Factair F4504 Operating Manual page 21

Once the purge has completed the chemical
reagent tubes / Impactor should be inserted into
the corresponding test port and tightened firmly.
The tubes/Impactors to be used are shown at the
top of the screen and will be dependent on the
test standard selected earlier.
If using an Impactor ensure it has an intact
protective seal. This seal must remain in place for
the duration of the test.
Press the button in top right hand corner to start
the test.
The test will now commence and the duration will
be displayed as a countdown, together with test
standard. The pressure, ambient temperature,
and oxygen content will also be displayed.
During the test the flowmeter should be kept
closed.
Test port volumes are automatically adjusted for
different gas mediums. The unit can be left until
the test time has elapsed.
Depending on the standard and therefore the
chemical reagent tubes / Impactor being used
some will complete at different test times and
the instrument will automatically stop the flow to
these tubes. Each complete test port will be
shown with a green tick.
If the instrument detects that the dewpoint
meter's rate of change is still too high (>0.2 dec C
per minute) it will automatically continue the test
until this stabilises (maximum test time 15
minutes).
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