Dräger X-am 8000 Mode D'emploi page 48

en Operation
– Following a bump test with aggressive gases (such
as biogas or chlorine), flush the pump with clean air
for several minutes to extend the service life of the
pump.
– A test of the response time with target gas is
recommended.
The wizards are only available for X-am 8000.
For DrägerSensor XXS Cl2, COCl2, O3 as well as
amine and odorants, there is no wizard for clearance
measurement, as these gases cannot be pumped
(properly) through tubes. In addition to the gases listed
above, there may also be other gases for which there
are no flushing times available in the gas detector.
There is no confined space entry wizard for these
gases.
Flush the Dräger sampling hose or Dräger probes prior
to each measurement with the gas to be measured.
The flushing phase is necessary to reduce negative
effects associated with the use of a sampling hose or a
probe, e.g. gas transport time, memory effects, dead
volume. The duration of the flushing phase depends on
factors such as type and concentration of the gas or
vapour to be measured as well as material, length,
diameter and age of the sampling hose or probe. In
addition to the flushing time, the sensor response time
must be observed (refer to the instructions for use for
the DrägerSensors used).
Generally, when using a sampling hose (3 mm internal
diameter, new, dry, clean) with standard gasses, a
typical flushing time of approx. 3 s/m can be assumed.
Example:
The flushing time for oxygen with a 10 m hose is
approx. 30 seconds. The assumed sensor response
time is approx. 10 seconds in addition. Thus, the overall
time before reading the gas detector is approx.
40 seconds.
A flow-rate alarm is delayed by 10 to 30 seconds
depending on the length of the hose.
X-am 8000: For benzene/pre-tube measurements, the
maximum hose length is 10 m.
4.11.2 Carrying out monitoring with the
pump
Requirements:
– The gas detector is equipped with a pump and is
switched on.
– All installed sensors are warmed up.
– The gas detector is ready to take measurements.
– The thread port for the pump adapter and calibration
adapter must be clean.
1. Connect the hose (3 mm internal diameter) with the
dust and water filter to the inlet spout (see figure M
on page 3) of the pump adapter.
2. Mount the pump adapter to the gas detector. Make
sure that both guide pins are in the correct grooves.
Check that the pump adapter is mounted
correctly. If the pump adapter is mounted correctly,
the leak test starts automatically. If the leak test
does not start, the gas detector is not ready for use.
Avoid bending the pump adapter.
The gas detector automatically switches to pump
mode as soon as the pump adapter is mounted.
 The leak test starts automatically.
Dräger recommends performing the leak test
directly before use with the connected probe (hose
probe, rod probe) so that leaks can be detected in
the entire intake system.
3. When the leak test is displayed, the suction inlet on
the probe or hose closes within 60 s and remains
closed until the leak test is complete.
4. Open the suction inlet.
– Leak test successful: Monitoring starts. Observe
the purging times!
– Leak test failed: Inspect the probe, hose and
adapter and repeat the leak test.
5. Place the probe or the end of the hose on the
sampling location.
!
®
X-am 8000