Early warning smoke detector less than 250 m2

Early warning smoke detector less than 250 m2

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.

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 field service door and activates the Instant Fault Finder feature to determine the specific fault condition. This information can then be passed onto their fire service company, ensuring that service technicians arrive onsite fully prepared.

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 fl ow sensing.

Specifications

Input Power

Voltage: 24V DC Nominal (18-30 V DC)

Current @ 24 VDC: 220 mA nominal, 295 mA in alarm

Dimensions (W x H x D) 256 mm x 183 mm x 92 mm (101/16 in x 71/5 in x 32/3 in)

Weight Approx. 2 kg (4.4 lbs)

IP Rating IP30

Mounting Upright, inverted or horizontal

Operating Conditions

Ambient: 0°C to 39°C (32°F to 103°F) *

Tested to: -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

Sampling Network

Maximum pipe lengths: 1 x 25 m (80 ft) (Max. 12 holes)

2 x 15 m (50 ft) per branch (Max. 6 holes per branch)

Sampling Hole Options: Pre-Engineered Option or Maximum Pipe length in accordance with Pipe Modelling Design Tool (ASPIRE2™)

Air Inlet Pipe

Accepts both metric and American standard pipe sizes

Metric: 25 mm (1.05 in.) American Pipe: IPS 21 mm (¾ in.)

Area Coverage

Up to 250 m2 (2500 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 • Fault and Disabled Indicators

• Smoke Level Indicator • Instant Fault Finder

• Reset, Disable and Test Controls • 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 fl 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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