48
Carrying out the fresh air calibration/zero-point calibration
To improve the zero point accuracy, you can carry out a fresh air calibration/zero-point
calibration.
— Calibrate the instrument to fresh air calibration/zero-point calibration, free of
measured gases or other interfering gases.
— All sensors are included in the fresh air calibration/zero-point calibration.
1)
Sensors which have not warmed up or which are faulty prevent a calibration/
adjustment.
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 instrument error, the message » 109 « is displayed with
the special symbol » « (for a fault message).
The message is cleared after 5 sec. and the function is available again in the menu.
— During the fresh air calibration /zero-point calibration, the zero point of all sensors (with
the exception of the DrägerSensors XXSO
2
, DUAL IR CO
2
and IR CO
2
) is set to 0.
In the case of the DrägerSensor XXS O
2
, the display is set to 20.9 vol.-%.
Switch on the instrument.
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 DUAL IR CO
2
,
the DrägerSensor IR CO
2
or the DrägerSensor XXS O
3
. A zero-point calibration / adjustment of
these sensors can be conducted using the Dräger CC Vision software. To do so, a suitable zero
gas that is free of carbondioxide and ozone (e.g. N
2
) should be used.
Depending on instrument configuration:
Call the quick menu and select the
Fresh Air Calibration/zero-point
calibration function, page 16.
or
Call the calibration menu and select
the Fresh Air Calibration /zero-point
calibration function, page 18.
— The current gas concentration values
flash.
When the measured values have
stabilized:
Press the key to perform the fresh
air calibration/zero-point calibration.
03133072_01_en.eps
O2
Vol%
ch4
%LEL
CO
ppm
H
2S
ppm
NH
3
ppm
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