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: (403) 219-0688 Fax: (403) 219-0694
www.net-safety.com
E-mail: netsafe@net-safety.com
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
Net Safety Monitoring Inc.
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
Net Safety Monitoring Inc
• 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
Net Safety Monitoring Inc.
CONNECTING
There are two configurations of the UVU-120-A/AR-H2 available: Analog (A) and Analog/Relay (A/R). Review the following figures for wiring and other settings
specific to the A or A/R board configurations.
WARNING:
Prior to wiring, ensure power is disconnected. Improper wiring can cause damage to the detector.
Figure 4: Junction Box Connection
Optional momentary push button switch for Manual
VI Test ("Manual VI Test" on page 10)
Terminal Marked Function
1 4-20 4-20 mA signal output
2 COM Input Power (Common)
3 +24 V +24 V dc input power
Optional Manual VI (if
4MVI
not used, leave
disconnected
— ANALOG
Shield
Earth Ground
Terminal
1 Red Signal Output
2Black
3 White 11.0-32 V dc (+)
UVU-120-A/AR-H2
Te st Jacks (refer to "Condition Status—Current Output" on
page 9) for details
UVS
4Blue
Detector
Wire
Function
System
Common (-)
Manual VI
(optional)
UVU-120-A-H2 or AR-H2 5
Net Safety Monitoring Inc.
Figure 5: Junction Box Connection — ANALOG/RELAY
Condition
No Fire COOC
FIre O C C O
Note: N=Normally / C=Closed / O=Open
Fire Relay Status
Normally
Energized
NO
Contact
NC
Contact
Normally
De-energized
NO
Contact
NC
Contact
Fault Relay
Earth Ground
SIGNAL INPUT
Blue B
Red R
Black
UVU-120-A/AR-H2
White W 11.0-32 V dc (+)
Green Earth Ground
DIP Switch refer to "Relay Settings (Junction
Box)" on page 8 for details
Manual VI
(optional)
4-20 mA Signal
Output
BLKSystem Common
(-)
SIGNAL OUTPUT
R Rst Optional Remote Reset
MVI Manual VI (optional)
SIG 4-20 mA signal output
-PWR -24 V dc input power
+PWR +24 V dc input power
Fire Relay
Cut Shield at
Junction Box
Shield to
Earth Ground
Power Supply
Note: If the 4-20 mA signal is not used, connect a jumper between the terminals for 4-20 mA signal output (SIG) and -24 V dc input power (-PWR) on the Signal
Output terminal block.
UVU-120-A-H2 or AR-H2 6
Net Safety Monitoring Inc
DETECTOR SETUP
SYSTEM SENSITIVITY
The UVU-120-A/AR-H2 fire detector can be adjusted to various sensitivity
levels by setting the detector to respond at a predetermined detector count rate.
The count rate is dependent upon the intensity of the ultraviolet radiation
reaching the detector, which in turn depends on the type of fuel, temperature,
flame size and distance of flame from the detector.
DIP Switch Access (Detector Head)
DIP Switches are used to set the detector’s sensitivity and time delay settings.
The DIP Switches are located on the Internal module of the UVU-120-A/ARH2.
1. Unscrew the Housing Top counter clockwise.
2. Slide a DIP Switch to the ON or OFF position. Refer to Figure 6, "DIP
Switch Location", on page 7 and Table 2, "Sensitivity and Time Delay
Settings (Sensor Module)", on page 7 for DIP Switch positioning
instructions.
Figure 6: DIP Switch Location
DIP Switch located on
underside
DIP Switch
label
VI Adjustment
Screw
WARNING:
Do not touch internal components other than the DIP
Switches (see Appendix B, " Electrostatic Sensitive Device (ESD)").
Sensitivity Setting
The adjustable Sensitivity setting is used to optimize the UVU-120-A/AR-H2
for various installations. In order to effectively detect Hydrogen fires, the UVU120-A/AR-H2 is set to the highest sensitivity.
Time Delay Setting
Defining the Time Delay allows the Fire alarm signal t o d elay (for the specified
time), before indicating an alarm. This feature can be beneficial depending upon
the conditions/activities surrounding the detector.
Table 2: Sensitivity and Time Delay Settings (Sensor Module)
Sensitivity Time Delay
Position 1 Position 2 Position 3 Position 4
8 counts CPS ON ON 3 seconds ON ON
16 counts CPS ON OFF 4 seconds ON OFF
24 counts CPS OFF ON 5 seconds OFF ON
32 counts CPS OFF OFF 7 seconds OFF OFF
Note: Default settings are Sensitivity set at 8 Counts Per Second (CPS) and a
5 second time delay.
Closing the Housing
When closing the Housing Cover, be sure that the top and bottom are screwed
together tightly.
TIP:
It is extremely important that the VI reflector is centred over the VI
emitter (refer to "Positioning" on page 4 for details).
Internal Module
Sensor Module
Housing Top
UVU-120-A-H2 or AR-H2 7
Net Safety Monitoring Inc.
RELAY SETTINGS (Junction Box)
Coil and Latch Status
The Junction Box (Relay only) has a two-position DIP Switch to define the Coil
and Latch Status for the Fire Relay. Refer to Figure 5, "Junction Box
Connection — Analog/Relay", on page 6 for DIP Switch location.
Note: The default Fire Relay is normally De-energized/Non-Latching.
The Fault Relay is factory set to normally Energized/Non-latching and
cannot be modified.
Table 3: Relay Setting (Junction Box)
Coil and Latch Status
Fire Relay
De-energized / Non-latching ON ON
Energized / Non-latching ON OFF
De-energized / Latching OFF ON
Energized / Latching OFF OFF
Remote Reset
The UVU-120-A/AR-H2 can be connected to allow for the Remote Reset of a
latched alarm. The Latch Status must be set to Latching (refer to "Relay Settings
(Junction Box)" on page 8). To reset the latched alarm the terminals marked
R.Rst and -PWR on the Junction Box (Relay only) must be momentarily
connected.
Final Setup
Position 1 Position 2
DETECTOR FUNCTIONALITY
DETECTOR WINDOW
Figure 7: Detector Viewing Window
VI Reflector
UV Emitter
UV Sensor
START UP PROCEDURE
Once powered up, the UVU-120-A/AR-H2 will begin Normal operation
(current output 4 mA).
• Ensure all internal settings complete
• Securely close Housing
• Ensure reflector positioned over emitter
• Clean detector lens
• Mount and align detector
UVU-120-A-H2 or AR-H2 8
Net Safety Monitoring Inc
System Check
Once powered up the system should be checked. Refer to the section entitled
"Manual Check Procedure " on page 9 for instructions.
WARNING: When testing the system, ensure all external equipment is
disabled to prevent unwanted activation during testing and enabled once testing
complete.
MONITOR
The Detector’s status can be determined by monitoring the current output.
Condition Status—Current Output
The Current Loop status is measured to determine detector condition.
T est Jacks are available on the Analog board in the Junction Box. The area must
be de-classified prior to opening the Junction Box.
Also, the detector can be monitored using the 4-20 mA Signal Output.
Refer to the section entitled "Connecting" on page 5 for wiring instructions.
Table 4: Condition Status
Status
Internal Power Fault or system power out of range 1 mA
—Current Output
Current
O/P
DETECTOR MAINTENANCE
The UVU-120-A/AR-H2 does not require calibration. Although an automatic
testing of the optics is done every 30 seconds, the system should be periodically
checked. To maintain maximum sensitivity, the viewing window and reflector
should be cleaned on a routine basis depending on the type and amount of
contaminants in the area.
TESTING
WARNING: When testing the system, ensure all external equipment is
disabled to prevent unwanted activation.
Manual Check Procedure
The whole system should be checked periodically with a Net Safety UV test
lamp to make sure that the detectors are not obstructed, that the area covered by
the detector has not changed and that there is no fault in the VI circuit.
1. Direct the UV test lamp into the detector viewing window. The current
output will change with the amount of radiation being detected (refer to
"Condition Status—Current Output" on page 9).
2. Turn off the UV test lamp and repeat steps 1 & 2 for all detectors in the system.
3. After all detectors have been checked, return the system to the normal operating mode and enable any external equipment.
Automatic or manual VI Test Failure 2 mA
Normal Operation 4 mA
Background UV source 6 mA
Manual VI Testing Adequate 10 mA
Manual VI Testing Good 11 mA
Manual VI Testing Excellent 12 mA
Early Warning - Intermittent UV detected 16 mA
Fire confirmed 20 mA
UVU-120-A-H2 or AR-H2 9
Automatic Visual Integrity (VI) Test
The detector performs an automatic Visual Integrity (VI) test every 30 seconds
during normal operation. If the automatic VI Test fails, three consecutive times,
current output drops to 2 mA indicating a dirty window, dirty reflector or failed
sensor. The detector will remain in this condition until the problem is corrected.
The detector window should be promptly cleaned (refer to "Cleaning Window
and Reflector" on page 10) or the obstruction removed. Also refer to Table 5,
“Possible Problems and Solutions,” on page 11.
If the obstruction was only temporary, the detector will return to normal
operation with the next VI test.
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VI Adjustment Screw
The VI adjustment screw (see Figure 6) controls the amount of light released
during VI testing. To increase the amount of light, open the orifice by turning
the screw counter-clockwise.
Manual VI Test
The test procedure can assist with maintenance planning. The Manual VI test
will return one of three current output responses depending upon the cleanliness
of the detector window and reflector.
- Adequate (10 mA) clean optical surfaces
- Good (11 mA) no action required - surface moderately clean
- Excellent (12 mA) no action required - surface perfectly clean
The detector has a manual VI input. The manual VI test is performed by:
• connecting Manual VI to system power by a direct connection OR
• connecting a momentary contact push button between system power and the
manual VI input OR
• using the Manual VI Test Button, located in the Analog Junction Box (area
MUST be de-classified prior to opening the Junction Box).
Note: The manual VI feature is optional on the UVU-120-A/AR-H2-A. If not
used, leave the manual VI input unconnected or tied to system common.
WARNING:
the manual VI input is held at the system power voltage. During the manual VI
test all other detector functions are disabled. It is therefore imperative that after
this test is performed the manual VI test input be released.
Test Procedure
1. Connect the manual VI test input terminal to system power by either a direct
connection or manual push button or use the Manual VI Test Push Button
(once area de-classified).
2. Hold the manual VI input at this voltage for at least two seconds.
3. Two seconds after the test has commenced, the detector will output a
current that corresponds to the quality of the VI reading obtained.
4. Release the manual VI test input. The detector will immediately return to
normal operation if a VI fault is not present.
5. If a VI fault is present, the current output will indicate 2 mA.
The detector will stay in the manual VI test mode as long as
CLEANING WINDOW AND REFLECTOR
When cleaning the window and reflector use the cloth and the cleaning solution
provided with the detector. Use only the provided cleaning solution as some
cleaners can leave a residue.
To minimize dirt accumulation around the VI surface, a product such as Net
Safety’s Air Shiel d should be purchased to minimize particulate build up on the
viewing window.
WARNING:
maintenance tasks and ensure all external equipment has been disconnected/
deactivated.
O-ring
The rubber o-ring on the detector housing is used to ensure the detector is
watertight. The housing should be opened periodically and the o-ring inspected
for breaks, cracks or dryness. To test the o-ring, remove it from the detector
housing and stretch it slightly. If cracks are visible, the o-ring should be
replaced. If it feels dry to the touch, a thin coating of lubricant should be applied
(such as polyalphaolefin grease). When re-installing the o-ring, be sure that it is
properly seated in the groove on the housing.
The o-ring must be properly installed and in good condition to prevent water
from entering the detector and causing failure. The life expectancy of rubber orings varies depending on the type and amount of contaminants prese nt in the
area. The person who maintains the system must rely on experience and
common sense to determine how frequently the rings should be inspected. A
coating of lubricant should also be applied to the enclosure threads before
reassembling the detector to help prevent moisture from entering.
Always bypass Alarm Output when performing
UVU-120-A-H2 or AR-H2 10
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TROUBLESHOOT
The occurrence of a false alarm may be due to various factors. In order to determine the source of a false alarm, keep accurate records of alarms including time, date,
weather conditions, activities in area, etc.
Consult the following table for possible solutions to false alarm conditions.
Table 5: Possible Problems and Solutions
False Alarm
Condition
Current O/P
0 mA
1 mA
2 mA VI (visual integrity) fault
6 mA Background UV source
10 mA Manual VI test (adequate) Clean all optical surfaces (use Net Safety Monitoring Lens cleaner only)
11 mA Manual VI test (good) No action required, optics are moderately clean
12 mA Manual VI test (excellent) No action required, all optical surfaces are perfectly clean
Possible Problem Possible Solution
Shorted signal Output
Loss of Power
Loose Wire(s)
Internal power fault
System power out of range
Check wiring
Check fuses (3 AMP fuse on bottom of internal electronics module) (any in-line
power fuse)
Check power source at unit
Check power supply (should be between 11.0-32 V dc)
Clean window (use Net Safety Monitoring Lens cleaner only)
Check for obstruction(s) within Field of View
Check reflector position and alignment
Check UV emitter
If not using 4-20 output ensure jumper is in correct position (Figure 5, "Junction Box
Connection — Analog/Relay", on page 6)
Confirm external UV source by covering detector window so it is blind to all
radiation.
- If signal goes away, background UV is present. Field of View should be cleared of
UV sources/activities (i.e., cracked lenses on sodium/mercury vapour bulbs, welding,
grinding, flare stacks, etc.); realign detector coverage area; redefine Time Delay; reset
Sensitivity setting.
- If signal persists, electrical wiring or detector electronics may be at fault
UVU-120-A-H2 or AR-H2 11
Net Safety Monitoring Inc.
HOW TO RETURN EQUIPMENT
A Material Return Authorization number is required in order to return
equipment. Please contact Net Safety Monitoring at (403) 219-0688
returning equipment or consult our Service Department to possibly avoid
returning equipment.
If you are required to return equipment, include the following information:
1. A Material Return Authorization number (provided over the phone to you
by Net Safety).
2. A detailed description of the problem. The more specific you are regarding
the problem, the quicker our Service department can determine and correct
the problem.
3. A company name, contact name and telephone number.
4. A Purchase Order, from your company, authorizing repairs or request for
quote.
5. Ship all equipment, prepaid to:
Net Safety Monitoring Inc
2721 Hopewell Place NE
Calgary, Alberta, Canada
T1Y 7J7
6. Mark all packages: RETURN for REPAIR
Waybills, for shipments from outside Canada, must state:
Equipment being returned for repair
All charges to be billed to the sender
Also, please ensure a duplicate copy of the packing slip is enclosed inside the
box indicating item 1-4 along with the courier and account number for returning
the goods.
before
Appendix A: COMMON UV ABSORBING
G
ASES
Since the UVU-120-A/AR-H2 fire detector is 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 ultraviolet 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.
The following is a list of common UV absorbing gases:
• Acetaldehyde
• Acetone
• Acrylonitrile
• Ethyl Acrylate
• Methyl Acrylate
•Ethanol
• Ammonia
• Aniline
•Benzene
•1, 3 Butadiene
• 2-Butanone
•Butylamine
• Chlorobenzene
• 1-Chloro-1Nitropropane
• Chloroprene
•Cumene
• Cyclopentadiene
• O-Dichlorobenzene
• P-Dichlorobenzene
• Methyl Methacrylate
• Alpha-Methylstyrene
• Naphthalene
• Nitroethane
• Nitrobenzene
• Nitromethane
• 1-Nitropropane
• 2-Nitropropane
• 2-Pentanone
• Phenol
• Phenyl Clycide Ether
• Pyridine
• Hydrogen Sulfide
•Styrene
• Tetrachloroethylene
• Toluene
• Trichloroethylene
• Vinyl Toluene
•Xylene
All Equipment must be Shipped prepaid. Collect shipments will not be
accepted.
Pack items to protect them from damage and use anti-static bags or aluminiumbacked cardboard as protection from electrostatic discharge.
UVU-120-A-H2 or AR-H2 12
Net Safety Monitoring Inc
Appendix B:
E
LECTROSTATIC SENSITIVE DEVICE (ESD)
Electrostatic discharge (ESD) is the transfer, between bodies, of an electrostatic
charge caused by direct contact or induced by an electrostatic field.
The most common cause of ESD is physical contact. Touching an object can
cause a discharge of electrostatic energy
occurs near electronic components, it can damage or destroy those components.
In some cases, damage is instantaneous and an immediate malfunction occurs.
However, symptoms are not always immediate
or seemingly normal for an indefinite period of time, followed by a sudden
failure.
To eliminate potential ESD damage, review the following guidelines:
—ESD! If the charge is sufficient and
—performance may be marginal
• Handle boards by metal shields
components
• Wear grounded wrist or foot straps, or ESD shoes or heel grounders to
dissipate unwanted static energy
• Prior to handling boards, dispel any charge in your body or equipment
• Ensure components are transported and stored in static safe packaging
• When returning boards, carefully package in the original carton and static
protective wrapping
• Ensure ALL personnel are educated and trained in ESD Control Procedures
In general, exercise accepted and proven precautions normally observed when
handling electrostatic sensitive devices.
A warning label is placed on the packaging, identifying product using
electrostatic sensitive semiconductor devices.
—taking care not to touch electronic
UVU-120-A-H2 or AR-H2 13
Net Safety Monitoring Inc.
Appendix C: RESISTANCE TABLE (OHMS)
Distance (Feet) AWG #20 AWG #18 AWG #16 AWG #14 AWG #12 AWG #10 AWG #8
100 1.020.640.400.250.160.100.06
200 2.031.280.800.510.320.200.13
300 3.051.921.200.760.480.300.19
400 4.062.551.611.010.640.400.25
500 5.083.202.011.260.790.500.31
600 6.093.832.411.520.950.600.38
700 7.11 4.47 2.81 1.77 1.11 0.70 0.44
800 8.12 5.11 3.21 2.02 1.27 0.80 0.50
900 9.145.753.612.271.430.900.57
1000 10.20 6.39 4.02 2.53 1 .59 1.09 0.63
1250 12.70 7.99 5.03 3.16 1 .99 1.25 0.79
1500 15.20 9.58 6.02 3.79 2 .38 1.50 0.94
1750 17.80 11.20 7.03 4.42 2.78 1.75 1.10
2000 20.30 12.80 8.03 5.05 3.18 2.00 1.26
2250 22.80 14.40 9.03 5.68 3.57 2.25 1.41
2500 25.40 16.00 10.00 6.31 3.97 2.50 1.57
3000 30.50 19.20 12.00 7.58 4.76 3.00 1.88
3500 35.50 22.40 14.10 8.84 5.56 3.50 2.21
4000 40.60 25.50 16.10 10.00 6.35 4.00 2.51
4500 45.70 28.70 18.10 11.40 7.15 4.50 2.82
5000 50.10 32.00 20.10 12.60 7.94 5.00 3.14
5500 55.80 35.10 22.10 13.91 8.73 5.50 3.46
6000 61.00 38.30 24.10 15.20 9.53 6.00 3.77
6500 66.00 41.50 26.10 16.40 10.30 6.50 4.08
7000 71.10 44.70 28.10 17.70 11.10 7.00 4.40
7500 76.10 47.90 30.10 19.00 12.00 7.49 4.71
8000 81.20 51.10 23.10 20.20 12.70 7.99 5.03
9000 91.40 57.50 36.10 22.70 14.30 8.99 5.65
10 000 102.00 63.90 40.20 25.30 15.90 9.99 6.28
Note: Resistance shown is one way. This figure should be doubled when determining closed loop resistance.
UVU-120-A-H2 or AR-H2 14
Net Safety Monitoring Inc.
Appendix D: SPECIFICATION
UVU-120-A/AR-H2 UVU-120-A-H2 (Analog) UVU-120-AR-H2 (Analog/Relay)
Operating Voltage 11.0 to 32.0 V dc
Power Consumption (at 24 V dc)
Inrush Current 250 mA for 2.5 ms 380 mA for 2.5 ms
Operating Temperature -40°C to +75°C (-40F to +167F)
Field of View 120 degrees horizontal / 70 degrees vertical
Spectral Range UV radiation over the range of 185 to 260 nanometres (1850 to 2600 angstroms)
Time Delay DIP switch selectable 3, 4, 5, 7 seconds
Sensitivity Settings DIP switch selectable 8, 16, 24 or 32 counts per seconds (Highest sensitivity, 8 cps for Hydrogen detection)
Enclosure Material Anodized Aluminum (optional stainless steel)
Humidity Range 0 to 100% relative humidity, non-condensing
Weight (with swivel) 2.1 Kg (4.5 lbs)
Certification
Current Output
Relay Output
Nominal 80 mA/1.7 W
Maximum 100 mA/1.92 W
CSA and NRTL/C certified for hazardous locations. Class I, Division 1, Groups B, C and D. Temperature code T4.
Enclosure type NEMA 4X. IEC Rating Ex d IIB+H2 T4.
Factory Mutual (FM) flame detector performance certification.
0 to 20 mA - Into a maximum loop impedance of 800 Ohms @ 32 V dc or 150 Oh ms @ 11.0 V dc. Non-isolated loop
supply.
Nominal 100 mA/2.4 W
Maximum 120 mA/2.9 W
Form C contacts rated 1 Amp @ 30 V dc, 0.5 Amp @
125 V ac. Selectable energized/de-energized, latching/
non-latching Fire relay. Fault relay fixed as energized/
non-latching.
Note: Units are factory sealed.
UVU-120-A-H2 or AR-H2 15
Net Safety Monitoring Inc.
Appendix E: RESPONSE TESTING
Fuel Size Distance Notes
Detector Range
(high sensitivity)
Typical Response Time
False Stimuli Response
n-heptane
methanol
diesel
H2
JP-4
lube oil
propane
paper (crumpled newspaper 10” high)
Response time for the UVU-120 fire detector is as little as 5 seconds, with a mean response time
of 7 seconds depending on conditions such as wind, temperature and smoke.
False Alarm Source
radio frequency interference
vibration
sunlight (direct/reflected)
1500 W heater (modulated/unmodulated)
250 W halogen light
incandescent light
fluorescent light
arc welding
1’ x 1’
1’ x 1’
1’ x 1’
16” plume
1’ x 1’
1’ x 1’
16” plume
2’ x 2’
Immunity
Distance
2 feet
--
-20 feet
10 feet
25 feet
25 feet
n/a
50 feet
40 feet
40 feet
55 feet
50 feet
70 feet
120 feet
70 feet
Response
No Alarm AAR
full burn
full burn
full burn
Flame Source
2” methanol
Note: AAR = Accurate alarm response
UVU-120-A-H2 or AR-H2 16
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Distributed by:
ww.netsafety.com
-mail: netsafe@net-safety.com
elephone: (403) 219-0688 Fax: (403) 219-0694
algary, Alberta, Canada T1Y 7J7
721 Hopewell Place NE
et Safety Monitoring Inc.,
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