Wohler CD 210 Bedienungsanleitung Seite 24

Wöhler CD 210
Note: When the accuracy becomes a concern after a long time usage, return the
meter to the dealer for standard calibration.
Caution: Do not calibrate the meter in the air with unknown CO concentration.
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Otherwise, it will be calibrated as 400 ppm by default. This will lead to inaccurate
measurements.
The manual calibration is suggested to be done in fresh outdoor air that is well
ventilated and in sunny weather.
Place the meter in the calibration site. Turn on the meter and hold down CAL/ESC
and MODE simultaneously to enter CO calibration mode. 400 ppm and "CAL" are
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blinking on the LCD while performing calibration.
Fig.: 8.1: CO -Calibration
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Wait about 5 minutes until the blinking stops and the calibration is completed auto-
matically and then go back to the normal mode.
To abort the calibration, turn off the meter at any time.
Note: Ensure that the batteries are with full voltage during the calibration to prevent
from interruption or failed calibration and that the device is not exposed to direct
sun.
8.2. Calibration on the relative humidity
The meter defaults to be calibrated the humidity with 33 % and 75 % salt solution.
The ambient condition is recommended to be at 25 °C and stable humidity (better to
be close to the calibration value). To abort calibration, just turn off the meter.
Caution: Do not calibrate the humidity without the default calibration salt. (see
accessories). Otherwise, it will cause permanent damage.
8.3. 33%-Calibration
Plug the sensor probe into 33% salt bottle. Hold down CAL/ESC and DP/WBT un-
der normal mode to enter the 33% calibration. "CAL" and the calibrating value
(32,7% if at 25°C) are blinking on the display with the current temperature at the
left. The meter is now calibrating and will finish in about 60 minutes, when "CAL"
and the value of the relative humidity stop blinking.
8.4. 75%-calibration
After the 33 % calibration, plug the sensor probe into the 75 % salt bottle. Then
press M/AV to enter the 75 % calibration mode.
„CAL" and the calibrating value (75,2 % if at 25 °C) are blinking on the display with
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