Sierra DCR1-CS1 User manual

Installation Manual
Sierra Safety Technology, Inc.
[phone] www.SierraSafety.com
DCR1-CS1
DCR1-CT1
FLAME DETECTOR MODELS

Installation Manual
Sierra Safety Technology, Inc.
[phone] www.SierraSafety.com
DCR1-CS1 & DCR1-CT1
Flame Detector Models
APPLICABILITY & EFFECTIVITY
This manual provides information for the follow products:
Model Highlights
DCR1-CS1:N.O. or N.C. Fire and Fault Relays. Latching Controls.
DCR1-CT1: N.O. or N.C. Fire and Fault Relays. Latching Controls. Sensor Self-Test.
N.O. = Normally Opened Contacts N.C. = Normally Closed Contacts (If N.O. or N.C. is not specified, then both options are included.)
This manual is effective for the above models as of November 1, 2019
Document Name: D025G1
Revision: 1.0
3260 5007142 EN 50130-4:2011 EN 60529

Table of Contents
1 PRODUCT DESCRIPTION ..................................................................................................... 1
1.1 Introduction.................................................................................................................. 1
1.2 Configuration ............................................................................................................... 1
1.3 Scope .......................................................................................................................... 1
1.4 Description................................................................................................................... 1
1.5 Fault Diagnostics ......................................................................................................... 2
2 OPERATION........................................................................................................................... 2
2.1 General........................................................................................................................ 2
2.2 Field-of-View................................................................................................................ 2
2.3 Range .......................................................................................................................... 3
2.4 Environment................................................................................................................. 3
2.5 Configuration Settings.................................................................................................. 3
2.6 LED Operation, Detector Modes & FireScape™ Function............................................ 3
2.7 Outputs........................................................................................................................ 5
3 INSTALLATION ...................................................................................................................... 6
3.1 General Precautions .................................................................................................... 6
3.2 Housing ....................................................................................................................... 6
3.3 Wiring Connections...................................................................................................... 6
3.4 Testing......................................................................................................................... 8
4 MAINTENANCE...................................................................................................................... 9
4.1 Lens Cleaning.............................................................................................................. 9
5 TROUBLESHOOTING ...........................................................................................................10
5.1 No LED blink or erratic LED blink................................................................................10
5.2 Detector Indicates Fault ..............................................................................................10
5.3 Detector Goes into Alarm but No Fire Appears to be Present .....................................11
5.4 Detector Appears to Operate Normally but Will Not Alarm to a Fire or Test Source ....11
6 SPECIFICATIONS .................................................................................................................12
7 APPENDIX A – FIGURES......................................................................................................13
8 APPENDIX B - TABLES.........................................................................................................15

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1 PRODUCT DESCRIPTION
1.1 Introduction
DCR1-C flame detectors are Factory Mutual 3260 approved short-range detectors that use a
multiple spectrum sensor array (see FIGURE 7-2) to sense temperature, ultraviolet (UV) and
infrared (IR) energy. The internal microprocessor, using state-of-the-art fire algorithms, evaluates
these sensor inputs with flame signature analysis. This is performed by algorithms which evaluate
spectrum signatures to detect most hydrocarbon fires, as well as other fuel types (i.e. Silane,
Hydrogen, Heptane, IPA and MEK.) These signatures correlate the intensity values, change of
intensity values, relationship of intensity values, and frequency distribution of the sensor inputs.
Many common false sources (spurious energy emissions) are filtered out by these algorithms.
Providing continuous and reliable flame detection, the DCR1-C declares an alarm event when the
conditions of a fire algorithm are met. The DCR1 series of detectors provide superior resistant to
most acids and solvents, including, but not limited to: Hydrofluoric; Sulfuric; Nitric; Phosphoric;
Hydrochloric Acids; Piranha-Etch; De-Ionized Water; Ozone; Ammonium Hydroxide; Isopropyl
Alcohol; Chromium Phosphate; and, Organic Solvent Base Photo-Resist Strips.
1.2 Configuration
For the detectors listed in Table 1-1 Model Configurations, both the Fire and Fault Relays can
be connected as either normally open (N.O.) or normally closed (N.C.) operation using the flying
pigtail leads coming from the detector. N.C. and N.O. refers to the relay’s configuration during
normal operation.
Table 1-1 Model Configurations
Model
Fire Relay
Fault Relay
Sensor Self-Test
DCR1-CS1
N.O. or N.C.
N.O. or N.C.
No
DCR1-CT1
N.O. or N.C.
N.O. or N.C.
Yes
Note: Per NFPA 72 integrity requirements, a Normally Opened fire relay with supervision must be
used when a flame detector is connected to a fire alarm panel initiating device circuit.
1.3 Scope
Unless otherwise specified in this document, the words “detector(s),” “flame detector(s),”
“device(s)”, “DCR1” and/or “DCR1-C” all refer collectively to the various models listed in
Table 1-1 Model Configurations.Devices may also be referred to by only their extension with
the “DCR1” name excluded, for example “-CS1” instead of “DCR1-CS1.”
1.4 Description
All DCR1 detectors specified in this manual are calibrated to respond to a 4-inch Isopropyl
Alcohol (IPA) fire at 12 feet on axis within 3 seconds and have a clear 120° Conical Field-of-View.
All DCR1 electronics are factory sealed inside a housing made of polypropylene, which meets UL
94 Flammability Rating V0 (FRPP). In addition, sapphire windows and FEP jacketed cabling are
used to ensure the greatest chemical compatibility and to allow control panels and other fire
protection systems that are compatible with Dry “form C” contacts to be easily connected.
Designed and tested to comply with the EN 60529 IP67 standard, the DCR1 provides protection

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against a wide variety of acids and solvents, thereby making it an excellent choice for use in
semiconductor manufacturing tools and interior spaces of production and cleaning equipment.
In addition, all models of the DCR1 are approved for installation in Class 1 Division 2 Groups A,
B, C, D T4 hazardous locations, such as gas cabinets.
DCR1-CT1 detectors incorporate a UV Self-Test, which tests the integrity of the UV Sensor. A
fault is generated when a compromise has been detected.
Using a factory approved interface box and software a trained technician can retrieve the pre-fire
spectral data (FireScape™.) This data is recorded when the detector enters Fire Mode. The Fire
Relay can be programmed for either latching or non-latching operation. When non-latching
operation is chosen, the amount of time the detector waits before unlatching can be modified to
meet specific application needs. In Latching Mode, it is important to note that a FireScape™
cannot be overwritten until a detector is power cycled. In Non-latching Mode FireScape™ data
will be overwritten if another fire event occurs after the device returns to Normal Mode.
1.5 Fault Diagnostics
The microprocessor in the DCR1 series of detectors looks for fault conditions that could impair
the detector’s ability to accurately detect a flame and declare an alarm. By continuously
monitoring many of the detector’s key metrics and systems (i.e. input voltage, sensor circuits,
relay circuits, internal temperature, defined calibration constants, etc.) the DCR1 can detect the
occurrence of fault conditions.
2 OPERATION
2.1 General
When power is applied to a detector, it begins by checking and displaying both the model and
latching configurations. Next, the detector is initialized, and a series of self-tests are performed to
ensure the detector is functioning properly. Upon successful completion of Power Up Mode, the
DCR1 will go into Normal Mode (which means it is ready to detect a fire.)
2.2 Field-of-View
DCR1 detectors have a 120° Field-of-View. In order to
declare an alarm, a detector must be able to “see” a fire.
Any obstruction between the detector and the threat area
will impair the detector’s ability to cover the threat area
effectively. An obstruction is considered as anything that is
not transparent to the energy being detected.
Note:A DCR1’s sensors are not able to detect the spectral energy produced by a fire through
most types of glass or plastic. This may include glass or plastic that is visually transparent.
To provide coverage to a large area, multiple detectors should be used with overlapping Field-of-
Views (FOV.) Flame detectors should not normally be located so that they are looking down as
the products of combustion may stratify in the enclosed volume. Such stratification may severely
impact the detector's ability to respond to a fire.
Figure 2-1 Field-of-View

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2.3 Range
The range of the DCR1 is a function of the degree of obstruction, presence of spurious energy
sources, type of fire, position of the fire, fire size and rate of fire growth. As illustrated in
Figure 2-1, the response is affected by the angle at which the fire is located from the face of the
detector. For example, a 1 square foot Heptane fire on axis can be detected at 40 feet, whereas
the same fire located 60° off axis will be detected at approximately 20 feet. The type of materials
that constitute the threat will also affect the detector’s range. Different materials and
environmental conditions produce different amounts of the radiant energy, which is used by the
detector to “see” the fire.
2.4 Environment
Optical flame detectors sense radiant energy at some frequency or frequencies within their Field-
of-View. Any source that radiates energy at the same frequency or frequencies used by the
detector to sense a fire may impact the detector’s ability to “see” the fire. The DCR1 uses a UV
sensor (180 – 260 nm) and an IR sensor (0.715 to 3.5 microns.) Care should be taken to
minimize radiant energy sources within the detector’s Field-of-View. Because of the variety of
environments and conditions, a qualified P.E. may need to be consulted before deciding on the
location of the devices.
2.5 Configuration Settings
The DCR1-C is capable of being configured for either latching or non-latching operation using a
factory approved interface box and GoSierra™ computer software.
2.5.1 Latching Controls
DCR1-C devices allow for the detector’s fire relay to be set for either latching (factory
default) or non-latching operation.
In Latching Mode, the detector and its outputs will remain in the triggered state after
entering Fire Mode and stay that way until the detector is reset by cycling power. The
FireScape™ data for the fire event is stored in the detector’s non-volatile memory and
cannot be overwritten until the detector is power cycled.
In Non-latching Mode, the detector and its outputs will reset after 5 seconds (factory
default) of a flame no longer being detected and the detector will return to Normal Mode.
It is important to note that the non-latching time delay is programable should it be
required. Because a non-latching DCR1 returns to Normal Mode, the FireScape™ data
stored from a fire event will be overwritten should the device return to Fire Mode.
2.6 LED Operation, Detector Modes & FireScape™ Function
The status of a DCR1 can be determined from the two LEDs located on the face of the detector.
All DCR1 detectors have four standard modes: Power Up, Normal, Fault and Fire. The LEDs will
flash in specific patterns to indicate the detector’s status.

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2.6.1 Power Up Mode (Detector Reset)
When power is applied or recycled to a DCR1
detector, it enters Power Up Mode. Upon entering
Power Up Mode, all internal flags and triggers are re-
initialized and self-tests are initiated to ensure the
proper operation of the detector’s systems. In
addition, both red LEDs will begin flashing 2
sequential patterns, thereby providing a quick visual
representation of the model type and latching
configuration.
The first flash pattern indicates the model type. LED 1 will illuminate while LED 2 flashes
one time to identify that it is a DCR1-CS1 device. For -CT1 detectors, LED 2 will flash
two times rather than one time. Once complete, both LEDs will turn off.
The second flash pattern indicates whether a device is configured for latching or non-
latching Fire Relay operation. Again, LED 1 will illuminate, followed by LED 2 flashing
once to indicate the device is set to latching and twice to indicate non-latching. Once
complete, both LEDs will turn off.
When Power Up Mode has successfully completed, the DCR1 should go into Normal
Mode to indicate that the detector is ready to detect a fire.
2.6.2 Normal Mode
In Normal Mode, both LEDs will simultaneously flash briefly every 8 seconds. When a
detector is in Normal Mode it is constantly monitoring the environment and ready to
detect a fire. If a detector goes into a different mode, the appropriate output is triggered
and the “flash every 8 seconds” LED indication is suspended until the detector returns to
Normal Mode.
2.6.3 Fire Mode
When a DCR1 declares a fire, the Fire Relay energizes and both red LEDs on the face
of the detector (see Figure 2-2) come on and stay lit.
If the device was programmed (factory default) for latching operation, and a fire is
declared, the detector will remain in Fire Mode until the detector is reset by cycling
power.
For non-latching detectors, once the fire falls below the acceptable threshold, the
detector will return to Normal Mode after a period without reinitiating Power Up Mode
(factory default is 5 seconds.) It is important to note that once a non-latching device
returns to Normal Mode, the FireScape™ data stored in the detector’s memory will be
overwritten upon any subsequent fire event.
2.6.4 Fault Mode
When powered on, the DCR1 continuously monitors several of its internal systems to
ensure proper functionality is maintained. When a fault is detected, the device enters
Fault Mode and de-energizes the Fault Relay. The two LEDs on the face of the detector
(see Figure 2-2) provide a visual indication to help identify the type of fault being
reported (see TROUBLESHOOTING.) Only the highest numbered fault is indicated by
Figure 2-2 LEDs

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the LEDs. If the fault condition is corrected the next highest fault will be indicated until
all faults are cured. Please note that although Fire Mode is designed to override a fault
indication, some faults, such as “Program Failure” may prevent the reporting of a fire.
2.6.5 FireScape™ Function
When a DCR1 enters Fire Mode, the pre-fire spectral data is stored so it can be
retrieved for evaluation and analysis. For latching devices, the internal trigger for
FireScape™ is initialized during Power Up Mode and, once a FireScape™ has been
triggered by a device that has gone into Fire Mode, it cannot be retriggered until the
device is reset by cycling power. This allows the FireScape™ data to be captured and
stored when the detector goes into Fire Mode.
For non-latching devices, the internal trigger for FireScape™ is reset internally once the
device returns to Normal Mode. This means that if a device reenters Fire Mode, the new
pre-fire spectral data will be stored with the original data being overwritten. This allows
for only the latest pre-fire spectral data to be stored.
To retrieve the data, a trained technician must use a factory approved interface box and
GoSierra™ software, in conjunction with a computer, to communicate with the detector.
2.7 Outputs
The DCR1 has industry standard relay outputs for Fire and Fault. The 14-conductor pigtail cable
is provided to connect the detector to most control panels and/or other fire protection systems
that are compatible with Dry “form C” contacts.
Note:All DCR1 detectors are factory sealed. This means all internal relay and wire connections
cannot be modified or changed.
2.7.1 Fire Relay
DCR1 devices provide connections to either the N.O. or N.C. contacts of the Fire Relay.
There two sets of wires for N.O., N.C. and Common contacts (see Table 8-1 Wiring
Connections).
The Fire Relay energizes when a fire is declared. For latching devices, the relay will stay
energized until the detector is reset by cycling power. For non-latching devices, the relay
will stay energized until the detector no longer detects the presence of a fire for a period
at which time the detector will exit Fire Mode.
Note: Per NFPA 72 integrity requirements, a Normally Opened fire relay with supervision
must be used when a flame detector is connected to a fire alarm panel initiating device
circuit.
2.7.2 Fault Relay
When a DCR1 is powered on, the Fault Relay is energized. There should be continuity
between the N.C. and Common contacts. Conversely, there should be no continuity
between N.O. and Common contacts. When a fault occurs, the condition of the relay is
reversed. This means the Fault Relay reports a fault state if the detector loses power.
See Table 8-2 Faults. To determine the type of fault being reported, see Section 5.2.

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3 INSTALLATION
3.1 General Precautions
All wiring and installation should be done in accordance with the NFPA 70 and 72 standards and
must comply with any codes specific to the application or location. Contact the local authority
having jurisdiction and, if applicable, the company safety engineer, for information on codes
which may apply.
3.2 Housing
All DCR1 electronics are factory sealed inside an IP67 rated housing made of polypropylene,
which meets UL 94 Flammability Rating V0 (FRPP). In addition, all models of the DCR1 are
approved for installation in Class 1 Division 2 Groups A, B, C, D T4 hazardous locations. If the
factory seal is broken or if the cable gland connector is not properly installed and/or tightened, the
IP67 and/or hazardous location ratings will be void and any resulting damage is not covered
under factory warranty.
3.2.1 Mounting the Housing
The housing should be mounted by using the bracket located on the back of the detector
(see Figure 7-1.) The detector should be mounted securely to a flat surface and the
mounting location must be strong enough to support the weight of the detector. The best
orientation of the detector is with the connector pointed down so debris and/or fluids fall
away from the connector. Remove the bracket from the housing by sliding the bracket
down. The bracket may be welded (plastic weld) or screwed to the mounting surface. All
mounting hardware should be compatible with the agents that may be found in the
environment. For applications that require the detector to be pointed at a specific area, a
mounting adapter may be used (see “Accessories” document.)
Although the DCR1 is not overly sensitive, it should not be exposed to excessive
vibration as it may damage its components and will void factory warranty. The detector
has been tested to FM’s Approval Standard Class 3820, Sept. 1979 (.022” displacement,
10 Hz to 30 Hz sweep cycled at 2 CPM for 4 hours.)
3.2.2 Cabling
DCR1 detectors have a 14-conductor pigtail cable that is FEP jacketed. The cable
should be cut to fit the needs of the application. However, once the cable is cut it can
only be replaced at the factory if a longer length is required, which is not covered under
warranty.
3.3 Wiring Connections
With power turned off, all wiring connections should be made to a control panel or junction box
using the pigtail cable. See Table 8-1 for proper wiring configuration of the specific model being
installed.
Extreme care should be taken to ensure all wiring is properly connected to the correct terminals
before powering the device on. Using the device in excess of its listed specifications or miswiring
the device could result in serious damage to the device and/or control panel and will void the
factory warranty.
Note: To maintain the IP67 rating, extreme care must be taken to ensure all connectors are
adequately tightened and strain is not placed on the connector ends. Failure to prevent fluid from

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entering the detector housing may result in damage to the detector and is not covered under
factory warranty.
3.3.1 Power
Power to the DCR1 detector is supplied via the Red and Black wires at the end of the
cable. With the power supply turned off, connect the Black wire to the negative side of
the power supply and the Red wire to the positive side of the power supply (typically 24
VDC.) Check the controller manufacturer's manual for proper connection points.
Table 3-1 Color Codes for Connecting Power
Wire Color
Function
Model
Black
V-
All Versions
Red
V+ (typically 24 VDC)
All Versions
Note: Exceeding the specified input voltage rating for the detector will result in a High
Voltage fault. This type of fault is a permanent condition and the detector must be sent
back to the factory for evaluation. The evaluation, as well as any resulting damage to the
detector, is not covered under factory warranty. Conversely, if insufficient power is
applied to a detector, the device will report a Low Voltage Fault, which is user
correctable.
3.3.2 Fire Relay
The Fire Relay can be connected to a control panel as either N.O. or N.C. Per NFPA 72
integrity requirements, however, a Normally Opened fire relay with supervision must be
used when a flame detector is connected to a fire alarm panel initiating device circuit.
Table 3-2 Color Codes for Fire Relay
Wire Color
Fire Relay Function
Blue
Common
Brown
Common
Yellow
Normally Opened
Orange
Normally Opened
Red / Black
Normally Closed
White / Black
Normally Closed
For a typical installation on a fire alarm panel initiating device circuit (see Figure 7-3
Typical Wiring Connections), connect the Blue wire to one side of the Fire Signal
Circuit and the Orange wire to the other side of the Fire Signal Circuit. Next, connect the
Brown wire to the Blue wire of the next detector and the Yellow wire to the Orange wire
of the next detector in the chain. Finally, connect an EOL resistor (if used) across the
Brown and Yellow wires on the last detector in the chain. The Fire Relay wires are not
polarized. The Blue and Brown wires are connected internally to one side of the Fire
Relay and the Orange and Yellow wires are connected internally to the other side of the
Fire Relay. Refer to the controller manufacturer's manual for proper connection points
and value of the EOL resistor, if required.
3.3.3 Fault Relay
When a DCR1 is powered on, the Fault Relay is energized. There should be continuity
between the N.C. and Common contacts. Conversely, there should be no continuity

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between N.O. and Common contacts. When a fault occurs, the condition of the relay is
reversed. This means the Fault Relay reports a fault state if the detector loses power.
Table 3-3 Color Codes for Fault Relay
Wire Color
Fault Relay Function
White
Common
Tan
Common
Green
Normally Closed
Pink
Normally Opened
For a typical installation where the Fault Relay is Normally Closed when turned on (see
Figure 7-3 Typical Wiring Connections), the Fault Relay is connected using the White
and Green wires at the end of the pigtail. Connect the White wire to one side of the Fault
Signal Circuit and the Green wire to the other side of the Fault Signal Circuit or to the
Green wire of the next device if detectors are being daisy chained. The Fault Relay wires
are not polarized.
3.3.4 Communications
For proper use of communications, please refer to the appropriate GoSierra™ software
supplement.
Table 3-4 Color Codes for Communications
Wire Color
Communication Function
Purple
RS485 A
Gray
RS485 B
3.4 Testing
DCR1 installations should be inspected and tested in accordance with NFPA 72 standards and/or
any codes specific to the application or location. Contact the local authority having jurisdiction
and, if applicable, the company’s safety engineer, for information on specific testing requirements
and recommended frequency.
Functional testing a DCR1 will cause the detector to enter Alarm Mode. Therefore, if the detector
is connected to an extinguishing system, the outputs to the system should be disconnected prior
to testing to avoid accidental discharge.
The DCR1 can be tested with a pan fire, a lighter or a factory approved handheld test source (see
“Accessories” document.)
3.4.1 Pan Fire Testing
To test a detector with a pan fire, use a 4-inch diameter pan with isopropyl alcohol set no
more than 12 feet away. The detector should alarm within a few seconds of the fire
becoming fully involved.
3.4.2 Alternate Fire Testing
For functional testing, use a lighter with an approximate 1-inch high flame. Hold the
lighter approximately 2 feet directly in front of the detector’s face and wiggle it slightly
(approximately 2 – 4 Hz.) The detector should alarm within a few seconds.
Note: Because of the dangers involved with fire testing, the use of a factory approved handheld
test source (see “Accessories” document) is strongly recommended.

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3.4.3 Handheld Test Source Testing
Prior to using a factory approved handheld test source, it is important to check that the
battery is installed correctly and producing enough power to ensure proper operation
and maximum performance. In addition, a factory approved handheld UV detector (see
“Accessories” document) may be used to verify proper operation of the handheld test
source. To test a DCR1 using a handheld test source, hold the tester directly in front of
the detector’s face at the at an appropriate distance for the tester being used and
activate the device. The DCR1 should alarm within a few seconds.
3.4.4 Handheld UV Detector Testing
It is recommended to periodically use a factory approved handheld UV detector (see
“Accessories” document) to verify the UV sensor is not self-exciting due to blunt force,
excessive vibration or other damage.
After placing a detector into alarm with a handheld test source, cover the face of the
DCR1 and turn the handheld UV detector on to verify there are no other sources of UV
in the immediate area. Next, unblock the face of the DCR1 and point the handheld UV
detector directly at the face of the DCR1, holding it a few inches away, and turn the
handheld UV detector on. If the handheld UV detector detects UV, it is recommended
that further testing be conducted to verify the DCR1 UV sensor is operating properly.
4 MAINTENANCE
In addition to periodic testing as specified by the authority having jurisdiction, it is recommended to
occasionally clean the lenses of the DCR1 to remove any grease, dust or other particulates that may
hinder the detector’s ability to operate correctly.
4.1 Lens Cleaning
Regular cleaning of the DCR1 lenses is strongly recommended. The frequency of cleaning
depends on the cleanliness of the area where the detector is installed and mounted. An area
which has a lot of dust or oil particulates will require more frequent cleanings than an area with a
clean environment.
To clean the lenses, wipe the surface with a clean lint free cloth. If more extensive cleaning is
required, denatured or Isopropyl alcohol may be used with a clean lint free cloth. Do not use any
silica-based solvents, which can commonly be found in most glass cleaners, as this may damage
the lenses. Scratched and/or damaged lenses are not covered under factory warranty.

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5 TROUBLESHOOTING
If a problem is detected during installation or if the DCR1 enters Fault
Mode (see Section 2.6.4), the following procedures are
recommended. If the actions listed below do not correct the problem,
contact your distributor for further diagnostic instructions or to obtain
an authorization to return the detector for evaluation. For issues which
fall outside the scope of the factory warranty, charges may apply.
5.1 No LED blink or erratic LED blink
Once power is turned on and the detector is in Normal Mode,
the two red LEDs on the face of the detector (see Figure 5-1)
should blink simultaneously every 8 seconds. If they do not blink
or if they should begin blinking in an abnormal fashion, check the power connections to ensure
the Red wire is connected to positive and the Black wire is connected to negative on the power
supply. The voltage between the Red and Black wires should be within the input voltage
specifications (see Section 6.) Providing the detector is not indicating a fault condition and the
input voltage is correct, the detector should be returned to the factory for evaluation if the problem
persists.
5.2 Detector Indicates Fault
The DCR1, when powered on, continuously monitors several of its internal systems. When a fault
is detected, the device immediately enters Fault Mode and deenergizes the Fault Relay. In
addition, the two LEDs on the face of the detector provide a visual indication to help identify the
type of fault being reported (see Table 8-2.)
To determine the fault type, look at the two LEDs on the face of the detector (see Figure 5-1.)
LED 2 will illuminate briefly and then turn off. LED 1 will then begin blinking. The number of times
LED 1 blinks will indicate the Fault Type number. Once the fault type is indicated, LED 1 will turn
off and LED 2 will illuminate again. This cycle will continue until the fault condition is cured.
If multiple fault conditions are detected, only the highest numbered fault will be indicated on the
LED 1. If the fault condition can be corrected by the user, the next highest fault will be indicated, if
one exists. Once all faults have been cured, the DCR1 should enter Normal Mode.
To determine the best course of action to resolve a fault condition, use the Fault Type number to
reference the appropriate section below.
5.2.1 Fault Type 1 – “UV Self-Test Fault”
This fault only applies to detectors with the Optical Self-Test feature. Clean lenses per
Section 4.1. Reset the detector by cycling power. If the fault persists it may indicate a
bad UV sensor or source which will require factory service.
5.2.2 Fault Type 2 – “Program Failure”
There is an error in the firmware. There is no corrective action. Factory service is
required.
5.2.3 Fault Type 3 – “Calibration Fault”
Calibration settings are corrupted. There is no corrective action. Factory service is
required.
Figure 5-1 LEDs

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5.2.4 Fault Type 4 – “Low Voltage Fault”
The input voltage does not meet the minimum device specification. Measure the voltage
between the Red and Black wires and verify the voltage is within the input voltage range
(see Section 6.) If the voltage is inadequate, check the external wiring and power
supply. There should not be more than 1 Volt of AC ripple at 24 VDC. If the measured
voltage is within specification and there is no AC ripple, then factory service is required.
5.2.5 Fault Type 6 – “Relay Fault”
One or more of the relay coils are not functioning correctly. There is no corrective action.
Factory service is required.
5.2.6 Fault Type 7 – “High Voltage Fault”
The detector was exposed to a voltage that exceeded its listed specifications (see
Section 6.) There is no corrective action. Factory service is required.
Note:Using a device in excess of its specifications or miswiring a device could result in
serious damage to the device and/or control panel. Any resulting damage is not covered
under factory warranty.
5.2.7 Fault Type 8 – “Temperature Out-of-Range Fault”
The internal measured temperature exceeded listed specifications (see Section 6.)
There is no corrective action. Factory service is required.
Note: Any damage caused to a detector resulting from abuse or improper use, or from
exceeding its specifications, is not covered under factory warranty.
5.3 Detector Goes into Alarm but No Fire Appears to be Present
After a detector goes into alarm, the FireScape™ data can be retrieved and evaluated by a
trained technician using a factory approved interface box and software, in conjunction with a
computer, to determine if the spectral data that was recorded for the event correlates with an
actual fire signature (see Section 2.6.5.) In addition, a factory approved handheld UV detector
(see “Accessories” document) may be used to determine if there are any spurious UV sources in
the environment, which may have contributed to the alarm event (see Section 3.4.4.) For further
diagnostics and information, contact your distributor.
5.4 Detector Appears to Operate Normally but Will Not Alarm to a Fire or Test Source
Normally, both the LEDs on the front of the detector illuminate and the Fire Relay triggers when
the detector enters Fire Mode (see Section 2.6.3.) To determine if the detector is operating
normally, follow the procedure below.
Connect an ohmmeter across the Blue or Brown and Yellow or Orange wires (see Section 3.3.2.)
If the relay closes (0 ohms on the meter) and the LEDs come on, then the detector is operating
normally. Check external alarm initiating circuit wiring. If the relay closes and the LEDs remain off,
or the relay remains open and the LEDs come on, factory service is required. If the relay remains
open and the LEDs remain off, factory service is required.

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Page: 12 DCR1-C Flame Detector Models (11/2019)
6 SPECIFICATIONS
Sensitivity at 12 Feet on
Axis to a 4-Inch Diameter
IPA Fire:
3 Seconds or Less
Test Fuels: Heptane, Hydrogen, Silane, MEK, Polypropylene and Isopropyl
Alcohol
Chemical Compatibility: Resistant to Most Acids and Solvents
Field-of-View: 120° Full Cone (NFPA)
Sensor Responsivity: Ultraviolet: 185 to 260 nm
Infrared: 0.715 to 3.5 µm
Humidity Range: Up to 90%
Input Voltage: 12 to 32 VDC (Typically 24 VDC)
Current Draw: 40 mA Nominal (70 mA Max) Depending on Mode of Operation
and Device Status
Relay Outputs: 1.0 A @ 30 VDC Resistive
Temperature Range: Operating (Tamb): -40° C to 85° C
LEDs: 2 Red LEDs Display: Model, Fault Type and Status
Cabling: 22 AWG, 14 Conductor FEP Jacketed Cable
Enclosure: FR Rated Polypropylene (FRPP) Housing with Sapphire
Windows. EN 60529 IP67 Rated. Housing Meets UL 94
Flammability Rating V0
Hazardous Area
Classification:
Class 1 Division 2 Groups A, B, C, D T4
Class 1 Zone 2 Groups A, B, C, D T4
Housing Dimensions: 3.5 x 4.2 x 1.0 Inches
Approvals: FM 3260 and EN 60529
ETL Conforms to ANSI/ISA 12.12.01
CE (EMC 2014/30/EU) Conforms to EN 50130-4:2011

Installation Manual
DCR1-C Flame Detector Models (11/2019) Page: 13
7 APPENDIX A – FIGURES
Figure 7-1 DCR1 Housing Dimensions
Figure 7-2 DCR1 Layout (Sensors & LEDs)
UV Sensor
IR Sensor
LED 1
LED 2

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Page: 14 DCR1-C Flame Detector Models (11/2019)
Figure 7-3 Typical Wiring Connections