Det-Tronics R7495D User Manual

Instructions 95-8331-02

UVIR Flame Detection System
R7495 Dual Channel Controller
C7052J Detector

Detector Electronics Corporation
6901 West 110th Street •Minneapolis, Minnesota 55438 USA
Tel: [phone] or 800.765.3473 •Fax: [phone]

4/03 95-8331-02

APPLICATION ................................................................1

FEATURES .....................................................................2

SYSTEM DESCRIPTION................................................2

Detector....................................................................2

Controller..................................................................3

SPECIFICATIONS ..........................................................5

OPTIONS ........................................................................6

RESPONSE CHARACTERISTICS .................................6

APPLICATION GUIDELINES..........................................7

INSTALLATION...............................................................9

Detector Positioning .................................................9

Wiring Requirements..............................................10

Detector Mounting and Wiring Procedure ..............10

CONTROLLER INSTALLATION AND WIRING ............15

Electrical Connections............................................15

PROGRAMMING THE CONTROLLER ........................16

TYPICAL SYSTEM APPLICATION...............................19

STARTUP PROCEDURE .............................................20

INITIAL AND PERIODIC CHECKOUT PROCEDURE..21

STAR Programming Checkout Procedure .............21

MAINTENANCE ............................................................21

Sensor Module Replacement Procedure ...............22

TROUBLESHOOTING ..................................................22

DEVICE REPAIR AND RETURN..................................23

ENGINEERING SPECIFICATIONS ..............................23

ORDERING INFORMATION.........................................24

Accessories ............................................................24

Recommended Spare Parts ...................................24

APPLICATION ASSISTANCE.......................................24

List of Illustrations

Figure 1 Detector Sensitivity Range .........................2

Figure 2 o

i

Function within the Detector ..................3

Figure 3 Controller Front Panel ................................3

Figure 4 Cone of Vision ............................................5

Figure 5 Detector Dimensions in Inches

(Millimeters) ................................................6

Figure 6 Controller Dimensions in Inches

(Millimeters) ................................................7

Figure 7 Q9001G Swivel Mounting Bracket

Dimensions.................................................7

Figure 8 Mounting Base Dimensions........................7

Figure 9 Blackbody Spectral Emittance....................8

Figure 10 Front View of the C7052 Detector ............11

Figure 11 Vertical Detector Mounting .......................11

Figure 12 C7052J Detector Part Identification..........12

Figure 13 Detector Terminal Block ...........................12

Figure 14 Detector Connection.................................13

Figure 15 Cover Locking Assembly ..........................13

Figure 16 Jumper Plug .............................................14

Figure 17 IR Module with Four-Wire Connector .......14

Figure 18 Q4004 Mounting Cage Dimensions

in Inches (Millimeters)...............................15

Figure 19 Controller Terminal Configuration.............16

Figure 20 Rocker Switch Setting ..............................17

Figure 21 Graphic Representation of STAR Logic

(Typical Settings Shown)..........................18

Figure 22 Multiplication Factors................................19

Figure 23 System Layout Chart ................................20

Figure 24 Normally Energized Load Circuit

Connected to Alarm Relay........................21

Figure 25 Normally Unenergized Load Circuit

Connected to Fire Relay...........................21

List of Tables

Table 1 C7052J Typical Response Distances.........8

Table 2 Radiation Absorbing Gases and Vapors ....9

Table 3 Troubleshooting Guide .............................23

Table of Contents

2

NOTE

Not compliant to FM 3260 (2000).

APPLICATION

The R7495D/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 R7495D/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
R7495D/C7052J UV/IR system provides reliable flame
detection while being virtually immune to false alarms.

The 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 contin­uously monitors up to two UV/IR detectors and ener­gizes the appropriate output relays in response to a fire

signal from the detectors. Five 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

INSTRUCTIONS

UV/IR Flame Detection System

R7495D Dual Channel Controller

C7052J Detector

©Detector Electronics Corporation 2003 4/03 95-8331-02

®

*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.

DET-TRONICS

FEATURES

• Controller continuously monitors up to two UV/IR
detectors.

• 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.

• Each detector can independently register an alarm.

• Front panel LEDs indicate fire response and system
fault conditions.

• Microprocessor control.

• All automatic test functions performed with the system
on line.

• Automatic Optical Integrity (oi) for both UV and IR
sensors.

• Field adjustable sensitivity and time delay.

• Explosion-proof (flame-proof) detector housing.

• FM approved, CSA and BASEEFA/CENELEC certified.

• Relay outputs can be set for latching or non-latching
response.

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 an 80 degree cone of vision.
Either one or two C7052J Detectors can be connected
to one R7495D Controller.

The UV sensor responds to high energy radiation with
wavelengths from 0.185 to 0.245 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 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.

oi Feature

Both sensors are equipped with the automatic Optical
Integrity (oi) 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 oi 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 oi test three consecu­tive times for an oi fault signal to be generated.

The oi test is initiated by a signal from the controller,
which causes actuation of the oi test lamps. A calibrat­ed low level test beam is generated by the oi test
lamps, as shown in Figure 2. Although the test lamps
are mounted in the same enclosure with the sensor, an

4

Figure 1—Detector Sensitivity Range

5.04.03.02.01.51.00.90.80.70.60.50.40.30.20.1

ATMOSPHERIC

TRANSMISSION

WAVELENGTH (MICRONS)

SOLAR
RADIATION
REACHING
THE EARTH

INFRARED

SENSOR

RESPONSE

VISIBLE INFRARED

ULTRAVIOLET

SENSOR

RESPONSE

ULTRAVIOLET

100

75
50

25

0

A1070

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.

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 R7495D 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 R7495D Controller, it is indicated by a
continuously energized green LED. All other lights and
displays on the R7495D 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.

With power applied and the TEST/NORM toggle switch
in the normal mode, the R7495D Controller continuously
cycles through the Automatic Optical Integrity test (see
the “oi Feature” section), checking each detector and
its wiring. At the same time, it monitors the system for
any status changes, such as a fault or a “fire” signal
from one of the detectors, 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 and generating the
appropriate output.

Front Panel

The front panel of the R7495D provides a switch for
selecting mode of operation and initiating test functions.
It also provides LEDs for indicating system status.
Figure 3 illustrates the front panel of the controller.

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).

UV DETECTOR

IR DETECTOR

UV TEST LAMP

OPTICAL SHIELD

VIEWING WINDOW

SNAP-IN

o

i

RING

IR TEST LAMP (2)

IR SENSING ELEMENT

SNAP-IN

o

i

RING

OPTICAL FILTER

VIEWING WINDOW

UV SENSOR

B1048

5 95-8331

Figure 2—oiFunction within the Detector

Figure 3—Controller Front Panel

A1700

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 when in the the Normal mode, or that
the controller is in the Reset or Test mode.

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

6. Pressing the RESET/LAMP TEST button illuminates
all LEDs for testing and 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).

7. The TEST/NORM toggle switch selects Test or
Normal mode.

Normal Mode

Under normal operating conditions, the POWER LED is on
and all others are off. The alarm and fire relays are nor­mally de-energized and the fault relay is normally ener­gized. The LEDs can be tested periodically by pressing
the LAMP TEST pushbutton. It is not necessary for the
controller to be in the TEST mode when this test is being
performed, however, depressing the LAMP TEST push­button will disable the outputs and reset the operating
program. After the pushbutton is released, a fault condi­tion remains until reset is complete and the controller
restarts (i.e., the fault relay drops out for 2 seconds).

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-energized (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.

Fire Response

Four output relays are provided for controlling fire
response devices. Two relays are designated as

“Alarm” and two as “Fire.” Alarm relays 1 and 2 are
directly controlled by detectors 1 and 2, respectively.
When either detector generates a fire signal that lasts
for two consecutive gates (regardless of the number of
gates that the controller has been programmed for):

— The ALARM LED flashes (approximately four times

per second).

— The corresponding alarm (instant) relay is ener-

gized.

— The corresponding DETECTOR LED flashes to iden-

tify the detector responding to flame.

When the signal from the detector meets all the pro­grammed STAR logic requirements for a fire output, the
appropriate fire relay(s) will also be actuated.

The grouping of the detectors into Individual or
Combined fire zones determines whether the fire relays
are actuated individually or together. When the con­troller is programmed for Individual fire zone operation,
each detector controls its corresponding fire relay.
When the controller is programmed for Combined fire
zone operation, a fire at either detector will cause both
fire relays to be energized simultaneously.

The FIRE ZONE LEDs flash to signal actuation of their
corresponding fire relay.

If the controller is programmed for latching outputs:
— The DETECTOR LEDs flash while the signal thresh-

old requirements are met (fire being detected) and
are on steady after the fire is no longer detected.

— The relays remain energized until the fire is extin-

guished and the controller is reset.

If the controller is programmed for non-latching opera­tion:

— The LEDs flash and the output relays are actuated

only while the fire signal exceeds the minimum
threshold requirements (2 consecutive gates for
alarm, the programmed number of gates for fire out­put). When the threshold requirements are no
longer met, the LEDs are on steady until the con­troller is reset.

Fault Detection

The Automatic oi feature continuously checks the
cleanliness of the detector viewing windows and the
sensitivity of the sensors. In addition, automatic diag­nostic circuitry in the controller monitors the system for

6

various faults 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 can be used to activate an external fault
annunciation device or to remove 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
problem has occurred.

Programming Switches

Rocker switches that are located on the side of the con­troller are used for selecting various options available
with the R7495D. 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
(one or two).

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

3. Fire zone grouping.

4. Latching/non-latching outputs.

Field Wiring Connector

The R7495D Controller is furnished with a field wiring
connector 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.

Figure1 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.

POWER CONSUMPTION—

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

RELAY CONTACT RATING—

Five form C (NO/NC) relay outputs, rated 3 amperes at
up to 30 vdc or up to 250 vac. Dry nitrogen gas is

0°

15°

30°

45°

15°

30°

45°

A1461

100

90

80

70

60

50

40

30

20

10

DETECTION

DISTANCE

(PERCENT)

100% REPRESENTS THE MAXIMUM DETECTION DISTANCE FOR A 

GIVEN FIRE. THE SENSITIVITY INCREASES AS THE ANGLE OF 

INCIDENCE DECREASES.

7 95-8331

Figure 4—Cone of Vision

sealed inside the relays to eliminate arcing and corro­sion, thereby increasing reliability.

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—

R7495D Controller

4.4 pounds (2.0 kilograms)

C7052J Detector

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

OPTIONS

Power supplies are available for operating the R7495D
and C7052J from line (mains) voltage.

The 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. See Figure 18.
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.

T2P/Q1201 Laser with holder for sighting and identifying
the detector cone of vision.

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 indi-

8

Figure 5—Detector Dimensions in Inches (Millimeters)

C1047

3.38 (85.8 MM) 7.11 (181 MM)

7.81

(198 MM)

2.5 DIA.
(64 MM)

5.25

(133 MM)

CONDUIT ENTRY 3/4 NPT OR 25 MM

vidual 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.

A1020

10.0 INCHES (254 MM)

2 INCHES

(50 MM)

7 INCHES

(177 MM)

9 95-8331

Figure 6—Controller Dimensions in Inches (Millimeters)

5-1/4 INCHES

(133 MM)

2-1/2 INCHES

(64 MM)

MOUNTING BASE

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

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

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

JUNCTION BOX MOUNTING
BRACKET (ATTACHES
WITH TWO ENCLOSED
FLATHEAD SCREWS)

B1303

Figure 7—Q9001G Swivel Mounting Bracket Dimensions

5-1/4 INCHES

(133 MM)

2-1/2 INCHES

(64 MM)

MOUNTING BASE

2–1/2 (64 MM) DIA.

0.25 (6.4 MM)
DIA. (3)

120

° ± 2° (2)

2.00 (50.8 MM) DIA.

B1303

B1303

Figure 8—Mounting Base Dimensions

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
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 radia-

tion 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 oi test feature is designed to register an oi 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.

The C7052J uses a single frequency IR sensing device
with detection limited to the hot CO2emission 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.

10

Table 1—C7052J Typical Response Distances

Fuel Distance from C7052J5
Acetone 45 feet (13.7 meters)

Diesel 40 feet (12.2 meters)
Gasoline 50 feet (15 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)
Methane 35 feet (10.7 meters)
Methanol 35 feet (10.7 meters)
Wood Shavings (Excelsior) 50 feet (15 meters)
Wood Stack (Crib) 50 feet (15 meters)

Figure 9—Blackbody Spectral Emittance

10

4

10

3

10

2

10

1

1

10

–1

10

–2

10

–3

10

–4

0.4

0.6 0.8 1 2 4 6 8 10 20 30

RADIANT EMITTANCE

WATTS

(CM ) (MICRON)

2

6000°K

2000°K

250°K

500°K

300°K

4000°K

1000°K

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 oi 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.

95-8331

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 fire­causing 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

11

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
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 by means of 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 oi test lamps are not in a position
that would make the detector overly susceptible to o

i

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. See Figure 11 for an example of
vertical detector mounting.

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.

12

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 A­lead, 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 detector to
controller wiring.

PROVIDE ENOUGH CABLE
FOR ADJUSTMENT OF SWIVEL

CONDUIT SEAL

A1478

Figure 11—Vertical Detector Mounting

13 95-8331

oi RING OPENING DOWN

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.

*

o

i

TEST LAMPS AT TOP OR SIDE

o

i

TEST LAMP

*o

i

TEST LAMP (2)

IR SENSOR HOUSING

UV SENSOR HOUSING

A1462

Figure 10—Front View of the C7052 Detector

14

Figure 13—Detector Terminal Block

D0947

+24 VDC (A)

OUTPUT SIGNAL (B)

CIRCUIT GND (C)

oi SIGNAL (D)

EARTH GND

Figure 12—C7052J Detector Part Identification

F0946

JUNCTION BOX

JUNCTION BOX COVER

MOUNTING PIN

IR TEST LAMPS (2)

O-RING

IR SENSOR HOUSING

IR oi RING

INDEX PIN

UV SENSOR MODULE

O-RING

UV TEST LAMP OPENING

UV SENSOR HOUSING

UV oi RING

IR SENSOR MODULE

UV TERMINAL BLOCK

a. Connect the B-lead shields to the chassis

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.

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: 1) 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), 2) 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).

15

95-8331

1
2
3
4
5

A
B
C
D

31
32
33
34
35
36

24 VDC
POWER

SUPPLY

–

+

43
44

DETECTOR

NO. 1

C7052J

A
B
C
D

DETECTOR

NO. 2

C7052J

J2

J1

REMOTE

RESET

CHASSIS (EARTH) GROUND

CHASSIS GROUND

D1
D2

B1
B2

CKT GND

0.47µf

B1088

Figure 14—Detector Connection

BLIND HOLE

COVER

LOCKING

ASSEMBLY

CATCH

CLAMP
SCREW

STRAP

BARREL

LENS CAP

A1078

Figure 15—Cover Locking Assembly (Optional)

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

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 oi rings by following the instruc­tions in the “Maintenance” section of this manual.

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

16

Figure 16—Jumper Plug

JUMPER "J"

A1702

A1331

IR MODULE

4–WIRE CONNECTOR PLUG

Figure 17—IR Module with Four-Wire Connector

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 R7495D 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, or 4 units. These mounting
cages can also house relay output modules, voltage
converters, or other micro-module equipment that is
used in conjunction with the R7495D 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 R7495D Controller and C7052J Detectors
may be furnished by external 24 volt batteries, a regu­lated dc power supply, or optional Det-Tronics voltage
converters. The R7495D is designed to operate on +18
to +32 vdc.

Terminal 1 — Connect to the positive (+)

side of an external 24 vdc
power source (+18 to +32
vdc).

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.

17 95-8331

(A)

(B)

(C)

1.48 (37.59)

(D)

A1475

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

(E)

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

RACK PART NUMBER CONTROLLER

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

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

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

Terminal 4 — Do not use.
Terminal 5 — Chassis Ground
Terminals 6 to 11 — Relay contacts - Fire Relay No.

1.

Terminals 12 to 17 — Relay contacts - Fire Relay No.

2.

Terminals 18 to 20 — Relay contacts - Alarm Relay

No. 1.

Terminals 21 to 23 — Relay contacts - Alarm Relay

No. 2.
Terminals 24 to 26 — Relay Contacts - Fault Relay.
Terminal 31 — External Reset. To reset the

system from a remote location,

connect switch (normally open)

between terminals 31 and 32.
Terminals 32 and 33 — Circuit ground.
Terminal 34 — Do not use.
Terminal 35 — Connect to the D-lead (oi driv-

er) of Detector No. 1.
Terminal 36 — Connect to the D-lead (oi driv-

er) of Detector No. 2.
Terminal 43 — Connect to the B-lead (signal)

of Detector No. 1.
Terminal 44 — Connect to the B-lead (signal)

of Detector No. 2.

PROGRAMMING THE CONTROLLER

The R7495D 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 (1
or 2).

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

3. Fire zone grouping.

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.

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.

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 R7495D are not used. These rockers
should be left open.)

Detector Selection - Rocker Switches 1-1 and 1-2

The number after the dash corresponds to the channel
number. 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 oi test
sequence, and any faults occurring in its circuitry or
wiring will not be indicated.

18

J2

J1

1
2
3
4
5
6
7
8

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

31
32
33
34
35
36

43
44

+
–

NOT USED
NOT USED

CHASSIS GROUND

NORMALLY CLOSED

NORMALLY OPEN

COMMON

NORMALLY CLOSED

NORMALLY OPEN

COMMON

NORMALLY CLOSED

NORMALLY OPEN

COMMON

NORMALLY CLOSED

NORMALLY OPEN

COMMON

NORMALLY CLOSED

NORMALLY OPEN

COMMON

NORMALLY CLOSED

NORMALLY OPEN

COMMON

NORMALLY CLOSED

NORMALLY OPEN

COMMON

EXTERNAL RESET
CIRCUIT GROUND
CIRCUIT GROUND
NOT USED
D1
D2

B1
B2

FAULT*

RELAY

ALARM

RELAY

NO. 1

ALARM

RELAY

NO. 2

FIRE

RELAY

NO. 2

FIRE

RELAY

NO. 1

+24 VDC INPUT

SIGNAL INPUTS

(B-LEADS)

oi DRIVERS

(D-LEADS)

THE FAULT RELAY, SHOWN DE-ENERGIZED,
IS NORMALLY ENERGIZED IN THE NORMAL OPERATING MODE
WITH NO FAULTS OCCURING

*

B1055

Figure 19—Controller Terminal Configuration

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 3-8
(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.

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).

19 95-8331

Figure 20—Rocker Switch Setting

B1053

SWITCH ASSEMBLY 3

COUNT SELECTION

CLOSE ROCKERS TO ACTIVATE

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

VALUES OF ROCKERS CLOSED

ARE ADDED TOGETHER – 2 COUNTS MINIMUM

IF GATE IS GREATER THAN OR EQUAL

TO 0.5 SECOND, A MULTIPLICATION FACTOR

MUST BE USED.

CONSECUTIVE GATE SELECTION

CLOSE ROCKERS TO ACTIVATE

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

VALUES OF ROCKERS CLOSED

ARE ADDED TOGETHER – 2 GATES MINIMUM

SWITCH ASSEMBLY 2

GATE LENGTH

CLOSE ROCKERS TO ACTIVATE

VALUES OF ROCKERS CLOSED

ARE ADDED TOGETHER

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.

NOTE 1:

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

NOTE 2:

SWITCH ASSEMBLY 4

FIRE ZONES
ROCKER 1 –

INDIVIDUAL RESPONSE

WHEN ROCKER IS CLOSED,

COMBINED WHEN ROCKER IS OPEN.

OUTPUTS LATCHING

ROCKER 5 –

LATCHING OUTPUTS WHEN ROCKER IS OPEN

ROCKERS 2 AND 6 NOT USED

SWITCH ASSEMBLY 1

DETECTOR SELECTION SWITCH

PLACE ROCKER IN OPEN POSITION

FOR EACH CHANNEL WITH A DETECTOR CONNECTED

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

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 rejection.

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

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 second
Rocker 2-6 - 1 second
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 is used, 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

SIGNAL

FLAME

C7052J

STAR LOGIC (TYPICAL SETTINGS SHOWN)

CONTROLLER

ALARM

CONDITION

COUNT (SIGNAL)

4 COUNTS PER GATE

4 CONSECUTIVE GATES

0.25 SECOND GATE LENGTH

A1708

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

20

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

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
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 rock-

ers 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 - Rocker Switches 4-1 to 4-2

Rocker Switch 4-1

Closed = individual
Open = combined

Rocker Switch 4-2

Not used - leave open

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

Open = latching
Closed = non-latching

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

Rocker Switch 4-6

Not used - leave open
When the proper position for each of the rocker switch-

es 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.

Figure 14 illustrates the standard method of connecting
detectors to the controller. All cable shields are tied
together and connected to circuit ground, terminal 33.
A switch (normally open) can be connected between
terminals 31 and 32 to perform a system reset from a
remote location.

The following examples show all relay contacts in the
normal operating condition after the system is reset. To
reset the system, switch the faceplate toggle switch
from NORMAL to TEST and back to NORMAL, or press
the RESET/LAMP TEST pushbutton.

21 95-8331

START

ROCKER 2–8

CLOSED?

ROCKER 2–7

CLOSED?

ROCKER 2–6

CLOSED?

ROCKER 2–5

CLOSED?

YES

YES

YES

YES

MULTIPLY BY 16

MULTIPLY BY 8

MULTIPLY BY 4

MULTIPLY BY 2

A974

NO

NO

NO

Figure 22—Multiplication Factors

Figure 24 shows power connected to a load circuit
through the normally closed contacts of the Alarm relay.
When a “fire” signal is received by the controller, the
contacts open, removing power from the load.

Power is connected to a process or system control cir­cuit through the normally closed contacts of the Fault
relay. When a system fault occurs or when the con­troller is in the Test mode, the contacts open, removing
power from the process. An alarm circuit is connected
to the power source through the normally open contacts
of the Fault relay. When a system fault occurs, the con­tacts close, powering the alarm.

Figure 25 depicts a similar output circuit, with a normally
unenergized load connected to the Fire relay.

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.

22

SWITCH 1

DETECTOR SELECT

SWITCH 3

CONSECUTIVE GATE

SELECTION

SWITCH 3

COUNT SELECTION

SWITCH 2

GATE LENGTH (SECONDS)

SWITCH 4 - 5

OUTPUTS LATCHING

SWITCH 4 - 1
FIRE ZONES

ROCKER OPEN CLOSED

ROCKER OPEN CLOSED

ROCKER OPEN CLOSED

ROCKER OPEN CLOSED

ROCKER OPEN CLOSED

ROCKER OPEN CLOSED

1
2
3
4
5
6
7
8

1
2
3
4

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

1 (1 COUNT)
2 (2 COUNTS)
3 (4 COUNTS)
4 (8 COUNTS)

5
6
7
8

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

1 – 0.031
2 – 0.062
3 – 0.125
4 – 0.25
5 – 0.5
6 – 1.0
7 – 2.0
8 – 4.0

1
2
3
4
5
6
7
8

OPEN SWITCH FOR EACH

DETECTOR CONNECTED

ADD VALUE OF CLOSED

ROCKERS – 2 GATES MINIMUM

ADD VALUE OF CLOSED
ROCKERS – 2 COUNTS MINIMUM
– USE MULTIPLICATION FACTOR

IF GATE IS 0.5 SECOND OR GREATER

ADD VALUE OF

CLOSED ROCKERS

OPEN = LATCHING

OPEN

B0994

1
2
3
4
5
6
7
8

OPEN

1
2
3
4
5
6
7
8

OPEN

1
2
3
4
5
6
7
8

OPEN

OPEN = COMBINED RESPONSE

CLOSED = INDIVIDUAL RESPONSE

Figure 23—System Layout Chart

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 turn on.

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 corresponding
DETECTOR LED flashes rapidly to identify the
detector under test.

If the requirements are met, the appropriate ALARM
LED and FIRE ZONE LED are also illuminated.

3. Turn off the UV/IR source. If turned on, the ALARM
LED and FIRE ZONE LED(s) continue to flash if
latching outputs are selected and are on steady if
not selected. The DETECTOR LED is on steady.

4. Repeat steps 2 and 3 for the other detector in the
system.

5. 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.

6. 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 keyswitch 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

two DETECTOR LEDs will turn on, and depending
on the Fire Zone switch settings, one of the FIRE
ZONE LEDs may turn on. 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
(sometimes barely detectable to the human eye) can
significantly reduce the sensitivity of the detector. The
windows and oi 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.

23 95-8331

17
18
19
20
21
22
23
24
25
26

ALARM

RELAY

NO. 1

FAULT RELAY

FAULT RELAY SHOWN

IN NORMAL (ENERGIZED) CONDITION

A1057

FAULT

ALARM

LOAD

PROCESS
CONTROL

(+)H

(

–)N

Figure 24—Normally Energized Load Circuit Connected to Alarm Relay

8

9
10
11
12

23
24
25
26
27

FIRE

RELAY

NO. 1

FAULT RELAY

FAULT RELAY SHOWN

IN NORMAL (ENERGIZED) CONDITION

A1058

FAULT

ALARM

LOAD

PROCESS
CONTROL

(+)H

(

–)N

Figure 25—Normally Unenergized Load Circuit Connected to Fire Relay

Remove the oi 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 oi rings (the surface of the
ring that faces the detector viewing window). When re­installing an oi 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 re­installing 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
005143-001, 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 oi 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 sensor

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 O-ring is fully
seated to ensure explosion-proof and watertight
integrity of the housing.

g. Inspect the viewing windows and oi rings and clean

if necessary. Also check the position of the o

i

rings.

h. Perform the “Startup Procedure” before returning

the system to normal operation.

TROUBLESHOOTING

Table 3 is intended to aid maintenance personnel in
locating the cause of a system malfunction. The
R7495D Controller and plug-in detector modules are not
designed to be repaired in the field. If repairs are need­ed, the device should be returned to the factory.

24

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.

Return all equipment transportation prepaid to the facto­ry in Minneapolis.

ENGINEERING SPECIFICATIONS

The UV/IR flame detection system shall have a micro­processor-based controller that can operate 1 or 2
detectors and provide relay outputs. 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 alu-

minum enclosure.1The detector shall be the Det-

Tronics model C7052J, no equal. The controller shall
be the Det-Tronics model R7495D Controller that fits in
the Det-Tronics model Q4004 Mounting Rack, which is
designed to fit standard 19 inch racks, no equal.

The UV/IR flame detector shall have one 3/4 inch NPT

2

entry for field wiring.

The controller shall have visual annunciation of fire and
fault conditions. The controller shall have two red LEDs
for individual detector alarm indications, one green LED
for power indication, one amber LED for fault indication,
two red LEDs for fire zone output indication, and one
red LED for alarm indication. The controller shall have
relay outputs through a plug-in backplate connector.

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 an 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 environmental conditions. The UV/IR flame detec­tor shall meet MIL-STD 810C for vibration and 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 approved.

3

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.

25 95-8331

Table 3—Troubleshooting Guide

Indication Status

FAULT LED on Mode switch in Test position, external reset

activated, or fault in controller circuitry.

FAULT LED oi fault - the o

i

ring and/or the window of the
and a detector indicated by the DETECTOR LED
DETECTOR is dirty, the detector tube module has lost
LED on sensitivity or is missing, or there is an open or

shorted wire between that detector and the
controller.

FAULT LED One or more detectors are responding to a
off and any radiation source that is not large enough to
DETECTOR LED reach the fire threshold programmed into
blinking slowly the controller, or one or more detectors may

be overly sensitive.

POWER LED off No power to controller.

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:

— R7495D 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
— W8067 Long Range 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)

003895-002 1 per 10 detectors

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

Junction box 004432-001 1 per 10 detectors
circuit board

O-rings 107427-004 4 per 10 detectors

Grease 005143-001 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]

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