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Xtrails VESDA VLI Product Manual

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VESDA VLI
Product Guide
June 2012
Document: 18500_A2
Part Number: 29674

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Summary of Contents for Xtrails VESDA VLI

  • Page 1 VESDA VLI Product Guide June 2012 Document: 18500_A2 Part Number: 29674...
  • Page 3 VESDA by Xtralis VESDA VLI 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.
  • Page 4 VESDA by Xtralis Scope The VESDA VLI Product Guide provides a comprehensive description of the VLI detector and its accessories. This guide introduces the VLI features, technical specifications and gives an understanding of its components and their function. You will also find instructions on installing, cabling and powering up the detector.
  • Page 5 VESDA by Xtralis VESDA VLI Product Guide 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.
  • Page 6 The minor low and minor high flow thresholds should be set at 85% and 115% respectively Additional information: VESDA VLI was successfully tested and passed the EN 54-20 fire tests with the following configurations: Class C with 64 holes and a Fire-1 setting of 0.15% obscuration/m Class B with 28 holes and a Fire 1 setting of 0.15% obscuration/m...

  • Page 7: Table Of Contents

    Preliminary System Check Pipe Network Design Design Considerations Installation Considerations Inlet Pipes Managing the Exhaust Air Configuration Connecting to a Standalone VESDA VLI Detector Connecting to a VESDA VLI on VESDAnet Access Levels Commands Configuration Options Default Settings Commissioning AutoLearn Smoke...
  • Page 8 VESDA VLI Product Guide VESDA by Xtralis Relay Configuration VESDAnet Interface Card ASPIRE2 Data Smoke Test Air Sampling Test Results Glossary Index www.xtralis.com...

  • Page 9: Introduction

    VESDA VLI Product Guide Introduction The VESDA VLI is an aspirating smoke detector (ASD) that provides very early warning of fire conditions by drawing air samples through an air sampling pipe network. The VLI detector is especially designed to operate in industrial applications under harsh and dirty environments.
  • Page 10 VESDA VLI Product Guide VESDA by Xtralis Easy mounting with steel support bracket Modular field replaceable parts for ease of servicing Replaceable aspirator, detection chamber and filters BACnet over Ethernet Local USB configuration port Easy cable termination access Imperial and metric pipe ports Rubberized finish to external housing 1.1.1...

  • Page 11: Product Information

    VESDA by Xtralis VESDA VLI Product Guide Product Information Detector Components The VLI detector contains a number of field-replaceable components. Legend A Front cover Chamber assembly with tertiary clean air filter B Intelligent Filter F Aspirator C Secondary Foam Filter G Base D Electrostatic Discharge (ESD) Cover...

  • Page 12: How The Vli Works

    VESDA VLI Product Guide VESDA by Xtralis How the VLI works The VLI detector continually samples air from the protected environment via a sampling pipe network (A). Upon entering the detector, the air passes four sets of ultrasonic flow sensors (B), then through the mixer compartment of the Intelligent Filter (C), where it is split between two pathways.
  • Page 13 VESDA by Xtralis VESDA VLI Product Guide 2.2.1 Clean Air Zero Clean Air Zero is a user-initiated feature which is primarily intended to safeguard against nuisance alarms. This is achieved by introducing clean air into the detection chamber and taking a reference reading. This reading is then offset against the actual environmental background to maintain consistent absolute smoke detection.

  • Page 14: Front Panel

    VESDA VLI Product Guide VESDA by Xtralis Front Panel The VLI detector provides the following information and control capability: Status LEDs: Alarm, Pre-Alarm, Disabled, Fault and Power. Controls: Reset and Disable button. RESET / DISABLE DISABLED Figure 2-3: Front Panel Controls and LEDs...
  • Page 15 VESDA by Xtralis VESDA VLI Product Guide RESET / DISABLE Button Resetting the detector unlatches all latched alarms and faults, returns relays to their normal state and clears the active event list. To reset the detector, press this button once.

  • Page 16: Communication Ports

    VESDA VLI Product Guide VESDA by Xtralis Communication Ports The majority of user operations are performed using software installed on a computer connected to the detector via one of the communication ports. The communication ports are located on the main board inside the detector. It is necessary to remove the front cover from the detector in order access these ports.

  • Page 17: Specifications

    (16.8 in x 12.5in x 7.1in) Weight 6.035 Kg (13.3Lbs) Operating Conditions Temperature: (To operate the VESDA VLI detector outside Ambient: 0° to 40°C (32° F to 104°F) these parameters please contact your Tested: -10° to 55°C (14°F to 131°F) nearest Xtralis Office) Sampled Air: -20°...
  • Page 18 Filter and flow monitoring Event reporting via VESDAnet, BACnet and event log Table 2-4: Ordering Information VESDA VLI Standalone VLI-880 VESDA VLI with VESDAnet Card VLI-885 VESDA VLI Remote Display with RTC7 VRT-Q00 VESDA VLI Remote Display with RTC0 VRT-T00 LCD Programmer VRT-100 Hand-held LCD Programmer...

  • Page 19: Dimensions

    VESDA by Xtralis VESDA VLI Product Guide Dimensions inch 7.08 B 426.5 16.8 C 316.5 12.46 70.2 2.76 1.77 5.87 1.34 60.3 2.37 26.7 1.05 70.2 2.76 4.13 L 206.3 8.11 Figure 2-4: Front Dimensions inch A 426.5 16.8 B 316.5 12.46 2.95...

  • Page 20: Vesdanet

    VESDA VLI Product Guide VESDA by Xtralis VESDAnet VESDAnet is a proprietary communications protocol which is used on a network that connects the VESDA range of smoke detectors, displays, programmers and remote units and enables them to communicate on a VESDAnet network.

  • Page 21: Accessories

    VESDA by Xtralis VESDA VLI Product Guide Accessories A range of optional accessories are available to augment the VESDAnet-enabled VLI-885 detector. 2.8.1 Remote Display Module The Remote Display Module provides real-time indication of the status of a VLI detector and a single zone.
  • Page 22 VESDA VLI Product Guide VESDA by Xtralis Legend LCD Display Keys Figure 2-7: Hand-held LCD Programmer Refer to the LCD Programmer Product Guide for further details. www.xtralis.com...

  • Page 23: Installation

    Standard Ethernet cable if configuration of the detector is to be done via the Ethernet interface. A High Level Interface (HLI), where it is necessary to connect to a VESDA VLI on VESDAnet. Figure 3-1: Type A to Type B USB Interface Lead...

  • Page 24: Mounting

    VESDA VLI Product Guide VESDA by Xtralis Mounting The VLI detector can be mounted in an upright or inverted position. Do not mount the detector with a sideways orientation as shown in Figure 3-2 below. Figure 3-2: Sideways orientation Ensure the mounting surface is flat as this allows an air tight seal to be achieved between the sampling pipe and the tapered air inlet pipes on the detector.
  • Page 25 VESDA by Xtralis VESDA VLI Product Guide Legend Detector Mounting bracket Locking Mechanism Figure 3-5: Mounting the detector www.xtralis.com...

  • Page 26: Wiring

    VLI. 3.2.1 Cabling Inlets The VESDA VLI contains four inlets for power, relay and network cabling, located on the upper and lower sides of the detector base. The holes have a diameter of 25.4mm (1 inch). Note: To maintain the specified IP rating, IP54-compliant cable glands must be used.
  • Page 27 VESDA by Xtralis VESDA VLI Product Guide Figure 3-7: Wire connection details for power terminals Power to Multiple Detectors Up to eight detectors may be daisy chained to the same power supply by connecting the PWR OUT power passthrough socket to the PWR IN socket on each subsequent detector.
  • Page 28 VESDA VLI Product Guide VESDA by Xtralis The USB port is used for initial configuration and local maintenance or servicing of the VLI using Xtralis VSC software. Use the Ethernet port for a permanent network connection to the detector to allow remote configuration or monitoring.
  • Page 29 VESDA by Xtralis VESDA VLI Product Guide Shield Shield Shield Shield Shield Shield Module 1 Module 2 Module 3 (VLI-885) Shield Shield Shield Shield Module 5 Module 4 Figure 3-11: Example closed loop VESDAnet network The VLI-885 detector is shipped with the VESDAnet A and B terminals looped. Remove the A and B links prior to connecting the detector to the VESDAnet.
  • Page 30 VESDA VLI Product Guide VESDA by Xtralis 3.2.5 Relays The relays, located on the main processor card, interface to the Fire Alarm Control Panel (FACP) to communicate faults, alarms and disabled states. Fault and Fire1 Relay Terminals Fault (Trouble) and Fire1 (Alarm) relay terminals are located on the main board inside the detector.
  • Page 31 VESDA by Xtralis VESDA VLI Product Guide 3.2.8 Typical Wiring to Fire Alarm Control Panel (FACP) The diagram below shows the correct way to wire VESDA detectors to a conventional fire alarm control panel (FACP). It also shows where an End Of Line (EOL) resistor is correctly installed.
  • Page 32 VESDA VLI Product Guide VESDA by Xtralis 3.2.10 Typical Wiring for Monitored GPI for PSU Monitoring (VLI-885 only) The diagram below shows the correct way to configure power supply monitoring with a VLI-885 detector. It also shows where an End Of Line (EOL) resistor is correctly installed.
  • Page 33 VESDA by Xtralis VESDA VLI Product Guide 3.2.11 Specify Backup Battery In the event of a mains power supply disruption, the VLI detector runs on a backup battery. The size of the battery is determined by: local codes and standards...

  • Page 34: Powering Up

    VESDA VLI Product Guide VESDA by Xtralis Powering Up After installing the detector it is necessary to power up the system. The power up sequence lasts approximately 15 seconds. The VLI detector does not have a power switch i.e it is an "always on" device which is activated by applying powered cabling to the power input terminal on the main board (Figure 3-7).

  • Page 35: Installation Checklist

    VESDA by Xtralis VESDA VLI Product Guide Installation Checklist Site Name Address Detector Serial Number(s) and 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.

  • Page 36: Preliminary System Check

    VESDA VLI Product Guide VESDA by Xtralis Preliminary System Check A preliminary system check is required after installing the VLI detector, before it is commissioned for use. The check can be conducted by connecting to the detector using the Xtralis VSC software. The preliminary systems check includes: Configuring the "pipes in use"...

  • Page 37: Pipe Network Design

    Refer to Section 4.4. for further information. VESDA VLI is specifically designed to cater for industrial applications where high background levels exist. It is recommended that minimum hole sizes of 3mm shall be used for these applications. Certain industrial applications will require the facility to conveniently blow out (Back Flush) the pipe network during maintenance regimes.

  • Page 38: Managing The Exhaust Air

    VESDA VLI Product Guide VESDA by Xtralis Each air inlet port allows maximum insertion of the sampling pipe to a depth of 15 mm. (0.60 in). This prevents the sampling pipes from damaging the flow sensors. While connecting the detector to the pipe network: Ensure a minimum length of 500mm (20in) of straight pipe before terminating the pipes at the air inlet ports of the detector.

  • Page 39: Configuration

    GPI functions default settings Connecting to a Standalone VESDA VLI Detector Once physical connectivity has been established (refer to Section 3.2.3), the Xtralis VSC software can connect to the VLI detector using one of a range of communication protocols. Connection methods must be defined and saved for future use within the Connection Manager in Xtralis VSC.
  • Page 40 VESDA VLI Product Guide VESDA by Xtralis 5.1.1 Creating a USB Connection 1. Open the VLI detector and connect the USB cable from the USB socket on the main board inside to a PC or laptop located near the detector with the Xtralis VSC software installed. Refer to Chapter 7 for further information on opening the detector.
  • Page 41 VESDA by Xtralis VESDA VLI Product Guide Figure 5-6: Enter a Connection Name 5.1.2 Creating an Ethernet (BACnet/IP) Connection Notes: If a number of detectors are networked via Ethernet, it is recommended that they be connected to a dedicated Ethernet switch and then the switch is connected further up in the network with adequate security measures to limit access only to authorized personnel.
  • Page 42 VESDA VLI Product Guide VESDA by Xtralis Note: The factory default IP Address for the VLI is 169.254.1.100. This allows direct connection between a PC or Laptop and the VLI using a standard Ethernet lead. To change the IP address it is necessary to connect to the VLI using a USB connection and use Xtralis VSC to edit the network settings for the detector.

  • Page 43: Connecting To A Vesda Vli On Vesdanet

    VESDA by Xtralis VESDA VLI Product Guide Connecting to a VESDA VLI on VESDAnet The following is required in order to access a VLI-885 via VESDAnet: the VESDAnet is physically connected, as described in Section 3.2.4. a High Level Interface (HLI) must be connected between the PC or Laptop with Xtralis VSC and an RS485 port in one of the devices on the VESDAnet.

  • Page 44: Commands

    VESDA VLI Product Guide VESDA by Xtralis Commands The following commands are able to be issued to the detector from the Device menu in the Xtralis VSC software: Table 5-2: Detector Commands Command Description Execute From Detector Xtralis VSC Disable The Disable command disables all the output relays associated with the detector.
  • Page 45 VESDA by Xtralis VESDA VLI Product Guide Table 5-2: Detector Commands (continued...) Command Description Execute From Detector Xtralis VSC Start AutoLearn Smoke In Xtralis VSC you will be prompted to set the period of time that the environment is monitored to allow the system to decide what smoke thresholds are most appropriate.

  • Page 46: Configuration Options

    VESDA by Xtralis Configuration Options The VESDA VLI device dialogue provides a range of configuration options. These settings are stored in the onboard memory of the detector, therefore any change made using Xtralis VSC which can be viewed on a VESDAnet will be visible on a programmer, and vice versa.
  • Page 47 VESDA by Xtralis VESDA VLI Product Guide 5.5.2 Smoke Threshold Options Smoke Threshold options provide the mechanism to set the smoke obscuration trigger point for each alarm level, and the ability to assign day or night thresholds to cater for different levels of activity in the protected area during these times.
  • Page 48 VESDA VLI Product Guide VESDA by Xtralis 5.5.3 Airflow Options Airflow options provide the ability to set: limits for what the detector considers to be normal airflow behavior for the sampling pipe network which pipe inlets are being used aspirator speed These settings should be confirmed in the ASPIRE2 design of the sampling pipe network.
  • Page 49 VESDA by Xtralis VESDA VLI Product Guide 5.5.4 Input / Output Options Input / Output options provide the ability to control the behavior of the General GPI and latching behavior of the fault and alarm relays. The unmonitored GPI can be configured to initiate a number of different actions - including, by default, a Remote Reset function.
  • Page 50 VESDA VLI Product Guide VESDA by Xtralis Table 5-3: Unmonitored GPI Operation (continued...) Function State Change Standby Mode The detector is disabled and the aspirator switched OFF when ≥ 5 VDC is at this terminal. Note: No Alarms can be generated in this state.
  • Page 51 VESDA by Xtralis VESDA VLI Product Guide 5.5.5 Relay Options Relay options provide the ability to determine which alarm or fault conditions the programmable relays respond to. Figure 5-15: Relay Options The Alarm relay is permanently assigned to Fire1, while the Fault Relay is permanently assigned to all fault and other non-alarm conditions, with the exception of Minor Fault.
  • Page 52 VESDA VLI Product Guide VESDA by Xtralis 5.5.6 Communications Options Communications options are available for the VESDAnet-enabled VLI-885 detector. They provide the ability to control network data transmission behavior. Refer to Section 5.6 for the default settings. Figure 5-16: VESDAnet Communications Options...
  • Page 53 VESDA by Xtralis VESDA VLI Product Guide 5.5.7 Referencing Options Referencing is a technique used to reduce false alarms. The VLI requires VESDAnet connectivity to separate detector located outside of the protected area, which is used to take readings of the background level of smoke and pollutants outside of the protected area. These readings are then referenced to the readings from the detectors in the protected area.

  • Page 54: Default Settings

    VESDA VLI Product Guide VESDA by Xtralis Default Settings Table 5-5: Default Settings Parameter Default Values Range Access Level Minimum Maximum Event Log - Events Smoke Level Enabled Alarms Enabled Faults Enabled User Action Enabled Thresholds Alert 0.2% obs/m 0.05% obs/m 1.990% obs/m...
  • Page 55 VESDA by Xtralis VESDA VLI Product Guide Table 5-5: Default Settings (continued...) Parameter Default Values Range Access Level Minimum Maximum VESDAnet enabled detectors Reference detector: Reference 100% 100% Dilution Delay 2 minutes 0 minutes 15 minutes Detector Comms: Preferred Port...
  • Page 56 VESDA VLI Product Guide VESDA by Xtralis This page is intentionally left blank. www.xtralis.com...

  • Page 57: Commissioning

    VESDA by Xtralis VESDA VLI Product Guide Commissioning The VLI 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 detector is programmed using Xtralis VSC software or LCD Programmer via VESDAnet.

  • Page 58: Autolearn Flow

    VESDA VLI Product Guide VESDA by Xtralis AutoLearn Flow AutoLearn Flow process is initiated within Xtralis VSC. During the AutoLearn Flow process, the detector determines the average and peak air flow levels monitored over time and sets suitable air flow thresholds that will not give rise to nuisance flow faults due to normal flow variations.

  • Page 59: Maintenance

    VESDA by Xtralis VESDA VLI Product Guide Maintenance To maintain the VLI detector at its peak performance level, the recommended maintenance schedule shown in Table 7-1 below should be followed. Table 7-1: Recommended maintenance schedule for the VLI detector Maintenance Check...

  • Page 60: Remove The

    VESDA VLI Product Guide VESDA by Xtralis Remove the Front Cover Several maintenance functions require that the front cover be removed from the VLI detector in order to perform them. The front cover is held on by four captive screws. It may be removed by turning the screws counter-clockwise.

  • Page 61: Replacing The Intelligent Filter

    VESDA by Xtralis VESDA VLI Product Guide Replacing the Intelligent Filter The detector constantly monitors the difference between the flow of filtered and un-filtered air into the manifold. The flow of filtered air decreases when compared to that of un-filtered air as dirt and other particles accumulate in the Intelligent Filter.

  • Page 62: Replacing The Secondary Foam Filter

    VESDA VLI Product Guide VESDA by Xtralis Replacing the Secondary Foam Filter To maintain the operational integrity of the detector, it is recommended that the Secondary Foam Filter be replaced every 4 years, or when a filter fault occurs. It may be necessary to replace the filter more often where the detector is installed in environments that experience high levels of contamination.

  • Page 63: Replacing The Aspirator

    VESDA by Xtralis VESDA VLI Product Guide Replacing the Aspirator Ensure the area surrounding the aspirator is clear of dirt and debris prior to replacement. Care must be taken during aspirator replacement. The aspirator must be correctly seated; this is essential to ensure gaskets are not damaged or dislodged from the underside of the aspirator.

  • Page 64: Replacing The Detection Chamber Assembly

    VESDA VLI Product Guide VESDA by Xtralis Replacing the Detection Chamber Assembly Notes: It is important to precisely follow the sequence below in order to avoid kinking the tubes Remove the longer tube near the secondary filter first, followed by the shorter tube near the aspirator.
  • Page 65 VESDA by Xtralis VESDA VLI Product Guide 6. Use a 10mm spanner or a large flat bladed screwdriver to press down on the black ring near the secondary filter (B) whilst simultaneously using the other hand to remove long tube (Figure 7-9).
  • Page 66 VESDA VLI Product Guide VESDA by Xtralis 8. Gently remove the Chamber. To prevent the tube from kinking, lift the chamber while removing the tube (Figure 7-11). Figure 7-11: Lift Chamber 9. Unlock the connection arms and disconnect the ribbon cable from the main board (Figure 7-12).
  • Page 67 VESDA by Xtralis VESDA VLI Product Guide Install a new Chamber Assembly 1. Ensure that the 24V input is still disconnected. 2. Plug the ribbon cable from the chamber into the main board (Figure 7-12). Ensure that the cable connector is fully in and arms are locked.
  • Page 68 VESDA VLI Product Guide VESDA by Xtralis 5. Insert the short tube into the Cartsick connector under the fan and lower the chamber while inserting (Figure 7-15). Figure 7-15: Lift Chamber 6. Insert the short tube until the white tape touches the black ring on the Carstick connector (Figure 7-16).
  • Page 69 VESDA by Xtralis VESDA VLI Product Guide 7. Insert the long tube near the Secondary Foam Filter Carstick connector and lower the chamber whilst inserting (Figure 7-17). Figure 7-17: Insert Long Tube 8. Insert the long tube until the white tape touches the Carstick connector.

  • Page 70: Spare Parts

    VESDA VLI Product Guide VESDA by Xtralis Spare Parts Gray-colored internal components such as the Intelligent Filter, Secondary Foam Filter, Detection Chamber and Aspirator are field-replaceable. Table 7-2: Suggested spare parts stock Part No. Description VSP-030 VLI Intelligent Filter VSP-031...

  • Page 71: Troubleshooting

    VESDA by Xtralis VESDA VLI Product Guide Troubleshooting If the VLI detector identifies a fault condition, the Fault LED on the front of the detector illuminates and an event containing details of the condition is written to the active event list.

  • Page 72: Troubleshooting With A Remote Display

    VESDA VLI Product Guide VESDA by Xtralis Troubleshooting with a Remote Display If a Remote Display unit is connected to the detector, the specific fault type will be indicated on the Remote Display. The fault types shown on the display are listed below in Table 8-1.

  • Page 73: A Commissioning Forms

    VESDA by Xtralis VESDA VLI Product Guide A Commissioning Forms This is the main commissioning form for each customer site. Table A-1: VESDA commissioning form Customer Name Site Address Installer (Name & Contact) Commissioner (Name & Contact) Checks Date: 1. Wiring Checked 2.

  • Page 74: Vli Detector Commissioning Form

    VESDA VLI Product Guide VESDA by Xtralis VLI Detector Commissioning Form For all VESDAnet systems, highlight the device, the zone or VESDAnet then select File > Print to file. Table A-2: VLI Detector commissioning form Address (Zone) VESDA Zone Name...

  • Page 75: Display/Relay Configuration

    VESDA by Xtralis VESDA VLI Product Guide Display/Relay Configuration Table A-3: Display/Relay Configuration commissioning form Button Lockout Enabled/Disabled Smoke Test Reset Disable AutoLearn Smoke AutoLearn Flow Relays Connected Yes/No GPI Connected Yes/No GPI Function Relay Configuration Table A-4: Relay Configuration commissioning form...

  • Page 76: A.6 Smoke Test

    VESDA VLI Product Guide VESDA by Xtralis Smoke Test Table A-7: Smoke Test commissioning form Test Results Test Method Type of Smoke Test Date Air Sampling Test Results Table A-8: Air Sampling Test results commissioning form Pipe 1 Pipe 2...

  • Page 77: B Glossary

    VESDA by Xtralis VESDA VLI Product Guide B Glossary Table B-1: Glossary Term Description A Aspirator Impeller type fan used to draw sampled air into the detector. AutoLearn Smoke A feature which allows the detector to learn its environment (background pollution, differences between day and night operations within the facility etc) in order to set appropriate alarm thresholds for that environment.
  • Page 78 VESDA VLI Product Guide VESDA by Xtralis Table B-1: Glossary (continued...) Term Description R Referencing Referencing is a technique used to reduce false alarms. It requires VESDAnet. A separate detector takes readings of the background level of smoke and pollutants outside of the protected area. These readings are then referenced to the readings from the detectors in the protected area.

  • Page 79: Index

    VESDA by Xtralis VESDA VLI Product Guide Index relay configuration smoke test VESDAnet interface card clean air access level Clean Air Zero event commands cancel AutoLearn flow accessories cancel AutoLearn smoke display module 15, 24 Clean Air Zero programmer 15, 24, 27, 30, 37, 44, 51, 65-66...
  • Page 80 VESDA VLI Product Guide VESDA by Xtralis disable 8, 71 display module 15, 24 EOL resistor 17, 24-25 intelligent filter 3-6, 29, 55, 64 20, 54, 58 IP54 3, 11 Ethernet isolate 15, 44, 69 event log 3, 12, 71...
  • Page 81 VESDA by Xtralis VESDA VLI Product Guide inlet pipes specifications inlet ports alarm range installation dimensions mounting weight network 3, 6, 11, 31, 71 standby 53, 55-58 network design 31-32 suction pressure network testing supply voltage size pipe flow rate...
  • Page 82 VESDA VLI Product Guide VESDA by Xtralis This page is intentionally left blank. www.xtralis.com...

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