Spectrex SharpEye 20/20U Operating instructions

UV Flame Detector
Model 20/20U, 20/20UB
User's and Maintenance Manual
TM20/20UB Rev E, August 2004
Factory Mutual Approved
Class I Div. 1 Groups B, C, D
Class II Div. 1 Groups E, F, G
ATEX Approved
Ex II 2G
EExd IIB + H2T5
EExde IIB + H2T5
218 Little Falls Rd., Cedar Grove, NJ 07009 USA;
Phone: [phone] Fax: [phone]
Web -Site: www.spectrex-inc.com ; Email: [e-mail]

The SharpEye Optical Flame Detector described in this document is the property
of Spectrex, Inc.
No part of the hardware, software or documentation may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any
language or computer language, in any form or by any means, without prior
written permission of Spectrex, Inc.
While great efforts have been made to assure the accuracy and clarity of this
document, Spectrex, Inc. assumes no liability resulting from any omissions in this
document, or from misuse of the information obtained herein. The information in
this document has been carefully checked and is believed to be entirely reliable
with all of the necessary information included. Spectrex Inc. reserves the right to
make changes to any products described herein to improve reliability, function, or
design, and reserves the right to revise this document and make changes from
time to time in content hereof with no obligation to notify any persons of revisions
or changes. Spectrex, Inc. does not assume any liability arising out of the
application or any use of any product or circuit described herein; neither does it
convey license under its patent rights or the rights of others.
Warning:
This manualshould be carefully read by all individuals who have or will have
responsibility for using, maintaining or servicing the product.
The Detector is not field-repairable due to the meticulous alignment and
calibration of the sensors and the respective circuits. Do not attempt to modify or
repair the internal circuits or change their settings, as this will impair the system's
performance and void the Spectrex, Inc. Product warranty.

Spectrex Inc. -SharpEye™UV Flame Detector Manual –TM 20/20UB Rev. E, August 2004
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TABLE OF CONTENTS
1.Scope.............................................................................................................................1
1.1 Product Overview..................................................................................................1
1.2 Document Overview..............................................................................................1
2. Technical Description..................................................................................................2
2.1 Principles Of Operation.........................................................................................2
2.2 The Sensing Element............................................................................................2
2.3 Detection Levels ....................................................................................................2
2.4 Alarm Signal Delay................................................................................................3
2.5 Built-In-Test (BIT) Capabilities.............................................................................3
2.6 Detector Structure .................................................................................................3
2.7 System Configuration............................................................................................3
2.8 Detector Types.......................................................................................................4
3.Performance.................................................................................................................6
3.1 Detection Sensitivity..............................................................................................6
3.2 Cone Of Vision.......................................................................................................7
3.3 False Alarms...........................................................................................................8
4.Operation.......................................................................................................................9
4.1 Visual Indications...................................................................................................9
4.2 Output Signals........................................................................................................9
4.3 Mode Selection....................................................................................................10
4.3.1 Function switch (SW1).................................................................................10
4.3.2 Alarm Delay Switch (SW2) –default 5 sec..............................................12
4.4 Detector States....................................................................................................13
4.5 Built-In-Test (refer to 2.5)..................................................................................14
5. Technical Specifications ...........................................................................................16
5.1 Electrical Specifications......................................................................................16
5.2 Mechanical Specifications ..................................................................................18
5.3 Environmental Specifications.............................................................................19
6. Installation Instructions .............................................................................................20
6.1 Introduction...........................................................................................................20
6.2 General Considerations......................................................................................20
6.3 Preparations For Installation..............................................................................21
6.4 Conduit Installation..............................................................................................21
6.5 Detector Mounting ...............................................................................................22
6.5.1 Swivel Mount Kit...........................................................................................22
6.5.2 Swivel installation (Figure 4a and 4b).......................................................22
6.6 Wiring (Refer to Fig. 5) .......................................................................................25
6.7 Terminal Wiring (Figures 6,7) ............................................................................26
6.8 Selection Of Operating Modes..........................................................................30
7. Operating Instructions ...............................................................................................31
7.1 Scope.....................................................................................................................31
7.2 Power-Up..............................................................................................................31
7.3 Reset.....................................................................................................................31
7.4 Functional Testing ...............................................................................................32

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7.5 Testing With Fire Simulator (See Appendix D)...............................................32
7.6 Safety Precautions ..............................................................................................33
8. Maintenance Instructions..........................................................................................34
8.1 Scope.....................................................................................................................34
8.2 Maintenance Instrumentation And Personnel.................................................34
8.3 Preventive Maintenance Procedures ...............................................................34
8.4 Periodic Maintenance Procedures....................................................................34
8.4.1 Power Up Procedure...................................................................................34
8.4.2 Functional Test Procedure..........................................................................34
8.5 Maintenance Records.........................................................................................35
8.6 Troubleshooting...................................................................................................35
8.6.1 Fault Indication.............................................................................................35
8.6.2 False Alarm or Warning Indication............................................................35
Appendix A -Wire Selection Tables............................................................................37
Appendix B. Typical Wiring Configurations................................................................39
Appendix C. Mounting the “EExde approved” version.............................................41
Appendix D. Long Range UV/IR Fire Simulator........................................................45

Spectrex Inc. -SharpEye™UV Flame Detector Manual –TM 20/20UB Rev. E, August 2004
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LIST OF FIGURES
Figure 1. Flame Detector Assembly -Outline Drawing.....................................................4
Figure 2. Flame Detector Assembly -Schematic Section ...................................................5
Figure 3. Horizontal and Vertical Fields of View.............................................................. 7
Figure 4.a. UV Detector and Swivel Mount Assembly..................................................... 23
Figure 4.b. Swivel Mount Assembly.................................................................................. 24
Figure 5. UV Flame Detector with Cover Removed......................................................... 27
Figure 6. Terminal Board Configuration ......................................................................... 28
Figure 7. Flame Detector Assembly -Wiring Diagram ................................................... 29
Figure 8. Typical Wiring Diagram for Four-Wire Controller ......................................... 39
Figure 9. Wiring Diagram for 4-20mA............................................................................. 39
Figure 10: Flame Detector Assembly -Wiring Diagram ................................................. 43
Figure 11: OPTION A Flame Detector Assembly -Wiring Diagram (“de version”)..... 44
Figure 12: OPTION B Flame Detector Assembly -Wiring Diagram (“de version”)..... 44
Figure 13: Fire Simulator.................................................................................................45
Figure 14: UV Detector Target Point............................................................................... 46
LIST OF TABLES
Table 1. Response Sensitivity Ranges .................................................................................6
Table 2. Immunity to False Alarm Faults...........................................................................8
Table 3. LED indications within different detector states..................................................9
Table 4. Function Switch SW1 .......................................................................................... 10
Table 5. SW2 Alarm Delay Setting ................................................................................... 12
Table 6. Output Signals Versus Detector State.................................................................13
Table 7. Dry Contacts Relays Ratings.............................................................................. 17
Table 8: Mounting according to US Version .................................................................... 22
Table 9: Mounting according to EU Version ................................................................... 22
Table 10. Maximum DC resistance at 68°F for copper wire............................................ 37
Table 11. Wiring length in feet (meter)............................................................................. 37
Table 12. Terminals wiring options of the detector.......................................................... 44

Spectrex Inc. -SharpEye™UV Flame Detector Manual –TM 20/20UB Rev. E, August 2004
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Spectrex Inc. -SharpEye™UV Flame Detector Manual –TM 20/20UB Rev. E, August 2004
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1. Scope
1.1 Product Overview
The Spectrex Model 20/20U, 20/20UB is a UV Flame Detector. It is designed to
sense the occurrence of fire and flames and subsequently activate an alarm or
an extinguishing system directly or through a control circuit for maximum fire
protection. It uses innovative technology of advanced digital signal processing to
analyze the dynamic characteristics of fire.
The Difference between models is that Model 20/20UB includes a Built-In-Test
(BIT) function while the 20/20U does not include the BIT.
Detection performance is controlled by a microprocessor and easily adapted to
all environments, applications and requirements. The result is a unique and
superior flame detector that provides excellent detection sensitivity with extreme
immunity to false alarm.
1.2 Document Overview
This manual describes the detector and its features. It describes instructions on
the installation, operation and maintenance.
This manual is divided into several parts. Each part is contained in a separate
chapter as follows:
Chapter 1. Scope. A general introduction and overview of the product and
the Manual, with a brief description of its content.
Chapter 2. Technical Description-the detector’s theory of operation.
Chapter 3. Performance-the detector features and capabilities.
Chapter 4. Operationdescribes the detector’s operation modes, user
interface and indications.
Chapter 5. Technical Specifications lists the Detector’s electrical,
mechanicaland environmentalspecifications.
Chapter 6. InstallationInstructions addresses thedetector’s proper
installation, including wiring and mode setting.
Chapter 7. Operating Instructionsaddresses operation instructions and
power-up procedures.
Chapter 8. Maintenance Instructions addresses maintenance instructions
and support procedures.
Appendix A. Wiring Selection Tablescontains tables for electrical wire
selection according to installation configuration.
Appendix B. Typical Wiring Configurations provides wiring diagrams for
installation.
Appendix C. Mounting the “EExde approved” version
Appendix D. Long Range UV/IR Fire Simulator

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2. Technical Description
•DetectionRange: Up to 50 ft (15m) for a 1ft x 1ft (0.3m x 0.3m)
Gasoline fire.
•Advanced Digital Processing Of The Dynamic Characteristics Of Fire.
•SingleSpectrum: UV radiation
•Multiple Detection Levels: Warning, alarm and saturated signal
•Solar Blind
•Microprocessor Based: Microcontroller performs signal processing
•Built In Test: Manual and automatic BIT for 20/20UB only
(see section 4.5)
•Electrical Interface:
oDry contact RELAYS.
o4-20mA outputs.
2.1 Principles Of Operation
The Model 20/20U, 20/20UB Radiation Flame Detector is an electronic device
designed to sense the occurrence of fire and flames and subsequently activate
an alarm or an extinguishing system directly or through a control circuit.
The UV Flame Detector is a single spectrum optical detector sensitive to the UV
radiation spectrum, which present in fires. The detector monitors the protected
volume, by measuring the radiation intensity in it, the frequency range of the
electromagnetic spectrum, namely the UV.
The detector senses one channel in which appropriate detection pulses are
registered and further analyzed for frequency, intensity and duration.
2.2 The Sensing Element
The UV sensor is sensitive to radiationover the range of 0.185-0.260 micron.
The UV channel incorporates a special logic circuit that eliminates false alarms
caused by solar radiation and other non-fire UV sources. Further more; the UV
channel sensitivity is stabilized over the working temperature range.
2.3 Detection Levels
Detection of radiation in the UV channel having an intensity which exceeds
detector’ preset Warning level will result in a Warning signal.
Detection of radiation in the UV channel having an intensity, which exceeds
detector’s preset Alarm level will result in an Alarm signal.

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2.4 Alarm Signal Delay
The detector is adapted with an Alarm Signal delay selector, providing a user to
set a different delay between 0 to 30 seconds, mandatory for several specific
applications.
When Alarm level detection conditions are met, an internal time delay is initiated
as preset on the selector. Once the preset time delay has elapsed, detection
conditions are evaluated for 3 seconds. If during that evaluation period Alarm
level detection conditions persist, the Alarm signal is triggered. If no Alarm level
detection conditions endure, the Alarm signal Delay is reset.
2.5 Built-In-Test (BIT) Capabilities
The detector is adapted with BIT (Built-In-Test only in 20/20UB) capabilities. The
automatic BIT is performed at predetermined time intervals averaging 60
minutes. It performs automatic full-featured test of the detector’s internal
electrical circuits, checks the radiation sensors and the detector window’s
cleanliness.
The BIT circuits will generate response signals to indicate adequate operation of
the detector or a fault should it be detected during a BIT sequence.
The BIT sequence can also be initiated manually by the user at his preference,
upon a remote operation from a control unit.
The Auto BIT does not check the output stages and the connection to the control
system. Should you wish to check the output stages and wiring to the controller,
a manual BIT should be performed -refer to section 7.4.
2.6 Detector Structure
Figure 1 presents an outline drawing of the Flame Detector Assembly. Figure 2
presents a schematic section of the internal Flame Detector, and describes its
main components.
2.7 System Configuration
The Spectrex model 20/20U, 20/20UB is a self-contained Optical Flame Detector
that can function as a stand alone unit directly connected to external devices as
alarm systems or automatic fire extinguishing systems. The same detector can
form part of a more complex system where a plurality of detectors and other
devices are integrated through a dedicated control unit.

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2.8 Detector Types
This manual covers two types of detectors. Model 20/20UB and model 20/20U,
the difference is that Model 20/20UB includes a BIT and 20/20U does not include
this feature.
The two Models are available in Aluminum (Al.) housing, or Stainless Steel
(St.St.) housing. They also include an option for higher ambient temperature
185°F (+85°C) upon requirement.
Figure 1. Flame Detector Assembly-Outline Drawing

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Figure 2. Flame Detector Assembly -Schematic Section
Note 1: This figure describes the Detector, which includes Ground Terminal
for ATEX installation. For FM installation device, external grounding
screw mounting.
Note 2: Thread for conduit standard size is 3/4”-14NPT (M25 optional)

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3. Performance
3.1 Detection Sensitivity
Detection sensitivity is the maximum distance at which the detector will reliably
detect a specific size of fire & typical type of fuel (standard fire).
Standard Fire:
Standard fire is defined as a 1ft x1ft (0.3m x 0.3m) Gasoline pan fire with max.
Wind speed of 6.5ft/sec (2m/sec).
SensitivityRanges:
The detector has two response levels:
1. Warning (Pre-alarm)
2.Alarm
For some typical ambient conditions the Zeta parameter as defined in NFPA 72
for the detector is 0.0003 (1/meter).
Note:
Zeta parameters may vary significantly with changes in temp, air pressure,
humidity, visibility conditions, etc.
Response Time:
The typical response time of the detector is 3 seconds. for 1 sq. ft. gasoline fire.
Other Fuels:
The Detector will react to other fuels in standard fire conditions at maximum
response time of 5 seconds.
The sensitivity range of other fuels varies according to the fuel type. The
percentage of the range for a fuel type that is relative to gasoline standard fire
source is given at Table 1 below.
Table 1. Response Sensitivity Ranges
Type of Fuel % of Max. Distance at Each
SensitivityRange
Gasoline 100%
N-Heptane 100%
Alcohol 95% 75%
JP4 100%
Kerosene 75%
DieselFuel 75%
Methane Fire* 60%
Propane Fire* 60%
* 0.5m plume fire

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3.2 Cone Of Vision
Horizontal: 90°
Vertical: 90°
Figure 3 illustrates the relative range as a function of the incidence angle.
Figure 3. Horizontal and Vertical Fields of View

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3.3 False Alarms
The detector does not provide an alarm or a warning signal as a reaction to the
radiation sources specified at Table 2 below.
Notes:
IAD = Immune at any distance.
All sources are chopped from 0 to 20 Hz.
Table 2. Immunity to False Alarm Faults
Radiation Source Immunity
Distance ft. (m)
Sunlight IAD
Indirect or reflected sunlight IAD
Vehicle headlights (low beam) conforming to MS53023-1IAD
Incandescent frosted glass light, 100W IAD
Incandescent clear glass light, rough service, 100W IAD
Fluorescent light with white enamel reflector, standard office
or shop, 40W (or two 20W) IAD
Bright colored clothing, including red and safety orange IAD
Red dome light conforming to M251073-1IAD
Blue-green dome light conforming to M251073-1IAD
Flashlight (Mx 991/U) IAD
Radiation heater, 1500W IAD
Radiation heater, 1000W with fan IAD
Lit cigar or cigarette 5ft. (1.5m)
Match, wood, stick including flare up 13.3ft. (4.0m)
Please Note: UV flame detectors are sensitive to false alarm from UV radiation
sources such transforms, motors, welding, spikes, etc. (That may be present in
the protected area or far away.)

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4. Operation
4.1 Visual Indications
Two indications LEDs are located in the detector’s front window.
Yellow LED -Provides indication of Normal or Fault state.
Red LED -Provides indication of Warning or Alarm state.
Table 3. LED indications within different detector states
Detector State Yellow LED Red LED
Normal Blink at 0.5Hz Rate Off
Fault or BIT Fault Blink at 2Hz Rate Off
Warning Blink at 0.5Hz Rate Blink at 2Hz Rate
Alarm Blink at 0.5Hz Rate On
Warning at BIT Fault Blink at 2Hz Rate Blink at 2Hz Rate
Alarm at BIT Fault Blink at 2Hz Rate On
4.2 Output Signals
The detector includes the following control outputs:
•Alarm Relay
•Accessory Relay
•Fault Relay
•4-20mA Current Source Output

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4.3 Mode Selection
The detector has 2 DIPswitches, which enables the user to adapt the detector’s
operation to specific applications:
•Function switch (SW1)
•Alarm Delay Switch (SW2)
4.3.1 Function switch (SW1)
The user can select the desired mode of operation by means of this switch
according to Table 4.
Table 4. Function Switch SW1
SW ON Position OFF Position
1Alarm Signal Latching enabled. Reset
of the Alarm signal is performed by
momentarydisconnection of power
supply or manual BIT activation.
Alarm Signal Latching disabled
(default).
2Automatic & Manual BIT can be
performed(default). Only Manual BIT can be
performed.
3Not Used
4Accessory Relay used by the Warning
level. Accessory Relay usedin parallel
to the Alarm Relay (default).
5Not Used
6Following a successful Manual BIT
sequence:
Alarm Relay is activated and the
4-20mA output turns to 20mA for
approximately 3 seconds(default).
Following a successful Manual
BIT sequence (1),(2):
Alarm Relay is not activated
7Following a successful Manual BIT
sequence(2):
Accessory Relay is activated and the
4-20mA output turns to 16mA for
approximately 3 seconds(3) (default).
Following a successful Manual
BIT sequence(2):
Accessory Relay is not activated.
8Accessory Relay used as EOL relay. Accessory Relay function in
accordance with the position of
SW1-4 (default).
Notes:
1The BIT sequence may last up to 7 seconds. Verify that all eight (8) switches
are in the appropriate setting (ON/OFF), to achieve the required functional
mode of operation.
2SW1-2,SW1-6,SW1-7 are function only for models 20/20UB. Model 20/20U
does include BIT.
3If both SW1-6 and SW1-7 are at on position the 4-20mA output is 20mA
(Alarm Level) after successful manual BIT.

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Optional Latching (default is non-latching):
The detector includes a latched alarm output capability, which operates
according to the DIP-switch SW1-1 position. Upon the detection of a fire, the
detection signal is latched until manually reset (disconnecting the power supply
or upon performing a manual BIT). Latching affects the Alarm Relay, 4-20mA
output, Alarm LED, (the ACCESSORY RELAY will latch only when SW1-4 at
OFF position).
Built-in Test Options(refer to 2.5):
Successful Manual BIT activates the following outputs according to SW1
switches:
SW1-6 ON: The Alarm relay will be activated for 3
seconds. The 4-20mA output will provide
20mA for 3 seconds.
SW1-7 ON & SW1-6 ON: The Accessory & Alarm relays will be activated
for 3 seconds. The 4-20mA output will provide
20mA for 3 seconds.
SW1-7 ON & SW1-6 OFF: The Alarm relay will be activated for 3
seconds. The 4-20mA output will provide
16mA for 3 seconds.
ACCESSORY RELAY AS EOL: If SW1-8 is ON then the Accessory Relay is
used as End of Line (EOL) relay. In this case
the accessory relay is always active as long as
the detector is powered.

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4.3.2 Alarm Delay Switch (SW2) –default 5 sec.
The detector is equipped with different Alarm Delay options. It provides
programmable time delays of 0 to 30 seconds with eight (8) fixed settings at: 0, 3,
5, 10, 15, 20, 25 and 30 seconds, using SW2 switches 1-3. (See Table 5.) When
an Alarm (Detection) level condition is encountered, the detector delays
execution of the Alarm Relay and the 4-20mA output by the specified period of
time. The detector will then evaluate the condition for required delay period. If the
Alarm level is still present, the Alarm indications return to its standby state.
Table 5. SW2 Alarm Delay Setting
Delay SW2 switches
(seconds) 4321
0N/A Off Off Off
3* N/A Off Off On
5N/A Off On Off
10 N/A Off On On
15 N/A On Off Off
20 N/A On Off On
25 N/A On On Off
30 N/A On On On
* Default
Note: The new FM approval from January 2003 does not allow use of 20, 25and
30-second delay settings.