Xtralis VESDA VLP (LaserPlus) Aspirating Smoke Detectors

Key Features
Wide sensitivity range
Laser-based smoke detection
High-efficiency aspirator
Airflow supervisor per sampling pipe
7 programmable relays


The Xtralis VESDA VLP Aspirating Smoke Detectors is classed as a “Very Early Warning Smoke Detector”. This means that it can accurately measure very low to extremely high concentrations of smoke and can reliably detect fire at the earliest stage possible.

The VESDA VLP Aspirating Smoke Detector is the central element of the VESDA ASD product range and uses unique detection properties to provide an alarm sensitivity range of 0.0005% to 20% obscuration/m (0.0015%–6.25% obscuration/ft).

How it Works

A high-efficiency aspirator is used to draw air into the VLP via a network of sampling pipes. Each pipe has its own sensor that monitors for changes in airflow to ensure optimum performance, a sample of air is sent to the detection chamber and the rest is exhausted back into the protected zone. The air passed into the sampling chamber is filtered by ultra-fine filters to protect the optical surfaces inside the detector from contamination.

The detection chamber employs carefully positioned sensors and a stable Class 1 laser light source to provide maximum response to a broad range of smoke types.

All alarm, service and event fault, along with the status of the detector are transmitted to displays and external systems via VESDAnet.


VESDAnet™ is VESDA’s fault-tolerant communications protocol. VESDAnet provides a robust bi-directional communication network between all VESDA devices and can even provide continued operation during single point wiring failures. VESDAnet also introduces the possibility to the system to be programmed from a single location and forms the basis of the modular nature of the VESDA system.


AutoLearn is a unique software tool that monitors the ambient environment and sets the most suitable alarm thresholds (Alert, Action, Fire 1, Fire 2) during the commissioning process. This allows the system to produce the earliest possible warning of a potential fire event while reducing the likelihood of nuisance alarms.


Referencing by VLP detectors makes sure that external pollution does not interfere with the true smoke level that is detected in the protected areas. This is particularly important in areas that employ air handling systems that may be affected by pollution external to the controlled environment. Referencing allows the system to safely compensate for this transient state to provide continued detection without nuisance alarms.

Other Features

  • Four configurable alarm levels
  • Four inlet pipes
  • Event log
  • Easy to replace air filter
  • Modular design
  • Recessed mounting option
  • Clean air barrier optics protection

Listings and Approvals

CE - EMC and CPD

EN 54-20

  • Class A (30 holes / 0.05% obs/m)
  • Class B (60 holes / 0.06% obs/m)
  • Class C (100 holes / 0.08% obs/m)

Classification of any configuration is determined using ASPIRE2.

Tech Specs

Input Power

Supply Voltage 18–30 VDC
  Aspirator @ 3000 rpm Aspirator @ 4200 rpm
Power Consumption @ 24 VDC Quiescent With Alarm Quiescent With Alarm
Power 5.8 W 6.96 W 8.16 W 9.36 W
Current 240 mA 290 mA 340 mA 390 mA


Dimensions (W x H x D) 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
IP Rating IP30
Area Coverage Typically up to 2000 m2 (21500 sq. ft.), depending on local codes and standards
Pipe Size External Diameter 25 mm (1 in)
Internal Diameter 15–21 mm (9/16 in–7/8 in)
Programmable Relays 7 Relays, Contacts rated 2 A @ 30 VDC NO/NC Contacts
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)
Alarm Sensitivity Range 0.005%–20% obs/m (0.0015%–6.25% obs/ft)
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.

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: Air: -20° to 60°C (-4° to 140°F)*
Humidity: 10%–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°C to 85°C
Must not be exposed to sunlight or other radiation sources

Sampling Network

Aggregate pipe length 200 m (650 ft)
Maximum Single Length 100 m (328 ft)
Minimum flow per pipe 15 litres/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.

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

Referencing Compensation for external ambient conditions.
Four Alarm Levels Alert, Action, Fire 1 & Fire 2
Two Fault Warning Levels Maintenance and Major fault
Software Programmable Relays 7
Maintenance Aids Filter & Flow monitoring

* Product UL listed for use from 0°C to 38°C (32°F to 104°F).

Part Codes

LaserPLUS Detector, 2 blank plate, Std Display Module VLP-002
LaserPLUS Detector. 1 blank plate, LCD programmer, Standard Display VLP-012
 LaserPLUS Detector. Enclosure with 3 blank plates & fire & OK LED VLP-400
LaserPLUS Detector + FOK + Display VLP-402



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