LaserFOCUS

VLF-250
Product Guide
September 7, 2007
Document Number: 07208_18
Part : 20295
LaserFOCUS VLF-250 Product Guide VESDA®

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VESDA® LaserFOCUS VLF-250 Product Guide
Intellectual Property and Copyright
This document includes registered and unregistered trademarks. All trademarks displayed are the trademarks of their respective owners.
Your use of this document does not constitute or create a licence or any other right to use the name and/or trademark and/or label.
This document is subject to copyright owned by Xtralis AG (“Xtralis”). You agree not to copy, communicate to the public, adapt, distribute,
transfer, sell, modify or publish any contents of this document without the express prior written consent of Xtralis.

Disclaimer
The contents of this document is provided on an “as is” basis. No representation or warranty (either express or implied) is made as to the
completeness, accuracy or reliability of the contents of this document. The manufacturer reserves the right to change designs or
specifications without obligation and without further notice. Except as otherwise provided, all warranties, express or implied, including
without limitation any implied warranties of merchantability and fitness for a particular purpose are expressly excluded.

General Warning
This product must only be installed, configured and used strictly in accordance with the General Terms and Conditions, User Manual and
product documents available from Xtralis. All proper health and safety precautions must be taken during the installation, commissioning
and maintenance of the product. The system should not be connected to a power source until all the components have been installed.
Proper safety precautions must be taken during tests and maintenance of the products when these are still connected to the power source.
Failure to do so or tampering with the electronics inside the products can result in an electric shock causing injury or death and may cause
equipment damage. Xtralis is not responsible and cannot be held accountable for any liability that may arise due to improper use of the
equipment and/or failure to take proper precautions. Only persons trained through an Xtralis accredited training course can install, test and
maintain the system.

Liability
You agree to install, configure and use the products strictly in accordance with the User Manual and product documents available from
Xtralis.
Xtralis is not liable to you or any other person for incidental, indirect, or consequential loss, expense or damages of any kind including
without limitation, loss of business, loss of profits or loss of data arising out of your use of the products. Without limiting this general
disclaimer the following specific warnings and disclaimers also apply:
Fitness for Purpose
You agree that you have been provided with a reasonable opportunity to appraise the products and have made your own independent
assessment of the fitness or suitability of the products for your purpose. You acknowledge that you have not relied on any oral or written
information, representation or advice given by or on behalf of Xtralis or its representatives.
Total Liability
To the fullest extent permitted by law that any limitation or exclusion cannot apply, the total liability of Xtralis in relation to the products is
limited to:
(i) in the case of services, the cost of having the services supplied again; or
(ii) in the case of goods, the lowest cost of replacing the goods, acquiring equivalent goods or having the goods repaired.
Indemnification
You agree to fully indemnify and hold Xtralis harmless for any claim, cost, demand or damage (including legal costs on a full indemnity
basis) incurred or which may be incurred arising from your use of the products.
Miscellaneous
If any provision outlined above is found to be invalid or unenforceable by a court of law, such invalidity or unenforceability will not affect the
remainder which will continue in full force and effect. All rights not expressly granted are reserved.

Document Conventions
The following typographic conventions are used in this document.

Convention Description

Bold Used to denote: emphasis

Used for names of menus, menu options, toolbar buttons

Italics Used to denote: references to other parts of this document or

other documents. Used for the result of an action.

The following icons are used in this document

Convention Description

Caution: This icon is used to indicate that there is a danger to

equipment. The danger could be loss of data, physical damage,
or permanent corruption of configuration details.

Warning: This icon is used to indicate that there is a danger of

electric shock. This may lead to death or permanent injury.

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LaserFOCUS VLF-250 Product Guide VESDA®

Warning: This icon is used to indicate that there is a danger of

inhaling dangerous substances. This may lead to death or
permanent injury.

Contact Us

The Americas +1 781 740 2223

Asia +852 2297 2438

Australia and New Zealand +61 3 9936 7000

Continental Europe +41 55 285 99 99

UK and the Middle East +44 1442 242 330

www.xtralis.com

Codes and Standards Information for Air Sampling Smoke Detection

We strongly recommend that this document is read in conjunction with the appropriate local codes and standards for smoke detection and
electrical connections. This document contains generic product information and some sections may not comply with all local codes and
standards. In these cases, the local codes and standards must take precedence. The information below was correct at time of printing but
may now be out of date, check with your local codes, standards and listings for the current restrictions.
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, the user is encouraged to try to correct the interference by
one or more of the following measures; re-orientate or relocate the receiving antenna, increase the separation between the equipment and
receiver, connect the equipment to a power outlet which is on a different power circuit to the receiver or consult the dealer or an
experienced radio/television technician for help.
FDA
This VESDA product incorporates a laser device and is classified as a Class 1 laser product that complies with FDA regulations 21 CFR
1040.10. The laser is housed in a sealed detector chamber and contains no serviceable parts. The laser emits invisible light and can be
hazardous if viewed with the naked eye. Under no circumstances should the detector chamber be opened.
FM Hazardous Applications
3611 Hazardous Approval Warning: Exposure to some chemicals may degrade the sealing of relays used on the detector. Relays used on
the detector are marked “TX2-5V”, “G6S-2-5V” or “EC2-5NU”.
VESDA detectors must not be connected or disconnected to a PC while the equipment is powered in an FM Division 2 hazardous
(classified) location (defined by FM 3611).
FM Approved Applications
The product must be powered from VPS-100US-120, VPS-100US-220 or VPS-220 only.
ONORM F3014
ONORM F3014, transport times for all tubes (including capillaries) must not exceed 60 seconds from any hole. This means that the pre-
designed pipe networks that include capillaries cannot be used.
AS1603.8
The performance of this product is dependent upon the configuration of the pipe network. Any extensions or modifications to the pipe
network may cause the product to stop working correctly. You must check that ASPIRE2 approves alterations before making any changes.
ASPIRE2 is available from your VESDA ASD distributor.
AS1851.1 2005
Maintenance Standards. Wherever this document and the AS1851.1 differ, AS1851.1 should be followed in preference to this document.
European Installations
The product must use a power supply conforming to EN54: Part 4.

Regional regulatory requirement and notices for the VESDA LaserFOCUS

UL
For open area protection the fire alarm threshold (signal) that initiates an evacuation procedure via the Fire Alarm Panel must not be set
less sensitive than 0.625%/ft. The detector can send this signal via the Fire Alarm Panel Output signal or the Pre-alarm output signal.
ActivFire
The fire alarm threshold (signal) that initiates an evacuation procedure via the Fire Alarm Panel must not be set less sensitive than 1%m.

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VESDA® LaserFOCUS VLF-250 Product Guide

AFNOR
Table 3 on page 17: The maximum number of holes is 10.
Table 4 on page 18: The minimum hole size is 3mm; the maximum number of holes per branch is 5.
Table 5 on page 20: The minimum hole size is 3mm; the maximum number of holes per branch is 5.
Installation considerations on page 21: The maximum number of holes is 10.
Sampling Network on page 35: The maximum number of holes is 10.
If 20 holes are used, the minor low flow fault must be set to 90%.
EN 54-20
The product must use a power supply conforming to EN 54-4.
The product is compliant with EN 54-20 sensitivity requirements provided the following conditions are met:
- For a Class A detector, hole sensitivity must be better than 1.5% obscuration/m and transport time less than 60 seconds
- For a Class B detector, hole sensitivity must be better than 4.5% obscuration/m and transport time less than 60 seconds
- For a Class C detector, hole sensitivity must be better than 10% obscuration/m and transport time less than 60 seconds

The product is compliant with EN 54-20 flow monitoring requirements provided the following conditions are met:
- The minor low and minor high flow thresholds should be set at 80% and 120% respectively
- The flow through the detector predicted by ASPIRE2 should be in the range 12 to 24 lpm
These limits should be verified using ASPIRE2 during the design of the sampling pipe network.
Additional information:
- Class A detectors passed EN 54-20 approvals testing with 12 holes and 0.12% obscuration/m detector sensitivity
- Class B detectors passed EN 54-20 approvals testing with 12 holes and 0.35% obscuration/m detector sensitivity
- Class C detectors passed EN 54-20 approvals testing with 12 holes and 0.80% obscuration/m detector sensitivity

Product Listings
UL
ULC
FM
LPCB
VdS approval number G205060
NF
ActivFire (AS 1603.8)
CFE
CE (EN 50130-4 & EN 61000-6-3)

Document Number: 07208_18

Part Number: 20295

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LaserFOCUS VLF-250 Product Guide VESDA®

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LaserFOCUS VLF-250 Product Guide VESDA®

Scope ................................................................................................................................................1

Introduction to VESDA LaserFOCUS .............................................................................................1

General notification .................................................................................................................1

Installation ........................................................................................................................................1
Dimensions ..............................................................................................................................2
Detector mounting ..................................................................................................................3
Installing the smoke detector ...................................................................................................3
Installation procedure ..........................................................................................................4
Inverting the user interface display .....................................................................................5
Detector removal .....................................................................................................................6
Air inlet pipe connections ........................................................................................................7
Exhaust air pipe connections ..................................................................................................8
Wiring connections ..................................................................................................................8
Detector cabling requirements ............................................................................................8
GPI – General Purpose Input (Terminals 1 & 2) .................................................................9
Extra terminals (Terminals 3, 4, 5, 6 & 7) ..........................................................................11
Power supply (Terminals 8, 9, 10 & 11) ............................................................................11
Relays (Terminals 12 - 20) ................................................................................................12
Typical Wiring To Fire Alarm Control Panel (FACP) .........................................................13
Wiring To an Address Loop Module. .................................................................................13
Interface card ....................................................................................................................14
RS232 Compatible serial port ...............................................................................................14
Installation Checklist ..............................................................................................................15

Sampling Pipe Network Design ....................................................................................................16

Single pipe network ...............................................................................................................17
Branched pipe network ..........................................................................................................18
Return air sampling (return grilles) ........................................................................................19
Installation considerations .....................................................................................................21
Air sampling in a duct ............................................................................................................21

Commissioning ..............................................................................................................................22
General ..................................................................................................................................22
AutoLearn Smoke ..................................................................................................................22
AutoLearn Flow .....................................................................................................................23
VESDA System Configurator (VSC) ......................................................................................23
Commissioning smoke test ...................................................................................................24

Detector Overview .........................................................................................................................24

Features ................................................................................................................................24
Description ............................................................................................................................24
Applications ...........................................................................................................................25

Product Interface ...........................................................................................................................25

Front view ..............................................................................................................................26
Instant Recognition Display ...................................................................................................27
Controls and indicators ..........................................................................................................28
Interface information and control buttons ..........................................................................29
Detector control buttons ....................................................................................................30
Smoke level & Instant Fault Finder displays .........................................................................31
Smoke level display ..........................................................................................................32
Instant Fault Finder ...........................................................................................................32
VLF Troubleshooting with Instant Fault Finder .................................................................33

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VESDA® LaserFOCUS VLF-250 Product Guide

Factory Defaults ............................................................................................................................ 34

Specifications ................................................................................................................................ 35

Maintenance .................................................................................................................................. 38
Overview ............................................................................................................................... 38
Maintenance schedule .......................................................................................................... 39
Replace the Filter Cartridge (VLF) ........................................................................................ 39
Aspirator replacement ........................................................................................................... 40

Commissioning Forms ................................................................................................................. 42

VESDA Commissioning Form ............................................................................................... 42
LaserFOCUS VLF-250Detector Commissioning Form ......................................................... 43
Display/Relay Configuration ................................................................................................. 44
LaserFOCUS Relay Configuration ....................................................................................... 44
VESDAnet Interface Card (VIC-010) (plug-in) ..................................................................... 45
VESDAnet Multi-Function Relay Card (VIC-020/VIC-030) (plug-in) .................................... 45
Ancillary Devices ................................................................................................................... 45
ASPIRE2 Data ...................................................................................................................... 46
Smoke Test .......................................................................................................................... 46
Air Sampling Test Results .................................................................................................... 47

Glossary ......................................................................................................................................... 48

Frequently Asked Questions about VLF (FAQs) ........................................................................ 49

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VESDA® LaserFOCUS VLF-250 Product Guide

1.1 Scope
This manual describes the features of the VESDA LaserFOCUS, the specifications and
functions, installation requirements, commissioning and operation procedures. A schedule for
preventative maintenance is also provided.

1.2 Introduction to VESDA LaserFOCUS

The VESDA LaserFOCUS early warning air sampling smoke detector incorporates world leading
VESDA very early warning laser based aspirated smoke detection technology. It provides
localized fire risk management solutions for small, critical environments. The VESDA
2
LaserFOCUS VLF-250 monitors areas up to 250 m (2500 sq. ft.) dependant on local codes and
standards. The VESDA LaserFOCUS complements the existing VESDA detector range and has
been designed to provide simple installation and commissioning, absolute smoke detection and
reliable and consistent response to smoke events without being affected by false alarms.

General notification
Note: Prior to carrying out any work or maintenance on the VESDA LaserFOCUS take the
necessary steps to advise the monitoring authority that power may be removed and
the system disabled.

Caution: Electrostatic discharge precautions need to be taken prior to removing the front
cover from the detector otherwise damage may occur to the unit.

1.3 Installation
The VESDA LaserFOCUS detector is shipped with all the components necessary for installation
with the exception of pipe and associated materials.
Components include:
• 1 LaserFOCUS detector with fitted exhaust deflector.
• 1 Mounting bracket.
• 1 End of Line resistor (see GPI – General Purpose Input (Terminals 1 & 2) on page 9)
• 2 M4 x 20 mm locking screws
• this Product Manual
Check all components for damage and refer any concerns to your VESDA distributor.
Note: Removing the rear cover of the detector will void your warranty.
Note: Opening or removing the sealed laser detection chamber will void your warranty.

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LaserFOCUS VLF-250 Product Guide VESDA®

Dimensions
Legend
mm inches
A 256 10.08
B 182.8 7.20
C 134.0 5.28
D 204.0 8.03
E 36.0 1.42
F 25.5 1.00
G 27.0 1.06
H 92.1 3.63
I 182.8 7.20
J 180.0 7.09

Figure 1 - Dimensions of the detector

Legend
mm inches

A 236.3 9.30

B 120.0 4.72

C 4.5 0.18

D 230.0 9.06

E 100.0 3.94

F 50.0 1.97

G 40.0 1.57

Figure 2 - Dimensions of detector with mounting bracket

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VESDA® LaserFOCUS VLF-250 Product Guide

Detector mounting
The VESDA LaserFOCUS can be installed upright, inverted or horizontally.
Note: Ensure the smoke detector is mounted away from obstructions and below ceiling
level.

Caution: An exhaust deflector must be fitted for upright mounting, unless the exhaust port is
connected to a return air pipe.

Caution: Do not install this unit on its side. There is a risk of particulate and condensation
collecting on critical elements of the detector chamber reducing the detectors
performance.

Ensure that there is sufficient clearance to mount the detector, noting the location of air sampling
pipes and cable entry points. Owing to the rigid nature of the plastic pipe, installation must
provide for sufficient movement in all pipework (air inlet, air exhaust and cable pipes) to allow
pipe ends to be easily fitted and removed.

Legend
A Min. 200 mm (8 in.) below ceiling level

B Min. 500 mm (20 in.) from a wall or obstruction to allow access to the security tab

C Do not install the detector on its side

Figure 3 - Mounting location

Installing the smoke detector

In all installation cases the mounting bracket must be fitted (upright) as shown in figure 4,
“Mounting bracket orientation for upright and inverted mounting,” on page 5.
Note: Ensure the mounting surface is flat. This will permit an air tight seal to be achieved
between the sampling pipe and the tapered air ports on the detector.

Warning: Prior to drilling the attachment holes for the mounting bracket, ensure
that all mounting surfaces (i.e. walls, cabinet sides, etc.). are clear of
electrical wiring and plumbing.

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LaserFOCUS VLF-250 Product Guide VESDA®

Where the pipe network and cabling are already fitted, the bracket can be used to aid alignment
of the detector with the pipes. The Installation procedure below explains this process.

Installation procedure
o
Cut the air inlet pipe and exhaust pipe (if used) at 90 , and to the same length (for normal and
inverted mounting). Remove all rough edges. This is critical to obtain an air tight seal with the
smoke detector.
1. Position the air inlet centerline mark (A), see Figure 4, of the mounting bracket against the
end of the air inlet pipe.
2. In the cut out section of the mounting bracket mark a line across the top of the cut out if
metric size pipe is used or mark a line across the bottom of the cut out if Imperial size pipe
is used.
3. Slide the mounting bracket down (up for inverted mounting) until the top of the bracket
aligns with the marked line.
4. Mark off and drill the 2 bracket mounting holes (H).
5. Screw the bracket to the wall.
6. Hook the smoke detector onto the mounting bracket tabs and pull it down into place.
7. Use the two M4 x 20 mm locking screws provided and screw them into the screw holes on
the left and right side of the detector. See the items marked (F) in the Figure Detector
removal on page 7.
8. The air sampling pipe can now be attached and power connected.
(See section Wiring connections on page 19 for connection information).

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VESDA® LaserFOCUS VLF-250 Product Guide
For inverted installation, to mark off the location of the mounting holes, follow steps 1 – 4 with the
mounting bracket inverted to that shown in figure 4, “Mounting bracket orientation for upright and
inverted mounting,” on page 5. Also see Inverting the user interface display on page 5.
A B C D D E Legend
A Air inlet port centerline

F B Exhaust air port centerline

G C Cutout

D Cable entry centerlines

H
E Mounting tab

F Metric OD 25 mm pipe mark

G Imperial IPS ¾ in. pipe mark

J I H Bracket mounting holes

I Centerline of detector

J Anti-tamper clip

Figure 4 - Mounting bracket orientation for upright and inverted mounting

Legend
C
A Security tab
D
B Finger clip
A
C Mounting tab

B D Anti-tamper clip

E Centerline of detector

Figure 5 - Mounting bracket rear view

Inverting the user interface display

Caution: Electrostatic discharge precautions need to be taken prior to removing the front
cover from the detector.

For inverted mounting applications, the VESDA LaserFOCUS will require the user interface
o
display to be turned through 180 . This is carried out prior to installing the detector. Also see
Mounting bracket orientation for upright and inverted mounting on page 5.
Inverting the user interface display:

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LaserFOCUS VLF-250 Product Guide VESDA®

1. Place the detector on its back, push in the securing tab and lift up the field service access
door. (See Figure 25, “Field Service Access Door security tab and clip,” on page 28).
2. Remove the 2 retaining screws and lift off the main cover.
3. Disconnect the restraining strap from the clip (C) and the ribbon cable from the user
interface card (B) and place the cover aside.
4. Open the clips (E).
o
5. Lift out the user interface display card, carefully turn it through 180 and then clip it back into
place.
6. Reconnect the ribbon cable and the restraining strap.
7. Replace the main cover and screw down the 2 retaining screws.
8. Close the field service access door.
The detector is now ready for inverted installation.

A C
B
E
D

E
B

Legend
A Ribbon cable clip D Interface card

B Ribbon cable connector E Clip

C Retaining strap clip F Air filter cartridge cavity

Figure 6 - Inside view of the front cover (as it would appear inverted)

Detector removal
Caution: Electrostatic discharge precautions need to be taken prior to removing the front
cover from the detector otherwise damage may occur to the unit.

Note: Take the necessary steps to advise the monitoring authority of work being carried
out and that the system needs to be disabled.

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VESDA® LaserFOCUS VLF-250 Product Guide
1. Turn off the power to the detector.
2. Disconnect the sampling pipes.
3. Push in the security tab and lift up the field service access door, see Figure 25, “Field
Service Access Door security tab and clip,” on page 28.
4. Unscrew the front cover retaining screws (E).
5. Lift off and swing down the front cover, a restraining strap will take the load. For inverted
mounted detectors the cover should be removed and placed aside.
6. Disconnect all field wiring from the terminal block.
7. Unscrew the two M4 x 20 mm locking screws on the left and right side of the detector. See
the items marked (F) in the Figure Detector removal on page 7
8. Use a screw driver to push down the anti-tamper clip in hole (A), at the same time, push the
detector base up.
9. Lift the detector off the mounting bracket.
Once the detector has been removed re-fit the front cover to keep the internal components safe
from damage and the electrical cabling safe.
Note: For inverted mounted detectors, the front cover will need to be removed prior to
unhooking the detector from the mounting bracket. Disconnect the retaining strap
and the ribbon cable from the user interface card and place the cover aside.

A F

E E

F
C
D

Legend
A Anti-tamper clip access hole D Aspirator

B Dual stage air filter cartridge E Retaining screw

C Terminal block F Bracket locking screw holes

Figure 7 - Detector removal

Air inlet pipe connections

The tapered shape of the air inlet port is designed to accept standard pipes of OD 25 mm
(ID 21 mm) or IPS ¾ in (OD 1.05 in) and provide an air tight seal.
Note: Do not glue the air inlet pipe to the detector. This will void your warranty.

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LaserFOCUS VLF-250 Product Guide VESDA®

Exhaust air pipe connections

Where the VESDA LaserFOCUS is located outside the protected area, consideration must be
given to returning the exhaust air to the protected environment to balance pressure differences
that may exist between the two areas. In the majority of applications, this is not necessary as
pressure differences are minimal.
In some circumstances, the pre-engineered solutions in this manual may not be suitable and it is
recommended that alternate designs are verified by a suitably qualified installer using ASPIRE2.
Examples of these circumstances are: where pressure differences exceed 50 Pa; in situations
where the detector is located outside the protected area; in cases where the are hazardous
substances inside the protected area eg hospital operating theatres, laboratories. In these cases,
the exhaust should be returned to the protected area.
Return air pipes need to be as short as possible to minimize the effect of airflow resistance in the
return air pipe network. Remove the fitted exhaust deflector and install a return air pipe where
required.
The air exhaust port is tapered to accept standard pipes of OD 25 mm (ID 21 mm) or
IPS ¾ in. and provide an air tight seal.
Note: Do not glue the exhaust air pipe to the detector. This will void your warranty.

Wiring connections
Caution: Electrostatic discharge precautions need to be taken prior to removing the front
cover from the detector otherwise damage may occur to the unit.

Detector cabling requirements

The screw type terminals located on the termination card within the VESDA LaserFOCUS will
2 2
accept wire sizes from 0.2 mm to 2.5 mm (30 – 12 AWG).
Refer to Codes and Standards Information for Air Sampling Smoke Detection on page iv for
code-specific requirements.
Refer to the VESDA System Design Manual for cabling details.

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VESDA® LaserFOCUS VLF-250 Product Guide
To reach the terminal block, open the field service access door, see Controls and indicators on
page 28, and then unscrew the front cover retaining screws. Lift off and swing down the front
cover. The terminal block is located on the right hand side of the detector.

Legend
A Terminal block, connectors 1 to 20

1
A

20

Figure 8 - Terminal block

GPI – General Purpose Input (Terminals 1 & 2)

The General Purpose Input (GPI) is a programmable input. When the GPI function parameter is
set to external, the detector shall indicate an external equipment fault condition by monitoring the
line impedance. An End of Line (EOL) resistor is supplied with the product and must be
assembled in parallel with the device to be monitored.
The EOL resistor provides a known termination to the external equipment, this allows the VLF to
detect open or short circuits. The detector monitors the EOL resistor, see Figure 8, and reports
any faults when the GPI function is set to any value, except None.

Caution: These terminal blocks come assembled and should NOT be disassembled.

Legend
1 GPI pin 1

2 GPI pin 2

Figure 9 - Terminal and plug set up, GPI connections

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LaserFOCUS VLF-250 Product Guide VESDA®

The GPI function parameter can be set to the values shown in the table below to achieve several
different functions:

GPI function
Result
parameter value

None GPI is disabled. If GPI will not be used we recommend that you
leave the EOL resistor assembled.

Reset Detector is reset on activation of the GPI (closing contact).

Note: The factory-default value of the GPI function is Reset.

Disable Detector is disabled while GPI is active (contact closed) and reset
on de-activation of the input (contact open).

Standby Detector is placed in standby (disabled, plus aspirator turned off)

while GPI is active (contact closed) and reset on de-activation of the
input (contact open).

Alarm set 1 Activation of GPI forces alarm threshold set 1 to be used. It

overrides normal selection.

Alarm set 2 Activation of GPI forces alarm threshold set 2 to be used. It

overrides normal selection.

External Detector indicates a fault while the GPI is active (contact closed).
Typically this is used to monitor external power supply units.
Note: If the contact is closed it will raise an Instant Fault Finder
No.6 fault. If wire is broken to the monitoring device it will raise an
Instant Fault Finder No.8 fault.

Table 1 - GPI programming

The GP input detects a short circuit (e.g. the PSU fault relay) at or below 100 Ohms.
Legend
C
A End of Line Resistor (2.7k)

A B B External device (1 to N)

C GPI Pin 1
D
D GPI Pin 2

Figure 10 - Triggering of GPI

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VESDA® LaserFOCUS VLF-250 Product Guide

Extra terminals (Terminals 3, 4, 5, 6 & 7)

Terminals reserved for future use.

Legend
3 Display Tx

4 Display Rx

5 Display Comm Gnd

6 Display Power -

7 Display Power +

Figure 11 - Terminal block display, spare power terminals

Power supply (Terminals 8, 9, 10 & 11)

Operating voltage: 24 VDC nominal (18 - 30 VDC)

Power consumption: 5.2 W nominal, 7.0 W in alarm

Current consumption: 220 mA nominal, 295 mA in alarm

It is recommended that the power supply be compliant with local codes and standards required
by the regional authority. For code-specific information, see Codes and Standards Information for
Air Sampling Smoke Detection on page iv.

Caution: Check the product termination wiring label during installation and subsequent
maintenance visits.

Legend
8 Power Return 0 VDC From power supply unit

9 Power in 24 VDC

10 Power Return 0 VDC To next detector (if more

than 1 detector per Power
11 Power Out 24 VDC Supply Unit)

Figure 12 - Terminal block display, power supply

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LaserFOCUS VLF-250 Product Guide VESDA®

Relays (Terminals 12 - 20)

The relays allow alarm and fault signals to be hard wired to external devices, such as fire alarm
control panels and loop interface modules away from the detector (example, sounding a siren at
Action threshold). Refer to the appropriate installation manual for connectivity instructions.

Legend NC Normally closed

contact of relay
12 NC Fault relay (with no power
applied).
13 Common
NO Normally open
14 NO contact of relay
(with no power
15 NC Action relay
applied).
16 Common
Common Common contact
17 NO for the relay.

18 NC Fire 1 relay

19 Common

20 NO

Figure 13 - Terminal block display, relays

NC Normally closed contact of relay (with no power applied).

NO Normally open contact of relay (with no power applied).

Common Common contact for the relay.

Note: By default, the Fault relay is normally energized when no fault is present. For
example when there is no fault present, terminal 12 is held open and terminal 14 is
held closed. When there is a fault present, terminal 12 is held closed and terminal
14 is held open.

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VESDA® LaserFOCUS VLF-250 Product Guide

Typical Wiring To Fire Alarm Control Panel (FACP)

The diagram below shows the correct way to wire VESDA laser detectors to a conventional fire
alarm control panel (FACP). It also shows where an End Of Line (EOL) resistor is correctly
installed.

To next detector
or EOL resistor

Detector Fire Panel (FACP)

Normally Closed (NC)

FIRE 1 Common (C) Input
Normally Open (NO) Short = Fire
Normally Closed (NC) Open = Fault
ACTION Common (C)
Normally Open (NO)

Normally Closed (NC)

FAULT Common (C)
Normally Open (NO) EOL
(NC)
GPI Reset (C)
(Set to reset) (NO)

Figure 14 - Typical wiring to a fire panel with EOL

Wiring To an Address Loop Module.

This wiring example is for wiring VESDA detectors to a typical Address Loop module 3 input 1
output. These are example drawings. Refer to the appropriate product manual for the exact
wiring details of the third party equipment.

Detector 3 output 1 input Loop Module

Normally Closed (NC) EOL

FIRE 1 Common (C) Fire Input
Normally Open (NO) Short = Fire
Open = Wiring Fault
Normally Closed (NC) EOL
ACTION Common (C) Pre Alarm
Normally Open (NO) Short = Fire
Open = Wiring Fault
EOL
Normally Closed (NC) Fault Input
FAULT Common (C) Short= Detector Fault
Normally Open (NO) Open = Wiring Fault

EOL (NC)
GPI Reset (C)
(Set to reset) (NO)

To Next Detector To FACP

Figure 15 - Addressable Loop Module with EOL

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LaserFOCUS VLF-250 Product Guide VESDA®

Interface card
The VESDA LaserFOCUS allows for the installation of a variety of interface cards. Refer to the
specific interface card installation sheet, product guide, or your local VESDA support person for
further information regarding installation and configuration of this card.

RS232 Compatible serial port

The RS232 serial port requires a standard 9-pin DB9 PC COM serial extension cable (male to
female) for configuring the detector using a PC with VESDA System Configurator (VSC)
installed, for status monitoring and command input, and for event log extraction and software
upgrades. For code-specific information, see Codes and Standards Information for Air Sampling
Smoke Detection on page iv.

Legend
A 9 Pin DB9 PC COM Serial
extension cable (male)

B Cutaway, exposing the

RS232 Serial Port
(female)
B

Figure 16 - 9 Pin connector and RS232 serial port

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VESDA® LaserFOCUS VLF-250 Product Guide

Installation Checklist
Site Name

Address

Detector Serial Number(s)

and Date of Manufacture

Interface Card Serial

Number & Date of
Manufacture

Name of Installer

Signature

Date

Perform the following checks listed below to ensure that all the necessary items are completed
before handing over to a commissioning engineer.

INSTALLATION CHECKS Yes No

1. Were the detector and the mounting bracket intact in the box?

2. Is the detector securely locked onto its mounting bracket? Note

that the two mounting bracket securing-screws are provided in a
separate bag with the detector.

3. Is the sampling air pipe firmly connected to the air inlet port?
Ensure the pipe is NOT glued.

4. Have the power wires been connected to the correct terminals on

the detector?

5. If required, has the end of line resistor been connected?

6. Have the alarm signalling wires been terminated to the correct

terminals of the detector?

7. Has the Interface card been correctly installed according to the

instructions provided (if applicable)?

8. Has the plug at the exhaust port been removed and the exhaust
pipe (if fitted) not glued?

9. Has the front cover been replaced correctly?

10.Has AutoLearn Flow and AutoLearn Smoke been performed?

Please state the AutoLearn Smoke period____________

11.Is the air sampling pipework installed and checked as per the site
plans?

Table 2 - Installation Checklist

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LaserFOCUS VLF-250 Product Guide VESDA®

1.4 Sampling Pipe Network Design

The VESDA LaserFOCUS supports a number of pre-engineered pipe network designs to simplify
installation. The pre-engineered pipe networks have been designed with pressure, flow and
transport time considerations. They have been verified and are shown below. For setup details
refer to the VESDA System Design Manual.
The pre-engineered designs assume the following constraints:
1. There must be no mixing of open hole and capillary tubes in a pipe network design. All
sampling points must be of the same type.
2. All sampling points must be evenly spaced in a pipe network design.
3. Branched designs must use the same number of sampling points along each branch.
4. Open hole designs must use the same size hole throughout the design.
5. Capillary tube designs must use the same size and length of capillary tube throughout the
design.
6. The distance from the detector to the first sampling point must be 1 to 2 times the distance
between sampling points. For example, if the sampling points are 4 meters apart, then the
distance from the detector to the first sampling point must be between 4 and 8 meters.
Given the constraints detailed above, the pre-engineered pipe network designs will provide:

Parameter Value

less than 60 seconds for open holes

Transport times
less than 90 seconds for capillary tubes

Suction pressure greater than or equal to 25 Pa across holes and capillary tubes

Detector pressure greater than 70 Pa

Flow rate 12 - 24 L/min

For alternate or complex pipe network designs including end caps with sampling holes use the
ASPIRE2 pipe modeling software to verify pipe performance. For code-specific information, see
Codes and Standards Information for Air Sampling Smoke Detection on page iv.

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VESDA® LaserFOCUS VLF-250 Product Guide

Single pipe network

The table below shows the appropriate hole sizes for pre-engineered designs for a single pipe
set up.

Single Pipe Network – max. length 25 m (80 ft.)

Sampling ID 21 mm Pipe IPS ¾ in. Pipe

holes
Open Hole 5.2 mm Capillary* Open Hole 3
/8 in. Capillary*
with 5 mm hole 1
with /8 in. hole

Hole Size (mm) Length (m) Hole Size (in.) Length (ft.)

3 3.5 – 5.0 0 – 0.8 5

/32 – /16
3 N/A

4 3.0 – 4.5 0.2 – 1.1 1 5

/8 – /32 0 – 12

5 3.0 – 4.0 0.3 – 1.5 1 5

/8 – /32 0 – 12

6 3.0 – 3.5 0.5 – 1.8 1

/8 – 0 – 12

7-12* Use ASPIRE2 to calculate hole sizes in this range*

Table 3 - Single pipe hole numbers and sizes

*For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.
The set up below shows a single pipe arrangement with 4 sampling holes and a fitted end cap
without a sampling hole.

Legend
A Smoke detector B Sampling hole C End cap (no hole)

Figure 17 - Open hole, single pipe

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LaserFOCUS VLF-250 Product Guide VESDA®

The set up below shows a single pipe arrangement with 6 capillary drop pipes and a fitted end
cap without a sampling hole.

Legend
A Smoke detector B Capillary tube C End cap (no hole)

Figure 18 - Capillary tubes, single pipe

Branched pipe network

The table below shows the appropriate hole sizes for pre-engineered designs for a branched
pipe set up.

Branched Pipe Network – max. length 15 m (50 ft.)

(2 branches) max. distance from detector to branch 5 m (15 ft.)

Sampling ID 21 mm Pipe IPS ¾ in. Pipe

Holes per
Branch Open Hole 5.2 mm Capillary* Open Hole 3
/8 in. Capillary*
pipe with 5 mm hole
1
with /8 in. hole

Hole Size (mm) Length (m) Hole Size (in.) Length (ft.)

2 3.0 – 4.5 0.1 – 1.1 1 5

/8 – /32 0 – 12

3 3.0 – 3.5 0.5 – 1.8 1

/8 0 – 12

4 2.5* – 3.0 0.7 – 2.4 1

/8 0 – 12

5-6* Use ASPIRE2 to calculate hole sizes in this range*

Table 4 - Branched pipe hole numbers and sizes

*For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.

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VESDA® LaserFOCUS VLF-250 Product Guide
The set up below shows a branched pipe arrangement with 5 sampling holes per branch and
fitted end caps without sampling holes.

Legend
A Smoke detector B Sampling hole C End cap (no hole)

Figure 19 - Open hole, branched pipe

The set up below shows a branched pipe arrangement with 3 capillary drop pipes per branch and
fitted end caps without sampling holes.

C
A

Legend
A Smoke detector B Capillary tube C End cap (no hole)

Figure 20 - Capillary pipes, branched pipe

Return air sampling (return grilles)

The VESDA LaserFOCUS is suitable for air sampling across return air grilles of Air Handling
2
Units. The recommended coverage of the VESDA LaserFOCUS is 0.4 m (4 sq. ft.) per sampling
hole. This should be considered in conjunction with local codes and standard.
o
Note: Rotate the air sampling hole approximately 45 away from the direction of the
incoming airflow and towards the grille surface. This will minimize the risk of a
Low Flow Fault being recorded in situations where air flow changes
(e.g. where the Air Handling Unit is turned off).

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LaserFOCUS VLF-250 Product Guide VESDA®

Some points to consider for setting up a pipe network are:

• sampling holes should be evenly spaced (within 20% of the separation distance to each
other)
• an un-vented end cap should be fitted to the end of the sampling pipe
• during installation, consideration should be given to the future maintenance requirements of
the air handling unit. Access to filters should not be restricted and pipe network should be
easily removable by the use of socket unions
For full details concerning return air grille sampling pipe network design, consult the VESDA
System Design Manual.
The table below shows the appropriate hole sizes for pre-engineered designs for return air grille
set ups.

Return Air Sampling – U Shaped design with equal holes on each side

Sampling ID 21 mm Pipe IPS ¾ in. Pipe

Holes
Hole Size (mm) Hole Size (in.)

4 3.0 – 4.0 1 5
/8 – /32

6 3.0 – 3.5 1
/8

8 3.0 3
/32

10 2.5 3
/32

Table 5 - Return air sampling pipe hole numbers and sizes

*For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.

A C

Legend
A Sampling pipe C Return grille

B Sampling hole D End cap (no hole)

Figure 21 - Return air sampling over an air handling unit grille

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VESDA® LaserFOCUS VLF-250 Product Guide

Installation considerations
Note: For code-specific information, see Codes and Standards Information for Air
Sampling Smoke Detection on page iv.
The VESDA LaserFOCUS VLF-250 smoke detector provides very early warning smoke
detection specifically for small environments.
The pre-engineered pipe network designs can support up to 6 sampling holes for single pipes
and 8 sampling holes for branched pipe arrangements. The number of sampling holes used can
1
be increased to 12 , however, ASPIRE2 will need to verify that the additional sampling holes can
be supported. Sampling holes are positioned according to the standards relating to conventional
point detector placement.
The pre-engineered pipe network solutions described in sections Single pipe network on page 10
and Branched pipe network on page 11 achieved transport times of less than 60 seconds for
open hole sampling and less than 90 seconds for capillary sampling.
Where the VESDA LaserFOCUS is located outside the protected area (e.g. in a corridor outside
the room), consideration must be given to returning the detector exhaust air to the protected
environment to balance the pressure differences that may exist. In the majority of applications,
this is not necessary as pressure differences are minimal. The exhaust should also be returned
to the protected area in cases where there are hazardous substances inside the protected area,
eg hospital operating theatres. Where practical considerations fall outside pre-engineered
designs or where pressure differences exceed 50 Pa, in situations where the detector is located
outside the protected area, the solutions presented in this manual may not be suitable and it is
recommended that alternate designs are verified by a suitably qualified installer using ASPIRE2.
The following points should be considered when installing the sampling pipe:
• minimize flexing in sampling pipes by supporting the pipe every 1.5 m (5 ft) or less, or at a
distance described in local codes and standards.
• evenly arrange the sampling pipe network over return air grilles
• sampling pipes fit firmly into the tapered detector ports, DO NOT glue this connection
• allow sufficient movement at the detector to permit pipe removal for maintenance
• keep the exhaust deflector fitted to prevent foreign objects falling into the detector
• keep the return air pipe as short as possible to minimize airflow resistance in the pipe
• pipe ends must be made smooth for bonding
• sampling holes must be drilled in line and perpendicular to the pipe.
• sample holes must be clear of rough edges and debris
• pipes are free of debris
• all joints must be bonded except the endcaps and pipes entering the detector
Note: In protected areas sampling holes should face into the direction of airflow, or point
downwards in static airflow situations.
Note: You should try to keep the sampling holes evenly spaced.
Note: For code-specific information, see Codes and Standards Information for Air
Sampling Smoke Detection on page iv.

Air sampling in a duct

For air sampling in a duct please refer to the VESDA System Design Manual for duct probe
design. For code-specific information, see Codes and Standards Information for Air Sampling
Smoke Detection on page iv.

1. For code-specific information, see Codes and Standards Information for Air Sampling Smoke De-
tection on page iv

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LaserFOCUS VLF-250 Product Guide VESDA®

1.5 Commissioning
General
The VESDA LaserFOCUS has been designed to simplify commissioning processes. The
AutoLearn function allows the unit to assess its environment and setup appropriate alarm and
flow thresholds. The unit may also be programmed through VESDA System Configurator (VSC)
software, for all programmable settings. For further information see Factory Defaults on page 34.
Note: Detectors should be commissioned with a smoke test.
Prior to commissioning the detector, check:
1. That the power is connected and on.
2. That the pipe network is clean and correctly fitted with all joints correctly seated and sealed
(except the endcaps and pipe which enters the detector which must not be glued).
3. That the exhaust deflector is fitted.
For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.

Legend
A AutoLearn Smoke button.

B AutoLearn Smoke indicator

C AutoLearn Flow indicator

D AutoLearn Flow button

Figure 22 - Interface display

Note: It is important that the protected area is working under normal operating conditions
when operating the AutoLearn processes.
Note: AutoLearn functions can be de-activated by a second press of the appropriate
button this will leave the thresholds at their default settings and not at the settings
prior to AutoLearn.

AutoLearn Smoke
AutoLearn Smoke is initiated by pressing the recessed button numbered 1, which is located
under the field service access door.
During the AutoLearn Smoke process, the VESDA LaserFOCUS determines the average smoke
and peak smoke obscuration levels and sets suitable alarm thresholds for the operating
environment. This process will minimize false alarms due to normal environment smoke variations.

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VESDA® LaserFOCUS VLF-250 Product Guide
The AutoLearn Smoke LED will remain on for the duration of the AutoLearn process. At the start
of the process the alarm thresholds are set to the default values. During this learning cycle, alarm
conditions can be reported. If an alarm condition occurs (Alert or higher alarm) AutoLearn will not
complete its cycle. In this situation restart the AutoLearn process. If AutoLearn is stopped by you
or due to an alarm condition, the alarm thresholds will be left at the default settings.
Conditions during learning are assumed to be representative of normal operating
conditions.
The AutoLearn Smoke learning times range from above 15 minutes to 15 days, with the default
being set to 14 days.
If AutoLearn is running during the changeover period from Day and Night Thresholds function,
make sure that AutoLearn runs for at least an hour in both the Day and Night.

Alarm Level AutoLearn Smoke Range

Alert 0.025 - 0.4 %obs/m (0.008 - 0.125 %obs/ft)*

Action 0.044 - 0.7 %obs/m (0.014 - 0.219 %obs/ft)*

Fire 1 0.063 - 1.0 %obs/m (0.020 - 0.313 %obs/ft)*

Fire 2 0.313 - 5.0 %obs/m (0.100 - 0.563 %obs/ft)*

Table 6 - AutoLearn Smoke range

*For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.

AutoLearn Flow
AutoLearn Flow process is initiated by pressing the recessed button numbered 2, which is
located under the field service access door. During the AutoLearn Flow process, the VESDA
LaserFOCUS determines the average and peak air flow levels monitored over time and sets
suitable air flow thresholds that will not give rise to false flow rates due to normal flow variations
(such as might arise through air-conditioning related false alarms). The system will normalize the
flow and then monitor the flow trend to set the flow fail thresholds.
The AutoLearn Flow indicator LED will remain on for the duration of the AutoLearn process. At
the start of the process the flow thresholds are set to the default values. During this learning
cycle, alarm conditions can be reported. If a flow fault is reached, AutoLearn will not complete its
cycle. In this situation restart the AutoLearn process. If AutoLearn is stopped by you or due to a
flow fault condition, the flow thresholds will be left at the default settings.
Conditions during learning are assumed to be representative of normal operating
conditions.
The AutoLearn Flow learning times range from 15 minutes to 15 days, with the default being set
to 14 days.

VESDA System Configurator (VSC)

The VESDA System Configurator is an optional tool that allows all VESDA detectors to be
configured. All parameters can be set manually or previously saved configuration settings may
be applied. Refer to the VSC online help for details regarding the setting of these thresholds.

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LaserFOCUS VLF-250 Product Guide VESDA®

Commissioning smoke test

It is recommended that a smoke test be carried out to prove the integrity of the pipe network, to
demonstrate that the system is working and to measure the transport time to the detector.
This test involves introducing a smoke sample at the furthest sampling hole and then measuring
the time taken for the smoke to travel to the detector. Results are logged and compared to
subsequent tests to note variations of the system.
See the VESDA System Design Manual for details of the commissioning smoke test.

1.6 Detector Overview

Features
• Laser Based Absolute Smoke Detection
• Wide Sensitivity Range
• Programmable Alarm Thresholds
• Dual Stage Air Filtration
• Instant Recognition Display
TM
• Instant Fault Finder
TM
• AutoLearn Smoke
TM
• AutoLearn Flow
• Ultrasonic Flow Sensing
• Referencing (requires a VESDAnet Interface Card)
• Field Service Access Door
• Separate Event Logging
TM
• Pipe Modeling Support Software – ASPIRE2
• VESDA System Configurator (VSC) for field support

Description
The Instant Recognition Display of the VESDA LaserFOCUS smoke detector shows alarm levels
and detector status information. The Smoke Dial, (see (F) in figure 23, “LaserFOCUS detector
front view,” on page 26, a part of the Instant Recognition Display, provides clear information of a
smoke event, relative to the Fire 1 Alarm Threshold. This display also identifies system and
operational faults, when using the Instant Fault Finder function. Each segment of the Smoke Dial
also corresponds to a specific fault condition.
A Field Service Access Door is provided to allow easy access to AutoLearn functions for detector
commissioning. It provides access for filter replacement and connecting a PC for comprehensive
configuration and diagnostics processes.
The detector uses Ultrasonic Flow Sensing to monitor the integrity of the sampling pipe network
by detecting pipe air flow change. Ultrasonic flow sensing is not affected by temperature,
humidity or pressure.
Detector history is provided by the non-volatile Event Logging feature. Smoke trend data, flow
trend data, fault events, configuration events and operational events are recorded. Using VSC
these event types can be filtered individually.

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VESDA® LaserFOCUS VLF-250 Product Guide

Applications
The VESDA LaserFOCUS can be used for open areas, return air grilles, or for cabinet protection
in many small areas including:
• telecommunication facilities
• computer rooms
• control rooms
• storage facilities
• electrical and switching cabinets
For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.

1.7 Product Interface

The VESDA LaserFOCUS provides the following information and control options without the
need for additional configuration tools.
• Detector status: Normal, Alarm, Disabled and Fault.
• Alarm levels: Alert, Action, Fire 1 and Fire 2.
• Smoke levels relative to Fire 1.
• Detector fault types (Instant Fault Finder).
• Test, Reset and Disable.
• AutoLearn Smoke (setting alarm thresholds).
• AutoLearn Flow (setting baseline for normalizing air flow and flow thresholds).

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LaserFOCUS VLF-250 Product Guide VESDA®

Front view
Front view of the detector as installed and operating. This view shows cable and air sampling
pipe entry points, the Instant Recognition display and the fitted exhaust deflector.

B C

Legend
A Air inlet port D Rear cable entry (not shown)

B Exhaust deflector E Instant Recognition Display

C Cable entry ports (x2) F Smoke Dial (includes Instant Fault Finder)

Figure 23 - LaserFOCUS detector front view

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VESDA® LaserFOCUS VLF-250 Product Guide

Instant Recognition Display

The Instant Recognition display provides you with an immediate understanding of smoke levels
relative to Fire 1 alarm threshold.

A
B
C
D

G
E

Legend
Option Definition LED Color

A FIRE 2 Indicates the Fire 2 threshold has been reached. Red

B FIRE 1 Indicates the Fire 1 threshold has been reached. Red

C ACTION Indicates the Action condition has been reached. Red

D ALERT Indicates the Alert condition has been reached. Red

E DISABLED Indicates the unit has been disabled (solid) or is in standby mode (flashing). Yellow

F POWER Illuminates when the detector is powered. Green

G FAULT Fault light continuously on indicates a Major Fault . When flashing indicates a Yellow
Minor fault.

Figure 24 - Instant Recognition Display

Note: There are two sets of Instant Recognition display icons; both are shown throughout
this manual. The international icon set can be identified by the lack of English text
beside the icons.

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LaserFOCUS VLF-250 Product Guide VESDA®

Controls and indicators

Control buttons are accessed by opening the field service access door. This door is opened by
pressing in the security tab, on the right side of the detector, with a flat screw driver and then
lifting the door by the finger clips on each side of the door (see Figure 3, “Field Service Access
Door security tab and clip,” on page 4).

Legend
C A Security tab

B Finger clip

C Field service access door

Figure 25 - Field Service Access Door security tab and clip

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VESDA® LaserFOCUS VLF-250 Product Guide

Interface information and control buttons

Interface information and control buttons are located behind the field service access door.

E
C
F
D
G
H

Legend
A Instant Fault Finder fault descriptions.

B Dual stage air filter cartridge.

C Alarm level definitions.

D Control buttons - Reset, Disable, (Instant Fault Finder) & Test.

E RS232 DB9F serial port.

F Control buttons - AutoLearn Smoke, AutoLearn Flow.

G Control button definitions.

H Security tab.

Figure 26 - LaserFOCUS detector with field service access door open

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LaserFOCUS VLF-250 Product Guide VESDA®

Detector control buttons

Icon Button Use Description

Reset Resets the Press and hold down this button to test
system and the function of LEDs on the unit.
resumes normal
To enable or lockout this button VESDA
operation.
System Configurator (VSC) software is
required.
Release this button to clear latched faults
and alarms. Alarm and fault lights will
switch off, and if the system is still in
alarm or fault mode, the lights will
reappear after the appropriate delay.

Disable Disables the fire This button allows the operator to toggle
relay outputs between disable and normal modes.
from actuating When disabled smoke and air flow are not
and reports a reported to the system (e.g. FACP).
fault.
To enable or lockout this button VESDA
Pressing Disable System Configurator (VSC) software is
for 6 seconds will required.
put the detector
The fan continues to run when VLF is
into Stand-by
disabled but stops when it is in stand-by
mode.
mode.

Instant Fault Indicates current Pressing and holding in the Reset button
Finder active faults on and the Disable button together will show
the detector. the fault type, by number, on the Smoke
Dial.
See “VLF Troubleshooting with Instant
Fault Finder” on page 33. for the fault
definitions.

Fire 1 Test Simulates a By default this button is locked out. To

Fire 1 condition activate this button VESDA System
and the alarm Configurator (VSC) software is required.
relay is activated
Note: Notify the monitoring authority
after the
before testing commences.
appropriate delay
To activate, press and release the Fire 1
Note: This will
Test button. All the segments of the
initiate a Fire 1
Smoke Dial, and alarm conditions up to
Alarm.
Fire 1 are activated (after the configured
delay period). Press the Reset button to
stop the test and clear any latched
alarms.
Note: Remember to return the system to
normal mode after the test is complete.

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VESDA® LaserFOCUS VLF-250 Product Guide

AutoLearn Automatically Pressing the recessed AutoLearn Smoke

Smoke sets alarm button initiates the automatic smoke
threshold values alarm set-up mode. The LED, beside the
based on the button, will remain on for the duration of
normal operating the AutoLearn process (up to 14 days
environment. which is also the default period). During
this period the unit is online, alarms are
See “AutoLearn
communicated and default thresholds are
Smoke” on
active. To deactivate this function, press
page 22.
the AutoLearn Smoke button again.

AutoLearn The detector Pressing the recessed AutoLearn Flow

Flow automatically button sets the airflow fault thresholds as
measures air flow well as normalizing the detector’s airflow.
to the pipes and The LED, beside the button, will remain
sets the air flow on for the duration of the AutoLearn
threshold values. process (up to 14 days which is also the
default period). To deactivate this
See “AutoLearn
function, press the AutoLearn Flow button
Flow” on
again.
page 23.

Table 7 - Detector Buttons

Smoke level & Instant Fault Finder displays

Under normal operating conditions the circular Smoke Dial displays smoke levels in sampled air.
Through Instant Fault Finder, the Smoke Dial temporarily changes the segments into fault
indicators, with each segment corresponding to a specific fault condition.

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LaserFOCUS VLF-250 Product Guide VESDA®

Smoke level display

The smoke level is displayed on the Smoke Dial (A) and provides incident information essential
for effective response in very early warning situations. This display provides you with an instant
understanding of the smoke event relative to the Fire 1 Alarm Threshold. Between 1 and 10
1
segments may illuminate. Each segment is equivalent to /10 of a Fire 1 warning.

C
A
D

Legend
A Smoke Dial and Fault Type indicator. C Disable button.

B Reset button. D Fault light.

Figure 27 - Smoke level and fault condition display

Instant Fault Finder

When a fault is registered on the detector, the fault light (D) remains on for Major Fault situations
and flashes for Minor Fault.
The Instant Fault Finder function is operated by pressing the Reset and Disable buttons together.
Instant Fault Finder provides rapid fault diagnosis and is an additional function of the Smoke Dial
display. One or more segments of the Smoke Dial will illuminate, indicating the fault by number.
The table below provides fault details and recommended actions.

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VESDA® LaserFOCUS VLF-250 Product Guide

VLF Troubleshooting with Instant Fault Finder

The Instant Fault Finder function aids rapid diagnosis of faults.

Fault Type Explanation Action

1 Filter Air filter needs replacement Replace the air filter with a new
due to dust or smoke unit remembering to reset the filter
contamination or has reached fault.
the end of its life.

2 Aspirator Aspirator fault has occurred. Initially replace the aspirator. If the
fault remains replace the VESDA
unit.

3 High flow High flow fault present (urgent Check the pipe network for
or non-urgent). Flow readings breakages. Also check the
are above user set flow limits suitability of the pipe network in
or the detector maximum flow ASPIRE2.

4 Low flow Low flow fault present (urgent Check the pipe network for
or non-urgent). Flow readings blockages. Also check the
are below user set flow limits suitability of the pipe network in
or the detector maximum flow ASPIRE2.

5 Not in use

6 External External equipment signaling a Inspect the external device and

Device/Power fault via the General Purpose also check that the GPI is set to
Supply Unit Input. the correct mode.
Also check that the EOL resistor is
correctly connected.

7 Interface card Interface Card needs Replace the Interface Card.

replacement.

8 Field wiring General Purpose Input or If no interface card is installed

Interface Card wiring. check the GPI wiring for an open
circuit.
If an interface card is installed refer
to the card manual.
Refer to GPI section of the
LaserFOCUS Manual

9 AutoLearn fail AutoLearn Smoke or Flow Repeat AutoLearn Smoke or Flow

failed. process. Inspect logs if repeated
failures occur. AutoLearn Flow will
fail if there is an airflow fault on the
detector. Fix airflow fault and re-
start AutoLearn

10 Detector A fault has occurred that Contact the supplier and replace
failure cannot be fixed. the detector.

Table 8 - Instant fault finder diagnosis

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LaserFOCUS VLF-250 Product Guide VESDA®

1.8 Factory Defaults

Parameter Allowed values Default values

Alert Smoke Threshold 1 & 2 0.025% - 2.0% obs/m* 0.08% obs/m

(0.008% - 0.625% obs/ft.) (0.025% obs/ft.)

Action Smoke Threshold 1 & 2 0.025% - 2.0% obs/m* 0.14% obs/m

(0.008% - 0.625% obs/ft.) (0.0448% obs/ft.)

Fire-1 Smoke Threshold 1 & 2 0.025% - 20% obs/m* 0.2% obs/m

(0.008% - 6.25% obs/ft.) (0.0625% obs/ft.)

Fire-2 Smoke Threshold 1 & 2 0.025% - 20% obs/m* 2.0% obs/m

(0.008% - 6.25% obs/ft.) (0.625% obs/ft.)

Alert Verification Delay 1 & 2 0 - 60 seconds 10 seconds

Action Verification Delay 1 & 2 0 - 60 seconds 10 seconds

Fire 1 Verification Delay 1 & 2 0 - 60 seconds 10 seconds

Fire 2 Verification Delay 1 & 2 0 - 60 seconds 10 seconds

Alarm Latching Enable Enabled or Disabled Enabled

Fault Latching Enable Enabled or Disabled Disabled

Airflow – Major High Flow Fault 100% - 150% 130%

Airflow – Major Low Flow Fault 50% - 100% 70%

Airflow – Minor High Flow Fault 100% - 150% 120%

Airflow – Minor Low Flow Fault 50% to 100% 80%

AutoLearn Smoke 15 min. – 15 days 14 days

AutoLearn Flow 15 min. – 15 days 14 days

Smoke Test Button Enable/Disable Disabled

Threshold set 1 and 2 Day (1) & Night (2) / Disabled

Disabled

Table 9 - Factory defaults

*For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.
Note: If installing the detector as an NF-compliant system, when the "AutoLearn smoke"
function is started, it is recommended to set the Fire1 threshold at a maximum value
of 1.15 %obs/m and disable the delays (or set to "Instant Fire").
Note: If installing the detector as a UL compliant system the alarm signal connected to the
control panel for the fire evacuation shall not be less than 2.0 %obs/m (0.64 %obs/
ft.).

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VESDA® LaserFOCUS VLF-250 Product Guide

1.9 Specifications
Power Supply

Supply Voltage 24 VDC nominal (18 - 30 VDC)*

Power Consumption @ 24 VDC 5.2 W nominal, 7.0 W in alarm*

Current Consumption @ 24 VDC 220 mA nominal, 295 mA in alarm*

*For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.

Case

Dimensions (WHD) 245 mm x 175 mm x 90 mm

5 7 1
(9 /8 in. x 6 /8 in. x 3 /2 in.)

Weight 2 kg (approx. 4.4 lbs)

IP Rating IP30

Mounting Upright, inverted or horizontal with appropriate

mounting bracket

Maintenance access Instant Fault Finder, Filter and Programming Port

Operating Conditions

Detector Ambient o o o o
0 C to 40 C (32 F to 104 F)

Sampled Air o o o o
0 C to 40 C (32 F to 104 F)

Humidity (non-condensing) 5% to 95 %

Sampling Network

Air inlet pipe OD 25 mm (ID 21 mm) / IPS ¾ in. (OD 1.05 in.)
Alternate pipe sizes can be modelled with ASPIRE2

Single pipe length 25 m (80 ft.) max.

Single pipe - Sampling holes 3-6 sampling holes pre-engineered

1
For 7-12 sampling holes model with ASPIRE2

Branch (2) pipe length 15 m (50 ft.) max. per branch

Branch (2) - Sampling holes per 2-4 sampling holes pre-engineered

branch
For 5-6 sampling holes model with ASPIRE2

Return Air Sampling – U Shaped 4-10 sampling holes pre-engineered

design per branch For 9-12 sampling holes model with ASPIRE2

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LaserFOCUS VLF-250 Product Guide VESDA®

1. For code-specific information see Codes and Standards Information for Air Sampling
Smoke Detection on page iv

Area Covered

VLF-250 2
250 m (2500 sq. ft.)

Field Wiring

Access 3 x 25 mm (1 in.) Cable entries (1 rear entry)

Terminals 2 2
0.2 mm - 2.5 mm (30 - 12 AWG)

Interfaces

Power In/Out.

Fire 1 Relay (changeover, 2A @ 30 VDC).

Action Relay (changeover, 2A @ 30 VDC).

Fault Relay (changeover, 2A @ 30 VDC).

General Purpose Input (clean contact).

External display port (with power limited output).

RS232 programming port.

Alarm Ranges

Alert, Action 0.025 – 2.0% obs/m (0.008 – 0.625% obs/ft.)*

Fire 1, Fire 2 0.025 – 20% obs/m (0.008 – 6.25% obs/ft.)*

Individual Delays 0 - 60 seconds

2 Threshold sets (1 & 2) Day and night

For code-specific information, see Codes and Standards Information for Air Sampling Smoke
Detection on page iv.

Display

4 Alarm State Indicators (Alert, Action, Fire 1 and Fire 2).

Fault and Disabled Indicators.

10-sector Smoke Level Indicators.

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VESDA® LaserFOCUS VLF-250 Product Guide

10-sector Instant Fault Finder.

Reset, Disable and Test Controls.

Smoke and Flow AutoLearn Controls and Indicators.

Event Log

Up to 18 000 events stored.

Smoke trend, flow trend, faults events, configuration events and operational events.

Date and time stamp.

AutoLearn Smoke & Flow

Minimum 15 minutes, maximum 15 days (default 14 days).

During AutoLearn, thresholds are NOT changed from pre-set values.

Referencing

Reference smoke level source for networked detectors (requires a VESDAnet Interface
card).

Ordering Information

VESDA LaserFOCUS VLF-250 VLF-250-00 European language set, English

display labels.
VLF-250-01 European language set,
International display labels.
VLF-250-02 English + Asian language set,
International display labels.
VLF-250-03 Scandinavian language set,
International display labels.
VLF-250-04 English + Russian language set,
International display labels.

Filter Cartridge VSP-005

Aspirator VSP-715

VESDAnet Interface Card VIC-010

Multifunction Control Card (MCC) VIC-020

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LaserFOCUS VLF-250 Product Guide VESDA®

Multifunction Control Card (MCC) VIC-030

with Monitored Powered Output
(MPO)

1.10 Maintenance
Overview
The VESDA LaserFOCUS smoke detector continuously monitors its own operation and conducts
frequent health checks. There are two serviceable items, the air filter cartridge and the aspirator.

Caution: Electrostatic discharge precautions need to be taken prior to removing the front
cover from the detector otherwise damage may occur to the detector.

A Legend
A Dual stage air filter
cartridge

B Aspirator

Figure 28 - Maintenance - replaceable items

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VESDA® LaserFOCUS VLF-250 Product Guide

Maintenance schedule
To maintain the VESDA LaserFOCUS smoke detector in peak working order follow the
maintenance standards for your region and where no recommended standard exists see the
table below. Please note, for environments that experience high levels of contamination, the
frequency of maintenance will need to be increased. Maintenance should be conducted by a
qualified service contractor.

Action Frequency Details

Check pipe 6 monthly Check pipe connections to ensure all pipe runs are
network intact and that pipe supports and joints are firm.

Airflow Yearly Check air flow via VSC software (refer to the VESDA
System Configurator Manual). Compare the current
reading with previous reading to determine if the flow
rate has reduced.

Smoke test Yearly Conduct smoke tests and verify detector performance
(refer to the System Design Manual).
Compare response times with those previously
recorded and investigate any discrepancies.

Check Yearly Test in accordance with suppliers instructions

power
supplies

Filter 2 Yearly Recommended change out period. The filter status can
replacement be checked via VSC software. Depending on the
environment, the filter may require more frequent
checking.

Clean As necessary If frequent low flow faults occur clean the sampling pipe
sampling network by back flushing (refer to the System Design
holes Manual).

Table 10 - Maintenance schedule

Replace the Filter Cartridge (VLF)

The VESDA LaserFOCUS smoke detector uses a disposable dual stage air filter cartridge. This
filter removes dust contamination from sampled air and provides a clean air bleed to preserve the
detector chamber optics. The detector constantly monitors filter efficiency. To maintain the
operational integrity of the smoke detector, it is recommended that the filter be replaced every
2 years, or when a filter fault occurs or more often for environments that experience high levels of
contamination.
A fault is raised on the detector, when the filter needs to be replaced. During the replacement
process the detector needs to be informed that a new filter has been installed.
Note: Prior to any work or maintenance being carried out on the VESDA LaserFOCUS
take the necessary steps to advise the monitoring authority that power may be
removed and the system disabled.
Note: Ensure the area surrounding the filter is clear of dirt and debris prior to replacement.
Note: The filter is for single use only, it cannot be cleaned and re-used.

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LaserFOCUS VLF-250 Product Guide VESDA®

Filter replacement steps

Ensure the detector remains powered up during filter replacement and a new filter cartridge is
available:
1. Push in the security tab and lift up the field service access door (A).
2. Set the detector to ‘Standby’ mode by pressing the Disable button for 6 seconds. The
Disabled LED begins to flash. After releasing the Disable button the disabled LED will
slowly flash.
3. Undo the recessed retaining screw (C) and pull out the old filter (B).
4. Using your finger, firmly press the filter switch (D) (in the filter recess of the detector) 5 times
within 5 seconds to confirm to the detector that a new filter is about to be installed (see
inset). A LED next to the serial interface will flash each time you push the filter switch, and
will continue flashing once you have successfully pressed the switch 5 times in 5 seconds.
5. Insert the new filter (VSP-005) and tighten the retaining screw.
6. Press the Disable button for 6 seconds to return the detector to normal operation.
7. Record the filter replacement date on the filter.
8. Close the field service access door.

Legend
A
C A Field service access door

B Dual stage air filter cartridge

D
C Retaining screw

D Filter switch

Figure 29 - Filter replacement

Aspirator replacement
Note: Prior to replacing the aspirator advise the monitoring authority that power will be
removed and the system disabled.

Caution: Electrostatic discharge precautions need to be taken prior to removing the front
cover from the detector otherwise damage may occur to the unit.

Aspirator removal (assumes normal mounting, see Figure 30):

1. Disconnect power to the detector.
2. Push in the security tab and lift up the field service access door.
3. Unscrew the two front cover retaining screws, lift and swing down the front cover.
4. Only disconnect the fan wiring loom from the connection point (E) at the aspirator.
5. Undo the retaining screw on the aspirator (A).
6. Swing out the aspirator, then lift and remove it from the detector.

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VESDA® LaserFOCUS VLF-250 Product Guide

Note: Any time the aspirator is removed ensure the area surrounding the aspirator is clear
of dirt and debris prior to replacement.
Note: Care must be taken during aspirator replacement. The aspirator must be correctly
seated; this is essential so that gaskets are not damaged or dislodged from the
underside of the aspirator.

Aspirator replacement steps

1. Clip the aspirator (VSP-715) into the retaining clip (D) and swing it back into the detector.
2. Tighten the retaining screw (A) (do not over tighten).
3. Reconnect the fan loom to the aspirator (E).
4. Replace the front cover and screw it into place.
5. Close the field service access door.
6. Reconnect power to the detector.

Legend
A Aspirator securing screw

B Swing aspirator out to remove

A
C Aspirator
B
D Retaining clip points

E Fan loom connector must be

disconnected here
C

D E

Figure 30 - Aspirator replacement

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LaserFOCUS VLF-250 Product Guide VESDA®

1.11 Commissioning Forms

VESDA Commissioning Form
This is the main commissioning form for each customer site.

Customer Name

Site Address

Installer (Name & Contact)

Commissioner (Name & Contact)

Checks Date:

1. Wiring Checked 1.
2. Detector Diagnostics 2.
3. Display Diagnostics 3.
4. Test Relay 4.

Client Representative Name

Test Witnessed By
Date:

Hand Over Documents

1. Copy of this form

2. ASPIRE2 Installation Data Pack
3. ASPIRE2 Bill of Materials
4. Commissioning form for each detector
5. Commissioning form for each relay card
6. Ancillary devices form
7. Smoke test results
8. Forms to comply with the local codes & standards

Customer’s Signature
Date:

Commissioner’s Signature
Date:

Table 11 - VESDA commissioning form

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VESDA® LaserFOCUS VLF-250 Product Guide

LaserFOCUS VLF-250Detector Commissioning Form

For all VESDAnet systems, highlight the device, the zone or VESDAnet then select File > Print to
file.

Address (VESDA
Zone)

VESDA Zone Name

Module type: VLF-250

Firmware version #

Card inserted: VESDAnet Interface card or Multi-relay card or None

Alarm Thresholds Significant

Smoke

Day Alert Instant Fire Enable/

disable

Action Filter Service

Period:

Fire1 Reference Address

Detector (Zone):

Fire2 Dilution%

Day/Night Enable/Disable Delay

Changeover (seconds)

Day Flow High Major

starts: Threshold %

Night High Minor

starts: %

Night Alert Low Minor

%

Action Low Major

%

Fire1 Delay
(seconds)
Networked

Fire2 Flow
Averaging
Period
(sec)
Standalone

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LaserFOCUS VLF-250 Product Guide VESDA®

Delay Alert Airflow

Action Raw Flow L/min

Fire1 % Flow %

Fire2 Maximum sec.

Transport
Time
observed

Table 12 - LaserFOCUS VLF-250 Detector commissioning form

Display/Relay Configuration
Button Lockout Enabled/Disabled

Smoke Test

Reset

Isolate

AutoLearn Smoke

AutoLearn Flow

Relays Connected Yes/No

GPI Connected Yes/No

GPI Function

Table 13 - Display/Relay Configuration commissioning form

LaserFOCUS Relay Configuration

Relay 1 2 3 Start-up Latching

Fault 9
Action 9
Fire1 9
D= Normally De-energized; E= Normally Energized

Table 14 - LaserFocus Relay Configuration commissioning form

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VESDA® LaserFOCUS VLF-250 Product Guide

VESDAnet Interface Card (VIC-010) (plug-in)

VESDAnet Interface Card Installed Yes/No

Card Serial Number

Preferred Port Port A/Port B

Loop Open Ended on this card Yes/No

Table 15 - VESDAnet Interface Card commissioning form

VESDAnet Multi-Function Relay Card (VIC-020/VIC-030)

(plug-in)
Relay Relay Relay Relay MPO GPI Start- Latch-
1 2 3 up ing

Alert 9 9
Fire2 9
Disabled

Standby

Disable MPO

Monitor
External
Device

Table 16 - VESDAnet multi-function relay card commissioning form

Ancillary Devices
Ancillary devices includes any remote displays, remote relay cards, AOM and
SRM assigned to this LaserFOCUS detector
Device Name

Device Serial No.

Firmware Version

Location

Table 17 - Ancillary devices commissioning form

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LaserFOCUS VLF-250 Product Guide VESDA®

ASPIRE2 Data
Group 1 Group 2 Group 3 Group 4

Aggregate Sensitivity

Balance

Suction Pressure (least)

Endcap Sensitivity Factor

Pipe Flow Rate (L/min)

Table 18 - ASPIRE2 Data commissioning form

Smoke Test
Test Results

Test Method

Type of Smoke

Test Date

Table 19 - Smoke Test commissioning form

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VESDA® LaserFOCUS VLF-250 Product Guide

Air Sampling Test Results

Pipe or Branch 1 Branch 2

Transport Time from

End Cap Hole

Test 1 Initial Response

Alert

Action

Fire 1

Fire 2

Peak Smoke

Test 2 Initial Response

Alert

Action

Fire 1

Fire 2

Peak Smoke

Table 20 - Air Sampling Test results commissioning form

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LaserFOCUS VLF-250 Product Guide VESDA®

1.12 Glossary
A Aspirator Impeller type fan used to draw sampled air into the
detector.

C Capillary Tubes Flexible tubes attached to the sampling pipe network for
sampling specific areas or objects away from the
sampling pipe.

D Disable Disables the fire relay outputs from actuating

(previously known as Isolate) and indicates a fault.

Dual Stage Air Filter A disposable air filter cartridge used in VESDA
Cartridge LaserFOCUS detectors that removes dust
contamination from sampled air and provides a clean air
bleed to maintain the Laser chamber optics.

E Event Log All VESDA detectors provide internal data logging of

events which have occurred in the VESDA protected
zone.

F FCC Compliance Federal Communications Commission.

Fire 1 This indicates a serious situation and may lead to

automatic generation of a normal fire alarm.

Fire Alarm Control A panel which all fire detection products report their
Panel (FACP) status to.

G General Purpose Input The General Purpose Input is a programmable input.

(GPI)

H High Airflow Where there are 10 or more air exchanges per hour.
Environment

I Instant Fault Finder Illuminates one or more segments of the Smoke Dial
with corresponding fault numbers.

L LaserFOCUS An air sampling smoke detector using light scattering to

report smoke obscuration.

O Obscuration The reduction in light passing through a uniform length

due to the presence of particulates.

R Relay The connection on a VESDA detector which allows

external equipment to be hard wired to it and be
triggered when various conditions occur (example,
sounding a siren at Alert threshold).

S Sampling Network The pipe network constructed to allow the VESDA

detector to draw air for sampling.

Sensitivity Relative degree of response (i.e. activation of alarm

condition) of a detector. A high sensitivity denotes
response to a lower concentration of smoke than a low
sensitivity, under identical smoke build-up conditions.

V VESDA Brand name for the range of smoke detectors.

VSC VESDA System Configurator, a PC based program tool.

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VESDA® LaserFOCUS VLF-250 Product Guide

2.13 Frequently Asked Questions about VLF (FAQs)

Note: For FAQs not specifically related to VLF, please visit www.xtralis.com.
What are the order numbers for the VESDA LaserFOCUS detectors?
Part Numbers can be found on the datasheets (visit www.xtralis.com to download datasheets).
Where do I obtain an approval certificate for my VESDA LaserFOCUS?
Visit the approval website or www.xtralis.com for the latest information.
What do the buttons on the VESDA LaserFOCUS front panel do?
The RESET button resets all latching faults.
The DISABLE button disables the fire relay outputs and reports a fault.
Pressing the DISABLE button for 6 seconds will put the detector into Stand-by mode.
Pressing RESET and DISABLE simultaneously accesses the Instant Fault Finder function. A
number flashes on the round display to indicate which fault, if any, is present. The user interface
is described in the user panels beneath the service door.
The TEST button simulates a Fire 1 alarm condition and the alarm relay is activated after the
appropriate delay. Before pressing this button, you must ensure that the reporting device is
isolated to prevent the initiation of FIRE response actions.
AutoLearn Flow and AutoLearn Smoke will start the environment study to create specific
thresholds for the area being covered, assuming that the environmental conditions during the
study period are comparable to normal operating conditions. The default period for AutoLearn is
14 days. Pressing the AutoLearn Flow button also normalizes the detector’s airflow.
Pressing an AutoLearn button a second time aborts the AutoLearn function.
What are the permissible flow normalisation limits for VESDA LaserFOCUS detectors?
VLF-250: minimum = 12 liters per minute, maximum = 24 liters per minute
VLF-500: minimum = 12 liters per minute, maximum = 54 liters per minute.
What do I do if my VESDA LaserFOCUS is showing a flow rate of 0 l/min?
Check whether the unit is in standby mode on the front panel. Pressing the standby button for 6
seconds will cancel this mode, however, it is advisable to first identify the reason for the detector
being in standby mode. VSC will also indicate standby mode, usually with a blue box that
surrounds the detector in the VSC device tree. Check if there is a FLOW SENSOR FAIL fault. If
there is, you will need to return the detector for repair.
Why did VESDA LaserFOCUS AutoLearn Flow fail?
If the flow rate is outside of the detector operating limits, AutoLearn Flow will not work.
Why is VESDA LaserFOCUS AutoLearn Smoke having problems?
If a FIRE is detected, AutoLearn is aborted and the appropriate alarm raised. Environments with
a high background smoke or pollution level, where this background exceeds the original
threshold levels, will also cause AutoLearn to abort. AutoLearn should be run when the
environment is displaying typical operating conditions. The default AutoLearn period is 14 days.
When the Instant Fault Finder is pressed (Reset + Isolate buttons together), why do the
AutoLearn Flow and AutoLearn Smoke LEDs start flashing instead of the fault numbers
lighting up? The flashing stops when the blue buttons are released.

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LaserFOCUS VLF-250 Product Guide VESDA®

You have not pressed BOTH the RESET button and the DISABLE buttons simultaneously, you
have ONLY pressed the DISABLE button. To put the VLF into STANDBY you press and hold
down the DISABLE button until the AutoLearn LEDS and DISABLED LED blink. This means
keeping the button pressed for about 6 seconds. You do the same again to take the detector out
of STANDBY. So, what you are doing is the 1st stage of putting the detector into/out of
STANDBY. To make IFF work reliably, you need to press the RESET button BEFORE the
DISABLE BUTTON. Several seconds can elapse between pressing these buttons but take care
that you do not RESET the detector by accident.
Can the deflector be removed from the VESDA LaserFOCUS exhaust?
It is a tight fit but it can be removed. With all VESDA detectors, we recommend returning all
sampled air from the exhaust into the sampled environment.
How do I change the filter on my VESDA LaserFOCUS?
Refer to the VESDA Maintenance Guide, available on the website under www.xtralis.com for full
details. VLF detectors need to have the front cover lifted. Secure the replacement filter and
acknowledge the action via a configuration tool (VSC, VSM or programmer).
What do you recommend that the four VESDA LaserFOCUS alarm relays be used for?
‘Alert’, ‘Action’, ‘Fire 1’ and ‘Fire 2’. Check whether your local codes require specific relays to be
fixed. VLF has action and fire set to specific relays.
What are the order numbers for the VESDA LaserFOCUS demo kits?
All model numbers provided are Xtralis model numbers, check with your local distributor.
VKT-020 is the VLF-250-00 Demo Kit.
VKT-021 is the VLF-250-01 Demo Kit.
VKT-022 is the VLF-250-02 Demo Kit.
VKT-050 is the VLF-500-00 Demo Kit.
VKT-051 is the VLF-500-01 Demo Kit.
VKT-052 is the VLF-500-02 Demo Kit.

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VESDA® LaserFOCUS VLF-250 Product Guide

Index

A I

Applications ........................................25 Installation ........................................

1, 4
Area protected ...................................... 1 Instant fault finder ............................... 32
Aspirator replacement .......................... 40 Troubleshooting guide....................... 33
AutoLearn Flow ................................... 23 Instant recognition display ................... 27
AutoLearn Smoke ................................ 22 Inverted mounting ................................. 5

C M

Clearances ............................................ 3 Maintenance ....................................... 38

Commissioning ................................... 22 Aspirator replacement ....................... 40
Schedule ........................................ 39
AutoLearn flow ................................ 23
AutoLearn smoke ............................. 22 Mounting .............................................. 3
Smoke test ..................................... 24
Clearances .......................................
3
Contact Us ............................................ iv Orientation........................................
3
Surface ............................................
3
Control buttons ................................... 30
Mounting surface ................................... 3
Conventions ......................................... iii

D P

Pipe connections
Default settings ...................................34
Air inlet ............................................ 7
Detector removal ................................... 6
Exhaust ........................................... 8
Pipe network ....................................... 16
F Branched pipe ................................. 18
Duct .............................................. 21
FAQ ................................................... 49 Installation considerations .................. 21
Return air ....................................... 19
Features .............................................
24 Single pipe ..................................... 17
Field service access door ..................... 28
Frequently Asked Questions ................. 49 S

G Serial port ...........................................

14
Smoke dial .......................................... 32
Glossary ............................................. 48 Smoke level ........................................ 32
Smoke test.......................................... 24

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LaserFOCUS VLF-250 Product Guide VESDA®

Specifications ..................................... 35 W
U Wiring .................................................. 8
General Purpose Input ........................ 9
User interface...................................... 25 Power supply .................................. 11
Relays ........................................... 12
Spare terminals ............................... 11
V

VESDA System Configurator ................. 23

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LaserFOCUS VLF-250 Product Guide VESDA®

53