Det-Tronics C7052J UV-IR User Manual

NOTE

Not compliant to FM 3260 (2000).

APPLICATION

The R7495B/C7052J UV/IR Flame Detection System is
designed to provide continuous and automated fire pro­tection in applications where the use of ultraviolet (UV)
or infrared (IR) detectors alone can result in unwanted
(false) alarms. The R7495B/C7052J system features a
flame detector that uses both a UV and a single fre­quency IR sensing device mounted side-by-side on a
junction box assembly.

When used alone, a UV detector can respond to
sources of radiation besides fire, such as lightning, x­rays or arc welding. A UV detector does not respond to
the radiation emitted by flickering hot objects. Likewise,
an IR detector can respond to infrared radiation sources
besides hydrocarbon fires, such as flickering hot
objects. An IR detector does not respond to radiation
from lightning, x-rays or arc welding. Since both UV
and IR sensors respond to hydrocarbon fires but have
virtually no false alarm sources in common, the
R7495B/C7052J UV/IR system provides reliable flame
detection while being virtually immune to false alarms.

The detector junction box contains a power supply and
signal processing circuitry for the sensors. A fire signal
is generated in the detector junction box and sent to the
controller only when a fire is simultaneously detected by
both the UV and IR sensors. Since the two detecting
elements independently monitor different portions of the
radiation spectrum and have virtually no sources of out­put actuation in common besides fire, a high degree of
false alarm immunity is achieved. The controller contin-

uously monitors up to eight UV/IR detectors and ener­gizes the appropriate relay outputs in response to a fire
signal from the detectors. Fire relays are provided in
the controller: two instant (alarm) relays, two delayed
(fire) relays, and a system fault relay.

Typical applications include:

— Transport loading terminals
— Offshore drilling and production platforms
— Tank farms
— Refineries
— Butane and propane loading and storage
— Pipeline compressor stations
— Turbine enclosures
— Aircraft Hangars
— Paint Spray Booths
— Chemical and petrochemical production

DET-TRONICS

®

©Detector Electronics Corporation 2003 4/03 95-8302-02

INSTRUCTIONS

UV/IR Flame Detection System

R7495B Controller

C7052J Detector

*o

i

is Detector Electronics' Trademark for its patented Optical
Integrity Systems, U.S. Patent 3,952,196, United Kingdom Patent
1,534,969, Canada Patent 1,059,598.

2

FEATURES

• Controller continuously monitors up to eight detec­tors.

• Detectors can be divided into either two groups of
up to four detectors, each with its own alarm and
fire zone output, or one group of up to eight detec­tors with two alarm and two fire zone outputs.

• Two fire zone relays, two alarm relays and a fault
relay provided.

• Ignores false alarm sources such as arc welding, x­rays, gamma radiation and radiation from flickering
hot objects.

• Fast response - typically 1 to 5 seconds for an
intense hydrocarbon fire.

• Field adjustable sensitivity and time delay.

• Front panel LEDs indicate fire response and fault
conditions.

• Microprocessor control provides continuous diag­nostics and automatic fault indication.

• Automatic Optical Integrity (o

i

) for both UV and IR

sensors.

• Explosion-proof (flame-proof) detector housing

•FM approved, CSA and BASEEFA/CENELEC certi­fied.

• Voting circuitry for improved false alarm rejection.

SYSTEM DESCRIPTION

Detector

The C7052J UV/IR Flame Detector is an explosion-proof
device that consists of a UV sensor and an IR sensor
mounted side-by-side on a junction box. This mounting
arrangement allows both sensors to monitor the same
hazardous location with a 80 degree cone of vision. Up
to eight C7052J Detectors can be connected to one
R7495B Controller.

The UV sensor responds to high energy radiation with
wavelengths from .185 to .245 microns (1850 to 2450
angstroms). See Figure 1. It detects radiation from
sources such as fire, arc welding, lightning, x-rays and

gamma rays. However, it is not sensitive to radiation
from the sun or radiation from flickering hot objects
(blackbodies).

The IR sensor is sensitive to IR radiation over the range
of 4.2 to 4.7 microns. See Figure 1. It is not sensitive to
radiation from the sun, lightning, x-rays, gamma rays, or
arc welding. However, it will respond to fire and flicker­ing blackbody (heat) radiation sources. IR radiation that
is generated by a hydrocarbon flame which reaches the
detector in pulsations or “flicker.” These pulsations are
present in all flames and are created by turbulent mix­ing of fuel with air. For this reason, electronic circuitry in
the detector monitors the output of the IR sensing ele­ment for the appropriate amplitude and a flicker fre­quency between 1 and 16 cycles per second. If both
the radiation and flicker requirements are met, a fire sig­nal is generated. This dual criteria for the IR detector
results in increased reliability. However, since the IR
detector responds only to hydrocarbon fires, the UV/IR
detector cannot respond to non-hydrocarbon fires such
as burning hydrogen, ammonia or metal.

The detector junction box contains a +290 vdc power
supply for the UV sensor as well as circuitry to process
signals from both sensors. When both sensors detect a
fire, the IR sensor activates the circuitry in the junction
box to allow the signal from the UV sensor to be sent to
the controller. By using both a UV and an IR sensor, the
C7052J is able to discriminate virtually all false alarm
sources from a true hydrocarbon fire.

o

i

Feature

Both sensors are equipped with the automatic Optical
Integrity (

o

i

) test feature. This patented system assures
proper operation of the detector by checking the clean­liness of the optical surfaces, sensitivity of the sensors,
and proper functioning of the electronic components of
the detector once every minute. If a problem should
occur, it is quickly detected. The

o

i

test is accom­plished without the use of an external UV or IR source.
To minimize the possibility of nuisance fault signals, the
detector must fail the automatic

o

i

test three consecu-

tive times for an

o

i

fault signal to be generated.

The

o

i

test is initiated by a signal from the controller

which causes actuation of the

o

i

test lamps. A calibrat-

ed low level test beam is generated by the

o

i

test

Figure 1—Detector Sensitivity Range

100

ATMOSPHERIC

TRANSMISSION

ULTRAVIOLET SENSOR RESPONSE

75

50

25

0

ULTRAVIOLET

SOLAR RADIATION REACHING THE EARTH

VISIBLE INFRARED

WAVELENGTH (MICRONS)

INFRARED SENSOR RESPONSE

5.04.03.02.01.51.00.90.80.70.60.50.40.30.20.1

A1516

lamps, as shown in Figure 2. Although the test lamps
are mounted in the same enclosure with the sensor, an
optical shield prevents the test beam from reaching the
sensor directly. The test beam travels out through the
viewing window, where it encounters the reflective

o

i

ring and is directed back through the window to the
sensor. Electronic circuitry in the detector then evalu­ates the return signal from the sensor and generates the
appropriate output response. Since the test beam must
pass through the same portion of the viewing window as
radiation produced by a fire, this test of the ability of the
detector to “see” a flame has a high degree of reliability.

Detector Enclosure

The C7052J features an explosion-proof, dust-tight, and
water-tight (NEMA 4/IP66) housing that is designed for
installation in hazardous locations in both indoor and
outdoor environments. The enclosure is FM approved,
CSA certified, and BASEEFA/CENELEC approved.

Controller

The R7495B is designed for use with 24 volt dc power
supplies, but will operate from any direct current supply
between 18 and 32 volts. The unit will tolerate tran­sients such as those that can occur when fully dis­charged batteries are placed on charge. When power
is present at the R7495B Controller, it is indicated by a
continuously energized green LED. All other lights and
displays on the R7495B front panel are normally off, but
may be periodically checked for operation by pressing
the RESET/LAMP TEST button located directly below the
POWER light as illustrated in Figure 3. It is not neces­sary for the controller to be in the TEST mode when this
check is performed.

With power applied and the TEST/NORM toggle switch
in the normal mode, the R7495B Controller continuously
cycles through the Automatic Optical Integrity test (see
the “

o

i

Feature” section), checking each detector and
its wiring. At the same time, it monitors the system for
any status changes, such as a fault, a “fire” signal from
one of the detectors or zones, or a change in the setting
of the TEST/NORM toggle switch. If a status change
occurs, the controller will respond accordingly by indi­cating the change on the front panel LEDs and generat­ing the appropriate output.

Front Panel

The front panel of the R7495B provides switches for
selecting mode of operation and resetting the controller.
It also provides LEDs for indicating system status infor­mation. Figure 3 illustrates the front panel of the con­troller.

3 95-8302

Figure 2—o

i

Function within th e Detector

Figure 3—R7495B Controller Front Panel

UV TEST LAMP

OPTICAL SHIELD

UV DETECTOR

SNAP-IN oi RING

o

SNAP-IN

3

5

POWER LED

RING

i

ALARM LED

A1703

VIEWING WINDOW

IR TEST LAMP (2)

IR SENSING ELEMENT

IR DETECTOR

OPTICAL FILTER

VIEWING WINDOW

UV SENSOR

DETECTOR LEDS

FIRE ZONE LEDS

FAULT LED

RESET/LAMP TEST

MODE SWITCH

4

PUSHBUTTON

B1048

1

2

6

7

1. A DETECTOR LED for each channel provides an
immediate visual indication that a fire has been
detected. The LED blinks slowly (once per second)
if the fire intensity does not exceed the fire thresh­old and blinks rapidly if a fire output is generated.
Steady illumination indicates that the fire intensity
has returned below the alarm threshold (i.e., fire has
been extinguished).

2. The FIRE ZONE LEDs signal actuation of the corre­sponding Fire (timed) relay outputs.

3. Illumination of the ALARM LED indicates actuation
of an Alarm (instant) relay output.

4. Illumination of the FAULT LED indicates a system
malfunction (in Normal mode).

5. The POWER LED is illuminated when power is
applied to the system.

6. The RESET/LAMP TEST button illuminates all LEDs
for testing and also resets the system. While the
button is depressed, the outputs are disabled. This
will cause a fault condition until the controller
restarts (approximately two seconds).

11. The TEST/NORM toggle switch selects NORMAL or
TEST mode.

Normal Mode

In the Normal operating mode, the R7495B Controller
monitors the outputs of all detectors connected to it and
compares the detector output signals to field adjusted
settings (refer to the “STAR Logic Programming” proce­dure in the “Programming the Controller” section) to
determine whether a fire condition exists. Diagnostic
circuitry continuously checks the system for wiring con­tinuity as well as faults that could prevent proper
response to a fire through the Automatic

o

i

feature. The
Fire Zone (timed) and Alarm (instant) relays are normally
de-energized. The Fault relay is normally energized, as
long as no system malfunctions are detected. Only the
POWER LED is illuminated.

Resetting the Controller

Any existing system status indications and the controller
outputs are returned to normal operating condition with
all LEDs except the POWER LED off, and all relays
except the Fault relay de-energize (after the radiation
source is removed or the fault is corrected) in one of the
following ways:

1. Depress the RESET/LAMP TEST button.

2. Place the mode switch in the TEST position, then
return it to NORMAL.

3. Close the optional remote reset switch connected
between terminals 31 and 32.

Programming Switches

Rocker switches that are located on the side of the con­troller are used for selecting various options available
with the R7495B. These programming options are listed
below and must be set prior to system operation. Refer
to the “Programming the Controller” section of this man­ual for detailed instructions.

1. Number of detectors connected to the controller (up
to eight)

2. Gate Length, Consecutive Gate Selection, Count
Selection (system sensitivity and time delay).

3. Detector Grouping/Voting Logic

4. Latching/non-latching outputs.

Detector Grouping

The microprocessor-based circuitry in the controller
requires that the detectors be “grouped” into detection
zones. Two options are possible:

Separate - Two independent groups consisting of up to
four detectors each (channels 1 to 4 and channels 5 to

8) can energize an Alarm and a Fire Zone output.

Combined - All eight channels make up a single detec­tion zone, with both Alarm outputs and/or both Fire Zone
outputs being actuated simultaneously.

Alarm Outputs

Two Alarm relays are provided for controlling external
fire response devices. If any of the detectors in the
group detects a fire that exceeds the gate length, con­secutive gates, and count selection requirements.

1. One or both of the Alarm relays is energized.

2. Actuation of an Alarm relay is indicated by illumina­tion of the ALARM LED on the front panel of the
controller.

3. The detector(s) responding to fire is identified by
illumination of its corresponding DETECTOR LED.

Fire Zone Outputs -

If the combination of detectors

responding to fire satisfies the pre-programmed voting

4

requirements, actuation of one or both of two Fire Zone
outputs will also occur. If the controller is programmed
for two separate zones, an output is generated if the
selected number of detectors in the group (one or two)
responds to fire. If an eight detector group is pro­grammed, the controller energizes both Fire Zone out­puts if fire is detected by the selected minimum number
(one to four) of detectors.

This voting feature allows different combinations of
detectors to fulfill the logic requirements, and provides
the best balance between dependable fire detection
and freedom from false alarms. Actuation of a Fire Zone
output is signaled by illumination of the appropriate
FIRE ZONE LED on the controller.

Ext Reset/Inhibit

Connecting a switch between terminals 31 and 32
allows the controller to be reset or inhibited from a
remote location (close switch to inhibit/reset).

Fault Detection

The R7495B/C7052J system uses the Automatic oi fea­ture to continuously check the cleanliness of the detec­tor viewing windows and sensitivity of the sensors. In
addition, automatic diagnostic circuitry in the controller
monitors the system for wiring continuity faults as well
as other malfunctions that could prevent the system
from responding in the event of a fire. If a fault is
detected:

1. The normally energized Fault relay is de-energized.
This relay is typically used for controlling an exter­nal fault annunciation device or removing power
from a hazardous process.

2. The FAULT LED on the front panel of the controller
is illuminated to provide a visual indication that a
system fault has occurred.

Field Wiring Connector

The R7495B Controller is furnished with a field wiring
connector backplate that incorporates pressure type
screw terminals for connecting the external wiring. The
use of a Q4004 Mounting Cage is recommended for
mounting the controller. The controller is designed for
installation in a non-hazardous area.

SPECIFICATIONS

SPECTRAL SENSITIVITY RANGE—

UV: The UV sensor responds to radiation over the range

of 0.185 to 0.245 microns (1850 to 2450
angstroms).

IR: The single frequency infrared sensor responds to

radiation between 4.2 and 4.7 microns.
Figure 1 illustrates the spectral response range of the
UV and IR sensors.

CONE OF VISION—

The C7052J has a 80 degree cone of vision with the
highest sensitivity lying along its central axis. See
Figure 4.

FLAME SENSITIVITY—

The C7052J5 with a part number DE5500 IR Sensor
Module (the sensor part number is printed on its side)
detects a 1 foot by 1 foot gasoline fire at 50 feet, a 2 foot
by 2 foot JP4 fire at 100 feet, and a 10 foot by 10 foot
JP4 fire at 150 feet.

The C7052J with a part number DE3895 IR Sensor
Module (the sensor part number is printed on its side)
detects a 1 foot by 1 foot gasoline fire at 35 to 45 feet, a
2 foot by 2 foot JP4 fire at 100 feet, and a 10 foot by 10
foot JP4 fire at 150 feet.

RESPONSE TIME—

The response time of the detector is a function of fuel,
fire size, distance, orientation of the fire source and the
field programmable controller settings. With typical
controller settings of 0.25 second gate length, 4 counts
per gate, and 4 consecutive gates, the system will
respond to an intense fire signal in less than 2 seconds.

Response times of less than 1 second to an intense fire
signal can be achieved by setting the controller for a

0.125 second gate length, 2 counts per gate, and 3
consecutive gates.

INPUT VOLTAGE—

Controller and Detector
24 vdc nominal (18 vdc minimum, 32 vdc maximum)
with less than 1 volt of ripple.

5 95-8302

Figure 4—Cone of Vision

100% REPRESENTS THE MAXIMUM DETECTION DISTANCE FOR A

GIVEN FIRE. THE SENSITIVITY INCREASES AS THE ANGLE OF

30°

45°

A1461

INCIDENCE DECREASES.

15°

DETECTION

DISTANCE

(PERCENT)

0°

100

90

80

70

60

50

40

30

20

10

15°

30°

45°

POWER CONSUMPTION—

Controller: 1.5 watts typical, 3.5 watts maximum.
Detector: 1.0 watt typical, 3.5 watts maximum.

RELAY CONTACT RATINGS—

3 amperes at up to 30 vdc or up to 240 vac

CONTROLLER TEMPERATURE RANGE—

Operating: +32°F to +140°F (0°C to +60°C)
Storage: –40°F to +140°F (–40°C to +60°C)

DETECTOR TEMPERATURE RANGE—

Operating: –40°F to +167°F (–40°C to +75°C).
Storage: –67°F to +185°F (–55°C to +85°C)

DETECTOR HUMIDITY RANGE—

0 to 95% relative humidity.

DETECTOR ENCLOSURE MATERIAL—

Copper-free aluminum (red) or 316 stainless steel, with
optional stainless steel mounting bracket.

DETECTOR ENCLOSURE RATINGS—

FM approved and CSA certified for Class I, Groups C
and D, and Class II, Groups E, F, and G hazardous
locations. NEMA 4 enclosure. BASEEFA/CENELEC
certified flame-proof for EExd IIB T6; IP66 enclosure
rating.

RFI/EMI HARDENED—

Detector designed to meet RFI and EMI immunity
requirements of MIL STD 461, 462, and 463.

DIMENSIONS—

See Figures 5, 6, 7 and 8.

SHIPPING WEIGHT—

R7495B Controller:

4.4 pounds (2.0 kilograms)

C7052J Detector:

Aluminum: 6.0 pounds (2.7 kilograms)
Stainless Steel: 14.0 pounds (6.4 kilograms)

6

Figure 5—Detector Dimensions in Inches (MM)

Figure 6—R7495 Controller Dimensions in Inches (MM)

Figure 7—Mounting Base Dimensions

3.38 (85.8 MM) 7.11 (181 MM)

2.5 DIA.
(64 MM)

7.81

(198 MM)

5.25

(133 MM)

C1047

10.0 (254 MM)

B0906

CONDUIT ENTRY 3/4 NPT OR 25 MM

2.0

(50 MM)

7.0

(177 MM)

A1305

2–1/2 (64 MM) DIA.

° ± 2° (2)

120

0.25 (6.4 MM)
DIA. (3)

2.00 (50.8 MM) DIA.

OPTIONS

Power supplies are available for operating the R7495B
and C7052J from line (mains) voltage.

Q4004 Mounting Cage is designed for holding up to
eight micro-module devices and is recommended for
ease of installation and servicing. Mounting cages that
hold fewer modules are also available. Optional filler
panels (part number 002188-001) can be used to cover
unused sections of the mounting cage.

Locking devices must be used on detector housings to
comply with applicable regulations in some areas
(BASEEFA/CENELEC).

Q1113 Air Shields for areas where there is an abnormal­ly high level of airborne contaminants. Two Q1113 Air
Shields are required for each detector.

Q9001G Swivel Assembly (part number 004404-001) for
easy mounting and sighting of detector assemblies.

RESPONSE CHARACTERISTICS

The response time of the detector is a function of fuel,
fire size, distance, orientation of the fire source and the
field programmable controller settings. As with all fire
tests, results must be interpreted according to the indi­vidual application, taking into account all possible vari­ables (see the Application Guidelines” section for a dis­cussion of of these factors).

Typical response distances of the C7052J Detector to
various fuels are listed in Table 1. Each liquid fuel fire
(acetone, diesel, gasoline, methanol, and toluene) con­sisted of approximately one pint of fuel burned in a 1
foot by 1 foot steel pan unless otherwise noted. The

excelsior (wood shaving) fire consisted of one pound of
wood shavings. The wood fire consisted of a 10-inch by
10-inch crib (wood stack). The methane fire was per­formed to FM standard, with the flame approximately 30
inches high and 6 to 8 inches in diameter. The detec­tors were sited to observe the fire at center axis ±10
degrees. The controller sensitivity and time delay set­tings were 4 counts per gate, 4 consecutive gates, and

0.25 second gate lengths.

APPLICATION GUIDELINES

Certain guidelines must be followed when using any
type of sensing device as a fire detector. This involves
not only recognizing the strengths and advantages of a
particular device, but also understanding its limitations.

It is also important to note that in any system that uses
two or more sensors to produce a fire signal, the detec­tor will be disabled should one of its sensors fail. The
Automatic Oi feature will warn of such failure. Routine
manual testing and checking of the system is recom­mended for increased system reliability.

Potential radiation sources in the environment must also
be carefully considered. A UV sensor will respond to
sources of UV besides fire, such as electric arc welding,
lightning, x-rays and gamma radiation. The C7052J has
been designed to ignore steady state infrared sources
that do not have a flicker frequency characteristic of a
fire, however, it should be noted that if these steady
state infrared sources are hot enough to emit adequate
amounts of infrared radiation in the response range of
the IR sensor and if this radiation becomes interrupted
from the view of the detector in a pattern characteristic
of a flickering flame, the IR sensor can respond. Any
object having a temperature greater than 0° Kelvin
(–273°C) emits infrared radiation. The hotter the object,
the greater the intensity of the emitted radiation. See
Figure 9. The closer the infrared source is to the detec­tor, the greater the potential for the IR sensor to produce

7 95-8302

JUNCTION BOX MOUNTING

Figure 8—Q9001G Swivel Mounting Bracket Dimensions

Table 1—C7052J Typical Response Distances

Fuel Distance from U7652
Acetone 45 feet (13.7 meters)
Diesel 40 feet (12.2 meters)
Gasoline 50 feet (15 meters)
Methane 35 feet (10.7 meters)
Methanol 35 feet (10.7 meters)
Toluene 50 feet (15 meters)
Wood Shavings (Excelsior) 50 feet (15 meters)
Wood Stack (Crib) 50 feet (12.2 meters)
JP4 (surface area)

2 ft

2

100 feet (30 meters)

4 ft

2

150 feet (45 meters)

10 ft

2

150 feet (45 meters)

BRACKET (ATTACHES
WITH TWO ENCLOSED
FLATHEAD SCREWS)

3/4 INCH NUT USED TO
SECURE DETECTOR
BRACKET TO SWIVEL MOUNT

1/2 INCH NUT USED TO ADJUST
ELBOW TO DESIRED ANGLE

5-1/4 INCHES

(133 MM)

1-3/8 INCH NUT USED TO ROTATE
SWIVEL/DETECTOR ASSEMBLY
TO DESIRED POSITION

MOUNTING BASE

2-1/2 INCHES

(64 MM)

B1303

an alarm. The IR sensor can respond to IR radiation
sources that can meet the amplitude and flicker require­ments of the detector such as vibrating hot objects.
Although the C7052J Detector is designed to reduce
false actuations, certain combinations of ambient radia­tion must be avoided. For example, if IR radiation with
an intensity that exceeds the fire threshold of the IR sen­sor should reach the detector as a flickering signal, and
if at the same time an electric arc welding signal also
reaches the sensors, an alarm output will be generated.

The C7052J ignores arc welding beyond 15 feet from
the detector. However, the UV sensor will respond to
the intense UV radiation generated by the arc welding,
and at distances closer than 15 feet the heated metal
from the welding can become a false alarm source for
the IR sensor.

Another important fact regarding a radiation detector of
any type is that radiation must reach the detector in
order for it to respond. Care must be taken to keep
physical obstructions out of the line of view of the detec­tor. In addition, UV or IR absorbing gases or vapors
must not be allowed to accumulate between the detec­tor and the protected hazard. See Table 2 for a listing
of these substances. Smoke will also absorb radiation,
therefore, the detector should not be mounted close to
the ceiling or other areas where smoke can accumulate.

It is important to keep the detector viewing windows as
free of contaminants as possible in order to maintain
maximum sensitivity and to assure proper operation of
the flame detection system. Commonly encountered
substances that can significantly attenuate UV and/or IR
radiation include, but are certainly not limited to, the fol­lowing:

Silicones
Oils and greases
Ice buildup
Dust and dirt buildup
Paint overspray

The

o

i

test feature is designed to register an

o

i

fault
when the detector sensitivity is reduced to approximate­ly 50% of its maximum detection range. For maximum
system reliability, it is recommended that the detector
viewing windows be cleaned on a regularly scheduled
basis. (Refer to the “Maintenance” section of this manu­al for additional information regarding detector mainte­nance.) The use of model Q1113 Air Shields can help
extend the time period between required maintenance.

The C7052J is designed to be resistant to interference
from EMI and RFI. It will not respond to a 5 watt walkie­talkie at a distance of greater than 1 foot.

8

Figure 9—Blackbody Spectral Emittance

The following is a partial list of compounds that exhibit
significant UV absorption characteristics. These are also
usually hazardous vapors. While generally of little conse­quence in small amounts, these gases can restrict UV
detection if they are in the atmosphere in heavy concen­trations. It should also be determined whether or not
large amounts of these gases may be released as a
result of a fire-causing occurrence.

Acetaldehyde Methyl Methacrylate
Acetone Alpha-Methylstyrene
Acrylonitrile Naphthalene
Ethyl Acrylate Nitroethane
Methyl Acrylate Nitrobenzene
Ethanol Nitromethane
Ammonia 1-Nitropropane
Aniline 2-Nitropropane
Benzene 2-Pentanone
1,3 Butadiene Phenol
2—Butanone Phenyl Clycide Ether
Butylamine Pyridine
Chlorobenzene Hydrogen Sulfide
1-Chloro-1-Nitropropane Styrene
Chloroprene Tetrachloroethylene
Cumene Toluene
Cyclopentadiene Trichloroethylene
O-Dichlorobenzene Vinyl Toluene
P-Dichlorobenzene Xylene

If UV-absorbing gases may be a factor in a given applica­tion, precautionary measures should be taken. Detectors
can be placed closer to the potential hazard area, and/or
the sensitivity of the detection system can be increased.
Contact the factory for further details.

Substances such as methane, propane, butane, hexane,
camphor and octane are not UV absorbing.

Absorption of infrared radiation in the range of 4.2 to 4.7
microns is not a significant problem with most organic
vapors, with the exception of those compounds that have
triple bonds such as acetylene, nitriles, silane, or iso­cyanates. Carbon dioxide concentrations higher than nor­mally present in the atmosphere can also cause substan­tial loss of fire detection sensitivity.

Table 2—Radiation Absorbing Gases and Vapors

4

10

4000°K

3

10

2

10

WATTS

2

1

10

(CM ) (MICRON)

1

–1

10

–2

10

–3

RADIANT EMITTANCE

10

–4

10

A0576

0.6 0.8 1 2 4 6 8 10 20 30

0.4

6000°K

2000°K

1000°K

500°K

WAVELENGTH (MICRONS)

300°K

250°K

The C7052J uses a single frequency IR sensing device
with detection limited to the hot CO2 emission peak,
therefore, it cannot be used to detect fires that do not
contain carbon, such as hydrogen, sulfur, burning met­als, or other non-hydrocarbons without thorough testing.

INSTALLATION

Detector Positioning

When determining the proper number and positioning of
detectors needed for adequately protecting any given
installation, it is essential to consider the cone of vision
of the detector. The C7052J Detector has a nominal 80
degree cone of vision with the highest sensitivity along
its central axis. Refer to Figure 4. Careful observation
of this graph reveals that at 50 percent of the maximum
detection distance, the cone of vision is still 80 degrees.
As the detection distance increases beyond 50 percent,
the cone of vision gradually decreases. For example,
the C7052J will detect a 1 foot by 1 foot gasoline fire at
50 feet. Therefore, we can assume that at 25 feet (50%
maximum distance) the cone of vision will be 80
degrees. If the fire increases in size, both the maximum
detection distance and the cone of vision at longer dis­tances will be increased.

It is also important to note that as the distance increases
between the detector and the fire source, the time need­ed for the detector to respond to a fire of a given size
also increases (fastest response requires maximum fire
signal). The intensity of the radiation reaching the
detector decreases with distance. For fastest response
time, locate the detector as close as possible to the
anticipated fire source.

The following recommendations should be observed in
designing or installing any fire detection system:

— Use enough detectors to adequately cover the pro-

tected area with overlapping cones of vision.

— For fastest response time, position the detectors as

close as possible to the anticipated fire source.

— Aim the detector as directly as possible at the antic-

ipated fire source.

— If possible, conduct actual flame tests to verify cor-

rect detector positioning and proper system opera­tion.

Whenever possible, the detector should be positioned
in a manner that will minimize the buildup of contami­nants on the viewing window and

o

i

ring. Substances
such as snow, ice, dirt, oil, paint overspray, and numer­ous other commonly encountered materials are capable
of attenuating UV or IR radiation and adversely affecting
detector response.

For outdoor applications, the detector should be aimed
downward to minimize the buildup of water or ice on
the detector viewing window and to prevent it from
scanning the horizon. This minimizes the response to
distant radiation sources outside the protected area.

The detector should not be placed where smoke can
obscure its view of the hazardous area. For indoor
applications, if dense smoke is expected to accumulate
at the onset of a fire, mounting the detector on a side
wall a few feet (1 meter) down from the ceiling will nor­mally allow enough time for the unit to respond before it
is affected by rising smoke. The detector should be
located where it can be easily accessed for periodic
maintenance, testing and cleaning.

Wiring Requirements

The system should be wired using four conductor
shielded cable, at least 18 gauge (1.024 mm diameter).
The length of cable should be considered when wiring
the system to ensure that a minimum input voltage of 18
vdc is present at the detector. The cable length should
not exceed 2000 feet. In applications where the wiring
cable is installed in conduit, the conduit should not be
used for wiring to other electrical equipment. Foil type
shielded cable is recommended to protect from electro­magnetic and radio frequency interference. When
using cables with shields, the shield should be insulated
at the detector and grounded only at the control cabi­net.

NOTE
It is important to use cable that is suitable for the
installation environment. In applications involving
high humidity or salt water, use a cable that is
made specifically for harsh, salt water environ­ments. In all cases, typical cable insulation resis­tance should be at least 100 megohms. If the
resistance drops below 10 megohms, the cable
could be deteriorating and should be replaced to
avoid shorting. When testing the insulation resis­tance, disconnect the leads from the detector/con­troller before connecting the megohmmeter (insula­tion tester) to the cable.

Since moisture can be detrimental to electronic devices,
it is important that moisture not be allowed to come in
contact with the electrical connections of the system.
Moisture in the air can become trapped within sections
of conduit, therefore the use of conduit seals is required
to prevent damage to electrical connections caused by
condensation within the conduit. These seals must be
water-tight and explosion-proof and are to be installed
even if they are not required by local wiring codes. A
seal must be located as close to the C7052J as possi­ble. In no case should this seal be located more than
18 inches (46 cm) from the unit. If a conduit swivel is

9 95-8302

used, the seal must be located between the swivel and
the detector. When an explosion-proof installation is
required, an additional seal must also be installed at
any point where the conduit enters a non-hazardous
area. When pouring a seal, the use of a fiberdam is
required to assure proper formation of the seal. The
seals should never be poured in temperatures that are
below freezing, since the water in the sealing com­pound will freeze and the compound will not dry proper­ly. Contamination problems can then result when tem­peratures rise above the freezing point and the com­pound thaws. The shielding of the cable should be
stripped back to permit the seal to form around the indi­vidual leads, rather than around the outside of the
shield. This will prevent any siphoning action that might
occur through the inside of the shield. The electrical
continuity of the shield must be maintained through the
seal via the shield drain wire.

Moisture in the air can be trapped within sections of
conduit and can condense and accumulate at the base
of vertical conduit runs. To eliminate this condition,
explosion-proof drains and breathers should be
installed to automatically bleed off accumulated water.

It is recommended that the detector be oriented with the
conduit opening at the bottom or at either side of the
device. This will reduce the possibility of moisture
entering the junction box through the conduit entry and
also ensure that the

o

i

test lamps are not in a position

that would make the detector overly susceptible to

o

i

Oi

faults. Whenever possible, slope the conduit run down­ward from the detector. Do not use conduit runs that
enter the device from the top. See Figure 10 for identifi­cation of the detector parts of interest when mounting,
and Figure 11 for an example of vertical detector mount­ing.

Detector Mounting and Wiring Procedure

The following procedure should be used for mounting
and wiring the C7052J.

1. Detectors should be located in positions best suited
for covering the area to be protected. Whenever
practical, they should be placed where they will be
easily accessible for cleaning and other periodic
servicing. Particular attention should also be paid
to potential false alarm sources within the cone of
vision of the detector, such as distant arc welding,
rotating fan blades, surface vibration of an IR
source, and movement of people or machines
between the detector and an IR source, all of which
could allow a flickering IR signal to reach the detec­tor. Rain or ice can absorb radiation, which can
reduce the capability of the detector. For outdoor
applications, aim the detector downward to mini­mize the buildup of water or ice on the detector
viewing windows and to prevent the cone of vision
from scanning the horizon. This minimizes
response to distant radiation sources outside the
protected area.

10

Figure 10—Front View of the C7052J Detector

IR SENSOR HOUSING

A1327

*o

TEST LAMP (2)

i

LED (2)

CONDUIT SEAL REQUIRED WITHIN 18 INCHES
OF DETECTOR. DETECTOR MUST BE ORIENTED
WITH CONDUIT ENTRY AT BOTTOM OR SIDE TO
ELIMINATE DRAINAGE INTO JUNCTION BOX.

UV SENSOR HOUSING

oi RING OPENING DOWN

*

o

TEST LAMPS AT TOP OR SIDE

i

LED (2)

o

TEST LAMP

i

NOTE
The wiring procedures in this manual are intended
to ensure proper functioning of the device under
normal conditions. However, because of the many
variations in wiring codes and regulations, total
compliance to these ordinances cannot be guaran­teed. Be certain that all wiring complies with appli­cable regulations that relate to the installation of
electrical equipment in a hazardous area. If in
doubt, consult a qualified electrician before wiring
the system.

2. Remove the junction box cover assembly from the
base by loosening the six screws on the cover (see
Figure 12).

3. Mount the detector junction box base and mounting
bracket assembly on the wall or ceiling. See
Figures 7 and 8 for dimensions of the mounting
bracket. The mounting surface should be free of
excessive heat and vibration.

NOTE
Do not wire the system, or plug in or remove the
sensor modules with power applied.

4. Figure 13 shows the detector terminal block. Letter
designations correspond to connections as indicat­ed below.

A = +24 vdc
B = detector output signal
C = circuit ground
D = Oi control signal

Minimum requirements for wiring the detector are
for the B-lead (signal) to be shielded. It is preferred
that the A-lead, C-lead, and D-lead also be shield­ed to provide maximum immunity to EMI/RFI. The
wiring procedure below is the preferred method of
detector to controller wiring. Refer to Figure 14 for
an example of a typical application showing detec­tor to controller wiring.

a. Connect the B-lead shields to the chassis

(earth) ground connection (terminal 5) of the
controller.

b. Be certain that the shield is NOT connected

to the detector at terminal “C” (circuit ground)
or any other points.

c. Connect the C-leads of the detectors to termi-

nal 2 (circuit ground) of the controller.

d. Connect a non-polarized 0.47 microfarad 250

vdc capacitor from terminal 5 to terminal 2.
This places the earth ground and the circuit
ground at the same ac potential, minimizing
induction of noise into the system through the
detector cable.

5. Check to make sure that all wiring is correct. If con­duit is used, pour the conduit seals and allow them
to dry.

6. If the UV and/or IR sensor modules are already
installed in the detector housing, proceed to step

12. If the sensors are not installed, remove the
applicable sensor housings from the junction box
cover (see Figure 12). If the detectors are
equipped with a cover locking device (see Figure

15), loosen the clamp and disengage the “catch”
from the blind hole. The tool required is a 5/32-inch
hexagonal (Allen) wrench.

7. If the UV sensor module is already installed, proceed
to step 9. If the UV module is not installed, remove
the UV sensor module from its shipping package.

8. Determine the proper orientation for the UV module
by lining up the long index pin on the terminal block
with the hole in the printed circuit board of the mod­ule. See Figure 12. Firmly press the module into
place on the terminal block, taking care not to touch
the glass envelope of the sensor module, since fin­gerprints can absorb UV radiation and reduce the
sensitivity of the sensor.

11 95-8302

PROVIDE ENOUGH CABLE

Figure 11—Vertical Mountign Detector

FOR ADJUSTMENT OF SWIVEL

CONDUIT SEAL

A1478

12

Figure 13—Detectro Terminal Block

Figure 12—C7052J Detector Part Identification

UV TERMINAL BLOCK

INDEX PIN

JUNCTION BOX

JUNCTION BOX COVER

MOUNTING PIN

IR SENSOR MODULE

IR TEST LAMPS (2)

UV SENSOR MODULE

UV TEST LAMP OPENING

O-RING

UV SENSOR HOUSING

UV oi RING

+24 VDC (A)

OUTPUT SIGNAL (B)

O-RING

IR SENSOR HOUSING

IR oi RING

F0946

D0947

CIRCUIT GND (C)

oi SIGNAL (D)

EARTH GND

13 95-8302

HOT

IMPORTANT

If the UV sensor module is supplied with a jumper
plug “J” as shown in Figure 16, remove the jumper
plug from the detector tube module and discard it.
Jumper plug “J” is supplied for installations in
which the tube module is used with other detector
models.

NOTE
The C7052J contains semiconductor devices that
are susceptible to damage by electrostatic dis­charge. An electrostatic charge can build up on
the skin and discharge when an object is touched.
Therefore, use caution when handling the detector,

taking care not to touch the terminals or electronic
components. For more information on proper han­dling, refer to Service Memo form 75-1005 at the
front of this manual.

9. If the IR sensor is already installed, proceed to step

12. If the IR sensor is not installed, remove the IR
module from its shipping package (avoid touching
the IR sensing element at the top of the module).
Two IR sensor designs exist; the DE5500 is electri­cally connected via a wire harness on the junction
box that must be threaded through the sensor mod­ule to a connector at the top of the module (see
Figure 17), the DE3895 plugs directly onto a termi­nal block in the base of the IR housing via connec­tors on the bottom of the IR sensor module (see
Figure 12).

10. If the IR sensors are the DE3895 type that electri­cally connects directly onto the terminal block,
install them by lining up the connection pins using
the index pin to properly orient the module. Press
the sensor firmly into place.

11. If the IR sensor is the DE5500 type that connects
via a wire harness (Figure 17), thread the wire leads
and keyed connector plug through the slotted
opening on the side of the IR module. Plug the IR
module into the two banana plugs inside the junc­tion box cover. If repositioning is necessary to
properly align the

o

i

lamps (as described in the
“NOTE” below), this module can be rotated 180°
and remounted on the banana plugs.

Figure 14—Typical Application Wiring

Figure 15—Cover Locking Assembly (Optional)

NEUTRAL

A0976

24 VDC

+

–

PROCESS
CONTROL

LOAD

LOAD

FAULT

ALARM

0.47µf

1

+

DC INPUT

–

2
3
4

CHASSIS (EARTH) GROUND

5

NC

6

NO

7

COM

8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

FIRE ZONE 1

NC
NO
COM
NC
NO
COM

FIRE ZONE 2

NC
NO
COM
NC

ALARM 1

NO
COM
NC

ALARM 2

NO
COM
NC

FAULT*

NO
COM

THE FAULT RELAY, SHOWN DE-ENERGIZED,

*

IS ENERGIZED UNDER NORMAL OPERATING CONDITIONS.

UP TO EIGHT DETECTORS CAN BE CONNECTED*

R7495

EXTERNAL RESET

CIRCUIT GROUND
CIRCUIT GROUND

31
32
33
34
35

D1

36

D2

37

D3

38

D4

39

D5

40

D6

41

D7

42

D8

43

B1

44

B2

45

B3

46

B4

47

B5

48

B6

49

B7

50

B8

EXTERNAL

RESET SWITCH

A
B
C
D

A
B
C
D

A
B
C
D

C7052J

C7052J

C7052J

BLIND HOLE

CATCH

COVER

LOCKING

ASSEMBLY

A1078

CLAMP

SCREW

STRAP

BARREL

LENS CAP

NOTE

The two

o

i

lamps on the DE5500 IR sensor should
be at the top or side of the detector (when viewed
from the front) and the opening on the

o

i

ring
should be at the bottom. See Figure 10. This will
ensure proper operation of the

o

i

system and also
minimize the accumulation of moisture and con­taminants between the

o

i

ring and the viewing win-

dow. (The

o

i

lamps on the IR sensor are identified

as oblong in shape and clear in color.)

12. Connect the keyed connector plug to the 4-pin con­nector on the DE5500 IR module. Tuck the lead­wires inside the module to prevent binding or wire
damage when installing or removing the sensor
housing.

13. Check the O-rings on both sensor housings to be
sure that they are in good condition and are fitted
properly, then re-install the sensor housings on the
junction box cover. (See the “Maintenance” section
of this manual for information regarding care of O­rings.) The sensor housing with the large viewing
window is for the UV detector and the sensor hous­ing with the small window is for the IR detector.
Hand tighten the sensor housings into the base until
the O-rings are fully seated to maintain the explo­sion-proof and watertight integrity of the housing. If
the unit is equipped with cover locking clamps,
loosen the clamps sufficiently so that the clamp
catches can be seated in the blind holes on the
junction box cover. Fasten the clamps securely
using a 5/32 inch hexagonal (Allen) wrench. (See
Figure 15.)

14. Re-install the junction box cover, making sure that
the center nine-pin connector on the cover is prop­erly aligned with the connector in the junction box.

The six screws must be tight to ensure a metal to
metal fit to maintain explosion-proof and watertight
integrity of the junction box.

15. Inspect and clean (if necessary) the detector view­ing windows and

o

i

rings by following the instruc-

tions in the “Maintenance” section of this manual.

16. The opening of the

o

i

rings should be pointed down
to minimize the accumulation of moisture or con­taminants behind the ring (see Figure 10). Verify
that the

o

i

test lamp is at the top or side of each
sensor. Note that Figure 10 shows the DE5500 IR
module with the test lamps located together on one
side of the edge. The DE3895 IR module has test
lamps located directly opposite one another. In
both cases, ensure that no test lamp is positioned
at the bottom when the detector is installed.

17. If the detector is so equipped, install the air shields
on each sensor housing, then connect the air sup­ply line to the air shields.

NOTE
Be sure that the detector is correctly aimed at the
potential hazard and that no obstructions interfere
with its line of vision. In addition, UV and/or IR
absorbing gases (see Table 2) should not exist
between the detector and the potential hazard.

CONTROLLER INSTALLATION
AND WIRING

The R7495B Controller must be mounted in a non-haz­ardous area. The optional Q4004 Mounting Cage is
designed to hold up to eight modules in a 19 inch
instrument rack. Other mounting cages are available to
accommodate 1, 2, 3, 4 or 6 units. These mounting

14

IR MODULE

Figure 17—IR Module with Four-Wire Connector

Figure 16—Jumper Plug

4–WIRE CONNECTOR PLUG

A1702

JUMPER "J"

A1331

cages can also house voltage converters and other
micro-module equipment that is used in conjunction
with the R7495B Controller as part of the total protection
system. See Figure 18 for illustration and dimensions.

Electrical Connections

All electrical connections are made to the field wiring
connector that is furnished with the controller. Figure 19
shows the terminal configuration for the controller. Power
to the R7495B Controller and C7052J Detectors may be
furnished by external 24 volt batteries, a regulated dc
power supply, or optional Det-Tronics voltage converters.

Terminal 1 — Connect to the positive (+)

side of an external 24 vdc
power source.

Terminal 2 — Connect to the negative (–)

side of the dc power source
(circuit ground). The C termi­nals on the detectors must also
be connected to circuit
ground.

Terminal 3 — Do not use.

Terminal 4 — Do not use.

Terminal 5 — Chassis (earth) ground termi-

nal is connected to the con­troller chassis and should be
connected to the nearest earth
ground connection.

Terminals 6 to 11 — Relay Contacts, Fire Zone 1.

Terminals 12 to 17 — Relay Contacts, Fire Zone 2.

Terminals 18 to 20 — Relay Contacts, Alarm 1.

Terminals 21 to 23 — Relay Contacts, Alarm 2.

Terminals 24 to 26 — Fault relay contacts- the fault

relay is normally energized in
the Normal mode with no sys­tem faults present.

Terminals 31 and 32 — External Reset - a normally

open switch connected
between terminals 31 and 32
(circuit ground) allows the con­troller to be reset from a
remote location.

Terminal 33 — Circuit ground - connect to all

detector wiring shields.

15 95-8302

Figure 18—Q4004 Mounting Cage Dimensions in Inches (MM)

RACK PART NUMBER CONTROLLER
TYPE 005269-XXX POSITIONS FOR: HT: DIM. (A) DIM. (B) DIM. (C) DIM. (D) DIM. (E) WEIGHT

4U –001 8 16 4U 19.00 482.6 18.30 464.8 17.36 440.9 4.00 101.6 6.97 177.1 9.3 4.2

4U –002 6 12 4U 15.06 382.6 14.36 364.7 13.42 340.9 7.6 3.5

4U –003 4 8 4U 11.13 282.6 10.43 264.9 9.49 241.1 5.9 2.7

4U –004 3 6 4U 9.16 232.7 8.46 214.9 7.52 191.0 5.1 2.3

4U –005 2 4 4U 7.19 182.7 6.49 164.9 5.55 141.0 4.2 1.9

4U –006 1 2 4U 5.22 132.6 4.52 114.8 3.58 90.9 3.1 1.4

FIRE GAS INCH MM INCH MM INCH MM INCH MM INCH MM LB KG

(A)

(B)

(C)

1.48 (37.59)

A1475

(D)

ALL CONTROLLER CAGES REQUIRE
A MINIMUM OF 10.12 INCHES (257.1 MM)
DEPTH CLEARANCE

(E)

Terminal 34 — Do not use.

Terminals 35 to 42 — Connect to the D-leads (oi

control signal) of the corre­sponding detectors.

Terminals 43 to 50 — Connect to the B-leads (detec-

tor output) of the correspond­ing detectors.

PROGRAMMING THE CONTROLLER

The R7495B Controller is field programmable in order to
meet the requirements of the individual installation. This
is accomplished by setting rocker switches that are
located on the left side of the controller (see Figure 20)
to either “open” or “closed.” The programming options
are listed below. A more detailed description follows.

1. Number of detectors connected to the controller (up
to eight)

2. Gate Length, Consecutive Gate Selection, and
Count Selection (system sensitivity and time delay).

3. Detector Grouping/Voting Logic

4. Latching/non-latching outputs.

The individual rocker switches are identified by num­bers 1-1, 1-2, 1-3, etc. in this manual. The number pre­ceding the dash indicates the number of the switch
assembly. The number following the dash identifies the
specific rocker on the switch assembly. See Figure 20.

Each rocker switch assembly contains eight separate
rocker switches. The rockers are identified by the num­bers one through eight on one side of the assembly.
The word “open” can be seen on the opposite side.
The switch is open when depressed in the direction of
the word “open” and closed when depressed in the
direction of the numbers.

16

Figure 20—Rocker Switch Setting

Figure 19—Terminal Configuration

J1

1

NOT USED
NOT USED

COMMON

COMMON

COMMON

COMMON

COMMON

COMMON

COMMON

+
–

2
3
4

J2
31

5

EXTERNAL RESET

32

6

CIRCUIT GROUND

33

7

CIRCUIT GROUND

34

8

NOT USED

35

9

D1

36

10

D2

37

11

D3

38

12

D4

39

13

D5

40

14

D6

41

15

D7

42

16

D8

43

17

B1

44

18

B2

45

19

B3

46

20

B4

47

21

B5

48

22

B6

49

23

B7

50

24

B8
25
26

FIRE ZONE 1

FIRE ZONE 2

ALARM 1

ALARM 2

FAULT*

A0972

+24 VDC INPUT

CHASSIS GROUND

NORMALLY CLOSED

NORMALLY OPEN

NORMALLY CLOSED

NORMALLY OPEN

NORMALLY CLOSED

NORMALLY OPEN

NORMALLY CLOSED

NORMALLY OPEN

NORMALLY CLOSED

NORMALLY OPEN

NORMALLY CLOSED

NORMALLY OPEN

NORMALLY CLOSED

NORMALLY OPEN

THE FAULT RELAY, SHOWN DE-ENERGIZED

*

IS NORMALLY ENERGIZED IN THE NORMAL OPERATING MODE
WITH NO FAULTS OCCURING

SWITCH ASSEMBLY 1

DETECTOR SELECTION SWITCH

THIS SWITCH PROGRAMS THE MICROPROCESSOR

SWITCH ASSEMBLY 3

CONSECUTIVE GATE SELECTION

ROCKER 1 – 1 COUNT
ROCKER 2 – 2 COUNTS
ROCKER 3 – 4 COUNTS
ROCKER 4 – 8 COUNTS

ADD VALUE OF CLOSED ROCKERS

2 GATES MINIMUM

COUNT SELECTION

ROCKER 5 – 1 GATE
ROCKER 6 – 2 GATES
ROCKER 7 – 4 GATES
ROCKER 8 – 8 GATES

VALUES OF CLOSED ROCKERS

ARE ADDED – 2 COUNTS MINIMUM

IF GATE IS GREATER THAN OR EQUAL

TO 0.5 SECOND, A MULTIPLICATION FACTOR

ROCKER SWITCH NUMBERS ARE DESIGNATED 1-1, 1-2, 1-3, ETC.
THE NUMBER PRECEDING THE DASH INDICATES THE SWITCH ASSEMBLY.
THE NUMBER FOLLOWING THE DASH INDICATES THE ROCKER NUMBER OF THE SWITCH INDICATED.

DEPRESS ROCKER TOWARD "OPEN" ON SWITCH ASSEMBLY TO SET IN THE OPEN POSITION.
DEPRESS ROCKER TOWARD NUMBER DESIGNATIONS ON SWITCH ASSEMBLY TO SET IN CLOSED POSITION.

A0973

MUST BE USED.

NOTE 1:

NOTE 2:

FOR EACH DETECTOR CONNECTED

PLACE ROCKER IN OPEN POSITION

FOR EACH CHANNEL WITH A DETECTOR CONNECTED

SWITCH ASSEMBLY 2

GATE LENGTH

CLOSE ROCKERS TO ACTIVATE

ROCKER 1 – 31.25 MILLISECONDS

ROCKER 2 – 62.5 MILLISECONDS

ROCKER 3 – 0.125 SECOND

ROCKER 4 – 0.25 SECOND

ROCKER 5 – 0.5 SECOND

ROCKER 6 – 1 SECOND
ROCKER 7 – 2 SECONDS
ROCKER 8 – 4 SECONDS

VALUES OF ROCKERS CLOSED

ARE ADDED TOGETHER

SWITCH ASSEMBLY 4

DETECTOR GROUPING/VOTING LOGIC

ROCKER POSITION

4-1
CL
CL
CL
CL
OP
OP
OP
OP

ROCKER 5 – LATCHING OUTPUTS WHEN ROCKER IS OPEN

4-3

4-2

DC

DC

DC

DC

OP

DC

CL

DC

ALL OPEN
1 CLOSED
2 CLOSED
3 CLOSED

OP = OPEN, CL = CLOSED, DC = DON'T CARE

FIRE

DETECTOR RESPONSE

ZONE

4-4

OUTPUTS

OP

1

CL

1

DC

2

DC

2

1 OF 8 DETECTORS

1•2

2 OF 8 DETECTORS

1•2

3 OF 8 DETECTORS

1•2

4 OF 8 DETECTORS

1•2

1•2 = 1 AND 2

ROCKERS 6, 7, 8 NOT USED

1 DETECTOR

2 DETECTORS

1 DETECTOR

2 DETECTORS

The rocker switches must be set before power is
applied to the system. Do not plug the controller in or
remove it from the mounting rack while power is turned
on.

CAUTION

Use care when setting the rocker switches on the
controller. An incorrectly set rocker switch can
result in an obvious controller malfunction, or the
controller could appear to be functioning normally,
but not produce the desired output in response to
the input conditions. (Some of the rocker switches
on the R7495B are not used. These rockers
should be left open.)

Detector Selection - Rocker Switches 1-1 to 1-8

The number after the dash corresponds to the number
of each zone. Open the rocker for each zone that has a
detector connected to it. Care must be taken when set­ting these rockers. If a rocker is set open, but no detec­tor is connected in that location, the controller will indi­cate a fault. If a rocker is set closed when a detector is
connected, the controller will appear to be operating
correctly and will produce an alarm condition if the cor­responding detectors sense a fire. However, that
detector will be eliminated from the Automatic

o

i

test
sequence, and any faults occurring in its circuitry or
wiring will not be indicated.

STAR Logic Programming (System Sensitivity and
Time Delay) - Rocker Switches 2-1 to 2-8 (Gate
Length), Rocker Switches 3-1 to 3-4 (Count
Selection Per Gate), and Rocker Switches 3-5 to 3­8 (Consecutive Gates Selection).

The STAR Logic switch settings determine system sen­sitivity and time delay. The most important factor in
determining the appropriate sensitivity setting for a par­ticular application is the intensity of radiation expected
to reach the detector in the event of a fire. This
depends on several factors, including the distance of
the detector from the potential fire, the fuel type, the
flame size, and whether any radiation absorbing vapors
are present (these are listed in Table 2).

The most effective way to set system sensitivity is to
install the system, program the STAR Logic according
to the typical settings shown in Figure 21, program all
other aspects of controller operation according to this
section (“Programming the Controller”), then perform
the “Initial and Periodic Checkout Procedure” using a
UV/IR test lamp and the “STAR Programming Checkout
Procedure.”. If the system fails to respond appropriate­ly during these tests and all system wiring is correct,
then system sensitivity (gate length, counts per gate,
and consecutive gates) needs to be adjusted. It is
important that all wiring and programmed settings be
checked to ensure that they are correct before adjusting
these settings.

17 95-8302

Figure 21—Graphic Representation of STAR Logic (Typical Setting Shown)

R7495 STAR Logic Program

4 Counts per Gate

0.25 Second Gate Length

4 Consecutive Gates

R7495 Switch Settings

Rockers Closed Rockers Open

3-3 3-1, 3-2, 3-4

2-4 2-1, 2-2, 2-3, 2-5, 2-6, 2-7, 2-8

3-7 3-5, 3-6, 3-8

A1584

FLAME

C7052

4 COUNTS PER GATE

UV SIGNAL

IR SIGNAL

4 CONSECUTIVE GATES

0.25 SECOND GATE LENGTH

COUNT (SIGNAL)

UV

AND

IR

UV/IR

FIRE

ALARM

CONDITION

Rocker switch assemblies 2 and 3 control three vari­ables; gate length, counts per gate and consecutive
gates required for a fire output. Refer to Figure 21 for a
visual representation of how these variables function
together with typical controller settings. Keep in mind
that when the UV and IR sensors of the detector
respond to a fire, the IR sensor activates the circuitry in
the UV/IR detector junction box. This allows the electri­cal pulses (signal) from the UV sensor to be sent to the
controller. The frequency of this signal is proportional to
the intensity of the fire. The controller looks at this sig­nal in comparison to the sensitivity settings in order to
determine whether a fire exists. A brief description of
each variable follows:

1. Gate Length is adjustable from 31.25 milliseconds
to 8 seconds. The gate length is the increment of
time that the controller looks at the detector signal
to determine if the “Counts per Gate” requirement is
fulfilled. In Figure 21, the gate length is 0.25 sec­onds (Rocker Switch 2-4 closed, Rocker Switches
2-1, 2-2, 2-3, 2-5, 2-6, 2-7, and 2-8 open).

2. Counts per Gate is adjustable from 2 to 15 counts.
These counts make up the signal from the detector
and are a direct response to a flame or other UV/IR
source. In Figure 21, the counts per gate setting is
4 counts (Rocker Switch 3-3 closed, Rocker
Switches 3-1, 3-2, and 3-4 open).

3. Consecutive Gates required for a fire output are
adjustable from 2 to 15 gates. This is the number of
consecutive gates in which the “Counts per Gate”
requirement is fulfilled that the controller must see
before going into a fire alarm condition. In Figure
21, the consecutive gates setting is 4 gates (Rocker
Switch 3-7 closed, Rocker Switches 3-5, 3-6, and 3­8 open).

If changes in the sensitivity and/or time delay settings
are required, read the detailed discussions of each of
the three STAR Logic variables that follows before mak­ing changes. When changing the settings, keep in
mind the following guidelines:

1. Increasing Gate Length while the other variables
remain unchanged results in higher sensitivity and a
longer time delay.

2. Increasing Consecutive Gates while the other vari­ables remain unchanged results in a longer time
delay and greater noise immunity.

3. Increasing Counts per Gate while the other vari­ables remain unchanged results in lower sensitivity
and greater false alarm rejection.

Gate Length - Rocker Switches 2-1 to 2-8

The gate length can be adjusted in 31.25 millisecond
increments from 31.25 milliseconds to 8 seconds. Each
rocker selects a particular time value. The gate length
is the value of all rockers closed, added together. If no
rocker is closed, the controller will select the minimum
length (31.25 milliseconds). The typical gate length set­tings used in most applications are between 0.125 and

0.5 second.

Rocker 2-1 - 31.25 milliseconds
Rocker 2-2 - 62.5 milliseconds
Rocker 2-3 - 0.125 second
Rocker 2-4 - 0.25 second
Rocker 2-5 - 0.5 seconds
Rocker 2-6 - 1 seconds
Rocker 2-7 - 2 seconds
Rocker 2-8 - 4 seconds

The value of the closed switches are added together to
obtain the total time delay.

Count Selection - Rocker Switches 3-1 to 3-4

When a gate length of less than 0.5 second, the rockers
select counts needed per gate for a fire signal. The val­ues of all rockers closed are added together. If no
counts or less than 2 counts are selected (only rocker 1
closed), the microprocessor will select 2. Counts per
gate are selectable in 1 count increments from 2 to 15
counts. The typical counts per gate setting used in
most applications are between 2 and 8 counts.

Rocker 3-1 - 1 count
Rocker 3-2 - 2 counts
Rocker 3-3 - 4 counts
Rocker 3-4 - 8 counts

When a gate length of 0.5 second or greater is used, the
programmed counts per gate value is multiplied by a fac­tor that is determined by the gate length that has been
programmed using rocker switches 2-5 to 2-8. Refer to
Figure 22 to determine the proper multiplication factor.
Note that the multiplication factor is determined by the
highest numbered rocker switch in the closed position.

The STAR logic program uses this multiplication tech­nique to prevent accidental programming of a very low
count value combined with a long gate length, since this
combination would result in an extremely high sensitivity
level that would increase susceptibility to false alarms.

For example, suppose that a gate length of 1.5 seconds
and a sensitivity of 4 counts per gate is selected. Since
the gate length exceeds 0.5 second, the counts per
gate value must be multiplied by the factor determined

18

from Figure 22. In this case, 4 counts per gate is multi­plied by a factor of 4, to obtain a total programmed
value of 16 counts per gate. Without this feature, it
would be possible to program the system to interpret 4
counts in 1.5 seconds as a fire signal, which would
make the system susceptible to frequent false alarms.

Consecutive Gate Selection - Rocker Switches 3-5
to 3-8

These rockers select the number of consecutive gates
required for a fire signal. Consecutive gates are
selectable in 1-gate increments from 2 to 15 gates. If
fewer than 2 gates are selected (only rocker 5 closed),
the microprocessor will select 2. The values of the rock­ers closed are added together. The typical consecutive
gate settings used in most applications are between 3
and 8 gates.

Rocker 3-5 - 1 Gate
Rocker 3-6 - 2 Gates
Rocker 3-7 - 4 Gates
Rocker 3-8 - 8 Gates

Detector Grouping/Voting Logic Selection 4-1 to 4-4

Rocker switches 4-1 to 4-4 are used to program the
controller for the particular voting arrangement to be
used. (Refer to the “System Description” section of this
manual for a description of the options available with the
Detector Grouping/Voting Logic feature.) Refer to
Figure 20 (Switch Assembly 4) to determine the correct
positions for rocker switches 4-1 to 4-4.

NOTE
When in the Normal mode and the outputs are set
for non-latching operation, the voting process will
actuate the Fire Logic output(s) only if the pre­selected number of detectors “see” fire at the same
time. When the outputs are set for latching opera­tion, the voting process will actuate the Fire Logic
output(s) when voting criteria have been met, even
if a fire is not being seen by each detector at the
same time.

Detector Grouping - Rocker 4-1

Separate - closed
Combined - open

When rocker switch 4-1 is closed, detectors 1 to 4 acti­vate the Alarm 1 and Fire Zone 1 outputs, and detectors
5 to 8 activate the Alarm 2 and Fire Zone 2 outputs.

When rocker switch 4-1 is open, a fire at any of eight
detectors causes actuation of both Alarm outputs.
Fulfillment of the programmed voting requirements
results in actuation of both Fire Zone outputs.

Voting Selection - Rockers 4-2 to 4-4

Rocker switches 4-2 to 4-4 are used to program the
controller for the particular voting logic arrangement to
be used. Refer to the “Description” section of this man­ual for a description of the options available with the vot­ing logic feature. Then refer to the Voting Selection
Table (Table 3) to determine the correct switch posi­tions.

Separate — For two separate voting groups:
4-1 is closed
4-2 is not used in this voting arrangement
4-3 programs Fire Zone output 2 (channels 5, 6, 7, 8)

- open, any one detector

- closed, any two detectors

4-4 programs Fire Zone output 1 (channels 1, 2, 3, 4)

- open, any one detector

- closed, any two detectors

19 95-8302

START

Figure 22—Multiplication Factors

Table 3—Voting Selection Table

ROCKER 2–8

CLOSED?

NO

ROCKER 2–7

CLOSED?

YES

YES

MULTIPLY BY 16

MULTIPLY BY 8

NO

NO

YES

YES

MULTIPLY BY 4

MULTIPLY BY 2

A974

ROCKER 2–6

CLOSED?

ROCKER 2–5

CLOSED?

SWITCH ASSEMBLY 4

VOTING LOGIC

ROCKER POSITION

4-1
CL
CL
CL
CL
OP
OP
OP
OP

4-3

4-2

DC

DC

DC

DC

OP

DC

CL

DC

ALL OPEN
1 CLOSED
2 CLOSED
3 CLOSED

OP = OPEN, CL = CLOSED, DC = DON'T CARE

4-4
OP

CL
DC
DC

FIRE

ZONE

OUTPUTS

1
1
2

2
1•2
1•2
1•2
1•2

1•2 = 1 AND 2

DETECTOR RESPONSE

1 DETECTOR

2 DETECTORS

1 DETECTOR

2 DETECTORS
1 OF 8 DETECTORS
2 OF 8 DETECTORS
3 OF 8 DETECTORS
4 OF 8 DETECTORS

Common— For up to eight channels voting, and Fire
Zone outputs 1 and 2 energized simultaneously:
4-1 is open
4-2, 4-3, 4-4 - All open = any one detector

Any one closed = any two detectors
Any two closed = any three detectors
All three closed = any four detectors

Outputs Latching/Non-latching - Rocker Switch 4-5

Once energized, an output will remain on (latching) until
the controller is reset if rocker 4-5 is set open.

Rockers 4-6, 4-7 and 4-8 are not used.

When the proper position for each of the rocker switch­es has been determined, record this information careful­ly on the system layout chart in Figure 23. This provides
a means of double checking switch positions before
power is applied to the controller, and to provide a
record of switch positions for future reference.

TYPICAL SYSTEM APPLICATION

The following application is an example only. For assis­tance in adapting a system to your individual require­ments, contact the Field Support Group at Detector
Electronics.

Power is supplied to the system by a 24 volt dc power
supply. A four conductor shielded cable is used to con­nect the detectors to the controller as shown in Figure

14. Terminals A and C (power connections) are com­mon to all the detectors in the system. The B- and D­leads of each detector are connected to their corre­sponding “B” and “D” terminals on the controller. The
shields are tied together and grounded at terminal 33.
A 0.47 microfarad, 250 volt capacitor is placed between
terminal 5 and terminal 2. A remote reset switch is pro­vided for resetting the controller or inhibiting the outputs
from a remote location. The connections are made to
terminals 31 and 32.

Figure 23—System Layout Chart

20

SWITCH 1

DETECTOR SELECT

ROCKER OPEN CLOSED

1

2

3

4

5

6

7

8

OPEN SWITCH FOR EACH

DETECTOR CONNECTED

SWITCH 3

CONSECUTIVE GATE

SELECTION

ROCKER OPEN CLOSED

1

2

3

4

5 – 1 GATE

6 – 2 GATES

7 – 4 GATES

8 – 8 GATES

ADD VALUE OF CLOSED

ROCKERS – 2 GATES MINIMUM

SWITCH 3

COUNT SELECTION

ROCKER OPEN CLOSED

1 (1 COUNT)

2 (2 COUNTS)

3 (4 COUNTS)

4 (8 COUNTS)

ROCKERS – 2 COUNTS MINIMUM
– USE MULTIPLICATION FACTOR

IF GATE IS 0.5 SECOND OR GREATER

A0975

5

6

7

8

ADD VALUE OF CLOSED

OPEN

OPEN

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

SWITCH 2

GATE LENGTH (SECONDS)

ROCKER OPEN CLOSED

8 – 4.0

7 – 2.0

6 – 1.0

5 – 0.5

4 – 0.25

3 – 0.125

2 – 0.062

1 – 0.031

ADD VALUE OF

CLOSED ROCKERS

SWITCH 4

OUTPUTS LATCHING

ROCKER OPEN CLOSED

1

2

3

4

5

6

7

8

OPEN = LATCHING

VOTING LOGIC

ROCKER OPEN CLOSED

1

2

3

4

5

6

7

8

SEE VOTING TABLE IN FIGURE 20

OPEN

SWITCH 4

OPEN

A0975

OPEN

OPEN

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

Power is connected to a load circuit through the normal­ly closed contacts of the Alarm relay. Detection of a fire
causes the contacts to open and remove power from the
load. If the pre-programmed voting requirements are
met, power is applied to an extinguishing load through
the Fire Zone relay. Power is connected to a process
control circuit through the normally energized Fault relay.
In the event of a system fault or when the controller is in
the Test mode, the contacts open and remove power
from the process. An annunciation device is connected
to the power source through the Fault relay to provide a
visual or audible warning of a system failure.

STARTUP PROCEDURE

The startup procedure should be performed after instal­lation of the equipment is complete.

1. After making the electrical connections and setting
the switches, plug the controller into the wiring con­nector.

2. Disable any extinguishing system connected to the
system.

3. Turn on the input power to the system and perform
the “Initial and Periodic Checkout Procedure.”

4. If the controller is operating normally and is pro­grammed correctly, remove any mechanical block­ing devices and restore power to the extinguishing
loads.

INITIAL AND PERIODIC CHECKOUT
PROCEDURE

The entire system should be periodically checked with a
UV/IR test lamp to be sure that the detectors are not
obstructed, that the area “seen” by the detector has not
changed, and that there is no fault in the oi circuit.

1. Place the Mode switch in the TEST position. The
FAULT LED will be illuminated.

CAUTION

Placing the controller in the Test mode inhibits the
outputs, rendering the system incapable of actuating
any extinguishing or alarm circuits that are connect­ed to it. However, for maximum safety, secure the
output loads that would normally be actuated by the
system before performing the checkout procedure.

2. Shine the UV/IR test lamp into the viewing window
of the detector under test. The ALARM LED is illu­minated and the corresponding DETECTOR LED
blinks.

3. If the voting requirements are met, the appropriate
FIRE ZONE LED(s) is also illuminated.

4. Turn off the UV/IR source. The FIRE ZONE LED
remains on if it was previously illuminated. The
DETECTOR LED remains on, but stops blinking.

5. Repeat steps 2 through 4 for each detector in the
system.

6. After all detectors have been checked, reset the
system by placing the Mode switch in the NORMAL
position. All LEDs except the POWER LED are off.

7. Restore power to the output loads and remove any
mechanical blocking devices.

Star Programming Checkout Procedure

1. Secure output loads (remove power from valves,
relays or other devices that might otherwise be
actuated by the UV/IR system) before testing.

2. Apply power to the UV/IR detection system.

3. Ensure that the area being monitored is operating
under normal conditions (equipment that would nor­mally be on is on).

4. Place the UV/IR controller toggle switch in the NOR­MAL position and monitor for one hour.

— If the rockers have been set correctly, transient

radiation in the area should not activate the system.
The upper and lower LED displays should remain
dark. If this is the case, lower (more sensitive) set­tings can be attempted.

— If the system sensitivity is set too high, one of the

eight DETECTOR LEDs will turn on and the appro­priate FIRE ZONE LEDs will turn on if voting require­ments are met. If this happens, set the rocker
switches for more counts per gate, for more con­secutive gates required for actuation, or for a short­er gate length and repeat the test. Altering detector
placement may also decrease the susceptibility of
the system to transient radiation.

For further assistance, contact the Field Support Group
at Detector Electronics.

MAINTENANCE

The C7052J Detector requires no periodic calibration.
However, to maintain maximum sensitivity, the detector
viewing windows must be kept clean at all times. Even
a small amount of certain UV or IR absorbing materials

21 95-8302

(sometimes barely detectable to the human eye) can
significantly reduce the sensitivity of the detector. The
windows and

o

i

rings should be thoroughly cleaned on
a regular basis. The length of time between periodic
cleanings will be determined by the nature and amount
of contaminants present in the environment.

Remove the

o

i

rings by squeezing the tabs together
and pulling away from the detector. Clean the viewing
windows thoroughly, all the way to the edge. Also clean
the reflective surface of the

o

i

rings (the surface of the
ring that faces the detector viewing window). When re­installing an

o

i

ring, hold it by its tabs to avoid leaving
fingerprints on the reflective surface. Re-install the ring
so that the opening is pointed down to prevent a
buildup of contaminants. If corrosive contaminants in
the atmosphere cause the reflective rings to deteriorate
to the extent that it is no longer possible to restore them
to their original condition, they must be replaced.

Det-Tronics window cleaning solution (part number
001680-001) is designed specifically for cleaning the
optical surfaces of the detector. DO NOT use commer­cial cleaners. These products can leave a residue on
the surface that is intended to give it a “sparkling” look,
however, this residue can substantially attenuate the
radiation reaching the sensor.

Use a clean cloth or tissue to clean the window. DO
NOT use commercial glass cleaning tissues, since
many of these contain a silicone substance that remains
on the window after cleaning. Silicone readily absorbs
radiation and can effectively “blind” the detector, even
though the window appears to be clean.

NOTE
When cleaning the detector windows, remove input
power or place the system in the “Bypass” or
“Reset/Inhibit” mode. Rubbing motion on the sur­face of the windows during cleaning can create an
unwanted output activation.

Viton O-rings on each of the detector housings are used
to ensure the watertight integrity of the detector.
Periodically, the housing should be opened and the O­rings inspected for breaks, cracks, and dryness. To test
them, remove the rings from the detector housing and
stretch them slightly. If cracks are visible, the ring should
be replaced. If they feel dry to the touch, a thin coating of
lubricant should be applied. When re-installing the rings,
be sure that they are properly seated in the groove on the
housing. It is imperative that these O-rings be properly
installed and in good condition. Failure to maintain these
rings can allow water to enter the detector and cause
premature failure. The life expectancy of Viton O-rings
can vary considerably, depending on the amount and

nature of contaminants that are present in the environ­ment. The individual responsible for maintenance of the
system must rely on experience and common sense to
determine how frequently the rings should be inspected.

The recommended material for lubricating the O-rings is
a silicone free polyalphaolefin grease, part number
005003-001, available from Detector Electronics. A
coating of lubricant should also be applied to the
threads on the sensor housings before reassembling the
detector. This will both lubricate the threads and help to
prevent moisture from entering the detector housing.

Refer to “Recommended Spare Parts” in the “Ordering
Information” section of this manual for a list of products
available from Detector Electronics for maintenance of
the detector.

Sensor Module Replacement Procedure

To replace a defective module:

CAUTION

Do not open the detector housing in a hazardous
location without first removing power.

a. Remove power from the detector.

b. Remove the sensor housing (see Figure 12).

c. Remove the sensor module.

d. Determine the proper orientation for the new

sensor module (with the o

i

test lamps posi­tioned at the top or side of the detector), then
install the module. Attach the connector plug
(DE5500 models of the IR sensor only).

e. Ensure that the O-rings at the base of the sen-

sor housing are positioned correctly and in
good condition. (Refer to the “Maintenance”
section of this manual for complete informa­tion regarding care of O-rings.)

f. Re-install the sensor housing. Hand tighten

the sensor housing into the base until the O­ring is fully seated to ensure explosion-proof
and watertight integrity of the housing.

g. Inspect the viewing windows and o

i

rings and

clean if necessary. Also check the position of

the o

i

rings.

h. Perform the “Startup Procedure” before return-

ing the system to normal operation.

22

TROUBLESHOOTING

Table 4 is intended to serve as an aid in locating the
source of a system malfunction. The R7495B Controller is
not designed to be repaired by the customer in the field,
but should be returned to the factory in the event of a mal­function. Refer to the “Maintenance” section of this man­ual for information regarding servicing of the detector.

DEVICE REPAIR AND RETURN

Prior to returning devices or components, contact the
nearest local Detector Electronics office so that an RMI
(Return Material Identification) number can be
assigned. A written statement describing the malfunc­tion must accompany the returned device or component
to expedite finding the cause of the failure, thereby
reducing the time and cost of the repair to the customer.
Return all equipment transportation prepaid to the facto­ry in Minneapolis.

Detector Electronics Corporation
6901 West 110th Street
Minneapolis, Minnesota 55438 USA
Operator: [phone] or (800) 765-FIRE
Customer Service: [phone]
Fax: [phone]
Web site: www.detronics.com
E-mail: [e-mail]

ENGINEERING SPECIFICATIONS

The UV/IR flame detection system shall have a micro­processor-based controller that can operate up to 8
detectors and provide relay outputs through the use of a
relay output module. The controller shall be field pro­grammable for selecting time delay length, sensitivity,
voting output configuration, and latching or non-latching
operation. The system shall operate on 24 vdc. The
UV/IR flame detection system shall be capable of
responding to a 1 foot by 1 foot gasoline fire at a dis­tance of 50 feet. The detector shall be capable of 1.0
second response time to an intense fire signal. It shall
not respond to radiation generated by arc welding, x
rays, or hot surfaces, but shall be capable of respond­ing to a fire in their presence. The UV/IR flame detector
shall be in a red, copper-free aluminum enclosure1.
The detector shall be the Det-Tronics model C7052J, no
equal. The controller shall be the Det-Tronics model
R7495B Controller and the that fits in the Det-Tronics
model Q4004 Mounting Rack which is designed to fit
standard 19” racks, no equal.

The UV/IR flame detector shall have one 3/4” NPT2 entry
for field wiring.

The controller shall have visual annunciation of fire and
fault conditions. The controller shall have eight red
LEDs for individual detector alarm indications, one
green LED for power indication, one yellow LED for fault
indication, one red LED to indicate an alarm, and two
red LEDs for fire zone (voting) output indication.

The signal processing shall require the UV radiation and
the flickering IR radiation to exceed field adjust thresh­old levels and time delay before signalling an alarm
condition. The detector shall have a 80 degree cone of
vision and be of a modular plug-in design that allows
the UV and IR sensor modules to be easily field
replaced without the use of special tools. All optical
surfaces shall be easy to access for cleaning. No metal
rods shall be allowed in front of the sensor windows.

The UV/IR flame detector shall have optical testing
capabilities on both the UV and IR sensor. Films that
blind the UV sensor or the IR sensor shall cause a fail­ure of the optical test.

The UV/IR flame detector shall be rated for an operating
temperature range of -40°F to +167°F (–40°C to +75°C)
and a storage temperature of -40°F to +185°F (–40°C to
+85°C). The detector shall operate over a humidity
range of 0 to 95% RH and be able to withstand 100%
condensing humidity for short periods of time. All print­ed circuit boards shall be coated to provide protection
from the environmental conditions. The UV/IR flame
detector shall meet MIL-STD 810C for vibration and

23 95-8302

Table 4—Troubleshooting Guide

Problem Possible Cause

No POWER LED 1. Input power failure.

2. Wiring to external power source

3. Controller power supply failure.

FAULT LED on 1. Mode switch in TEST position.

2. Low input voltage.

FAULT LED and a 1. o

i

fault - dirty window and/or the

DETECTOR LED on o

i

ring

2. Detector module has lost sensitivity

3. Detector wiring problem

FAULT LED off, 1. Detector responding to UV/IR
DETECTOR LED source not large enough to exceed
blinking slowly the fire threshold programmed into

the controller

ALARM LED on, no 1. Mode switch in TEST position.
actuation of outputs 2. Output circuit failure.

have a swivel mounting bracket to provide a means to
easily mount and aim the detector.

The UV/IR flame detector shall be explosion-proof for
Class I, Division 1, Groups B, C and D; Class II, Division
1, Groups E, F and G. The device shall be rated NEMA
4 (dust-tight, watertight). The detector shall be FM
approved3.

An explosion-proof UV/IR test lamp shall be provided to
allow field testing of the UV/IR flame detection system.
The test lamp shall be FM approved for use in Class I,
Division 1, Groups C and D hazardous areas. The
explosion-proof UV/IR test lamp shall be the Det-Tronics
model W867, no equal.

The following options can be substituted for the item in
bold:

1

or: “in a 316 stainless steel enclosure.”

2

or “25 mm”

3

or: “flame-proof for EEx d IIB. The device shall

be rated IP66 (dust-tight/water-tight). The
detector shall be BASEEFA/CENELEC certi­fied.”

or: “explosion-proof for Class I, Division 1,

Groups C and D; Class II, Division 1, Groups
E, F and G. The device shall be rated NEMA
4 (dust-tight, watertight). The detector shall
be CSA certified.

ORDERING INFORMATION

When ordering, specify:
— R7495B Controller
— C7052J Detector
— Number detectors needed
— Detector housing materials

— Anodized copper-free aluminum
— 316 stainless steel

— Approvals required

—FM
— CSA
— BASEEFA/CENELEC

ACCESSORIES

— Q4004 Mounting Cage accommodates eight mod-

ules (Controllers) and fits standard 19-inch instru­ment rack. Smaller sizes are available.

— Filler panels for empty spaces in the Q4004

Mounting Cage
— 000507-XXX power supplies
— Cover locking assembly
— Q1113 Air Shields
— W867 UV/IR Test Lamp
— Q9001G Swivel Assembly

RECOMMENDED SPARE PARTS

Description Part Number Quantity
UV

o

i

rings 002519-001 2 per 10 detectors

IR

o

i

rings 003525-001 2 per 10 detectors
UV Sensor Module DE1888 1 per 10 detectors
IR Sensor Module 003895-001 1 per 10 detectors

(plug-in type)

003895-002 1 per 10 detectors
IR Sensor Module 005500-001 1 per 10 detectors
(wire harness type)

Junction box circuit board004432-001 1 per 10 detec­tors
O-rings 107427-004 4 per 10 detectors
Grease 005003-001 1 per 10 detectors

(silicone-free)

Window Cleaner Kit 001680-001

(six bottles)

APPLICATION ASSISTANCE

For assistance in ordering a system to fit your applica­tion, please contact:

Detector Electronics Corporation
6901 West 110th Street
Minneapolis, Minnesota 55438 USA
Operator: [phone] or (800) 765-FIRE
Customer Service: [phone]
Fax: [phone]
Web site: www.detronics.com
E-mail: [e-mail]

24