Operating the Fido X4
From this point on, verification proceeds in the same way as it does in Particulate Detection
Mode. For more information, see 5.2 , p.31.
5.4.5 Collecting a vapor sample
When system verification in Vapor Mode is complete, a screen like Figure 5-25 will appear.
Select
Sample
or
Search
for the detection method you want. The two methods are
described below.
Note:
Depending on the Vapor Mode settings, both Sample and Search methods may
not be available. See 5.4.2.
Figure 5-25
: Selecting a vapor detection method
5.4.5.1 Sample
The Sample method allows you to collect a controlled, targeted sample, such as from the
headspace over a cup of liquid. When you select Sample, the system will display a count-
down from 3, prompting you to present the sample. In the example of the cup, you would
present the sample by positioning the detector inlet in or near the headspace. The sample
presentation time will last for a maximum of 10 seconds or until on-screen prompts direct
you to remove the sample.
Alarm results in Vapor Detection Mode resemble those for Particle Mode. For more inform-
ation, see Step 6 of Section 5.3.3, "How to sample" and Section 5.5, "Sample Information."
Note:
Due to chemical and environmental principles, it is less likely in Vapor Mode to be
able to identify a threat at a category or specific substance level. The detection
algorithm implemented for the vapor sample method focuses on general threat
detection and false alarm reduction.
5.4.5.2 Search
Search allows you to monitor system response graphically, in real time, through the display.
When you select
Sample
, a graph which represents the response of each channel in the
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