LaserSense 100 Aspirating Smoke Detector Installers Handbook v
EN 54-20 and UL installation
The pipe installation must be designed and verified for compliance with EN 54-20
using PipeCAD software. For more information on PipeCAD, see your PipeCAD
documentation.
EN 54-20 installation
For EN 54-20 compliance the transport time of the last sampling hole shall be
checked following all installation and proven to be less than or equal to that
determined by PipeCAD.
For the installation to comply with EN 54-20 Classes A, B, and C, each sampling
hole must be no less sensitive than 0.62% obs/m.
The calculation can be further refined by leaving a working detector in the
protected area for at least 24 hours at the intended alarm factor for the
installation (this could be done before or after installation). The detector
sensitivity can be read from the Sensitivity figure on the histogram screen of the
Remote software supplied with each detector.
The PipeCAD software will determine the classification of any used configuration.
Commissioning and periodic system tests must involve smoke tests to verify that
the system performs as expected and enters Alarm within the time determined by
PipeCAD from the farthest hole. The detector sensitivity must also be inspected
to ensure it has not radically fallen from the installed figure. If it has changed for
any reason, the new figure must be re-entered into PipeCAD and the
recalculated hole sensitivities must be confirmed to be within the class limits
shown above. The settings of a compliant system should be recorded, as it is
possible by changing certain programmable functions to make the system
noncompliant. If functions are changed, it is recommended that the system is
retested if continuing compliance is in any doubt.
UL installation
Note: UL certified products may also contain additional approvals, e.g. FM3230.
Please refer to the product labels.
UL 268 fire tests were passed with an installation as follows:
Total sampling pipe length: 160 ft. (single pipe)
Number of sampling holes: 10
Worst-case sampling hole sensitivity as indicated by PipeCAD:
1.28% obs/ft.*
Alarm factor: 1
Alarm delay: 0 seconds
These settings gave satisfactory responses to the test fires in 120 seconds or
better. For the purposes of UL 268 compliance, these should be regarded as
worst case values. Layouts should be planned in PipeCAD and the indicated
worst-case hole sensitivity should be better than 1.28% obs/ft.*. Commissioning
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