Dräger X-am 2500 Gebrauchsanweisung Seite 28

Operation
4. Open the test gas cylinder valve to let test gas flow over the sensors.
5. Wait until the instrument displays the test gas concentration with
sufficient tolerance –
Ex: ±20 % of the test gas concentration
1
O : ±0.6 vol. %
2
TOX: ±20 %. of the test gas concentration
If the alarm thresholds are exceeded, the instrument displays the
gas concentration in alternation with A1 or A2 depending on the
test gas concentration.
6. Close the test gas cylinder valve and remove the instrument from
the calibration cradle.
NOTICE
i i
To check the measured value response times, apply t90 test
gas to the X-am via the calibration cradle. Check the results
in accordance with the information in the table in the enclosed
supplementary documentation (order no. 90 33 890) until
90 % of the end display is reached.
NOTICE
i
i
After the bump test (menu), the display shows a printer icon
even if there is no printer connected to the bump test station.
If the displays are outside of the above-mentioned ranges:
Have the instrument adjusted by the service personnel.

1) During application of the Dräger mixed gas (order no. 68 11 130) the displays should be
within this range.
28
4.9.4
Calibration may not be possible due to instrument and channel errors.
1
1
Carrying out the fresh air calibration
Calibrate the instrument to fresh air, free of measured gases or other
interfering gases. During the fresh air calibration the zero point of all
sensors (with the exception of the DrägerSensor XXSO
In the case of the DrägerSensor XXS O
1. Switch on instrument.
2. Press the [+] key 3 times, the symbol for fresh air calibration
3. Press the OK key to start the fresh air calibration function.
If a fault has occurred during the fresh air calibration:
Calibration
NOTICE
i
i
Dräger recommends using the extended bump test for cross
calibrations (Dräger X-dock technical manual).
appears.
The measured values flash.

When the measured values have stabilized:
a. Press the [OK] key to perform the calibration.
The display containing the current gas concentration changes
with the display OK.
b. Press the OK key to exit the calibration function or wait for
approx. 5 seconds.
a. The fault message appears and
respective sensor instead of the measured value.
b. In this case, repeat the fresh air calibration.
If necessary, have the sensor replaced by qualified personnel.
) are set to 0.
2
, the display is set to 20.9 vol. %.
2
is displayed for the
Dräger X-am 2500