VESDA VLS Aspirating Smoke Detector


Key Features

  • Individual pipe identification
  • Adaptive Scan Threshold
  • Wide sensitivity range
  • Laser-based smoke detection
  • High-efficiency aspirator


This product has been discontinued and has been replaced by the VESDA-E VES Aspirating Smoke Detector. Please contact Eurofyre for further information, spare parts, servicing and training.

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


The VESDA VLS is fully approved by VdS for safe use and installation in any European Union country and bears the CE mark to show that it complies with all the applicable Directives including the CPR, EMC and the Low Voltage Directive (LVD).

EN54-20:2006 + AC:2008 – Fire detection and fire alarm systems – Control and indicating equipment.

Tech Specs

Supply Voltage18–30Vdc
Power Consumption @ 24VdcNo Display or Programmer

Aspirator @ 3000rpm
Power: Quiescent – 5.8W, With alarm – 6.24W
Current: Quiescent – 240mA With alarm – 260mA

Aspirator @ 4200rpm
Power: Quiescent – 6.72W, With alarm – 7.20W
Current: Quiescent – 280mA With alarm – 300mA
Dimensions (W x H x D)350mm x 225mm x 125mm (13.8in x 8.9in x 4.9in)
Weight4.0kg (9 lbs) including Display and Programmer modules
IP RatingIP30
Operating ConditionsTested to: -10°C to 55°C (14°F to 131°F) Product UL listed for use from 0°C to 38°C (32°F to 104°F).
Detector Ambient: 0°C to 39°C (32° to 103°F)* (Recommended)
Sampled Air: -20° to 60°C (-4° to 140°F) Product UL listed for use from 0°C to 38°C (32°F to 104°F).
Humidity: 10%–95% RH, non-condensing

Please consult Eurofyre 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
Must not exposed to sunlight or other radiation sources
Sampling HolesEN 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)
Sampling NetworkAggregate pipe length: 200m (650ft)
Maximum Single Length: 100m (328ft)
Minimum flow per pipe: 15 liters/min.
Pipe Modelling Design Tool: ASPIRE2™

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.
Area CoverageTypically up to 2000m2 (21500 sq. ft.), depending on local codes and standards
Pipe SizeExternal Diameter 25mm (1 in)
Internal Diameter 15–21mm (9/16 in–7/8 in)
Programmable Relays7 or 12 Relays option
Contacts rated 2A @ 30 VDC
Default: 7 Relays: NO/NC contacts Alert, Action, Fire 1, Fire 2,
Maintenance, Urgent Fault & Isolate
Default: 12 Relays: 10 x NO, 2 x NO/NC contacts Alert, Action,
Fire 1, Fire 2, Maintenance, Urgent Fault & Isolate, First Alarm
Sector 1 to 4 and Scan
Cable Access8 x 25mm (1in) knockouts in various positions
Cable TerminationScrew terminals 0.2–2.5 sq mm (30–12 AWG)
Alarm Sensitivity Range0.005%–20% obs/m (0.0015%–6.25% obs/ft)
Alarm Threshold Setting RangeAlert: 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
Event LogUp to 18,000 events stored on FIFO basis
Software FeaturesEvent 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.



Eurofyre is an authorised distributor of Honeywell and has been a major technical wholesaler of Xtralis products since 2007. We offer expert advice and supply all aspects of VESDA, FAAST and ICAM aspirating smoke detection systems including pipework calculations, demonstration/training and excellent after-sale support.

Contact us to receive competitive trade discounts or apply online for a credit account.

This product has been discontinued and has been replaced by the VESDA-E VES Aspirating Smoke Detector. Please contact Eurofyre for further information, spare parts, servicing and training.