420 ppm during this period, this difference will be regarded as the margin of error.
The automatic adjustment function will not operate reliably if the power is turned on and off frequently.
To correct sensor output fluctuations over time, turn off the power, then turn the power back on to activate the
automatic adjustment function 24 hours later.
If the product reading does not vary from 400 ppm in a room where several people are present or if the reading
remains high (for example, over 1,000 ppm) where few people are present, the adjustment may not have
occurred. Turn off the power, then turn the power back on again to activate the automatic adjustment function
24 hours later.
