Unitized
Infrared
Flame Detector
User Manual
Model:
IRS-A or AR
Part Number: MAN-0038-00 Rev 8
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
Immune ............................................................................................................ 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 ............................................................................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
Figure 6: Stainless Steel Junction Box Connection - Analog/Relay.........................7
Detector Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Table 3: Closing the Housing ............................................................... ....................8
Relay Settings ...................................................................................................9
Coil and Latch Status .............................................................................................9
Table 4: Relay Setting (Junction Box) .....................................................................9
Remote Reset-Relay Only ...............................................................................9
Final Setup ........................................... ..................................................................9
Detector Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Detector Window .............................................................................................9
Figure 8: Detector Viewing Window .......................................................................9
Start up Procedure ............................................................................................9
System Check ...................................................................................... ................10
Monitor ...........................................................................................................10
Condition Status—LEDs ..................................................................... ................10
Condition Status—Current Output ................................................................10
Table 5: Status LEDs and Current Output ..............................................................10
Detector Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Testing ............................................................................................................11
Manual Check Procedure ....................................................................................11
Automatic Visual Integrity (VI) Test ..................................................................11
Manual VI Test ....................................................................................................11
Cleaning Window and Reflector ....................................................................12
O-ring ...................................................................................................................12
How to Return Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Troubleshoot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 6: Possible Problems and Solutions ..............................................................13
Appendix A: Electrostatic Sensitive Device (ESD) ........................14
Appendix B: Resistance Table (Ohms) ...........................................15
Appendix C: Specification ................................................................16
Appendix D: Response Testing ........................................................17
System Sensitivity ........................................................................................... 8
DIP Switch Access ................................................................................................8
Figure 7: DIP Switch Location ................................................................................8
Sensitivity Setting ..................................................... .......................................8
Time Delay Setting ..........................................................................................8
Table 2: Sensitivity and Time Delay Settings (Sensor Module) .............................. 8
Net Safety Monitoring Inc
INTRODUCTION
The IRS is a smart, stand-alone infrared flame detector. The detector is designed
to respond to IR radiation emitted by a wide range of hydrocarbon based fires. It
is ideal for both indoor and outdoor applications and has been proven reliable in
even the most extreme environments.
Spectral Sensitivity Range
The IRS fire detector responds to IR radiation in the 4.4 micron range.
100
Radiation
reach the
earth (%)
Locate Detector
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.
75
50
25
0
0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0
Solar
Radiation
Infrared
Detector Range
Potential ignition sources
A hydrocarbon fuel-based fire can erupt in areas where the following are found:
• 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 IRS from detecting a fire or reduce its
sensitivity to fire. Possible inhibitors include but are not limited to solid objects
such as machinery, glass or plexiglass located between the detector and
potential fire source.
And, although the IRS is quite tolerant of airborne contaminants, water, fog,
rain, dirt or dust on the detector window or heavy smoke between the detector
and potential fire source can influence the IRS sensor.
Immune
The IRS exhibits excellent immunity to many conditions/activities including but
not limited to the following:
• steady hot body radiation • artificial lighting • x-rays
• sunlight (direct/reflected) • arc welding radiation (outside 30 feet/9 metres)
Typical applications
• automotive-manufacturing and paint 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 (floating/ non-floating)
• power generation pumps, generators and unmanned stations
IRS-A or AR 1
Net Safety Monitoring Inc.
RANGE
The practical application distance is directly related to the intensity of the
infrared radiation source.
Table 1: Summary of Distances
Fuel Size Distance
n-heptane 1’ x 1’ 80 feet
gasoline 1’ x 1’ 80 feet
methanol 1’ x 1’ 60 feet
diesel 1’ x 1’ 50 feet
JP-4 1’ x 1’ 50 feet
lube oil 1 ’ x 1’ 40 feet
propane 16” flame 25 feet
paper 2’ x 2’ 90 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 90 degrees vertical and 90
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 than 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 IR 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 8).
• Reduce sensitivity setting if false alarms, related to surrounding activities,
occur (refer to "System Sensitivity" on page 8).
• If a detector is located close to an intense, flickering IR source, the detector’s
sensitivity may be affected.
• 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.
° to reduce dirt and dust
IRS-A or AR 2
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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
Viewing Window
Detector Housing
Flexible
Cable
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
Tighten t o
secure position
Adjustable Swivel
Mounting flange
Mounting Flange
Swivel Mount
1.015”
4.00”
2.5” diameter
Note: Units are factory sealed.
2.030”
IRS-A or AR 3
Net Safety Monitoring Inc.
Positioning
Ensure the external gold VI reflector is placed directly over the VI Emitter
(refer to Figure 8, "Detector Viewing Window", on page 9 for VI source
location). Also ensure the detector is mounted with the VI reflector in the TOP
position, centred over the yellow dot.
Figure 3: Position of VI Reflector
Centre Line
VI Emitter
Gold VI Reflector
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 AWG rated 300 V for distances up to 150 feet. When 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 B, " Resistance
Table (Ohms)", on page 15.
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
Yellow Dot
IRS-A or AR 4
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'.
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CONNECTING
There are two configurations of the IRS 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 11)
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 (+)
IRS
Test Jacks (refer to "Condition Status—Current Output" on
page 10) for details
4Blue
Detector
Wire
Function
System
Common (-)
Manual VI
(optional)
IRS-A or AR 5
Net Safety Monitoring Inc.
Figure 5: Junction Box Connection — ANALOG/RELAY
NO Normally Open
NC Normally Closed
COM 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
Fault Relay
Earth Ground
SIGNAL INPUT
Blue B
Red R
Black BLK
IRS
White W 11.0-32 V dc (+)
Green Earth Ground
DIP Switch refer to "Relay Settings" on page 9 for details
Manual VI
(optional)
4-20 mA Signal
Output
System
Common (-)
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.
WARNING:
Net Safety manufactures two different Relay junction boxes. If you have the stainless steel model (JB-F-R-SS), then refer to Figure 6, "Stainless S teel
Junction Box Connection (JB-F-R-SS)— Analog/Relay" on page 7.
IRS-A or AR 6
Net Safety Monitoring Inc.
Figure 6: Stainless Steel Junction Box Connection (JB-F-R-SS)— ANALOG/RELAY
NO Normally Open
NC Normally Closed
COM 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
G
B
R
BLK
W
Shield to
Earth Ground
Power Supply
Fault Relay
Earth Ground
SIGNAL INPUT
Green G Earth Ground
OFF
ON
Blue B
Red R
IRS
Black BLK
White W 11.0-32 V dc (+)
DIP Switch refer to "Relay Settings" on page 9 for details
Manual VI
(optional)
4-20 mA Signal
Output
System
Common (-)
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 inpu t p ower (-PWR) on the Signal
Output terminal block.
WARNING:
Net Safety manufactures two different Relay junction boxes. If you do not have the stainless steel model (JB-F-R-SS), then refer to Figure 5, "Junction
Box Connection — Analog/Relay" on page 6.
IRS-A or AR 7
Net Safety Monitoring Inc.
DETECTOR SETUP
SYSTEM SENSITIVITY
The IRS fire detector can be adjusted to a high or low sensitivity level. The level
is dependent upon the intensity of the infrared 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
DIP Switches are used to set the detector’s sensitivity and time delay settings.
The DIP Switches are located on the internal Sensor module of the IRS.
Note: DIP Switch Position 1 is NOT used on the Sensor module.
1. Unscrew the Housing Top counter clockwise.
2. Slide a DIP Switch to the ON or OFF position. Refer to Figure 7, "DIP Switch Location", on page 8 and Table 2, "Sensitivity and Time Delay Settings (Sensor Module)", on page 8 for DIP Switch positioning instructions.
Figure 7: DIP Switch Location
Housing Base
Sensor Module
Housing Top
WARNING:
Switches (see Appendix A, " Electrostatic Sensitive Device (ESD)", on
page 14).
Sensitivity Setting
The adjustable Sensitivity setting is used to optimize the IRS for various
installations.
When selecting High or Low sensitivity, consider the following points:
- Size of potential fire
- Distance between possible fire and detector
- Type of flammable substance to be detected
- Environmental factors
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)
Low n/a ON 3 seconds ON ON
High n/a OFF 4 seconds ON OFF
Do not touch internal components other than the DIP
Sensitivity Time Delay
Position 1 Position 2 Position 3 Position 4
5 seconds OFF ON
7 seconds OFF OFF
Note: Default settings are High Sensitivity and a 5 second Time Delay.
Closing the Housing
DIP Switch
IRS-A or AR 8
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 yellow
dot (refer to "Positioning" on page 4 for details).
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RELAY SETTINGS
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-Relay Only
The IRS 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" on page 9). To
reset the latched alarm the terminals marked R.Rst and -PWR on the Junction
Box (Relay only) must be momentarily connected.
Position 1 Position 2
DETECTOR FUNCTIONALITY
DETECTOR WINDOW
Figure 8: Detector Viewing Window
CENTRE LINE
Gold VI Reflector
Yell ow Dot
IR Emitter
IR Sensor
Green LED
Final Setup
• Ensure all internal settings complete
• Securely close Housing
• Ensure reflector positioned over the Yellow Dot
• Clean detector lens
• Mount and align detector
IRS-A or AR 9
START UP PROCEDURE
Once powered up, the IRS will begin a 90 second start up routine. During this
time, the current output will be 3 mA and the Green power LED will be on.
Once the start up procedure has finished, and no faults are present, the detector
will begin Normal operation (current output 4 mA and Green LED will remain
on).
Red LED
Yellow LED
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System Check
Once powered up the system should be checked. Refer to the section entitled
"Manual Check Procedure " on page 11 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 loop and/or
the condition LEDs.
Condition Status—LEDs
There are three (3) LEDs used to indicate the status of the detector (refer to
Table 4, "Status LEDs and Current Output", on page 10).
Condition Status—Current Output
The Current Loop status can also be 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.
Table 4: Status LEDs and Current Output
LED Status
Internal Power Fault or
system power out of range
Automatic or manual VI Test
Failure
Power up 90 second start delay
Normal Operation 4 mA Solid off off
Background IR source 8 mA Solid off off
Manual VI Testing Adequate 10 mA Solid Solid off
Manual VI Testing Good 11 mA Solid Solid off
Manual VI Testing Excellent 12 mA Solid Solid off
Early Warning - Intermittent
IR detected
Fire confirmed 20 mA Solid Flashing off
Current
O/P
1 mA off off Solid
2 mA off off Flashing
3 mA Solid off off
16 mA Solid off off
Green
LED
(Power)
Red LED
(Alarm)
Yellow
LED
(Fault)
Also, the detector can be monitored using the 4-20 mA Signal Output.
Refer to the section entitled "Connecting" on page 5 for details.
IRS-A or AR 10
Net Safety Monitoring Inc
DETECTOR MAINTENANCE
The IRS 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 amoun t 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 an Net Safety IR 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 IR test lamp into the detector viewing window. The current output will change with the amount of radiation being detected and the Red LED will flash (refer to "Status LEDs and Current Output" on page 10).
2. Turn off the IR 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 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,
the Yellow LED will Flash and O/P drop 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 12) or the obstruction remove. Also refer to Table 5,
“Possible Problems and Solutions,” on page 13.
If the obstruction was only temporary, the detector will return to normal
operation with the next VI test.
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 IRS-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. The Red
LED will be activated for the duration of the test.
3. Two seconds after the test has commenced, the detector will output a
current that corresponds to the quality of the VI reading obtained (see
Table 4, "Status LEDs and Current Output", on page 10).
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 and the Yellow
LED will flash.
The detector will stay in the manual VI test mode as long as
IRS-A or AR 11
Net Safety Monitoring Inc.
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 or film that can block IR radiation.
To minimize dirt accumulation around the VI surface, a product such as Net
Safety’s Air Shield 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 present 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
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
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.
IRS-A or AR 12
Net Safety Monitoring Inc.
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 Solid
2 mA Flashing VI (visual integrity) fault
8 mA Solid Background IR source
10 mA Solid Solid Manual VI test (adequate) Clean all optical surfaces (use Net Safety Monitoring Lens clea ner only)
11 mA Solid Solid Manual VI test (good) No action required, optics are moderately clean
12 mA Solid Solid Manual VI test (excellent) No action required, all optical surfaces are perfectly clean
Green
LED
Yellow
LED
Solid/
off
Red
LED
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 PCB) (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 IR source bulb
If not using 4-20 output ensure jumper is in correct position ("Junction Box
Connection — Analog/Relay" on page 6)
Confirm external IR source by covering detector window so it is blind to all radiation.
- If signal goes away , background IR is present. Field of View should be cleared of IR
sources/activities (i.e., hot bodied sources like manifolds, heaters, etc); realign
detector coverage area; redefine Time Delay; reset Sensitivity setting.
- If signal persists, electrical wiring or detector electronics may be at fault
IRS-A or AR 13
Net Safety Monitoring Inc.
Appendix A:
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
IRS-A or AR 14
Net Safety Monitoring Inc.
Appendix B: 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.
IRS-A or AR 15
Net Safety Monitoring Inc.
Appendix C: SPECIFICATION
IRS IRS-A (Analog) IRS-AR (Analog/Relay)
Operating Voltage 11.0 to 32.0 V dc
Power Consumption (at 24 V dc)
Inrush Current 600 mA for 2.5 ms 800 mA for 2.5 ms
Operating Temperature -40°C to +75°C (-40F to +167F) certified/ -50°C to +75°C (-58F to +167F)operational
Field of View 90 degrees horizontal / 90 degrees vertical
Spectral Range IR radiation in the 4.4 micron range
Time Delay DIP switch selectable 3, 4, 5, 7 seconds
Sensitivity Settings DIP switch selectable High and Low
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 (Stainless Steel Option 3.4 Kg/7.5 lbs)
Certification
Current Output
Nominal 70 mA/1.7 W
Maximum 120 mA/2.9 W
CSA and NRTL/C certified for hazardous locations. Class I, Division 1, Groups B, C and D. Temperature code T5.
Enclosure type NEMA 4X. IEC Rating Ex d IIB+H2 T5.
CE Ex II 2 G, Ex d II B+H2 T5
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 90 mA/2.2 W
Maximum 135 mA/3.3 W
Form C contacts rated 1 Amp @ 30 V dc, 0.5 Amp @
Relay Output
Note: Units are factory sealed.
IRS-A or AR 16
125 V ac. Selectable energized/de-energized, latching/
non-latching Fire relay. Fault relay fixed as energized/
non-latching.
Net Safety Monitoring Inc
Appendix D: RESPONSE TESTING
Fuel Size Distance Notes
Detector Range Response
(high sensitivity)
Typical Response Time
False Stimuli Response
n-heptane
gasoline
methanol
diesel
JP-4
lube oil
propane
paper (crumpled newspaper 10” high)
Response time for the IRS fire detector is as little as 6 seconds, with a mean response time of
8 seconds depending on conditions such as wind, temperature, smoke and so on.
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’
1’ x 1’
1’ x 1’
1’ x 1’
16” plume
2’ x 2’
Immunity
Distance
2 feet
--
-20 feet
10 feet
25 feet
25 feet
30 feet
80 feet
80 feet
60 feet
50 feet
50 feet
40 feet
25 feet
90 feet
Response
No Alarm AAR
full burn
full burn
full burn
Flame Source
2” methanol
Note: AAR = Accurate alarm response
IRS-A or AR 17
N
2
C
T
E
w
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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