Honeywell C7961E, C7961F Product Data
C7961E,F Dynamic Self-Check
C7961F
C7961E
Ultraviolet Flame Detector
PRODUCT DATA
• Detectors can be mounted horizontally, vertically or at
any other angle.
• Quartz viewing window is field replaceable.
• Threaded conduit fitting and color-coded leadwires
allow rapid electrical installation.
• 3/4 in. and 1 in. NPT mounting models available.
• Models available with Molex Woodhead
1R5006A20A120 (Formerly Brad Harrison® 41310)
connector.
• A swivel mount is available to facilitate flame sighting.
• -40°F (-40°C) rated ultraviolet sensing tube.
• Incorporates UV sensor tube checking feature; used
with R7851C Dynamic Self-check Amplifiers.
• High pressure 50 psi (345 kPa) quartz viewing window,
magnifying lens and antivibration mount are available
as accessories.
• Housing meets NEMA 4 enclosure standards (C7961E).
• Protective heat block built into mounting flange.
• C7961E, F are immune to x-ray.
APPLICATION
The C7961E,F are dynamic self-checking flame detectors for
sensing the ultraviolet radiation generated by the combustion
of gas, oil, or other fuels.
FEATURES
• Oscillating shutter interrupts ultraviolet radiation
reaching the UV sensor at a 3 Hz rate to provide the UV
sensor tube checking function. The 7800 Series
Control conducts an additional shutter test every 5
seconds.
C7961F:
• Housing designed to be explosion-proof and
Underwriters Laboratories Inc. listed for use in
hazardous locations; Class I, groups C and D; and
Class II, groups E, F and G.
• Viewing window rated for 100psi (690 kPa).
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
Installation ........................................................................ 3
Wiring (Fig. 10) ................................................................. 7
Adjustments and Checkout ............................................... 8
Troubleshooting ................................................................ 9
Service ............................................................................. 10
65-0267—09
C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
SPECIFICATIONS
IMPORTANT
The specifications in this publication do not include
normal manufacturing tolerances. Therefore, this unit
may not exactly match the specifications listed. This
product is tested and calibrated under closely controlled conditions, and minor differences in performance can be expected if those conditions are
changed.
Models:
C7961E Dynamic Self-Check Ultraviolet Flame Detector.
C7961F Dynamic Self-Check Ultraviolet Flame Detector.
(Same as C7961E except with explosion-proof housing for
use in hazardous locations).
Electrical Ratings:
Voltage and Frequency: 120 Vac (-15%, +10%), 50/60 Hz.
Ambient Operating Temperature Ratings
(Outside the Case): -40°F to 175°F (-40°C to 80°C).
Storage Temperature Ratings: -60°F to 175°F
(-50°C to 80°C).
Housing:
C7961E: Violet, cast-aluminum cover. Separate mounting
flange (with heat block) and faceplate provide heat insulation and sealoff.
Meets NEMA 4 enclosure requirements (indoor, outdoor pro-
tection; rain-tight, dust-tight, hose-directed water protection).
C7961F: Explosion-proof, two-piece, violet, cast aluminum.
Pressure Rating of Quartz Viewing Window:
C7961E: 20 psi (138 kPa), see Replacement Parts.
C7961F: 100 psi (690 kPa).
Pressure Rating of Quartz Focusing Lens: 20 psi
(138 kPa), see Accessories.
Mounting: C7961E: Mounting flange with 3/4 in. NPT or 1 in.
NPT internal threads for attaching to sight pipe.
C7961E1014, C7961E1022: Mounting flange with 1 inch NPT
internal threads for attaching to sight pipe.
C7961F: Pipe union with 1 inch NPT internal threads for
attaching to sight pipe.
Wiring Connections:
Leadwire: Models with NEC Class 1 color coded
(C7961E1006, C7961E1014).
Length: 8 ft (2.4m).
Threaded Leadwire Faceplate Opening: 1/2-14 NPSM
internal threads for attaching conduit.
Connector: Models with Molex Woodhead 1R5006A20A120
(formerly Brad Harrison® 41310 Connector) (C7961E1022,
C7961E1030).
Dimensions: See Fig. 1.
Weight:
C7961E: 2.6 lbs (1.2 kg).
C7961F: 14.5 lbs (6.6 kg).
SIL 3 Capable:
The C7961 when used with a R7851C self-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 Number MP268,
Guide Number MCCZZ.
Canadian Standards Association Certified: Pending.
Factory Mutual Approved: 14740.01.
SwissRe (formerly Industrial Risk Insurers) Acceptable.
C7961F: For use in hazardous locations; Class I, Groups C
and D; Class II, Groups E, F, and G; File no. E34649.
Replacement Parts:
190971G Shutter Assembly.
C7961E:
114372 Quartz Viewing Window; rated for 20 psi (138
kPa).
114465 Gasket, silicone rubber; for installing viewing win-
dow (three required).
120739 Gasket, fiber-neoprene; heat insulation and
seal-off for mounting flange.
C7961F:
122037 Quartz Viewing Window; rated for 100 psi
(690 kPa).
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.
65-0267-09 2
WARNING
MOUNTING FLANGE
M1963A
FACEPLATE
PIPE
UNION
8
(203)
DIA.
1/2-14 NPT
LEADWIRES
9 (229)
2
(51)
5
(127)
1-11 1/2 NPT
2-1/16
(52)
1-1/2
(38)
5/16-18 UNC-2B BY
7/16 (11) DEEP
MOUNTING HOLES (2)
2 (51)
1 (25)
3
(76)
7-7/32
(183)
3-3/4
(95)
1/2–14 NPSM
LEADWIRES
2
C7961E1014, E1022 1 INCH NPT MODELS
1
C7961E1022, E1030 CONNECTOR MODELS.
2
5-1/8 (130)
3-7/16
(87)
1
3/4–14 NPT
5-1/4 (133)
FACEPLATE
Fig. 1. Dimensions of C7961E in inches. (mm).
C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
4. After installation is complete, check out product operation as provided in these instructions.
Electrical shock hazard.
Can cause serious injury or death.
Disconnect power supply before beginning installation
to prevent electrical shock and equipment damage.
More than one disconnect may be involved.
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.
M24000B
IMPORTANT
1. Do not connect these detectors to non-Honeywell
manufactured controls (primaries, programmers, multiburner systems, and burner management systems).
Unsafe conditions could result.
2. All wiring must be NEC Class 1 (line voltage).
3. Voltage and frequency of the power supply connected
to this detector must agree with the values marked on
the detector.
4. Sight the detector so it does not respond to ignition
spark.
5. On multiburner installations, each detector must
respond only to the flame of the burner it is supervising.
Proper flame detector installation is the basis of a safe and
reliable flame safeguard installation. Refer also to the burner
manufacturer instructions. Carefully follow all instructions for
the best possible flame detection application.
Fig. 2. Dimensions of C7961F in inches. (mm).
Accessories:
C7961E:
118367A Swivel Mount.
123539 Antivibration Mount.
122748 Quartz Viewing Window, rated for 50 psi
(345 kPa).
124204 Quartz Focusing Lens, rated for 20 psi (138 kPa);
increases the detector-sensed ultraviolet radiation.
120934 Mounting Flange, aluminum, with 3/4 inch NPT
internal threads for attaching to sight pipe.
124198 Mounting Flange, aluminum, with 1 inch NPT inter-
nal threads for attaching to sight pipe.
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
service technician.
Basic Requirements
The combustion flames of most carbon-based fuels emit
sufficient ultraviolet radiation to enable the C7961 Solid State
(Purple Peeper) Ultraviolet Flame Detector to prove the
presence of a flame in a combustion chamber. The detector is
mounted outside the combustion chamber with its mounting
flange or union threaded to one end of a sight pipe inserted
through the wall of the combustion chamber. The ultraviolet
sensing tube in the flame detector sights the flame through the
pipe.
When a flame is present, the C7961 senses the ultraviolet
radiation emitted. The C7961 then produces a signal that is
sent to the amplifier in the flame safeguard control. The
amplified signal pulls the flame relay into the control to allow
proper system operation.
Because it is necessary for the C7961 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 in the
following paragraphs.
Determine Location
Before beginning the actual installation, determine the best
location for mounting the detector. Carefully consider the
factors discussed in this section before deciding on the
location.
3 65-0267-09
C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
DETECTOR IN GOOD
SIGHTING POSITION
(LOW ANGLE SIGHTING)
FLAME DEPTHANGLE VIEW
BURNER
NOZZLE
DETECTOR IN POOR
SIGHTING POSITION
FLAME DEPTHPERPENDICULAR VIEW
UNBURNED FUEL
M1956A
Temperature
Install the C7961 where the ambient temperature (outside the
case) stays within the ambient operating temperature ratings.
To keep the C7961 below its maximum rating, it may be
necessary to add additional insulation between the wall of the
combustion chamber and the detector. A shield or screen can
be added to reflect radiated heat away from the detector. If the
detector continues to get too hot, cooling is necessary. Refer to
the Sight Pipe Ventilation section.
Vibration
If the C7961 is subject to excessive vibration, use a special
123539 Antivibration Mount. If you use this mount, install it
before you position and sight the detector.
Clearance
Make sure there is enough room to easily mount the sight pipe,
detector, and all required fittings, and to remove the detector
for troubleshooting and servicing.
Radiation Sources (Other than Flame)
Examples of radiation sources (other than flame) that could
actuate the detection system:
Ultraviolet sources:
Hot refractory above 1800°F (982°C).
Spark:
— Ignition transformers.
— Welding arcs.
— Lightning.
Welding flames.
Bright incandescent or fluorescent artificial light.
Except under unusual circumstances, none of these sources
except hot refractory and ignition spark would be present in or
near the combustion chamber.
The detector can respond to hot refractory above 1800°F
(982°C) if the refractory surface represents a significant
percentage of the detector field of view. If the temperature of
the hot refractory causes the flame relay (in the flame
safeguard control) to pull in, re-aim the sight pipe so the
detector views a cooler area of the refractory.
Ignition spark is an intense source of ultraviolet radiation.
When installing the detector, make sure it does not respond to
ignition spark.
Single Burner Requirements
The detector must have an unobstructed view of a steady part
of the flame it is supervising. This requires a proper sighting
angle and minimized ultraviolet radiation attenuation effects.
However, when supervising only one burner, sighting
requirements are simplified.
Sighting Angle (Fig. 3)
The first 30 percent of a flame closest to the burner nozzle (the
flame root) emits the most ultraviolet energy. Also, if the
detector sights the flame at an angle instead of
perpendicularly, it views more flame depth. Therefore, the best
sighting angle is nearly parallel to the axis of the flame,
permitting the detector to view a large portion of the first 30
percent of the flame closest to the burner nozzle, as illustrated
in Fig. 3.
Low angle sighting permits the detector to view a greater depth
of flame, thus reducing the effects of instabilities in the flame
pattern. Also, the environment near the burner nozzle is
usually cleaner than at any other part of the combustion
chamber. This provides a clearer line of sight and can keep the
viewing window cleaner, thus reducing the maintenance
required.
Solar radiation.
Gas lasers.
Sun lamps.
Germicidal lamps.
Bright flashlight held close to the sensing tube.
Gamma ray and X-ray sources:
The C7961 is immune to x-ray exposure.
65-0267-09 4
Fig. 3. Detector sighting angle.
NOTE: When possible, it is desirable to tilt the detector
and sight pipe downward to prevent the buildup
of soot in the pipe or on the viewing window.
Loading...