VESDA
®
LaserCOMPACT Product Manual
Version 1.0
11
3.7 Aspirator
The aspirator is a proprietary high efficiency suction air pump that draws in air through a network
of sampling air pipes and passes a small sample of the filtered air into the laser detection
chamber. The rest of the air is forced out through the exhaust pipe located at the bottom of the
enclosure. The aspirator runs continuously at a constantly regulated speed. The airflow through
the aspirator is monitored continuously by the airflow sensor located inside the air inlet port and
the user is prompted when there is a reduction or an increase in the airflow.
3.8 Air Exhaust Port
This port allows the sampled air to be expelled into the environment. There is one air exhaust
port and is located at the bottom right hand side of the enclosure. The size of the air exhaust
port is 25mm (1in)
∅
and is able to fit a pipe up to this size. A plug covers the air exhaust port
and must be removed during installation. The air from this port can be piped back to the fire
zone via pipes connected to this outlet if required. Any pipe connection made to the exhaust port
must NOT be glued.
3.9 Laser Detection Chamber
The Laser detection chamber is located in the rear of the enclosure behind the metal back
panel.
Note: This component is inaccessible, not serviceable and is not to be opened by any
personnel.
The metal back panel is not to be opened by any personnel.
In this chamber, a small portion of the smoky air passes through a laser beam causing light
scattering. The scattered light is analysed by the central processor card to determine the smoke
density or obscuration.
3.10 Processor Card
The central processor card is located in the rear of the enclosure behind the metal back panel.
Note: This component is inaccessible, not serviceable and is not to be opened by any
personnel.
The metal back panel is not to be opened by any personnel.
