Dräger X-am 3500 Mode D'emploi page 44

en Maintenance
5. The fresh air calibration is complete when all
measuring channels included in the calibration
successfully passed or failed the calibration.
● Select and then confirm the dialog to discard
the result.
● Select to confirm the result.
If there was an error during the fresh air calibration:
– Repeat the fresh air calibration.
– If necessary, replace the sensor.
5.5.2 Carrying out a single-gas calibration
Observe the following notices for the single-gas
calibration:
● For a single-gas calibration, you can choose either
the zero-point calibration and span calibration.
● With a zero-point calibration, the zero-point of the
selected sensor is set to zero.
● For the zero-point calibration of Dräger IR sensors, it
is assumed that the change in the zero-point leads
to a change of less than or equal to ±5 %LEL or
0.05 Vol% CO of the measured value at 50 %LEL
2
or 0.5 Vol% CO . If the deviation is greater than
2
±5 %LEL or 0.05 Vol% CO
invalid and an error or a warning is displayed
(configurable).
● For a span calibration of Dräger IR sensors, it is
assumed that a valid zero-point calibration exists (no
more than 30 min. old), otherwise an
acknowledgeable warning is displayed.
● For a span calibration, the sensitivity of the selected
sensor is set to the concentration value of the test
gas.
Use a standard test gas.
Allowed test gas concentration:
1)
DUAL IR CO
2
2 1)
IR CO
1)
DUAL IR Ex
1)
IR Ex
CatEx
O
2
CO
H S
2
1)
H HC
2
1)
PID HC
1)
PID LC ppb
, the span calibration is
2
2)
0.05 to 5 Vol%
The permissible test gas
concentrations were dis-
played by the gas detector
for the single-gas calibra-
tion of the sensitivity.
100 ppm iBut
5 ppm iBut
Test gas concentration of other gasses:
Refer to the Dräger CC-Vision PC software
1) X-am 8000 only
2) Depending on the measuring range and the measuring accu-
racy.
Dräger recommends selecting a test concentration in
the middle of the respective measuring range or close
to the expected measuring range.
To carry out a single-gas calibration:
1. Screw the calibration adapter onto the gas detector.
2. Connect the test gas cylinder to the calibration
adapter.
3. Connect a second hose (max. length: 2 m) to the
second connector on the calibration adapter to direct
the test gas to an exhaust or outside.
4. Switch on the gas detector.
5. Select > Log in.
6. Enter and confirm the password.
7. Select Maintenance > Single gas cal..
 A dialog for selecting the measuring channel to
be calibrated appears.
8. Select the measuring channel.
 A dialog for selecting the calibration appears.
9. Select either zero-point calibration or span
calibration.
● For a span calibration: Enter and confirm the
calibration concentration.
10.Open the valves on the test gas cylinder.
11. Select to start the single-gas calibration or
cancel the calibration.
 The measuring channel appears, and the
measured value flashes.
As soon as the stability check detects a stable
measured value, a calibration is carried out
automatically.
12.If necessary, press
control. In this case, a calibration happens
immediately.
 The new measured value is displayed for
confirmation.
The result is displayed as follows:
single-gas calibration successful.
single-gas calibration failed.
13.The single-gas calibration is complete when
measuring channel successfully passed or failed the
single-gas calibration.
to overrule the stability
®
X-am
to
3500