Honeywell FS20X Series User manual

Installation Guide and Operating
Manual
FSX
™
Fire and Flame Detectors
Model FS20X™ Series
FS20X WideBand IR™ / UV
Multi-Spectrum Infrared / Ultraviolet Electro-Optical Multi-Spectral Digital
WideBand IR Sensor with Ultraviolet Phototube
Radiant Energy Fire and Flame Detector

Installation Guide and Operating Manual // Model FS20X™ Series
Read and understand this manual before
installing or operating equipment.
No part of this document may be copied or reproduced without the express
written permission of Honeywell Analytics.
This manual is subject to change without notice.
Copyright 2015 by Honeywell International Inc.
While this information is presented in good faith and believed to be accurate, Honeywell disclaims the implied
warranties of merchantability and fitness for a particular purpose and makes no express warranties except as
may be stated in its written agreement with and for its customers.
In no event is Honeywell liable to anyone for any indirect, special or consequential damages. The information
and specifications in this document are subject to change without notice.
ACCTTL, ALERT-1, ALARM-2, ALERT-1: ALARM 2, ALERT-1: ALARM-2, ATAG, Clean Room Sentry, COP-i,
Complete Optical Path Integrity, CM1, CM1-A, DartLogic, FireLogic, Fire Signature Analysis, FireBusI, FireBusII,
FirePic, FirePicII, FirePicIII, FirePix, FirePicture, FSC, Fire Sentry Corporation, Fire Sentry Corp., FSX, All FSX
Nomenclature Variations (such as: FS2, FS2X, FS3, FS3X, FS4, FS4X, FS5, FS5X, FS6, FS6X, FS7, FS7X,
FS8, FS8X, FS9, FS9X, FS10X, FS10X, FS11, FS11X, FS12, FS12X, FS14, FS14X, FS15, FS15X, FS16,
FS16X, FS17, FS17X FS18, FS18X, FS19, FS19X, FS20, FS20X, FS24, FS24X, FS24XN, FS26, FS26X,
FS26XN), FS7-2173-2RP, FS System 7, FS System 10, FS7-2173, FS7-2173-RP, FS2000, FS System 2000,
High Speed Flame & Surveillance Detector, Multi-Spectrum QuadBand Triple IR, Multi-Spectrum TriBand, Multi-
Spectrum Tri-Band, Near Band Infrared, Near Band IR, NearBand IR, QuadBand IR, Room Sentry, RS, RS2,
SM2, SM3, SS, SS2, SS2X, SS2-A, SS3, SS3-A, SS3X, SS4, SS4-A, SS4X, SnapShot, SLR-BIT, SuperBus,
SuperSentry, System 2000, Tri-Mode Plot, QuadBand Triple IR Plus, TriBand, Tri-Band, “FS & FSC triangle
logo’s”, WBIR, Wide Band Infrared, WideBand IR, Wide Band IR
are registered trademarks of Honeywell International Inc.
Other brand or product names are trademarks of their respective owners.
Honeywell Analytics

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 1
TABLE OF CONTENTS
PAGE
SECTION 1: INTRODUCTION UT .................................................................................................................................... 2
TU1.1UT TUProduct Overview UT ............................................................................................................................................. 2
TU1.2UT TUDetector Technical Specifications UT .................................................................................................................... 3
TU1.2.1UT TUMechanical Specifications UT .................................................................................................................... 3
TU1.2.2 Electrical Specifications ........................................................................................................................ 3
U1.2.3UUEnvironmental Specifications U............................................................................................................... 3
U1.2.4UUPerformance Specifications U.................................................................................................................. 3
U1.2.5UHazardous Area Classifications U............................................................................................................ 3
1.2.6 Flame Performance Certification ........................................................................................................... 3
U1.3 Features & Benefits .......................................................................................................................................... 5
U1.4 Applications ...................................................................................................................................................... 6
SECTION 2: INSTALLATION U..................................................................................................................................... 7
U2.1 Mounting Instructions ....................................................................................................................................... 7
U2.2 Opening the Detector ....................................................................................................................................... 8
U2.3 Detector Connections ...................................................................................................................................... 10
U2.4 Installation Practices ....................................................................................................................................... 12
U2.5 Start-Up and Commissioning .......................................................................................................................... 14
SECTION 3: OPERATION ......................................................................................................................................... 16U
U3.1 Principle of Operation ...................................................................................................................................... 16
U3.2 Configuring the Detector ................................................................................................................................. 16
U3.3 Normal Operation ............................................................................................................................................ 18
U3.4 Alarm Condition ............................................................................................................................................... 18
U3.5 Fault Conditions .............................................................................................................................................. 19
U3.6 LED Status Indicators ..................................................................................................................................... 18
U3.7 Maintenance .................................................................................................................................................... 19
SECTION 4: APPENDIX ............................................................................................................................................ 20U
U4.1 Warranty Information ....................................................................................................................................... 20
U4.2 Product Variations ........................................................................................................................................... 21
U4.3 Digital Communication Options ....................................................................................................................... 22
U4.4 Test Lamps ...................................................................................................................................................... 22
U4.5 Field of View Restrictor ................................................................................................................................... 23
4.6 Additional Performance Specifications ........................................................................................................... 23
4.6.1 Flame Response Sensitivity ................................................................................................................ 23
4.6.2 False Alarm Immunity .......................................................................................................................... 24
4.7 Drawings .......................................................................................................................................................... 25
4.7.1 Outline and Dimensions ....................................................................................................................... 25
4.7.2 Wiring and Terminal Connections......................................................................................................... 26
4.7.3 BRE Detector Labels ............................................................................................................................ 28
4.7.4 EN54 Detector Labels........................................................................................................................... 29
INDEX.......................................................................................................................................................................... 29
CONTACT HONEYWELL ANALYTICS ..................................................................................................................... 30

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 2
SECTION 1: INTRODUCTION
1.1 Product Overview
The Model FS20X™Detector senses the Ultraviolet and
WideBand IR™ radiant energy of blackbody particulate and
molecular emissions generated by both hydrocarbon and non-
hydrocarbon flames and fires. The WideBand spectral radiant
energy wavelengths sensed by the Quad (4) sensors span
approximately 0.185 to 0.26 microns and 0.4 microns to 3.5
microns for the FS20X Detector.
The Model FS20X Multi-Spectrum Fire and Flame Detector is
designed and Factory Mutual approved for use in Class I,
Division 1 and 2, Class II and Class III; AEX d/Ex d IIC, and
ATEX/IECEx Ex db IIC, Ex tb IIIC Hazardous Locations (see
Figure 1-1).
The FS20X Detector is available in copper-free Aluminum or
in 316 Stainless Steel enclosure. The FS20X Detector
electro-optical electronics module (puck) is enclosed in a
replaceable black, hard anodized aluminum puck that
provides superior ruggedness, handling, ease of installation,
and protection against EMI/RFI.
Figure 1-1
FS20X Detector
Shown with Copper Free Aluminum Housing
FS20X Detector Field Connectors
The field connections feature two (2) connector choices for the installer:
1. A removable ten (10) pin screw terminal connector (J2) for hardwired relay applications.
2. A removable six (6) pin screw terminal connector (J1) for analog output or RS-485 Digital
Communication applications.
The removable connectors provide quicker installation and allows the Detector enclosure to be installed prior
to the Detector Module (puck).
Field Selectable Configuration Switches
1. The eight (8) pin DIP switch (SW2) is used to select the
Detector’s Sensitivity and Relay Options.
2. The ten (10) pin DIP switch (SW1) is used for:
Selecting a unique digital address (128 choices).
Factory Use
3. The ten (10) position Rotary switch allows selection of
the analog and digital communication protocol.
Figure 1-2
FS20X Detector Puck, (rear view)

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 3
1.2 Detector Technical Specifications
1.2.1 Mechanical Specifications
Enclosure Material: Copper Free Aluminum (red)
316 Stainless Steel
Physical Dimensions: Assembly 4.35 in. (110.49 mm) Height X 4.81 in. (122.24 mm) Diameter
Mounting Holes ¼ in. (6.35 mm) Diameter, 5.50 in. (139.70 mm) Center to Center
Conduit Entries Two (2) ¾ in. NPT or Two (2) 25 mm
Weight: Aluminum 3 lbs. 11 oz. (1.7 kg) approximately
Stainless Steel 7 lbs. 7 oz. (3.4 kg) approximately
Enclosure Rating: IP66 / NEMA 4 / NEMA 4X
Vibration: Meets or exceeds Mil Spec 810C,
Method 514.2, Curve AW
1.2.2 Electrical Specifications
Input Voltage Range: 18 VDC to 32 VDC
Normal Operation Current: 85 mA (nominal) 175 mA (nominal with heaterP
1
P)
Maximum Fire Alarm Current: 135 mA (maximum) 220 mA (maximum with heaterP
1
P)
Relay Contact Rating: 1 Amp @ 24 VDC resistive
Analog Current Output: 0.0 to 20.0 mA (Non-Isolated Source or Sink, User Selectable)
(
400 Ohms Max Load [loop resistance]) 0.0 mA (<0.6 mA) = Fault
2.0 mA (±0.6 mA) = Dirty Window Lens
4.0 mA (±0.6 mA) = Normal, Safe (no Fault, no Fire)
8.0 mA (±0.6 mA) = Background IR
12.0 mA (±0.6 mA) = Background UV
16.0 mA (±0.6 mA) = Fire Alarm
20.0 mA (±0.6 mA) = Verified Fire Alarm
Screw Terminal Wire Sizes: 12 AWG to 22 AWG (2.50 mm to 0.762 mm)
Use stranded conductors (UnotUsolid core)
1.2.3 Environmental Specifications
Operating Temperature Standard: -40° F to +185° F (-40° C to +85° C)
Operating Humidity Range: 0 to 95% RH,
100% RH condensing for short periods of time
Storage Temperature: -67° F to +221° F (-55° C to +105° C)
1.2.4 Performance SpecificationsP
2
P
Field of View: FS20X detectors have a cone of view of 90° horizontal and
80° vertical with the highest sensitivity on the central axis
Sensitivity One (1) sq. ft. heptane fire at 200 feet (± 45° from axis)
Speed of Response: Typically, 2 to 5 seconds
High Speed Response: Less than 0.5 seconds to “fireball” type fires
Spectral Sensitivity ~0.185 to 0.26 microns and 0.4 microns to 3.5 microns
1.2.5 Hazardous Area Classifications (See Section 4.7.3 on Pages 32)
Class I, Division 1, Groups A, B, C & D
Class II, Division 1 Groups E, F & G Class I, Zone 1, AEx d/ Ex d IIC
Class III Ex db IIC, Ex tb IIIC
T4: Ta = -40°C to +110°C T4: Ta = -40°C to +110°C
T5: Ta = -40°C to +75°C T5: Ta = -40°C to +75°C
T6: Ta = -40°C to +60°C T6: Ta = -40°C to +60°C
1
PHeater circuit turns ON only when temperature drops below zero degrees Fahrenheit (-17° C)P
2The supply connection wiring shall be rated at least 10°C above the rated service temperature (120°C for T4 applications and 85°C for
T5 applications)

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 4
1.2.6 Flame Performance Certification (See Section 4.7.3 on Pages 31)
Agency Standard Certificate Notes
LPCB EN 54-10:2002 +A1:2005 1175a/01 Sensitivity settings: Very High, High, Medium
EN 54-10 Class 1
CPR EN 54-10:2002 +A1:2005 0832-CPR-F0515

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 5
1.3 Features and Benefits
Selectable Sensitivity (four settings)
User can set an F20SX Detector to four (4) different detection distances (see Section 3.2).
Selectable Relay Options
User can configurable for a variety of dry contact relay interface options (see Section 3.2).
Selectable 4 – 20 mA Output
User can set for Source or Sink output (see Section 3.2).
Selectable Communications
User can configure for analog or digital communication outputs such as ModBus (see Section 3.2).
Selectable Digital Communication Address
Users can select unique 7-bit code (128 addresses) (see Section 3.2).
Lower Power Consumption
Requires smaller external power supplies and fewer system backup batteries.
Multiple Microprocessors
Reduces the number of discrete Detector components, provides larger programming and memory
capacity, and provides redundant self-checking.
Wider Range of Applications
Primary applications include long range, fast response to fires such as acetylene, silane, hydrogen, etc.
Wider Operating Temperatures
-40°F to +185°F (-40°C to +85°C) Standard
Built-In Automatic “Through-the-Lens” Self-Test
Monitors window lens obscuration and checks the operation of the Detector’s Sensor Array and Electro-
Optical Electronics Module with Built-In IR (FS19X & FS20X) and UV (FS20X) Self-Tests.
Anodized Removable Detector Aluminum Module (Puck)
Rugged, superior protection against EMI/RFI and handling plus easier field installation and replacement.
Three Separate Bright LED’s (Red, Yellow, Green)
Field status indicators with individual LED’s for Alarm, Fault and Normal conditions. Provides superior
Detector status viewing in bright outdoor environments (see Section 3.6).
FSC Windows® based PC Interface
User can perform remote FS20X Detector diagnostics, real-time status, Real-Time Graphing (RTG),
SnapShotdata recording, and downloading FirePic’swith Honeywell Analytics’ exclusive FSIM-2
USB Interface Unit and easy to use Windows®based PC Software.
Designed to Detect both Hydrocarbon and Non-Hydrocarbon Fires with one FSXDetector
All fire and flame threats are sensed, not just hydrocarbon fires as with other Triple IR Flame Detectors.
FM 3260 Approved
Third party tested and certified for industrial and commercial applications.
Designed, Manufactured, and Tested by Honeywell Analytics
Over 30 years of proven fire / flame detection product excellence worldwide.

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 6
1.4 Applications
The applications for the FS20X Fire and Flame Detector are vast. Here is a partial list:
Refineries
Offshore Drilling and Production Platforms
Petrochemical Plants
Petroleum Product Pipelines and Pumping Stations
Gas Compressor Buildings
Gas Collection Facilities
Gas Processing Plants
Gas Turbine Enclosures
Gasoline Loading Terminals
LNG Storage/Distribution
LPG Storage/Distribution
Cogeneration Plants
Crude and Product Tank Farms
Aerosol Filling Facilities
Commercial and Military Aircraft Hangars
Engine Test Cells
Marine Engine Rooms
Marine Terminals
Paint and Solvent Storage
Power Plants
Product Storage Terminals
Rail and Truck Loading and Unloading Terminals
Silane Gas Cabinets
Silane Gas Manufacturing
Hydrogen Plants
Hydrogen Storage
General Warehouses

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 7
SECTION 2: INSTALLATION
2.1 Mounting Instructions
Consider the following guidelines when selecting Detector location:
1. As with all flame and fire Detectors, avoid areas that contain radiant energy sources (such as radiant
heaters, high intensity lamps, flare-stacks, etc.) in close proximity to the Detector’s field of view.
2. The installation shall take into account that the FS20X orientation should be with the base horizontal
(see Figure 2-1) as the view angle in this direction is 90°. The vertical angle is 80°.
Horizontal Field of View
Figure 2-1
FS20X Graphical View
3. Detectors should not be mounted so that they look up or face the horizon (especially outdoors). Use
a minimum thirty degrees (30°) downward angle with the SM4 swivel mount (see Figure 2-2).
4. Make sure the Detector has a clear, unobstructed view of the threat area. Physical obstructions
between a fire and the Detector may cause the fire to be undetected.
5. The Model SM4 is a 316 Stainless Steel Swivel Mount designed for the FSC Detector housing. The
adapter plate, with the two (2) screw holes (facing away), is attached to the base of the Detector (see
Figure 2-2). The mounting plate, with the four (4) screw holes (facing towards), is used for mounting
the SM4 to a solid surface. Each adjustment increment along an axis is calibrated to 10°. For single
axis adjustments, the center section need not be installed.
6. Avoid mounting the Detectors in areas where temperatures exceeds the specified operating
temperature range (see Sections 1.2.3 & 1.2.5).
7. Detector Conduit Entries
a) If only one conduit entry is used, correctly install and seal the conduit plug on the unused entry,
¾ in. NPT or 25mm (see Figure 2-3).
b) Install an approved conduit trap or drain, if required to meet hazardous area classifications per
NFPA 70: National Electrical Code, latest revision.
Note: The maximum specified FOV is the angle at which the detector can detect a flame at 50% of
the maximum specified range. To comply with the directional dependence requirements for EN 54-
10:2002, an angle of ±40° (80°) from 0° (where 0° is the orientation of the detector in the same axes
as the flame source) should not be exceeded, based on lab testing at a distance of approximately
5.3 ft (1.6 m).

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Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 9
4. Loosen the set screw on the enclosure lid
(see Figure 2-6).
Figure 2-6
5. Turn counterclockwise (CCW) to unscrew
the enclosure lid (see Figure 2-7).
Figure 2-7
6. Loosen the three captive screws on the
Detector Module “puck” (see Figure 2-8).
Figure 2-8
CAUTION: Disconnect power before
unscrewing the Housing Lid.

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 10
7. Slide the Detector Module “puck” out of the
enclosure base (see Figure 2-9).
Figure 2-9
2.3 Detector Connections
The Detector Module puck has a six (6) pin and a ten (10) pin keyed removable connector with screw terminal
female plugs that connect to the two (2) respective male connectors with analog, digital, and relay interfaces
(see Figure 2-10):
For relay configurations, use the ten (10) pin plug (J2) and its connector.
For digital and analog configurations, use the six (6) pin plug (J1) and its connector.
J2 Connector
Figure 2-10
Detector Module “puck” (rear view)
J1 Connector
Pin Connection Pin Connection
1 Auxiliary NC 1 DC Return
2 Auxiliary NO 2 RS-485-A
3 Auxiliary COM 3 RS-485-B
4 Alarm NC 4 +24 VDC
5 Alarm NO 5 4-20mA Source
6 Alarm COM 6 4-20mA Sink
7 Fault NO
8 Fault COM
9 +24 VDC
10 DC Return
Contacts shown with
no power applied
Note: Do not attempt to open the Detector Module “puck” as this voids all warranties.

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 11
Figure 2-11
Recommended Wiring Configurations

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 12
Detector Connections (continued)
ATTENTION: FSX Power-Up – After the application of 24 VDC power or resetting the Detector, wait a
mimimum of (thirty) 30 seconds to allow the Detector’s sensors to normalize to the
spectral background conditions.
FSX Testing - As with any intelligent IR Detector, please wait a minimum of thirty (30) seconds
between tests (i.e., butane lighter, FSC test lamp, or test fires) to allow the Detector’s
sensors to normalize to the spectral background conditions.
Changing the Detector Settings – To activate changes to the settings using SW1, SW2 and SW3,
reset the Detector by removing and re-applying 24 VDC input power.
1. Verify that the external 24 VDC power is turned UOFFUbefore connecting the Detector.
2. Avoid wire splices whenever possible. If wire splices are required, solder and properly insulate them.
Good wiring practices simplify installation, improve reliability, and facilitate maintenance.
3. For applications requiring analog/digital communications, refer to Section 3.2.
2.4 Installation Practices
For installations in a Hazardous Classified Area, consult the National Electric Code Handbook, Articles 500
through 517 for the proper installation practices. For locations outside of the United States, observe local
and/or regional regulations.
IMPORTANTU: The Detector’s metal conduit plug by itself cannot make a weather-tight seal. Metal-to-metal
does NOT provide protection against the ingress of moisture. It is necessary to obtain an approved material
to apply to the threads in order to maintain the “weather-proof” integrity and satisfy local/regional regulations.
Figure 2-12
Terminals

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 13
UBefore completing the installationU, check that the Detector is configured correctly for the specific
application. The FSX Detectors Factory Default Settings are:
Alarm Relay Outputs are Non-Latching and Normally De-Energized SW2-1 OFF SW2-7 OFF
Detector Range / Sensitivity is Medium SW2-2 OFF SW2-3 ON
Auxiliary Relay Verify Time is set to 5 Seconds SW2-4 ON SW2-5 ON
FACTORY USE ONLY SW2-6 OFF
Fault Relay Output is Normally Energized SW2-8 ON
Communication is set to FireBusII SW3 is set to Position 4
Factory Use Only SW1-1 through SW1-3 OFF
Digital Communication Address is set to 127 SW1-4 through SW1-10 ON
If the application for the Detector requires different settings, refer to Section 3.2 for detailed descriptions.
U
Before applying 24 VDC power to the Detector, make sureU:
1. Wire connections are correct (Section 2.3). Each wire must be stripped properly to the correct length,
loose wire strands must be removed and each wire must be securely and firmly screwed clockwise in
the connector.
2. If using conduit, ensure a proper conduit seal, (appropriate for the area classification), has been
installed and Uall measures to prevent moisture ingress have been takenU.
3. Consult the manufacturer for dimensional information on the flameproof joint specifications.
4. The FSX Detector is securely mounted and has an unobstructed view of the area of coverage
(Section 2.1).
5. The Detector window is unobstructed and clean,
6. To ensure optimum performance, shield the detector face from intense bright light sources when first
energized.
The Detector is now ready for Power-Up. UOn Power-Up, the Fault Relay will change status if the Factory
Default Setting is used (Section 3.2).

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 14
2.5 Start-Up and Commissioning
During Start-Up and Commissioning, DISABLE all outputs from the Detector to any control panels or control
devices. After the Detector(s) is powered, as with all flame and fire detectors, one should conduct an external
Detector test “end to end”. Using an external hand-held test lamp ensures that the Detector has a clear
unobstructed view of the threat area.
Note: Honeywell Analytics FSX Detectors feature an automatic built-in "through the lens" test that
verifies the cleanliness of its viewing window lens every three seconds and tests it internal
electronics and software. As with UallUoptical fire and flame detectors, this does not constitute
a fully functional "end to end" test as these types of internal self-tests only Upartially Ucheck and
test the operational readiness of a detector.
In order to test the full functionality and operational readiness of UanyUfire or flame detector
"end to end", without starting a real fire (which is not permitted in hazardous areas), it is
necessary to test the detector(s) with an external test lamp
Using a test lamp is the UonlyUnon-hazardous and safe method to test any flame or fire
detector’s sensors, internal electronics and its alarm activation software, viewing window lens
cleanliness, terminal wiring integrity, actual relay activation, and the proper functionality of
any other outputs that are used. Also, since most detectors are installed in a fire alarm
system, this is the only method to test the complete fire alarm system, ensuring all the system
wiring and cabling and system control panel are properly installed.
Additionally, using an external test lamp eliminates the following detector conditions:
1. The fire or flame detector(s)' viewing lens being covered up (such as paint, paint over
spray, paint masking material, hanging garments, etc.),
2. Improperly positioned and orientated for coverage of the threat area,
3. Partial or full blockage of the detector's line of sight by one or more object(s) (i.e., recently
installed air ducts or pipes, storage boxes, vehicles, etc. such that the threat area is not
fully protected. Since all optical fire and flame detectors are line-of-sight devices, they
must be properly positioned and oriented with an unobstructed view of the threat area so
that they can detect flames/fires.
To test the full functionality of the FSX Detector, use the Model TL-1055 or TL-2055 Test Lamp
in the manner prescribed in this Instruction Manual.
The TL-1055X and the TL-2055X are the only Test Lamps that will activate the FSX Detectors.
Additionally, do not use these Test Lamps to activate other Honeywell Analytics Detectors
(nor any other conventional fire and flame detectors). Do not use other Honeywell Analytics
Test Lamps to test the FSX Detectors.
Figure 2-13
TL-1055 Hand Held Test Lamp (NEMA 1)
Figure 2-14
TL-2055 Hand Held Test Lamp for Hazardous Areas
FM, CFM, FM-ATEX,IECEx Approved
WARNING: Use test lamp model TL-1055 in non-hazardous locations only! For hazardous
locations
,
use model TL-2055
,
as described below.

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 15
Start-Up and Commissioning (continued)
Remember to disable the outputs, as a full functional test includes activating the ALARM outputs. A
Honeywell Analytics Test Lamp must be used for this test (Section 4.4). Point the Test Lamp directly at the
front of the Detector (on axis as much as possible, within a distance of about 1 to 25 feet). Activate the Test
Lamp by pressing and holding its pushbutton. While watching the ALARM LED on the face of the Detector,
slowly move the Test Lamp’s boresight to ensure the Detector receives its full intensity. (UNOTE: Practicing
this technique may help to optimize testing of the FSX DetectorsU). (Sections 3.6 and 4.4). The
Detector’s ALARM LED will illuminate, usually within three (3) to ten (10) seconds. Also, the ALARM Relay
outputs will activate and the 4-20 mA analog output will increase to 20 mA (±0.6 mA).
If the Detector fails to respond within ten (10) seconds, do the following:
1. Wait ten (10) to twenty (20) seconds before performing another test.
2. Check the Distance: verify that the testing distance is between one (1) and twenty-five
(25) feet from the FSX Detector(s).
3. Check Aiming Accuracy: verify that the proper testing technique (as described above) is
followed.

Installation Guide and Operating Manual // Model FS20X™ Series
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SECTION 3: OPERATION
3.1 Principle of Operation
Honeywell Analytics' Multi-Spectrum, Multi-Spectral and MultiBand™Infrared and Ultraviolet Fire and Flame
Detectors are sophisticated, state of the art, electro-optical digital radiant energy Detectors that sense the
wideband radiant energy emitted by fire’s combustion processes that include flames’ molecular emissions and
hot particulate blackbody emissions. Radiant Energy Fire Detectors respond much faster to flames and fires at
a longer distance than other types of conventional photoelectric and ionization smoke and heat detectors
because a fire’s emitted radiant energy travels at the speed of light. High speed of response is critical for
detecting flaming fires in time to successfully activate suppression or activate other fire responses such as
closing fire doors. Seconds can make the difference between suppressing a small fire with little or no damage
or having a disastrous fire that overwhelms a suppression system thereby failing to stop the fire.
Infrared (IR) consists of spectral wavelengths longer than the color red and Ultraviolet (UV) consists of
wavelengths shorter than the color violet. For the FS20X Detector, the UV and IR range for fire detection, which
a large portion of the spectrum is invisible to the human eye, is from approximately 185 to 260 nanometers and
0.4 to 3.5 microns. Honeywell Analytics’ Detectors sense and measure the radiant energy generated by a fire
at the speed of light.
Honeywell Analytics’ FSX Fire Detectors also use an additional spectral region, the Visible Band, that spans
from about 400 to 700 nanometers (0.4 to 0.7 microns.) The Visible Band is used to further discriminate against
non-fire false alarm sources. The Model FS20X Detector senses radiant energy coming from hydrocarbon and
non-hydrocarbon fires. Built-in microprocessors use sophisticated Digital Signal Processing (DSP) to accurately
distinguish radiant energy from a real fire and a false alarm source(s). Honeywell Analytics has developed and
refined these complex proprietary and patented WideBand IR and UV algorithms for over a quarter of a century
since 1981. These patented algorithms perform real-time DSP, and precisely analyze the signals in high-
resolution frequency and time domains. This decision making process involves thousands of real-time
calculations every second. Honeywell Analytics FSX Detectors use solid-state high speed quantum sensors
(not heat sensors such as pyroelectric or thermopile) that all respond to the fire’s radiant energy emissions. The
quantum sensors convert the rate of photonic energy directly into analog electrical signals. These analog
signals are converted to high resolution digital values for real-time microprocessor analysis.
The Detector microprocessors incorporate random access memory (RAM), read-only memory (ROM), and non-
volatile flash memory. When the microprocessors determine that a real fire has been detected, the pre-alarm
digital sensor data (FirePic™) and the event information are recorded in flash memory. Depending on the
configuration, other actions may include activating one or more status LEDs, relays, a current loop and sending
digital data such as the RS-485 FireBusII™, and ModBus. If the microprocessors determine, based on internal
testing and “through-the-lens” testing, that the Detector is not operating correctly, it records the Fault data in
flash memory and activates the Fault outputs and the yellow status LED. The digital data in the Detector can be
easily accessed with a PC for later analysis and record keeping using Honeywell Analytics’ Windows®based
PC software and FSIM-1A USB Interface Unit.
3.2 Configuring the Detector
IMPORTANT: Changing the Detector Settings – To activate changes to the settings using SW1, SW2 and
SW3, reset the Detector by removing and re-applying 24 VDC input power.
The Digital Address for the RS485 Communication can be set using positions 4 through 10 on SW1. Switch
positions 1, 2 & 3 for SW1 are for factory use only and should not be changed.
1 2 3 4 5 6 7 8 9 10
127 OFF OFF OFF ON ON ON ON ON ON ON
126 OFF OFF OFF ON ON ON ON ON ON OFF
125 OFF OFF OFF ON ON ON ON ON OFF ON
124 OFF OFF OFF ON ON ON ON ON OFF OFF
003 OFF OFF OFF OFF OFF OFF OFF OFF ON ON
Figure 3-1 (SW1)
Ten (10) Position DIP Switch
002 OFF OFF OFF OFF OFF OFF OFF OFF ON OFF
001 OFF OFF OFF OFF OFF OFF OFF OFF OFF ON
000 OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 17
Configuring the Detector (continued)
CAUTION - WARNING
When the switches SW1,
SW2, or SW3 are changed,
the Detector’s input power
must be cycled OFF, then
ON, in order for the
change(s) to be accepted.
Eight (8) position DIP Switch (SW2) - Figure 3-2
Use the following table to configure the Detector:
Alarm Relay SW2-1
Latching ON
Non-Latching OFF
Sensitivity Levels SW2-2 SW2-3
Very High (4) ON ON
High (3) ON OFF
Medium (2) OFF ON
Low (1) OFF OFF
Auxiliary Relay SW2-4 SW2-5
No Verify Time ON ON
5 Sec Verify Time ON ON
10 Sec Verify Time OFF ON
20 Sec Verify Time OFF OFF
SW2-6
Factory Use Only OFF
Alarm Relay SW2-7
Factory default settings are shown with a gray background. Energized ON
De-Energized OFF
Fault Relay SW2-8
*If the Fault Relay to set to “De-Energizied”, the Detector will not report
any faults due to loss of input power to the Detector.
Energized ON
De-Energized* OFF
Analog and digital outputs are available
in addition to relay outputs. Select from
two (2) analog outputs or two (2) digital
outputs using a ten (10) position Rotary
Switch (SW3). FireBusII is the factory
default setting. Use Table on the right
and Figure 3-3 to configure SW3.
Position Output Selection
0 4-20 mA Sink
1 4-20 mA Source
2 RS-485 ModBus
3 Factory Use Only
4 RS-485 FireBusII
5 Factory Use Only
6 Factory Use Only
7 Factory Use Only
Figure 3-3 SW3 8 Factory Use Only
Ten (10) Position Rotary Switch 9 Factory Use Only
Note: The Low Sensitivity range is not approved as compliant with the requirements of EN 54-10:2002.

Installation Guide and Operating Manual // Model FS20X™ Series
Honeywell 18
3.3 LED Status Indicators
The Model FS20X Detector uses three (3) separate, bright LED’s to indicate the Detector’s status.
The Green LED blinks (flashes) once every ten (10) seconds to indicate a Normal, safe operational
condition (i.e. no Faults and no Alarms). The Green LED is OFF when no external 24 VDC input
power is applied to the Detector.
The Red LED turns ON when a fire is Alarmed.
The Yellow LED blinks (flashes) when the window lens is dirty. For all other Fault conditions, the
Yellow LED will turn ON.
3.4 Normal Operation
In Normal operation, the bright Green LED blinks (flashes) every 10 seconds. See Figure 3-4 for the location
of the Green LED. Normal Operation is defined as the Detector with 24 VDC applied and no Alarm or Fault
conditions are present. If one of the 4-20 mA options are selected (Table 3-1), the current, sink or source, will
be 4.0 mA (±0.6 mA). Only the current source mode has been certified to the EN54-10 standard.
Figure 3-4
Green LED Location
3.5 Alarm Condition
When an Alarm condition occurs, the Red LED will turn ON, (factory setting with the Auxiliary relay set to “0”
seconds). See Figure 3-5 for the location of the Red LED.
The Detector has the following outputs with an
Alarm condition:
Alarm Relay activation
Auxiliary Relay activation1
4-20 mA (sink 16 mA) Alarm Output2
4-20 mA (source 16 mA) Alarm Output2
4-20 mA (sink 20 mA) Auxiliary Output2
4-20 mA (source 20 mA) Auxiliary Output2
RS-485 FireBusII Alarm Notification2
RS-485 ModBus Alarm Notification2
1 This output is a Verified Alarm Output
2 Only one active Alarm output from this group
Figure 3-5
Red LED Location