VESDA Laser Focus 250 (VLF-250)

The VESDA VLF-250 detector is a very early warning smoke detector designed to protect small, business-critical environments of less than 250 m2 (2500 sq. ft.). The detector works by continually drawing air into sampling holes in a pipe network. The air is filtered 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 Dial 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 field service door and activates the Instant Fault Finder feature to determine the specific fault condition. This information can then be passed on to their fire 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 flow rate. The system is immune to air temperature and pressure changes and is unaffected by contamination. The VLF is the first air sampling smoke detector to use ultrasonic flow sensing.

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VLF 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

VLF Listings / Approvals

  • UL
  • ULC
  • FM
  • CFE
  • LPCB
  • VdS
  • ActivFire
  • CE - EMC and CPD
  • EN 54-20

- Class A (12 holes / 0.12% obs/m)
- Class B (12 holes / 0.35% obs/m)
- Class C (12 holes / 0.80% obs/m)

Classification of any configuration is determined using ASPIRE2.

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