Chapter 2: Installation and configuration
24 LaserSense Nano Aspirating Smoke Detector Installers Handbook
Alarm factor
The detector calculates sensitivity relative to the ambient pollution level. Higher
Alarm Factors provide reduced sensitivity (the alarm threshold is maintained
further away from the ambient level). Refer to the Remote Control Software
manual for further details.
Note: Changing the Alarm Factor starts a new FastLearn cycle: during the initial
15 minute learning period, the detector is incapable of reporting an alarm, and
will take 24 hours to achieve optimum performance, based on the ambient
conditions.
ClassiFire
Selecting ClassiFire On allows the artificial intelligence system to continuously
adjust alarm thresholds in order to avoid unwanted alarms from environmental
changes (recommended).
Note: Disabling this feature means that nuisance alarms due to fluctuations in
ambient pollution levels become more likely.
Fixed alarms
Switches the artificial intelligence system off, locking sensitivity to that set at
initial setup. This deactivates the dust filter monitoring system (not
recommended).
Note: Enabling this feature means that nuisance alarms due to fluctuations in
ambient pollution levels become more likely.
Flow limit offset
Flow limit offset sets the sensitivity of the airflow monitoring system. A small
offset makes the system very sensitive to air flow changes. EN 54 systems must
react to ±20% changes in airflow, which equates to a change in flow sensor
reading of +5. Areas with fluctuating air pressures may require a less sensitive
setting.
Note: Changing the flow limit offset starts a new flow calibration set up.
Flow delay
Sets the time for which a flow fault must continue before a fault is signaled.
Input select
The detector input terminal may be used to either monitor an associated power
supply for faults, or for ClassiFire override (reduces normal sensitivity by 50%).
Note: In the factory default condition, the switch is set to OFF (power supply
monitoring). This gives a fault condition if there is an open circuit on the INPUT
terminals. Fit a wire link if you do not require power supply monitoring.
Caution: If you fit a wire link across the INPUT terminals, you must set this
switch OFF, or else the detector sensitivity is dramatically and permanently
reduced by the ClassiFire override function.
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