Carrying Out A Single-Gas Calibration - Dräger X-am 8000 Gebrauchsanweisung

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en Maintenance
If the fresh air calibration was released for user level 0 by
the Dräger CC-Vision PC software:
● Select > Maintenance > Fresh air cal..
If the fresh air calibration was not released for user level 0
by the Dräger CC-Vision PC software:
> Login
a.
b. Enter and confirm the password.
c. Select Maintenance > Fresh air cal..
3. Select to start the fresh air calibration.
 All measuring channels which are included in the fresh
air calibration flash, and all others are greyed out.
The result is displayed as follows for every measuring
channel:
fresh air calibration successful.
fresh air calibration failed.
4. If necessary, press
this case, a calibration happens immediately.
Dräger recommends using the automatic stability
control (wait until the gas detector has automatically
carried out the calibration).
 The new measured value is displayed for confirmation.
The result is displayed as follows:
fresh air calibration successful.
fresh air calibration failed.
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 or 0.5 Vol% CO
2
If the deviation is greater than ±5 %LEL or 0.05 Vol% CO
the span calibration is 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.
48
to overrule the stability control. In
When implementing an active over range with the CatEx
sensor (measurement gas: methane) note the additional
information in the technical manual.
Use a standard test gas.
Allowed test gas concentration:
1)
DUAL IR CO (ES)
2
1)
IR CO (ES)
2
1)
DUAL IR Ex (ES)
1)
(ES)
IR Ex
CatEx
O
2
H S
2
1)
H HC
2
Dual IR Ex/CO HC
2
1)
(CO channel)
2
1)
PID HC
1)
PID LC ppb
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 accuracy.
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 > Login.
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.
2
,
2
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 single-gas calibration or select
cancel 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.
2)
0.05 to 5 Vol%
The permissible test gas con-
centrations were displayed
by the gas detector for the
single-gas calibration of the
sensitivity.
20 to 80 vol. %
100 ppm iBut
5 ppm iBut
Instructions for use |
X-am
to
®
8000