Honeywell C7915A, C7915A1010, C7915A1036, C7915A1028 Information
65-0292-06
C7915A Infrared Flame Detector
PRODUCT DATA
• Mounts easily on a standard 3/4 inch sight pipe.
• The infrared sensor plugs into an electrical socket in the
C7915A assembly and is field replaceable.
• The lead sulfide photocell’s sensitivity to infrared radiation
is compatible with a wide range of flame supervisory
applications.
• Flexible metal cable protects and electrically shields the
detector coaxial cables.
• Accessories available include a heat block, seal-off
adapter, reducer bushing, and orifice plate.
• Immune to x-ray testing.
SPECIFICATIONS
STANDARD MODELS
MODELS: See Table 6 for flame safeguard controls and asso-
ciated amplifiers.
DETECTOR RESPONSE: Responds to infrared radiation with
APPLICATION
The C7915A Flame Detector includes a lead sulfide photocell
that is sensitive to the infrared radiation emitted by the
combustion of fuels such as natural gas, oil, and coal.
• Particularly suitable for combination or dual-fuel
applications.
• When installed properly, can supervise the pilot flame and/
or the main burner flame.
wavelengths between 0.75 and 1.0 micron.
LEAD SULFIDE PHOTOCELL: Photo conductor resistance
decreases as incident radiant energy increases.
AMBIENT TEMPERATURE RATING: -40°F to 125°F (-40°C to
52°C) maximum at the lead sulfide photocell.
MOUNTING:
C7915A Mount—knurled collar with 3/4-14 NPSM internal
threads for mounting on a standard 3/4 in. pipe (see Fig. 1).
32007255-001 Lead Sulfide Photocell—two leads for inserting
into socket in C7915A (see Fig. 8).
Contents
Application ........................................................................ 1
Specifications ................................................................... 1
Ordering Information ........................................................ 2
Operation .......................................................................... 3
Installation ........................................................................ 3
Wiring ............................................................................... 8
Adjustments and Checkout ............................................... 10
Troubleshooting ................................................................ 11
C7915A INFRARED FLAME DETECTOR
Table 1. Models Available
Coaxial Cable
Components Included
Length
Model
(in.) (m)
Lead Sulfide Cell
50019469-001
Bushing With
Magnifying Lens
105134
Orifice
a
Plate
105061
Heat Block
390427A
Reducer
b
Bushing
C7915A1010 30 0.76 32007255-001 X X
C7915A1036 96 2.44 32007255-001 X X
C7915A1028 48 1.22 32007255-001 X X X X
a
With 0.125 in. (3.175 mm) diameter hexagonal orifice to reduce the detector field of view.
b
To insulate the detector from sight pipe temperatures higher than -40°F–125°F (-40°C–52°C) and up to 250°F (121°C).
c
To mount the detector on a 1/2 in. sight pipe, specifically to replace Fireye™ lead sulfide infrared flame detectors.
c
WIRING CONNECTIONS
Nominal 48 in. (1.22 m) coaxial cables—rated for 194°F
(90°C); terminated—one blue and one white.
Coaxial cables enclosed in flexible metal cable—3/8 in. (9.6
mm) maximum outer diameter.
DIMENSIONS: See Fig. 1.
SIL 3 CAPABLE:
The C7915 when used with a R7852B Ampli-check amplifier
in Relay Module EC7810A, 20A, 30A, 40L, 50A;
RM7800[E,G,L,M], 30A, 38[A,B,C], 40[E,G,L,M] 50A,
90[A,B,C,D], 97[A,C], 98A is SIL 3 Capable in a properly
designed Safety Instrumented System. See form number
65-0312 for Certificate Agreement.
APPROVALS:
Underwriters Laboratories Inc. listed: File No. MP268.
Canadian Standards Association certified: Master file LR-
95329-1.
Factory Mutual approved.
Swiss Re (formerly Industrial Risk Insurers): acceptable.
IMPORTANT:
Caution, stickers, form 96-610, are included with the
C7915A. Underwriters Laboratories Inc. requires that
this sticker be placed on any junction box in which
C7915A coaxial cables are connected. The sticker
prohibits routing any other wiring through the junction
box.
REPLACEMENT PARTS:
32007255-001 Lead Sulfide Photocell
50019469-001 Bushing with Focusing Lens
105061 Heat Block to insulate the detector from sight pipe
temperatures higher than 125°F (52°C) and up to 250°F
(121°C).
390427A Reducer Bushing, to mount the detector on a 1/2 in.
sight pipe; specifically to replace Fireye™ lead sulfide infrared flame detectors.
ACCESSORIES:
105172A Seal-Off Adapter; with glass window to prevent hot
gases from reaching the lead sulfide photocell.
118367A Swivel Mount; provides adjustable positioning of the
C7915A.
Hookup Cable—R1298020; 2-wire, heat- and moisture-resis-
tant, No. 20 AWG, Teflon (TFE) insulated; rated up to
400°F (204°C) for continuous duty; tested for operation up
to 600 volts and breakdown up to 7500 volts.
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information,
or would like to comment on our products or services, please write or phone:
1. Your local Honeywell Environmental and Combustion Controls Sales Office (check white pages of your phone directory).
2. Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
3. http://customer.honeywell.com or http://customer.honeywell.ca
International Sales and Service Offices in all principal cities of the world. Manufacturing in Belgium, Canada, China, Czech
Republic, Germany, Hungary, Italy, Mexico, Netherlands, United Kingdom, and United States.
65-0292-06 2
C7915A INFRARED FLAME DETECTOR
C7915A
MOUNT
105061
HEAT BLOCK
105172A
SEAL-OFF ADAPTER
105134
ORIFICE
PLATE IN
3/4 INCH
COUPLING
3/4 INCH
SIGHT PIPE
3/4 - 14 NPSM
INTERNAL THREADS
3/4 INCH PIPE NIPPLE
FOCUSING
LENS
COLLAR,
3/4 - 14 NPSM
INTERNAL THREADS
50019469-001
BUSHING
INSTALLING OR REPLACING A C7915A AND ACCESSORIES
1 [32]
1
4
1 [32]
1
4
1
4
2 [58]
1
[43]
11
16
1
[41]
5
8
9
16
[14]
17
32
[13.5]
9
16
[14]
3/4 - 14 NPSM
EXTERNAL THREADS
1 [32]
1
4
3/4 - 14 NPSM
INTERNAL THREADS
3/4 - 14 NPSM
EXTERNAL THREADS
C7915A
MOUNT
105061
HEAT BLOCK
3/4 - 14 NPSM
INTERNAL THREADS
FOCUSING
LENS
COLLAR,
3/4 - 14 NPSM
INTERNAL THREADS
1 [32]
1
4
1 [32]
1
4
1
4
2 [58]
1
[41]
5
8
9
16
[14]
3/4 - 14 NPSM
EXTERNAL THREADS
1/2 INCH
SIGHT PIPE
390427A
REDUCER
BUSHING
3/4 - 14 NPT
EXTERNAL THREADS
1/2 - 14 NPT
INTERNAL THREADS
REPLACING A FIREYE LEAD SULFIDE DETECTOR
M23448A
1
[27]
1
16
1
[29 ]
5
32
50019469-001
BUSHING
Fig. 1. Mounting dimensions of C7915A Infrared Flame Detector and accessories, in inches. (mm).
OPERATION
OPERATION OF INFRARED
DETECTORS
Infrared detectors can be used with gas, oil, coal, or dual-fuel
flames. Since more than 90% of the total flame radiation is
infrared, these detectors receive ample radiation and can
detect weak flames as well as flames of higher intensity.
The lead sulfide cell used in the detector cannot distinguish
between the infrared radiation emitted by hot refractory and the
infrared radiation from a flame. Therefore, the infrared
detection system includes an amplifier that responds only to
the flickering characteristic of flame radiation and rejects the
steady radiation characteristic of hot refractory.
Unfortunately, smoke or fuel mist within the combustion
chamber can intermittently reflect, bend, or block the hot
refractory radiation, thus making it fluctuate. This fluctuating
action can simulate the flickering radiation from a flame, and
infrared radiation may be present even after the refractory has
visibly stopped glowing. Therefore, be very careful when
applying an infrared detection system to be sure it responds
only to flame.
CELL CONSTRUCTION
The photosensitive material used in the infrared detector is
lead sulfide. The electrical resistance of lead sulfide decreases
when exposed to infrared radiation. If a voltage is applied
across the lead sulfide photocell, current flows when the cell is
exposed to infrared radiation.
INSTALLATION
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced flame safeguard
control service technician.
4. After installation is complete, check out product operation as provided in these instructions.
3 65-0292-06
C7915A INFRARED FLAME DETECTOR
CAUTION
Electrical Shock Hazard.
Disconnect power supply before beginning installation
to prevent electrical shock and equipment damage;
there may be more than one disconnect.
All wiring must be NEC Class 1 (line voltage).
Use the C7915A only with Honeywell lead sulfide
photocells (part no. 32007255-001) and flame signal
amplifiers specified (see Table 6).
NOTICE
Per industry standards, a conduit seal or a cable type that is
sealed is required to be installed in a device that can result in
flammable gas or flammable liquid flow through a conduit or
cable to an electrical ignition source in the event of a seal
leakage or diaphragm failure.
Proper flame detector installation is the basis of a reliable
flame safeguard installation. Refer to the burner manufacturer
instructions and instructions below. Carefully follow instructions
for the best possible flame detector application.
BASIC REQUIREMENTS
Because all flames produce infrared radiation, a C7915A
Infrared (lead sulfide) Flame Detector can be used to prove the
presence of a flame in a combustion chamber. The detector is
mounted outside the combustion chamber. Screw the
mounting collar to one end of a sight pipe inserted through the
wall of the combustion chamber. The lead sulfide photocell in
the detector sights the flame through the sight pipe.
SIGHTING
The infrared detector must continually sight a stable portion of
the flame being detected. The detector is commonly applied to
detect both the gas pilot and main gas flame, or the gas pilot
and main oil flame.
In either case, the detector must be
carefully aimed at the intersection of the pilot and main flame
A Swivel Mount (Honeywell part no. 118367A) is available to
facilitate flame sighting after the C7915A is mounted.
FIELD OF VIEW
A lead sulfide photocell, like other photocells, views an area
rather than a point. It is unable to pinpoint pilot flame location
as easily as a flame rod.
flame, it must view only a part of the flame so it can detect the
pilot only when it is large enough to successfully light the main
burner
. The viewing area must not be so large that a weak and
wavering pilot flame could energize the photocell and cause
the flame relay to pull in.
The area viewed by the photocell depends on:
1. Diameter of the opening in front of the cell.
2. Distance from the cell to the opening.
3. Distance from the opening to the area to be viewed.
Fig. 2 shows three ways of reducing the field of view, assuming
that the distance from the viewing opening to the flame or
refractory cannot be changed. These are (1) lengthening the
sight pipe, (2) reducing the diameter of the sight pipe, and (3)
installing an orifice plate in front of the photocell. Combinations
of these methods can be used.
If the detector is to prove only the pilot
.
When a flame is present, the lead sulfide photocell detects the
infrared radiation generated. The C7915A produces an electric
signal that is sent to the amplifier in the flame safeguard
control. The amplified signal pulls in the flame relay in the
flame safeguard control to allow proper operation.
Because it is necessary for the detector to actually see the
flame, it is best to locate the detector as close to the flame as
physical arrangement, temperature, and other restrictions
permit. These restrictions are described in detail below.
DETERMINE THE LOCATION
Before beginning the actual installation, determine the best
location for mounting the flame detector. Carefully consider the
factors discussed in this section before establishing the
location.
TEMPERATURE
The sensitivity of the lead sulfide cell decreases as its
temperature increases. Up to 125°F (52°C), the loss in
sensitivity is negligible, but temperatures above this point
be avoided
. Under normal temperature conditions (below
125°F (52°C), the life of the lead sulfide cell should be
unlimited. The quickest check for excessive temperature is
simply to grasp the detector—it should not be too hot to hold
comfortably in your bare hand.
Several methods are available for cooling the lead sulfide
photocell including ventilating the sight pipe and installing a
pipe nipple, seal-off adapter, and/or heat block between the
sight pipe and the detector. Refer to Installing Accessories,
page 7.
must
CHANGING PIPE LENGTH OR SIZE
(DIAMETER)
The effect or changing the length of the sight pipe is shown in
Table 2 and 3.
Changing the diameter of the sight pipe is not as simple as
changing the length, because the C7915A mount and
mounting accessories are all sized for 3/4 in. pipe. When the
sight pipe diameter is reduced, the effect is the same as adding
an orifice plate to the pipe as discussed below.
REFRACTORY
DESIRED VIEWING
AREA
UNRESTRICTED VIEW
BY LENGTHENING
(1)
THE SIGHTING PIPE
BY DECREASING THE
(2)
PIPE SIZE (DIAMETER)
BY INSTALLING
(3)
AN ORIFICE PLATE
Fig. 2. Methods of reducing C7915A Detector field-of-view.
M3049C
65-0292-06 4
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