Rosemount Manual: UVU-120-A-H2 or AR-H2 Unitized UV Hydrogen Fire Detector | Rosemount Manuals & Guides

Unitized

Ultraviolet

High Sensitivity

Flame Detector

User Manual

Model:

UVU-120-A-H2 or AR-H2

Part Number: MAN-0067-00 Rev 3

May 2006

Net Safety Monitoring Inc

IMPORTANT INFORMATION

This manual is for informational purposes only. Although every effort has been
made to ensure the correctness of the information, technical inaccuracies may
occur and periodic changes may be made without notice. Net Safety Monitoring
Inc., assumes no responsibility for any errors contained within this manual.

If the products 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.

Warranty

Net Safety Monitoring Inc., warrants its sensors against defective parts and
workmanship for a period of 24 months from date of purchase; 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 representative for details.
We welcome your input at Net Safety Monitoring. If you have any comments

please contact us at the phone/address below or visit our web site and complete
our on-line customer survey: www.net-safety.com.

Contact Information

Net Safety Monitoring Inc.
2721 Hopewell Place NE
Calgary , AB
Canada
T1Y 7J7
Telephone: [phone] Fax: [phone]
www.net-safety.com
E-mail: [e-mail]

Copyright © 2003 Net Safety Monitoring Inc.
Printed in Canada

Net Safety Monitoring Inc

TABLE OF CONTENTS

Important Information

Warranty
Contact Information

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

Spectral Sensitivity Range .................................. ..................................................1

Locate Detector .....................................................................................................1

Typical applications .........................................................................................1

Potential ignition sources ................................................................................1

Potential inhibitors ...........................................................................................1

Absorbing Gases .............................................................................................. 1

Field of View..........................................................................................................2

Effective Field of View....................................................................................2

Range ............................................................................................................... 2

Table 1: Summary of Distances ...............................................................................2

Field of View .........................................................................................................2

Installation Considerations ....................................................................................2

Unpack ............................................................................................................. 3

Figure 1: Detector Housing and Swivel Mount .......................................................3

Figure 2: Dimensional Drawing ...............................................................................3

Positioning ............................................................................................................. 4

Figure 3: Position of VI Reflector/Emitter ...............................................................4

Field Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Wiring .............................................................................................................. 4

Grounding ..............................................................................................................4

Sealing ............................................................................................................. 4

Connecting ....................................................................................................... 5

Figure 4: Junction Box Connection — Analog ........................................................5

Figure 5: Junction Box Connection — Analog/Relay .............................................6

Detector Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

System Sensitivity ........................................................................................... 7

DIP Switch Access (Detector Head) .....................................................................7

Figure 6: DIP Switch Location ................................................................................7

Sensitivity Setting ..................................................... .......................................7

Time Delay Setting ..........................................................................................7

Table 2: Sensitivity and Time Delay Settings (Sensor Module) .............................. 7

Closing the Housing ........................................................................................ 7

Relay Settings (Junction Box) ..........................................................................8

Coil and Latch Status .............................................................................................8

Table 3: Relay Setting (Junction Box) .....................................................................8

Remote Reset ...................................................................................................8

Final Setup ........................................... ..................................................................8

Detector Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Detector Window .............................................................................................8

Figure 7: Detector Viewing Window .......................................................................8

Start up Procedure ............................................................................................8

System Check ...................................................................................... ..................9

Monitor .............................................................................................................9

Condition Status—Current Output ..................................................................9

Table 4: Condition Status—Current Output .............................................................9

Detector Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Testing ..............................................................................................................9

Manual Check Procedure ......................................................................................9

Automatic Visual Integrity (VI) Test ....................................................................9

VI Adjustment Screw ................................................................................. ....10

Manual VI Test ....................................................................................................10

Cleaning Window and Reflector ....................................................................10

O-ring ...................................................................................................................10

Troubleshoot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 5: Possible Problems and Solutions ..............................................................11

How to Return Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Appendix A: Common UV Absorbing Gases .................................12

Appendix B: Electrostatic Sensitive Device (ESD) ........................13

Appendix C: Resistance Table (Ohms) ...........................................14

Appendix D: Specification ................................................................15

Appendix E: Response Testing ........................................................16

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0

INTRODUCTION

The UVU-120-A/AR-H2 is a smart, stand-alone, high sensitivity ultra-violet
flame detector. The detector is especially designed to respond to UV radiation
emitted by hydrogen (H2) fires as well as various hydrocarbon based fires. The
UVU-120-A/AR-H2-H2 is ideal for a variety of applications and has been
proven reliable in even the most extreme environments.

Spectral Sensitivity Range

The UVU-120-A/AR-H2-H2 fire detector responds to UV radiation
wavelengths of 185 to 260 nanometres (1850 to 2600 angstroms). 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.

Relative Sensitivity

of Detector

Relative Sensitivity

of Light Source

(%)

100

50

0

100

Spectral
Response
of Detector

Sunlight

Gas Flame

200 300 400 500 600 700 800 900 100

Ultraviolet Range Visible Range

Tungsten Lamp

Infrared Range

Typical applications

• automotive-manufacturing and pain t spray booths

• aircraft hangars (commercial and military)

• offshore platforms, refineries, pipelines and production ships

• printing industry facilities

• oil, gas and petrochemical refineries/production/storage/off loading/shipping

• various production, processing and storage facilities

• munitions handling

• warehouses (flammable liquids/toxic gases) and tank farms (flo ating/non-floating)

• power generation pumps, generators and unmanned stations

Potential ignition sources

The UVU-120-A/AR-H2 was specifically designed to detect Hydrogen fires but
also detects metal based fires, sulphur fires and high-pressure Natural Gas fires
as well as the following hydrocarbon based fires:

• alcohol • acetylene • diesel and hydraulic fuel

• gasoline • natural gas • liquefied natural gas (LNG)

• paint • solvents • liquefied petroleum gas (LPG)

• aviation fuel • heptane/naptha • propane/methane/butane

Potential inhibitors

A potential inhibitor is anything located between the detector and a potential
fire source which could prevent the UVU-120-A/AR-H2 from detecting a fire or
reduce its sensitivity to a fire. Possible inhibitors include but are not limited to
the following:

• Solid objects such as machinery, glass or plexiglass between the detector and
potential fire source

• Water, fog, rain, dirt or dust on the detector window or heavy smoke between
the detector and potential fire source

Locate Detector

Absorbing Gases

A further potential inhibitor may be the presence of UV absorbing gases or

When positioning fire detectors, consider such factors as distance to the fire,
type of fuel and temperature as well as any environmental factors which may
influence the detector’s response to radiation.

chemical vapours between the detector and source of potential fire. Such gases
could impede the detector’s ability to detect a UV flame source. Small
concentrations of these gases may not be sufficient to obstruct the sensor but
high concentrations may impede the UV sensor. Moving the detectors closer to
the probable fire source and increasing the sensitivity can, in some
circumstances, overcome this issue (refer to Appendix A).

UVU-120-A-H2 or AR-H2 1

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Range

The practical application distance is directly related to the intensity of the ultra­violet radiation source.

Table 1: Summary of Distances

Fuel Size Distance

n-heptane 1’ x 1’ 50 feet
methanol 1’ x 1’ 40 feet
diesel 1’ x 1’ 40 feet
H2 16” plume 55 feet
JP-4 1’ x 1’ 50 feet
lube oil 1’ x 1’ 70 feet
propane 16” plume 120 feet
paper 2’ x 2’ 70 feet

Field of View (as per FM and NFPA definition)

The area in front of a flame detector, where a standardized flame can be
detected and which is specified by distance and angle off the central axis, is the
Field of View. The referenced flame is moved to 50% of the maximum on-axis
detection distance and then moved off-axis horizontally and vertically to the
limit of detection. These off-axis angle limits specify Field of View.

According to this definition the Field of View is 70 degrees vertical and 120
degrees horizontal.

Effective Field of View (up to 120 degrees)

There are numerous factors which contribute to the effective Field of View
including the reflected energy from a fire. Note that a flame can be detected well
beyond the specified Field of View if it is closer to the detector, if the flame
becomes larger, fuel composition changes, temperature shifts or other factors
lead to increased intensity of infrared energy reaching the detector.

Installation Considerations

The following should be considered when mounting flame detectors.

• Point detector toward where the flame is expected.

• Ensure an unobstructed view of the area to be monitored.

• Employ more then one detector to ensure the hazard is fully covered.

• Mount the detector a few feet (about 1 metre) below the ceiling so it can
respond before being blocked by smoke accumulation at the ceiling.

• If dense smoke is likely to accumulate prior to flame (as in an electrical fire),
supplement UV detector(s) with other protection such as Net Safety
Monitoring’s Airborne Particle Monitor.

• The detector should be accessible for cleaning the window and reflector
surfaces.

• Tilt detector downward a minimum of 10 to 20
accumulation which could obscure the detector’s viewing window.

• Securely mount detector so as to reduce vibration as much as possible.

• When located outside, detector sensitivity can be reduced by heavy fog, rain
and/or ice.

• Consider shortening the time delay settings when smoke is expected to
accumulate before or during a fire (refer to "System Sensitivity" on page 7).

• Reduce sensitivity setting if false alarms, related to surrounding activities,
occur (refer to "System Sensitivity" on page 7).

• When installed near or on water (such as an off shore platform), be sure to
take into account the low horizon level when tilting detector downward.

• 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 as fire 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.

° to reduce dirt and dust

UVU-120-A-H2 or AR-H2 2

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• UV fire detectors respond to radiation other than ultraviolet. X-rays can
activate the detector. Since X-rays are often used in industrial inspection it
may be necessary to disable the system when inspections are conducted
nearby.

UNPACK

Carefully remove all components from the packaging. Check components
against the enclosed packing list and inspect all components for obvious
damage such as broken or loose parts.

If you find any components missing or damaged, notify the representative or
Net Safety Monitoring immediately.

Figure 1: Detector Housing and Swivel Mount

Reflector Surface

Flexible
Cable

Viewing Window

Detector Housing

Figure 2: Dimensional Drawing

0.25”

2.50”

Fire Head

and

Swivel Mount

3/4” NPT

Junction Box

2.96”

3/4” NPT

5.89”

2.60”

4.12”

2.95”

4.850

4.00”

Adjustable Swivel

Tighten t o
secure position

Mounting flange

Mounting Flange
Swivel Mount

1.015”

2.5” diameter

Note: Units are factory sealed.

2.030”

UVU-120-A-H2 or AR-H2 3

Net Safety Monitoring Inc.

Positioning

Ensure the external silver Visual Integrity (VI) reflector is placed directly over
the VI Emitter (refer to Figure 7, "Detector V iewing W indow", on page 8 for VI
source location). Also ensure the detector is mounted with the VI reflector in the
top position.

Figure 3: Position of VI Reflector/Emitter

Reflector

VI Emitter

FIELD INSTALLATION

WARNING: Compliance with regulations is the responsibility of the

installer. Wiring must comply with applicable regulations relating to the
installation of electrical equipment in a hazardous area.

WIRING

The use of shielded cable run through conduit is highly recommended for power
input and signal wires to protect against interference caused by extraneous
electrical 'noise'. Recommended detector cable is four conductor (or greater),
shielded 18 A WG rated 300 V for distances up to 150 feet. When wiring cable is
installed in conduit, the conduit must not be used for wiring to other electrical
equipment. Detectors can be located over 150 feet and up to 2000 feet if 16
AWG shielded conductor is used. The maximum distance between the sensor
and controller is limited by the resistance of the connecting wiring, which is a
function of the gauge of the wire being used. Refer to Appendix C, " Resistance
Table (Ohms)".

Grounding

Proper shielding and grounding procedures, for the specific area of installation,
should always be followed.

SEALING

Water-proof and explosion-p roo f cond uit seals are recommended to prevent the
accumulation of moisture within the junction box. Seals should be located as
close to the device as possible and not more than 18 inches (46 cm) away.
Explosion-proof installations may require an additional seal where conduit
enters a non-hazardous area. When pouring a seal, use a fibre dam to ensure
proper formation of the seal. Seals should never be poured at temperatures
below freezing.

The jacket and shielding of the cable should be stripped back to permit the seal
to form around the individual wires. This will prevent air , gas and water leakage
through the inside of the shield and into the enclosure.

It is recommended that explosion-proof drains and conduit breathers be used.
Changes in temperature and barometric pressure can cause 'breathing' which
allows moist air to enter conduit. Joints are seldom enough to prevent
'breathing'.

UVU-120-A-H2 or AR-H2 4