VESDA VLF Aspirating Smoke Detector

Key Features

Overview

VESDA VLF by Xtralis provides superior very early warning, air-sampling smoke detection for small, business-critical spaces such as switch rooms, server rooms and cabinets.

VLF aspirating smoke detectors continually draw air into the sampling chamber via discrete sampling holes in an aspirating pipe network. The air is filtered before entering the chamber, where light scattering technology detects even a very small amount of smoke. The detector communicates its status information on its intuitive ‘smoke dial’ display and via relays or optional interface cards.

VESDA VLF is available in two versions:

VESDA VLF-250

VESDA VLF-250 aspirating smoke detectors are designed to protect small, business-critical environments of less than 250 m² (2,690 sq. ft.).

VESDA VLF-500

VESDA VLF-500 aspirating smoke detectors are designed to protect small, business-critical environments of less than 500 m² (5,380 sq ft).

Smoke Dial Display

VESDA’s unique Smoke Dial™ display gives the user an instant understanding of a smoke event. Smoke Dial™ uses a circular LED display and well-placed icons to provide a visual indication of smoke growth and alarm conditions, even from a distance.

In fault conditions, VESDA’s Smoke Dial™ display doubles up to provide VESDA’s innovative ‘Fault Finder’ feature – a smart diagnostic feature that provides instant and meaningful information of the detector’s status without the need for evaluation tools or additional programming. VESDA’s Fault Finding feature allows fire and maintenance staff to be better informed before arriving on site, saving time and reducing maintenance costs.

Ultrasonic Flow Sensing

VESDA VLF is the first air sampling smoke detector to use Xtralis’ patent-pending Ultrasonic Flow Sensing to provide a direct reading of the sampling pipe flow rate. This system immediately identifies and communicates any variances in the airflow and is unaffected by pressure and air temperature changes and is impervious to contamination.

Ease of Installation

VESDA VLF detectors provide out of the box installation and do not require a special interface or software programming tools

AutoLearn™

VESDA’s AutoLearn feature further assists the installation process by assessing environmental conditions and automatically setting acceptable smoke alarm and flow fault thresholds.

VESDA Software Compatibility

VESDA VLF detectors are fully supported by the VESDA System Configurator Software (VSC) which offers a high level of programming flexibility through its online and offline platform, and ASPIRE, that provides design wizards, isometric views, an automated design verification process and improved AutoBalance capabilities to simplify the design process.

Typical Applications

VESDA VLF aspirating smoke detectors provides very early warning air sampling detection for small areas such as:

• Local Telecommunication Exchanges
• Correctional Facilities
• Smaller Server Rooms
• Utility Control Hubs
• Control Rooms
• Railway Signal Hubs
• Switch Rooms
• Cabinets
• Storage Facilities
• Substations
• Air-handling Units

Approvals

The VESDA VLF is fully approved by VdS for safe use and installation in any European Union country and bears the CE mark to show that it complies with all the applicable Directives including the CPR, EMC and the Low Voltage Directive (LVD).

EN54-20:2006 + AC:2008 – Fire detection and fire alarm systems – Control and indicating equipment.

Tech Specs

Input Power	Voltage: 24Vdc Nominal (18-30 Vdc) Current @ 24Vdc VLF-250: 220 mA nominal, 295 mA in alarm VLF-500: 410 mA nominal, 490 mA in alarm
Dimensions (W x H x D)	256mm x 183mm x 92mm
Weight	Approximately 2kg (4.4 lbs)
IP Rating	IP30
Mounting	Upright, inverted or horizontal
Operating Conditions	Ambient: 0°C to 39°C (32°F to 103°F) Product UL listed for use from 0°C to 38°C (32°F to 100°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) Sampled Air temperature shall reach Ambient Detector temperature upon entry into Detector. Refer to Xtralis Design Guides & Application Notes for sampled air pre-conditioning. Humidity: 5% to 95% RH, non-condensing
Sampling Holes	VLF-250: Class A (12 holes / 0.12% obs/m) Class B (12 holes / 0.35% obs/m) Class C (12 holes / 0.80% obs/m) VLF-500: Class A (30 holes / 0.05% obs/m) Class B (30 holes / 0.15% obs/m) Class C (30 holes / 0.32% obs/m)
Sampling Network	Maximum pipe lengths VLF-250: 1 x 25m (80ft) (Max. 12 holes), 2 x 15m (50ft) per branch (Max. 6 holes per branch) VLF-500: 1 x 50m (150ft) (Max. 24 holes) 2 x 30m (90ft) per branch (Max. 12 holes per branch) Sampling Hole Options: Pre-Engineered Option or Maximum Pipe length in accordance with Pipe Modelling Design Tool (ASPIRE™)
Air Inlet Pipe	Accepts both metric and American standard pipe sizes Metric: 25mm (1.05 in.) American Pipe: IPS 21mm (¾ 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 @ 30Vdc (max). NO/NC Contacts
Cable Access	3 x 25mm (11/16in.) 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 flow levels Minimum 15 minutes, maximum 15 days (default 14 days) During AutoLearn, thresholds are NOT changed from pre-set values

Downloads

• VESDA VLF-250 Datasheet
• VESDA VLF-500 Datasheet
• VESDA VLF-250 Product Guide
• VESDA VLF-500 Product Guide

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