Carrying Out Measuring With The Pump - Dräger HFG 000 Series Technical Manual

Operation
The wizards are only available for X-am 8000.
For the DrägerSensors XXS CI2, COCI2, O3 as well as amine and odorants, there
are no wizards for confined spaces and leak searching, as these materials can not
be pumped (properly) through tubes. In addition to the materials listed above, there
may also be other materials for which there are no flushing times available in the
gas detector. There is no confined space entry wizard for these materials.
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 is required.
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.
4.10.2

Carrying out measuring 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.
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Technical manual X-am® 3500/8000