Riken Keiki CO2RK-Lite, Руководство по эксплуатации

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4. Usage Instructions 4-2. Checking the carbon dioxide concentration (LCD display)
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4-2. Checking the carbon dioxide concentration (LCD display)
The measurement screen displays the carbon dioxide concentration
on the LCD.
The product is capable of monitoring carbon dioxide at concentrations
from 400 ppm to 5,000 ppm.
If the concentration is below 400 ppm, the display will remain fixed at
400 ppm. Likewise, if the concentration exceeds 5,000 ppm, the
display will remain fixed at 5,000 ppm.
CAUTION

Atmospheric carbon dioxide concentrations outdoors may vary from region to region. Readings will constantly
fluctuate within the range from 400 ppm to 450 ppm. A constant carbon dioxide concentration reading may
indicate a product malfunction.

To confirm that the product is operating correctly, expose to outdoor air out of direct sunlight, wind and rain,
dust, or human exhaled breath. The product can be assumed to be operating correctly if the carbon dioxide
concentration is within the range from 400 ppm to 450 ppm after five to ten minutes.