46
Maintenance
Carrying out the fresh air calibration
To improve the zero point accuracy, you can carry out a fresh air calibration.
Calibrate the device to fresh air, free of measured gases or other interfering gases.
Not all sensors are included in the fresh air calibration
1)
. Sensors which have not
warmed up or which are faulty prevent a calibration.
In the case of sensors which are in the warm-up phase, the message » 159 « is
displayed with the special symbol » « (for warning message).
In the case of a sensor or device error, the message » 109 « is displayed with the
special symbol » « (for a fault message).
The message is cleared after 5 seconds and the function is available again in the
menu
During the fresh air calibration, the zero point of all sensors (with the exception of
DrägerSensor XXS O
2
) is set to 0.
In the case of DrägerSensor XXS O
2
, the display is set to 20.9 vol. %.
Switch on the device.
Depending on device configuration:
Call the quick menu and select the
Fresh Air Calibration function,
page 18.
or
Call the calibration menu and select
the Fresh Air Calibration function,
page 20.
The current gas concentration values
flash.
When the measured values have sta-
bilized:
Press the key to perform the fresh
air calibration.
NOTICE
If none of the sensors fitted permits calibration with fresh air (e.g. only O
3
, only IR-
CO
2
), fresh air calibration is not offered as a menu function.
1) Fresh air calibration / zero point calibration is not supported by the DrägerSensor XXS O
3
. A zero point
calibration / adjustment of these sensors can be conducted using the Dräger CC-Vision PC software.
To do so, a suitable zero gas that is free of ozone (e.g. N
2
) should be used.
03123999_01_en.eps
ch
4
%LEL
O
2
Vol%
CO
ppm
H
2
S
ppm
NH
3
ppm
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