Checking The Response Time (T90); Calibrate The Gas Detector; Carrying Out A Fresh Air Calibration - Dräger X-am 8000 Gebrauchsanweisung

6. Select to start the bump test.
 All measuring channels which are included in the
bump test flash, and all others are greyed out. When a
measuring channel successfully passes the test,
appears.
7. The bump test is complete when all measuring channels
included in the test successfully passed or failed the test.
8. Close the valves on the test gas cylinder.
● 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 calibration 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.
If measurement gas or calibration gas is changed, the
affected channel must be calibrated.
Instructions for use |
X-am
®
8000
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 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.
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
X-am 8000:
● An activated H added signal is automatically deactivated
2
duration of a bump test or a calibration.
● During fresh air calibration, the zero-point of all sensors
(except the DrägerSensors XXS O
CO , XXS O3) is set to 0.
2
● The DrägerSensors DUAL IR CO
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.
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):
|
Maintenance en
2
2
, DUAL IR CO and IR
2 2
, IR CO and XXS O3
2 2
).
2
47
.
,