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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DCR1-C Flame Detector Models (11/2019) Page: 1
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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DCR1-C Flame Detector Models (11/2019) Page: 3
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