Essential details
Specification Number:VLF-250
Product Introduction
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 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.
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.
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 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.
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.
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 flow levels
• Minimum 15 minutes, maximum 15 days (default 14 days)
• During AutoLearn thresholds are NOT changed from pre-set values
Warranty Period
2 years
Ordering Information:
VLF-250-00 VESDA VLF. European language set. English display labels
VLF-250-01 VESDA VLF. European language set. International display labels
VLF-250-02 VESDA VLF. English + Asian language set. International display labels
VLF-250-04 VESDA VLF. English + Russian language set. International display labels
VLF-250-05 VESDA VLF. English + Eastern Euro language set. International display labels
VIC-010 VESDAnet Interface Card, VIC-020 Multifunction Control Card (MCC)
VIC-030 Multifunction Control Card (MCC) with Monitored Powered Output (MPO)
VSP-005 Filter Cartridge, VSP-722 Aspirator for VESDA VLF-250
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 flow levels
• Minimum 15 minutes, maximum 15 days (default 14 days)
• During AutoLearn thresholds are NOT changed from pre-set values
Warranty Period
2 years
Ordering Information:
VLF-250-00 VESDA VLF. European language set. English display labels
VLF-250-01 VESDA VLF. European language set. International display labels
VLF-250-02 VESDA VLF. English + Asian language set. International display labels
VLF-250-04 VESDA VLF. English + Russian language set. International display labels
VLF-250-05 VESDA VLF. English + Eastern Euro language set. International display labels
VIC-010 VESDAnet Interface Card, VIC-020 Multifunction Control Card (MCC)
VIC-030 Multifunction Control Card (MCC) with Monitored Powered Output (MPO)
VSP-005 Filter Cartridge, VSP-722 Aspirator for VESDA VLF-250