VESDA VLS (LaserSCANNER) Aspirating Smoke Detector

Key Features
Individual pipe identification
Adaptive Scan Threshold
Wide sensitivity range
Laser-based smoke detection
VESDAnet™ communication
High-efficiency aspirator


The VESDA VLS detector is a similar detector to the standard VESDA VLP, however, it also includes a valve mechanism in the inlet manifold and software to control the airflow from the four pipes.

How it Works

The VLS detector draws air from all sectors in use and if the smoke level reaches the Adaptive Scan Threshold, the detector quickly scans each pipe to identify which pipe is carrying smoke. However, if more than one pipe is transporting smoke, the sector with the highest smoke concentration is designated as the First Alarm Sector (FAS).

Once Fast Scan is completed and the FAS has been identified, the VLS will continue to closely monitor all four pipes to monitor fire growth and maintain full protection of the area. There are four alarm levels:

  • Alert
  • Action
  • Fire 1
  • Fire 2

The sensitivity of each alarm level can be set to ensure the optimum alarm thresholds are applied for each sector.

The VLS Display

The VLS display includes a bar graph which indicates the overall fault indication, smoke level and alarm threshold. This bar graph displays the individual sector smoke levels during the scanning sequence. As well as this, there is an extra LED to showcase that a First Alarm Sector (FAS) has been identified, and an extra function to the ‘Silence Button’ to allow for Manual Scan to be carried out.

Relay Options

The VLS detector can be fitted with a programmable 7 or 12 relay Termination Card these relays can be mounted in a 19in subrack or in a remote box.


VESDAnet is used to transmit the status of the detector, and all alarm, service and fault events, to displays and external systems. The VESDAnet loop offers a robust bi-directional communication network between devices, even allowing continued operation during single point wiring failures. VESDAnet also provides system programming from a single location and forms the basis of the modular nature of the VESDA system.

Referencing and AutoLearn™

The VLS has both the Referencing and AutoLearn™ software functions to ensure optimum operation in different environments and to eliminate the occurrence of nuisance alarms.

Referencing makes sure external pollution to a protected environment does not interfere with the true smoke level being detected and AutoLearn monitors the ambient environment while setting the most appropriate alarm thresholds (Alert, Action, Fire 1, Fire 2) during the commissioning process.

Other Features

  • 4 alarm levels per sector
  • Clean air barrier optics protection
  • Easy to replace air filter
  • 7 or 12 programmable relays option
  • AutoLearn™
  • Referencing
  • Event log
  • Recessed mounting


CE - EMC and CPD
EN 54-20
  • Class A (40 holes / 0.08% obs/m)
  • Class B (40 holes / 0.23% obs/m)
  • Class C (60 holes / 0.65% obs/m)

Tech Specs

Input Power

Supply Voltage: 18–30 VDC
Power Consumption @ 24 VDC: No Display or Programmer
  Aspirator @ 3000 rpm Aspirator @ 4200 rpm
  Quiescent With Alarm Quiescent With Alarm
Power 5.8 W 6.24 W 6.72 W 7.2 W
Current 240 mA 260 mA 280 mA 300 mA


Dimensions (WHD): 350 mm x 225 mm x 125 mm (13.8 in x 8.9 in x 4.9 in)
Weight: 4.0 kg (9 lbs) including Display and Programmer modules
Programmable Relays: 7 or 12 Relays option
Default: NO/NC contacts Alert, Action, Fire 1, Fire 2, Maintenance, Urgent Fault & Isolate first Alarm Sector 1 to 4 and Scan
IP Rating: IP30
Cable Access: 8 x 25 mm (1 in) knockouts in various positions
Cable Termination: Screw terminals 0.2–2.5 sq mm (30–12 AWG)
Sensitivity Range: 0.005%–20% obs/m (0.0015%–6% obs/ft)

Operating Conditions

Tested to: -10°C to 55°C (14°F to 131°F)
Detector Ambient: 0°C to 39°C (32° to 103°F) (Recommended)
Sampled Air: -20° to 60°C (-4° to 140°F)
Humidity: 10% to 95% RH, non-condensing
Please consult your Xtralis office for operation outside these parameters or where sampled air is continually above 0.05% obs/m (0.015% obs/ft) under normal operating conditions.

Storage Conditions (non-operational)

Battery life: Up to 2 years
Humidity: Dry (<95%)
Temperature: 0° to 85° C (32° to 185°F)
Must not be exposed to sunlight or other radiation sources

Sampling Network

Maximum length per pipe: 100m (328 ft)
Aggregate pipe length: 200 m (650 ft)
Minimum flow per pipe: 15 litres/min.
Pipe Modelling Design Tool: ASPIRE2TM
These pipe lengths represent best practice for systems with single pipe runs on each port (no branching). For longer and / or more complex pipe arrangements, predictions of EN 54-20 compliance are determined using ASPIRE2.

Pipe Size

External Diameter: (1 in)
Internal Diameter 15–21 mm: (9 /16 in–7 /8 in)

Alarm Threshold Setting Range

Alert: 0.005%–1.990% obs/m (0.0015%–0.6218% obs/ft)
Action: 0.010%–1.995% obs/m (0.0031%–0.6234% obs/ft)
Fire 1: 0.015%–2.00% obs/m (0.0046%–0.625% obs/ft)
Fire 2: 0.020%–20.00% obs/m (0.0062%–6.25% obs/ft)*

*Limited to 12% obs/m (4% obs/ft) in UL mode

Software Features

Event Log: Up to 18,000 events stored on FIFO basis.
AutoLearn: Minimum 15 minutes, maximum 15 days.

Recommended minimum period 1 day. During AutoLearn thresholds are NOT changed from pre-set values.

Referencing: Compensation for external ambient conditions.
Four Alarm Levels (per sector pipe): Alert, Action, Fire 1 & Fire 2.
Two Fault Warning Levels: Maintenance and Major fault.

Software Programmable Relays: 7 or 12. Maintenance Aids: Filter & Flow monitoring. Event reporting via VESDAnet or Event Log. Adaptive Scan Threshold: Detector selects the appropriate scan threshold automatically.

Part Codes

Remote Programmer VRT-100
Recessed Mounting Kit (Optional) VSP-011
Hand-held Programmer VHH-100
19 in Sub Rack Configuration contact Eurofyre
FD7 Scanner + Display VLS-204
FD7 Scanner + Programmer + Display VLS-214
FD7 Scanner with FOK LEDs VLS-600
FD12 Scanner + Display VLS-304
FD12 Scanner + Programmer + Display VLS-314
FD12 Scanner with FOK LEDs VLS-700

Contact Us