Calibration - Wohler CD 210 Bedienungsanleitung

Wöhler CD 210

8. Calibration

8.1. CO -Calibration
2
The meter is calibrated at standard 400 ppm CO concentration in factory.
2
It is suggested to do manual calibration every 12 months to maintain good
accuracy.
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 concen-
2
tration. 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
2
ppm and "CAL" are blinking on the LCD while performing calibration.
Fig.: 8.1: CO -Calibration
2
Wait about 5 minutes until the blinking stops and the calibration is com-
pleted automatically 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.
Hotline: +49 2953 73-211 Fax: +49 2953 73-250
30