Net Safety UVU-140A Manual de usuario

UVU-140A AND UVU-140-AR

UNITIZED ULTRAVIOLET FIRE

DETECTOR

USER MANUAL

Part Number: MAN-0002-00 Rev. 1

Printed in Canada

This manual is provided for informational purposes only. Although the information contained in this manual is

believed to be accurate, it could include technical inaccuracies or typographical errors. Changes are, therefore,

periodically made to the information within this document and incorporated without notice into subsequent revisions of

the manual. Net Safety Monitoring INC. assumes no responsibility for any errors that may be contained within this

manual.

This manual is a guide for the use of a Unitized UV Fire Detector and the data and procedures contained within this

document have been verified and are believed to be adequate for the intended use of the detector. If the detector or

procedures are used for purposes other than as described in the manual without receiving prior confirmation of validity

or suitability, Net Safety Monitoring Inc. does not guarantee the results and assumes no obligation or liability.

No part of this manual may be copied, disseminated or distributed without the express written consent of Net Safety

Monitoring Inc.

Net Safety Monitoring Inc. products, are carefully designed and manufactured from high quality components and can

be expected to provide many years of trouble free service. Each product is thoroughly tested, inspected and calibrated

prior to shipment. Failures can occur which are beyond the control of the manufacturer. Failures can be minimized by

adhering to the operating and maintenance instructions herein. Where the absolute greatest of reliability is required,

redundancy should be designed into the system.

Net Safety Monitoring Inc., warrants its sensors and detectors against defective parts and workmanship for a period of

24 months from date of purchase and other electronic assemblies for 36 months from date of purchase.

No other warranties or liability, expressed or implied, will be honoured by Net Safety Monitoring INC

Contact Net Safety Monitoring Inc. or an authorized distributor for details.

TABLE of CONTENTS

CHAPTER1TECHNICALINFORMATION .......................................1

Introduction................................................................................ 1

Features .................................................................................. 1

SpectralSensitivityRange .................................................................... 1

Figure 1 - Various Spectral Distributions ............................................... 1

Specifications .............................................................................. 2

Applications ............................................................................... 3

CHAPTER2INSTALLATION .................................................4

What’sinthepackage ..................................................................... 4

MountingtheDetector ....................................................................... 4

Coneofvision ....................................................................... 4

Figure 2 - Detector cone of vision ..................................................... 4

Range ............................................................................. 4

EnvironmentalFactors ................................................................ 4

FalseAlarms ........................................................................ 5

PositionandDensityofDetectors ........................................................ 5

Figure 3 - Detector with Swivel Mount .................................................. 6

Figure 4 - Detector Dimensions ........................................................ 7

Figure 5 - Swivel Mount Dimensions ................................................... 7

Figure 6 - JB4-UV-T Junction Box Side View ............................................. 7

Figure 7 - JB4-UV-T Junction Box Top View ............................................. 7

GeneralWiringRequirements ................................................................. 8

WiringDiagramforUVU-140-A .......................................................... 9

Figure 8 - Wiring for UVU-140-A ........................................................ 9

WiringDiagramforUVU-140-AR ....................................................... 10

Figure 9 - Wiring for UVU-140-AR ..................................................... 10

DetectorSettings .......................................................................... 11

SystemSensitivity ................................................................... 11

Figure 10 - DIP switch operation and location ........................................... 11

Table1-DetectorSensitivitySettings ................................................... 11

SystemTimeDelay .................................................................. 11

Table2-AlarmResponseDelaySettings ................................................ 11

Table3-CoilandRelayStatus ........................................................ 12

CHAPTER3STARTUPANDTEST ...........................................12

StartupProcedure ......................................................................... 12

CheckOutProcedure ................................................................ 12

AutomaticviTest.................................................................... 12

TestProcedures: .................................................................... 13

ManualCheckProcedure .................................................................... 13

CHAPTER4NORMALOPERATION...........................................14

NormalOperation ......................................................................... 14

FireCondition ............................................................................. 14

Current&RelayOutputConditions ............................................................ 14

Table4-Current&RelayOutputConditions .............................................. 14

CHAPTER5MAINTENANCE ................................................15

RoutineMaintenance ....................................................................... 15

Troubleshooting ........................................................................... 15

CleaningViewingWindowandReflector ................................................. 15

RepositioningviAdjustmentAllenScrew ................................................. 15

DeviceRepairandReturn ................................................................... 16

Appendix A Net Safety Monitoring Inc. Electrostatic Sensitive Device Handling

Procedure ...............................................................17

Appendix B Common Ultra-Violet Absorbing Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

AppendixCWireResistanceInOhms ........................................19

Figure 1 - Various Spectral Distributions

CHAPTER 1 TECHNICAL INFORMATION

Introduction

The UVU-140-A & UVU-140-AR fire detectors provide fast, reliable flame detection in a wide variety of

applications. The automatic visual integrity (vi) feature allows for a continuous check of optical surfaces,

sensitivity and electronic circuitry of the unitized fire detector. Fire and fault identification are accomplished by

the use of specific current output levels and relay contacts (UVU-140-AR only). The fire detectors are housed in

explosion-proof enclosures that are designed to meet most national and international standards. They are

available in anodized aluminum or optional stainless steel. The UVU-140-A & UVU-140-AR fire detectors are

typically mounted with a swivel mounting assembly (see Figure 3).

The UVU-140-AR unitized fire detector connects to a JBR-T-ASSY which consists of a junction box, two relays

and a terminal connector board. The JBR-T-ASSY has large, easy access, spring tension terminals and a user

selectable dip switch which allows the operator to select relay and coil status conditions (see Table 3).

Features

<Instantaneous response to ultraviolet radiation

<Automatic and manual visual integrity (vi) testing

<Adjustable sensitivity and time delay

<All automatic test functions are performed with the system on-line

<Alarm and automatic fault identification indicated by a 4 to 20mA output

<Relay outputs for fire and fault identification (UVU-140-AR only)

<The fault relay is normally energized and non-latching (UVU-140-AR only)

Spectral Sensitivity Range

The UVU-140-A & UVU-140-AR fire detectors respond to radiation wavelengths of 185 to 260 nanometres

(1850 to 2600 angstroms). Figure 1 illustrates the range of sensitivity and compares this range to other forms of

radiation. Note that UV radiation reaching the earth from the sun does not extend into the sensitivity range of the

detector. Nor does radiation from normal artificial lighting, such as fluorescent, mercury vapour and incandescent

lamps.

Specifications

<Operating Voltage Range:

24Vdc nominal: 10.5 to 32Vdc

If a fuse is rated in line with the main power supply, it should be a 1A slow-blow type. If a power

supply with current limiting is used it should have a rating appropriate for the inrush current

required by the product.

<Power Consumption (UVU-140-A):

1.92 Watts nominal 2.4 Watts maximum @ 24Vdc

80mA nominal 100mA maximum @ 24Vdc

Inrush Current 250 mA for 2.5 ms

<Power Consumption (UVU-140-AR):

2.4 Watts nominal (fault relay energized) @ 24Vdc

2.9 Watts maximum (fire & fault relays energized) @ 24Vdc

100mA nominal @ 24Vdc 120mA maximum @ 24Vdc

Inrush Current 380 mA for 2.5 ms

<Temperature Range:

Operating: -40ºC to +85ºC (-40/F to +185/F)

Storage: -55ºC to +125ºC (-67/F to +257/F)

<Dimensions:

Refer to Figures 4, 5, 6 and 7

<Detector Enclosure Materials:

NEMA 4X anodized copper-free aluminum or stainless steel (optional)

<Shipping Weight (approximate):

2 lbs (0.9 kilograms) aluminum

<Certification:

CSA, NRTL/C, NEMA 4X certified for hazardous locations

Class 1, Division 1, Groups B, C and D

IEC approval Ex d IIB+H2 T5 (Class 1, Zone 1, Groups IIB+H2 T5)

<Spectral Sensitivity Range:

The detectors respond to UV radiation over the range of 185 to 260 nanometres

(1850 to 2600 angstroms)

<Cone of Vision:

120 degree cone of vision when measured in accordance with NFPA 72 guidelines

<Current Outputs:

4-20mA DC into a maximum external loop resistance of 600 Ohms at 10.5 to 32Vdc

<Relay Contacts: (Available on UVU-140-AR only)

1A @ 30Vdc 0.5A @ 125Vac

<Response Time:

Response to a saturating (high intensity) UV source is typically 10 milliseconds

Alarm response time is programmable

<Time Delay Settings:

DIP switch selectable 3, 4, 5 or 7 seconds

<Sensitivity Settings:

DIP switch selectable 8, 16, 24 or 32 counts per second

<Humidity Range:

0 to 100% relative humidity

Applications

The UVU-140-A & UVU-140-AR fire detectors respond instantly to ultraviolet radiation emitted by a flame.

These devices are designed for use in hazardous locations and are suitable for use in outdoor applications.

Typical applications for UV detection systems

<around highly combustible materials

<when instantaneous response to flame is needed or where automated fire protection is required

<protection of large capital investments

Petroleum Products Handling

<petroleum loading terminals

<offshore platforms

<pipeline stations

<tank farms

<refineries

<engine rooms

Gaseous Fuel Handling

<butane and propane loading and storage

<pipeline compressor stations

<gas gathering facilities

<LNG loading, transfer and storage

<hydrogen

<gas turbines

Other Processes

<paint spray booths

<chemical and petrochemical production

<powder coating booths

Automated fire protection systems also have applications in any manufacturing or research facility where the

potential of fire may be low to moderate, but the losses due to a fire would be high.

Figure 2 - Detector cone of vision

CHAPTER 2 INSTALLATION

What’s in the package

Remove all the components from the packing box(s) carefully; check components against the packing list. Inspect

all components for obvious damage and broken/loose parts. Notify the carrier and distributor immediately if

damage is found or parts are missing.

Mounting the Detector

There are many factors that you should be aware of when positioning your fire detector(s).

Cone of vision

The UVU-140-A & UVU-140-AR fire detectors have a nominal 120 degree cone of vision when measured in

accordance to NFPA 72 guidelines. Figure 2 shows the cone of vision and detector response to a UV source at

various distances.

Range

The practical application distance is up to about 80 feet (25 metres). The distance is directly related to the

intensity of the ultraviolet radiation source. Programming the UVU-140-A & UVU-140-AR fire detectors to

require a high count rate results in low system sensitivity.

Environmental Factors

Airborne contamination such as steam , oil mist, ice build up and smoke can impair the detection capabilities of

UV fire detectors and should be avoided.

Since the UVU -140-A & UVU-140-AR fire detectors are designed to detect fires by responding to the ultra-

violet (UV) radiation they emit, it is very important to be aware of UV absorbing gases that may be present

between the detector and the sources of potential fires. Small concentrations of these types of gases may not

absorb enough UV radiation to cause a problem, but when higher concentrations of these gases are present the

detectors may become blind as not enough ultra-violet radiation can reach them to activate an alarm. Moving

detectors closer to the probable source of fire and increasing the sensitivity of the detector can help to overcome

this problem in some cases. For a list of some common UV absorbing chemical vapours see Appendix B.

False Alarms

Arc Welding, long duration lightning flashes, cracked mercury lamps, cracked halogen lamps, and X-rays may

cause false alarms and should be avoided.

NOTE:

Ultraviolet detectors are sensitive to arc welding and if this type of radiation can be expected, nuisance

alarms must be controlled through proper application including careful positioning and shielding of

the detectors. Some applications may require a UV/IR system.

CAUTION:

Caution must be exercised if the detection system is turned off, as the hazardous area will not be

protected. .

Lightning strikes can trigger the detector but this can be solved by pointing the sensor cone of vision below the

horizon and setting the time delay to 7 seconds.

Cracked mercury or halogen lamps in the vicinity of the fire detector should be replaced as soon as they are

discovered.

UV radiation other than that produced by an actual fire is referred to as “background UV”. An example of a high

level of background UV could be a flare stack situated outside of a building. The UV radiation produced by this

flare may be detected when a door to the building is opened. Windows or other reflective surfaces may also cause

unusually high levels of UV radiation to enter the building from the flare. In a situation like this, the fire

detection system response must be carefully checked and the sensitivity level adjusted high enough, so that this

“background UV” will not cause false alarms.

UV fire detectors respond to radiation other than ultraviolet. X-rays can activate the detector and are often used

in industrial inspection. It may be necessary to disable the system when X-ray is conducted nearby.

Position and Density of Detectors

The UVU-140-A & UVU-140-AR fire detectors have a nominal 120 degree cone of vision when measured in

accordance to NFPA 72 guidelines. In an application such as a loading dock with a ceiling height of 25 feet (7.5

metres) where it is desired to have complete detector coverage at floor level and a detector is mounted 2 feet (0.6

metres) from the ceiling and pointed straight down, the distance from the detector to the designated level would

be 23 feet (7 metres). The detector has a 120 degree cone of vision and would cover a circular area 80 feet (24

metres) in diameter at floor level. A sketch of the area to be covered will indicate the number of detectors

required to monitor the area. Detectors should be placed as close as practical to the expected fire hazard.

NOTE:

Do not mount UV detectors close to the ceiling of enclosed buildings if smoke might accumulate

before the break-out of flame. It is preferable to mount the detectors on walls a few feet (about 1

Figure 3 - Detector with Swivel Mount

metre) below the ceiling where they may respond before being obscured by smoke. Consider

shortening time delay settings when smoke is expected to accumulate during a fire. If dense smoke is

likely to accumulate prior to flame (as in an electrical fire), supplement UV detectors with other

protection.

The detector should be mounted in a low vibration area be easy to access for cleaning purposes and should not

have glass or plexiglass windows between the device and the potential fire. Locate detectors to ensure an

unobstructed view of the area to be monitored. To minimize dirt accumulation around the vi surfaces, mount the

detectors so that the internal vi source tube is on top. The silver external reflector should be placed directly

over the vi source tube. Refer to Figures 4 and 5 for the detector and swivel mount dimensions. Refer to Figure

3for a diagram of the assembled detector and swivel mount assembly.

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