Comelit ILS-2, Manual

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4.4 End caps
Figure 4-2: End cap with central hole
The sampling pipes terminate with a cap which has a hole at the centre. The end cap hole should be considered
as the final sampling hole.
4.5 Sampling holes
The sampling holes are distributed along the piping and are usually drilled once the pipes have been installed,
using a drill bit with a suitable diameter. Drilling can be carried out prior to installation, taking care to space the
holes correctly in the area you wish to protect. Drilling should also be performed in such a way that residual ABS
is not left around the hole. After drilling, remove any ABS residue that has collected inside the pipe. This can be
done by sucking the air out with an external extractor, or by blowing compressed air through, which will push the
debris through to the end of the pipe; in the latter case you will need to fit the end cap afterwards. In standard
applications, the sampling hole faces “downwards”.
4.6 Air outlet
The extracted air, after being analysed, exits via the relevant hole on the enclosure. In some applications, the air
outlet must be moved so that it is a certain distance from the detector; this requires an outlet pipe. This is
necessary when, for example, you wish to reduce the noise level, reduce the risk of outlet obstruction, or the static
pressure of the room in which the air is released must be the same as the room from which the air is extracted,
etc.
The maximum permitted length for this outlet pipe is 10 m, in order to minimise airflow reduction.
The air outlet must be positioned with care, to ensure it is not obstructed accidentally.
4.7 Filters
Figure 4-3: Filters at the inlet of the ILS-2 detector
The sampled air is passed through a filter (code: 02-FL53) before it enters the optical detection
chamber.