6
Permanently inhaling bad and stale air can cause
tiredness, headaches, eye irritation, etc. The ability
to perform and concentrate decreases noticeably
as aresult.
7. Functions of the +and Mbuttons
•Press the +button (B) to check the max /min
measured values. Holding the +button (B) for
longer permanently deletes all of the measurements
made so far.
•Pressing the Mbutton allows the temperature
display to be toggled between Celsius and
Fahrenheit.
8. Calibration instructions:
•Move the CO
2
measuring device outdoors to
calibrate it.
•Ensurethat the environment does not have an
excessively high CO
2
content, e.g. due to exhaust
gases, kitchen vapours, road trac, etc.
•Switch the device on and wait afew minutes until
aCO
2
value is displayed. Be awarethat the battery
must be fully charged for this, or the device must be
connected to the mains power supply.
•Then press the „+“ (B) and „Power“ (A) buttons
simultaneously.
•The device then displays „CAL“and ashes. Do not
press any buttons during this process.
•After around 20 minutes, the device stops ashing
and calibration is complete.
•The CO
2
value measured during calibration is stored
as areference value and the device displays 400
ppm. This baseline calibration forms the basis for
informative further measurements.
Note -reference value
•If the device has been calibrated in an
environment with 800 ppm CO
2
,for example, this
value will be stored as the reference value. 400
ppm will be displayed, however.
•The ppm display only increases if the real air
value exceeds 800 ppm.
•With arealair value of e.g. 873 ppm, the device
would display 473 ppm. If the value is below
800 ppm, the display will remain at 400 ppm. If
the device displays 400 ppm frequently,this is
probably because it is not suciently calibrated.
Checking the measuring function
Blow once forcefully into the back of the device. The
CO
2
indicator should rise signicantly for several
minutes and display values up to 5000 ppm.
Avoid perfume, paint, air freshener,cigarette smoke,
alcohol, chemical substances, etc. near the device when
carrying out measurements in order to prevent incorrect
measuring values.
9. Care and maintenance
Note
Disconnect the device from the mains before
cleaning and during prolonged periods of non-use.
•Only clean this product with aslightly damp, lint-free
cloth and do not use aggressive cleaning agents.
•Ensurethat no water is able to enter the product.
