36
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 ga-
ses.
— All the sensors are included in the fresh
air calibration. 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 fault mes-
sage).
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 the sensors (with the excepti-
on of the DrägerSensor XXS O
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 device.
Depending on device configuration:
● Call the quick menu and select the "fresh
air calibration" function, page 15.
or
● Call the calibration menu and select the
"fresh air calibration" function, page 16.
— The current gas concentration values
flash.
When the measured values are stable:
● Press the key to perform the fresh air
calibration.
03123854_01_en.eps
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