Dräger X-am 8000 Mode D'emploi page 55

● Select and then confirm the dialog to discard
the result.
● Select to confirm the result.
9. Remove the calibration adapter.
If there was an error during the bump test:
1. An error is displayed for the measuring channel.
2. Repeat the bump test.
3. If necessary, replace the sensor.
5.4.2 Checking the response time (t90)
1. Carry out a bump test and perform a simple check of
the response time.
a. Connect the test gas to the calibration adapter
and open the valves on the test gas cylinder so
that the calibration adapter is flushed with test
gas.
b. Fit the calibration adapter on the gas detector
and note the starting point.
c. Determine the time until 90 % of the test gas
concentration is reached.
2. Compare the measured response time with the
previous bump tests and the t90 values that are
indicated in the enclosed supplementary
documentation (part no. 9033655).
The determined T90 adjustment time may differ from
the certified adjustment time as this simplified method
does not comply with the standard.
5.5 Calibrate the gas detector
WARNING
Incorrect measured values!
An incorrect calibration may prevent alarms from
triggering, or alarms may trigger late.
► Do not close the outlet of the calibration adapter /
exhaust gas hose.
► Always carry out the fresh air / zero adjustment
before the span calibration.
NOTICE
Damage to the sensors!
When using the exhaust gas hose, the sensors may be
damaged in the case of direct suction on the exhaust
gas hose.
► If necessary, lead the exhaust gas hose (max. length
2 m) to an exhaust of outside.
X-am
®
8000
If measurement gas or calibration gas is changed,
the affected channel must be calibrated.
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 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.
Adjustment 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
X-am 8000:
● An activated H added signal is automatically
2
deactivated duration of a bump test or a calibration.
● During fresh air calibration, the zero-point of all
sensors (except the DrägerSensors XXS O
IR CO and IR CO , XXS O3) is set to 0.
2 2
● The DrägerSensors DUAL IR CO
O3 must be calibrated with a suitable gas which is
free of carbon dioxide / ozone (e.g. N
● The DrägerSensor PID LC ppb can be calibrated
with the zero gasses nitrogen or synthetic air.
Maintenance
, the span calibration is
2
.
2
, DUAL
2
, IR CO and XXS
2 2
).
2
en