Carrying Out A Fresh Air Calibration; Carrying Out A Single-Gas Calibration - Dräger X-am 3500 Gebrauchsanweisung

Calibration may not be possible due to instrument and
channel errors.

5.5.1 Carrying out a fresh air calibration

To improve accuracy, a fresh air calibration must be carried
out in the event of a zero deviation.
Observe the following notices for the calibration:
● For the fresh air calibration of Dräger IR sensors for
explosive hydrocarbon, it is assumed that the change in
the zero-point leads to a change of less than or equal to
±5 %LEL of the measured value at 50 %LEL. If the
deviation is greater than ±5 %LEL, the span calibration is
invalid.
● For the fresh air calibration, the display is set to 20.9 Vol%
for the XXS O .
2
Requirements:
– Fresh air calibration can only be carried out if at least once
sensor supports the fresh air calibration.
– The fresh air must be free of measurement or interfering
gasses.
– The gas detector is switched on and warm-up phases 1
and 2 are complete.
To carry out a fresh air calibration:
1. Switch on the gas detector.
2. Open the fresh air calibration (depending on the
configuration):
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:
a. > Login
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.
Instructions for use |
X-am
to overrule the stability control. In
®
3500
● 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.
Use a standard test gas.
Allowed test gas concentration:
2 1)
DUAL IR CO (ES)
2 1)
IR CO (ES)
1)
DUAL IR Ex (ES)
1)
IR Ex (ES)
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.
Maintenance
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
|
en
.
2
,
2
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