VESDA VLF (LaserFOCUS) Aspirating Smoke Detector

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  • VLF-250

VESDA VLF (LaserFOCUS) Aspirating Smoke Detector

The VESDA VLF by Xtralis is an aspirating smoke detector ideal for small, business-critical spaces. Available in two models, the VLF-250 covers up to 250 m2 (2,690 sq. ft.), and the VLF-500 covers areas up to 500 m2 (5,380 sq. ft.).

The detector works by continually drawing air into sampling holes in a pipe network. The air is ltered and passed into a detection chamber where light scattering technology detects the presence of very small amounts of smoke. Detector status information is communicated on the detector display and via relays or optional interface cards.

Out-Of-The-Box Operation

The VLF can be installed and commissioned out-of-the-box without the need for a special interface or software programming tools.

In operation, the unique Smoke DialTM display provides the user with an instant understanding of a smoke event, even from a distance. Should a fault occur, the user simply opens the eld service door and activates the Instant Fault Finder feature to determine the speci c fault condition. This information can then be passed onto their re service company, ensuring that service technicians arrive onsite fully prepared.

Ultrasonic Flow Sensing

The patent-pending Ultrasonic Flow Sensing used in the VLF provides a direct reading of the sampling pipe ow rate. The system is immune to air temperature and pressure changes and is unaffected by contamination. The VLF is the rst air sampling smoke detector to use ultrasonic ow sensing.

Features

  • Out-of-the-box installation and commissioning.
  • Ultrasonic airflow sensing.
  • Laser-based absolute smoke detection.
  • Pre-engineered pipe network designs.
  • Programmable alarm thresholds.
  • Clean air barrier optics protections.
  • Instant recognition display.
  • Instant Fault Finder™.
  • AutoLearn™ Smoke.
  • AutoLearn™ Flow.
  • Field service access door.
  • Multiple event logging (in separate logs), up to 18,000 events.
  • Offline/online configuration capability.

Applications

The Xtralis VESDA VLF is a cost-effective solution for areas such as:

  • Local telecommunication exchanges.
  • Air handling units.
  • Smaller server rooms.
  • Correctional facilities.
  • Control rooms.
  • Utility control hubs.
  • Switch rooms.
  • Railway signal hubs.
  • Storage facilities.
  • Cabinets.
  • Hazardous areas (Class 1 Div 2).
  • Substations.

Technical Specification

  • Models : 
    • VLF-250 : 250 m2
    • VLF-500 : 500 m2
  • Voltage : 24V DC Nominal (18-30 V DC)
  • Current @ 24 VDC : 410 mA nominal, 490 mA in alarm
    • VLF-250 (250 m2) : 220 mA nominal, 295 mA in alarm
    • VLF-500 (500 m2) : 410 mA nominal, 490 mA in alarm
  • Dimensions (W x H x D) : 256 mm x 183 mm x 92 mm
  • Weight : Approx. 2 kg (4.4 lbs)
  • IP Rating : IP30
  • Mounting : Upright, inverted or horizontal
  • Ambient : 0°C to 39°C (32°F to 103°F)*
  • Tested to (EN54-20) : -10°C to 55°C (14°F to 131°F)
  • Sampled Air** : -20°C to 60°C (-4°F to 140°F)
  • Humidity : 5% to 95% RH, non-condensing
  • Maximum Pipe Lengths :
    • VLF-250 (250 m2) : 
      • 1 x 25 m (80 ft) (Max. 12 holes)
      • 2 x 15 m (50 ft) per branch (Max. 6 holes per branch)
    • VLF-500 (500 m2) :
      • 1 x 50 m (150 ft) (Max. 24 holes)
      • 2 x 30 m (90 ft) per branch (Max. 12 holes per branch)
  • Sampling Hole Options : Pre-Engineered Option or Maximum Pipe length in accordance with Pipe Modelling Design Tool (ASPIRETM)
  • Air Inlet Pipe : Accepts both metric and American standard pipe sizes Metric: 25 mm (1.05 in.) American Pipe: IPS 21 mm (3⁄4 in.)
  • Area Coverage :
    • VLF-250 : Up to 250 m2 (2,690 sq. ft.) depending on local codes and standards
    • VLF-500 : Up to 500 m2 (5,380 sq. ft.) depending on local codes and standards
  • Relay Outputs : 3 changeover relays (Fire 1, Action, Fault), Contacts rated 2A @ 30 VDC (max). NO/NC Contacts
  • Cable Access : 3 x 25 mm (1.05 in.) cable entries (1 rear entry, 2 top entry)
  • Cable Termination : Screw Terminals 0.2-2.5 mm2 (30-12 AWG)
  • Interfaces
    • Shown in Terminal Block Connections diagram, to right, plus an RS232 Programming Port. General Purpose Input (GPI) interface offers: Reset, Disable, Standby, Alarm set 1, Alarm set 2 and External Input functions.
  • Alarm Threshold Setting Range :
    • Alert, Action : 0.025 - 2.00% obs/m (0.008 - 0.625% obs/ft)
    • Fire 1, Fire 2 : 0.025 - 20.00% obs/m (0.008 - 6.25% obs/ft)
    • Individual Alarm Delays : 0 – 60 seconds
    • Two Alarm Threshold Settings : Either time or GPI based
  • Display
    • 4 Alarm State Indicators
    • Smoke Level Indicator
    • Reset, Disable and Test Controls
    • Fault and Disabled Indicators
    • Instant Fault Finder
    • Smoke and Flow AutoLearn Controls
  • Event Log : Up to 18000 events, time and date stamped in separate, non-volatile, logs for: Smoke Level, Flow Level, Detector Status and Faults
  • AutoLearn Smoke & Flow :
    • Automatically set acceptable alarm thresholds for both smoke and ow levels
    • Minimum 15 minutes, maximum 15 days (default 14 days)
    • During AutoLearn thresholds are NOT changed from pre-set values
  • Warranty Period : 2 years

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