65-0304-05
SIL
3
Capable
C7061M Miniature Dynamic SelfCheck Ultraviolet Flame Detector
PRODUCT DATA
FEATURES
• Shutter interrupts ultraviolet radiation reaching the UV
sensor to provide the UV sensor tube checking
function. Amplifier circuitry components are checked
from the microprocessor in the 7800 Series Control.
• Detectors can be mounted -45° to +90° in vertical
direction.
• Ultraviolet radiation sensing tube is field replaceable.
• Threaded conduit fitting and color-coded leadwires
allow rapid electrical installation.
APPLICATION
The C7061M is a dynamic self-checking flame detector for
sensing the ultraviolet radiation generated by the combustion
of gas, oil, or other fuels.
• C7061M1016 uses Molex Woodhead 1R5006A20A120
(formerly Brad Harrison
• Two flame detectors can be wired in parallel to reduce
nuisance shutdowns in difficult flame sighting
applications.
• -4°F (-20°C) to 175°F (80°C) ambient temperature.
• Incorporates UV sensor tube checking feature; used
with R7861 Dynamic Self-check Amplifiers.
• Housing protection is IP66. (similar to Nema IV).
• Integrated collar threaded for mounting on a 1 in. sight
pipe.
• Viewing window rated for 50psi (350 kPa).
®
Type 41310) connector.
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Installation ........................................................................ 3
Ordering Information ........................................................ 2
Wiring ............................................................................... 7
Adjustments and Checkout ............................................... 8
Troubleshooting ................................................................ 10
Service ............................................................................. 10
C7061M MINIATURE 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:
C7061M1008 - with 8 foot (2.4m) leadwires.
C7061M1016 - With connector.
Electrical Ratings:
The C7061 is powered from the Flame Safeguard unit that
delivers the necessary voltages to operate the tube and
shutter.
Ambient Operating Temperature Ratings
(Outside the Case):
-4°F to 175°F (-20°C to 80°C) using part no. 129464N UV
Sensing Tube.
Storage Temperature Ratings:
-4°F to 158°F (-20°C to 70°C).
Housing:
Violet, plastic cover.
Housing protection is IP66. Similar to Nema 4 (indoor, outdoor
protection; rain-tight, dust-tight, hose-directed water protection).
Pressure Rating of Quartz Viewing Window:
50 psi (350 kPa)
Mounting:
Threaded collar (internal 1-11 1/2 NPSM) internal threads for
attaching to a 1 inch sight pipe.
Wiring Connections: (C7061M1008)
Leadwire: NEC Class 1 color coded.
Length: 8 ft (2.4m).
Threaded Leadwire Faceplate Opening:
1/2-14 NPSM internal threads for attaching conduit (avoid
overtightening that could crack the housing).
Connector:
C7061M1016: Molex Woodhead 1R5006A20A120 (formerly
Brad Harrison
Dimensions:
See Fig. 1.
Weight:
1.4 lbs (630 g).
Approvals:
Underwriters Laboratories Inc. Listed: MP268, Guide MCCZ2,
MCCZ8
Factory Mutual approved.
SwissRe (formerly Industrial Risk Insurers) Acceptable.
Replacement Parts:
129464N Ultraviolet Sensing Tube
Accessories:
123539 Antivibration Mount.
204341 Mirror Assembly.
105172C Pressure Sealoff adapter (3/4 in. npt)
118367 Swivel Mount
136733 Heat Block (3/4 in. npt)
SIL 3 Capable:
The C7061M when used with a R7861 Self Check amplifier in
relay module EC7810A, 20A, 30A, 40L, 50; RM7800 [E, G,
L, M], 30A, 38[A,B,C], 40[E,G,L,M], 50A, 88A, 90[A,B],
97[A,C], 98A is SIL 3 Capable in a properly designed
safety instrumented system. See Form number 65-0312
for certificate agreement.
®
Type 41310).
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.
65-0304—05 2
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
CAUTION
WARNING
M29114A
2-9/64 (55)
13/16 (21)
2-21/32
(68)
3-15/32
(88)
1-33/64
(39)
PARALLEL
PIPETHREAD
1-11/2 NPSM
33/64
(13)
2-9/64
(55)
1-35/64
(40)
CONDUIT TUBE CONNECTION
PORT 1/2 NPSM
Fig. 1. Dimensions of C7061M in inches. (mm).
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.
4. After installation is complete, check out product
operation as provided in these instructions.
Equipment damage hazard.
Sensing tube can fail to discriminate between
flame conditions. Change sensing tube after 40,000
hours of continuous use.
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 or diaphragm failure.
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. The C7061 is powered from the Flame Safeguard unit
that delivers the necessary voltages to operate the
sensing tube and shutter.
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.
6. Do not connect more than two C7061 Flame
Detectors in parallel.
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.
Basic Requirements
The combustion flames of most carbon-based fuels emit
sufficient ultraviolet radiation to enable the C7061 (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 nut
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 UV tube in the C7061 senses the
ultraviolet radiation emitted. The C7061 then produces a signal
that is sent to the amplifier in the flame safeguard control. The
amplified signal energizes the flame relay in the control to allow
proper system operation.
3 65-0304—05
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
M29115A
UNBURNT FUEL
GOOD
DEPTH OF FLAME IS LONG WHEN THE
MONITORING DIRECTION INTERSECTS
THE FLAME AXIS AT ACUTE ANGLE
BURNER
BAD
DEPTH OF FLAME IS SHORT
Because it is necessary for the UV sensing tube 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.
Temperature
Install the C7061 where the ambient temperature (outside the
case) stays within the ambient operating temperature ratings.
To keep the C7061 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
The detector withstands normal burner vibration. If the C7061
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.
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 by following the Ignition Spark Response Test
listed on page 9.
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
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. 2.
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.
Radiation Sources (Other than Flame)
Examples of radiation sources (other than flame) that could
actuate the detection system:
1. Ultraviolet Sources:
a. Hot refractory above 2500°F (1371°C).
b. Spark:
c. Ignition transformers.
d. Welding arcs.
e. Lightning.
f. Gas lasers.
g. Sun lamps.
h. Germicidal lamps.
2. Gamma Ray and X-ray Sources:
a. Diffraction analyzers.
b. Electron microscopes.
c. Radiographic X-ray machines.
d. High voltage vacuum switches.
e. High voltage condensers.
f. Radioisotopes.
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 2300°F
(1260°C) if the refractory surface represents a significant
percentage of the detector field of view. If the temperature of
Fig. 2. 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.
In most installations, the detector needs to respond to the pilot
flame alone, then the pilot and main burner flame together, and
finally the main burner flame alone. The detector must meet all
sighting requirements that apply:
• Pilot flame alone—the smallest pilot flame that can be
detected must be capable of reliably igniting the main
burner.
• Pilot and main burner flame together—the detector must
sight the junction of both flames.
• Main burner flame alone—the detector must sight the most
stable part of the flame for all firing rates.
65-0304—05 4
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
Parallel Flame Detectors
Shifting flame patterns, commonly encountered on burners
with high turndown ratios, can require two parallel detectors to
prove the flame at the highest and lowest firing rates and for
modulation in between. In this case, one detector supervises
the pilot (interrupted) and both detectors supervise the main
burner flame. During the main burner run period, either
detector is capable of maintaining system operation. A
maximum of two C7061 Detectors can be connected in
parallel.
In addition to assuring more reliable flame detection, parallel
detectors facilitate maintenance during burner operation. Each
detector can be removed, in turn, without shutting down the
supervised burner. However, a flame simulating failure
occurring in the flame signal amplifier or in either detector will
cause a shutdown.
Screening Effects
Smoke, oil mist, dirt and dust are masking agents that
attenuate the ultraviolet radiation that the flame emits. If they
absorb too much radiation, the amount of ultraviolet radiation
reaching the detector is reduced. The flame signal can then
become too low to hold in the flame relay, resulting in burner
shutdown.
The problem can be eliminated by diluting the contaminants. A
strong flow of air through the sight pipe will clear a viewing path
through the attenuating material. Refer to the Sight Pipe
Ventilation section.
When planning such an installation, locate each flame detector
so that it has the best possible view of the first 30 percent
closest to the burner nozzle (the flame root) it is supervising,
and the worst possible view of all other flames.
Fig. 3 illustrates a critical detector application problem that
requires flame discrimination. Flame discrimination is
accomplished for Detector A by repositioning it until the flame
relay (or Flame LED in the flame safeguard control) does not
respond to Flame B. Note that Detector A is aimed at the first
30 percent of Flame A where the ultraviolet radiation is most
intense. It sights the tip of Flame B, but it is not aimed at the
first 30 percent of Flame B where UV is intense. Detector A is
repositioned to assure maximum response to Flame A while
rejecting Flame B. Similarly, Detector B is positioned to assure
maximum response to Flame B while rejecting Flame A.
If you reposition a detector and still cannot achieve flame
discrimination, try reducing the viewing area by increasing the
length or decreasing the diameter of the sight pipe, or adding
an orifice plate.
DETECTOR A
FLAME A
FLAME B
DETECTOR B
It is also desirable to sight the detector at an area containing
fewer masking agents such as near the burner nozzle or near
the entrance of the combustion air. Increasing the viewing area
of the detector by shortening the sight pipe or by increasing the
diameter of the sight pipe also reduces the attenuating effects
of masking agents.
Multiburner Requirements
(Flame Discrimination)
In addition to meeting the requirements for a single burner, a
multiburner installation requires discrimination between flames.
Flame discrimination can be defined as locating all flame
detectors so that each detector responds only to the flame of
the burner it is supervising.
In multiple burner systems, not every detector can be
positioned so its line-of-sight does not intercept flames from
other burners. For example, this situation occurs in front-fired
boiler-furnaces having more than one row of burners, or in
multilevel opposed-fired furnaces where the burners face each
other.
M1957A
Fig. 3. Example of flame discrimination
problem (opposed fired burners).
Install the Sight Pipe (Fig. 4)
After you have determined the location and sighting angle,
select the sight pipe. A black iron pipe with a diameter of at
least 1-1/2 in. (38 mm) is recommended. Do not use stainless
steel or galvanized pipe because they reflect ultraviolet
radiation internally and complicate aiming the pipe.
Sight pipes with diameters 2 to 3 in. (51 to 76 mm) produce
better results for horizontal rotary burners, which require wide
viewing angles. A wide viewing angle can also be obtained by
using a short sight pipe.
5 65-0304—05
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
BURNER
PLATE
WELD
THIS PART
CONNECTION
NIPPLE (1B)
AIR
TEES
BLACK IRON SIGHT
PIPE [USE 1-1/2 TO
3 INCHES (38 TO
76 MM) DIAMETER].
REDUCING
SOCKET
FURNACE
WALL
TAPERED
MONITORING
HOLE
NOTE: IF AIR PURGING IS NEEDED, ADD PERFORATED NIPPLE OR PIPE TEES TO
SUPPLY VENTILATION.
M29116A
Fig. 4. Typical mounting of C7061M.
Prepare Hole in Combustion Chamber Wall
Cut or drill a hole of the proper diameter for the sight pipe in the
wall of the combustion chamber at the selected location. Flare
the hole to leave room for small adjustments of the sighting
angle. The taper of the hole should be about 1 in. for every 3 in.
(25 mm for every 76 mm) of wall thickness.
Mount Sight Pipe
Thread one end of the pipe to fit the 1 in. mounting nut, or
required coupling. Cut the pipe to the desired length (as short
as practical) and at an angle so it fits flush with the wall of the
combustion chamber. Tack weld the pipe to the wall in a trial
position. Do not weld the sight pipe permanently in place until
after completing the Adjustments and Checkout.
NOTE:If you use 118367A Swivel Mount and you are positive
about the location and sighting angle, you can permanently
weld the pipe.
Install Fittings
In some cases, the sight pipe does not directly fit the C7061
mounting nut. Also, it may be desirable or necessary to
ventilate the sight pipe. You may also want to use a swivel
mount or an antivibration mount. Each of these cases can
require additional fittings.
Reducer
For sight pipes of larger diameter than the mounting nut, install
a reducer as illustrated in Fig. 4. The reducer requires a close
nipple with 1 in. NPT external threads:
Sight Pipe Ventilation
It may be necessary to ventilate the sight pipe to cool the
detector or to clear a viewing path through UV radiation
attenuating material.
For a negative pressure combustion chamber, drilling a few
holes in the section of the sight pipe outside of the combustion
chamber allows air at atmospheric pressure to flow through the
sight pipe and into the chamber. A perforated pipe nipple
between the sight pipe and the detector can also be used.
For a positive pressure combustion chamber, connect a supply
of pressurized air from the burner blower to flow through the
sight pipe and into the chamber. The air pressure must be
greater than the chamber pressure (see Fig. 4).
Mount the Detector
Mount the detector onto the sight pipe, reducer, or other fitting
(see Fig. 4, 5, 6).
NOTE: The C7061 Self-Checking Flame Detectors incor-
porate a shutter mechanism and, therefore,
require special consideration for mounting positions other than vertically sighting downward, as
illustrated in Fig. 5 & 6.
— The C7061 has an arrow indicator on the back of
the cover to facilitate mounting (see Fig. 5). The
arrow must be vertically aligned and pointing
downward.
— The C7061 must be mounted with the conduit
opening located 90 degrees below the horizontal
(see Fig. 5 & 6) pointing down.
— While the C7061 may be mounted as much as 45
degrees below the horizontal plane as shown in
Fig. 5, this may increase the likelihood of soot
buildup on the viewing window.
65-0304—05 6
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
CAUTION
M29117A
UPPER
LIMIT 90º
HORIZONTAL
PLANE
90º
45º
LOWER
LIMIT 45º
VERTICAL
PLANE
MOUNTING
PIPE
MOUNTING
NUT
VERTICAL PLANE
MOUNTING
DO NOT TILT
DO NOT MOUNT
HORIZONTALLY
DO NOT MOUNT
UPSIDE-DOWN
M29118A
NOTES:
1. Be sure the C7061M is properly aligned vertically
when seen from the front. If not, the shutter may
be damaged or malfunction.
2. File any burrs or protrusions from the monitoring
pipe. If the packing in the mounting nut is damaged, any chance of leakage may be caused.
3. Do not use a tool such as a pipe wrench when
tightening the mounting nut. Excessive torque by a
tool could damage the packing and compromise
the seal.
4. Do not adjust the mounting pose by forcibly holding the unit or wiring pipe. Failure to do so may
damage the packing and compromise the seal.
WIRING
Equipment damage hazard.
Improper wiring can permanently damage amplifier.
When using the C7061 and the R7861 Dynamic
Self-Check Amplifier, be careful not to short the white
shutter leadwires together (by wiring incorrectly, leaving
an incorrect jumper wire, or stripping the insulation too
much so the bare leadwires can touch).
Fig. 5. C7061 mounting positions.
To mount a C7061M (see Fig. 6):
1. Hold the unit securely with one hand to prevent it from
rotating.
2. Tighten the mounting nut approximately 4 turns with the
other hand until the unit is held securely in place.
3. Make sure the unit is properly aligned in the vertical
plane when viewed from the front.
Fig. 6. Mounting C7061M Detector.
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.
1. All wiring must comply with applicable local electrical
codes, ordinances, and regulations. Use NEC Class 1
wiring.
2. Keep the flame signal leadwires as short as possible
from the flame detector to the terminal strip or wiring
subbase. Capacitance increases with leadwire length,
reducing the signal strength. The maximum permissible
leadwire length depends on the type of leadwire and
conduit type and diameter. The ultimate limiting factor in
flame signal leadwire length is the signal voltage. Refer
to Table 1.
3. The C7061M1008 detector has color-coded plastic-insulated, no. 18 leadwires, 8 ft (2.4m) long, rated for 221°F
(105°C). These wires must be run in a conduit. The
C7061M1016 has a Brad Harrison® Type 41310 connector.
4. If the leadwires are not long enough to reach the terminal strip or wiring subbase, make the required splices in
a junction box.
5. If splicing is necessary, use moisture-resistant no. 14
wire suitable for at least 167°F (75°C) if the detector is
used with a flame safeguard primary control, or at least
194°F (90°C) if used with a flame safeguard
programming control.
6. For high temperature installations, use Honeywell
specification no. R1298020 wire or equivalent for the F
leadwire. This wire is rated up to 400°F (204°C) for
continuous duty. It is tested for operation up to 600 volts
and for breakdown up to 7500 volts. For the other
leadwires, use moisture-resistant no. 14 wire selected for
a temperature rating above the maximum operating
temperature.
7. Refer to Fig. 7 for wiring connections.
7 65-0304—05
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
WHITE
WHITE
YELLOW
BLUE
(G)
(F)
WIRING MUST BE NEC CLASS 1.
TERMINAL 5 – SHUTTER DRIVE - - - - - - -
TERMINAL 1 – NOT USED
TERMINAL 2 – FLAME OUTPUT - - - - -
TERMINAL 3 – FLAME PUTPUT - - - - -- - -
TERMINAL 4 – SHUTTER DRIVE - - - - - -
1
2
3
4
5
1
AN R7861 DYNAMIC SELF-CHECK AMPLIFIER MUST BE USED.
TWO C7061M DETECTORS CAN BE CONNECTED IN PARALLEL TO THE
SAME TERMINAL.
C7061M1016 ONLY: KEYED CONNECTOR ALLOWS CONNECTION IN ONLY
ONE POSITION.
C7061M1016 ONLY: REFERENCE MOLEX WOODHEAD 1R5006A20A120
(FORMERLY BRAD HARRISON™ 41310 TYPE CONNECTOR).
2
3
4
3
4
7800 SERIES
FLAME
SAFEGUARD
CONTROL WITH
SHUTTER DRIVE
CIRCUITRY
F
G
22
L2
M34066
Fig. 7. Wiring diagram for C7061M Detectors with 7800
Series Flame Safeguard controls with shutter drive
circuitry.
IMPORTANT
Do not run the flame detector wiring in the same
conduit with high voltage ignition transformer wires.
Connecting Detectors in Parallel
For a flame that is difficult to sight, using two parallel C7061
Flame Detectors reduces nuisance shutdowns. If only one of
the parallel detectors loses the flame signal, the other indicates
the presence of the flame and keeps the burner running. When
two parallel C7061 Detectors are used, a flame-simulating
failure in either detector causes the burner to shut down. Two
C7061 Detectors can be connected in parallel to the same
terminals on 120 volt flame safeguard controls. To avoid
exceeding the rating of the solid-state shutter switch in the
R7861 Flame Signal Amplifier, do not connect more than two
C7061 Detectors in parallel.
When the flame detectors are connected in parallel, the low
level background signals are additive. This background signal
increases as the temperature decreases.
IMPORTANT
65-0304—05 8
Voltage and frequency: The C7061 is powered from
the flame safeguard unit that delivers the necessary
voltages to operate the tube and shutter.
ADJUSTMENTS AND CHECKOUT
UV Sensor Tube Test
For initial burner lightoff, consult the burner manufacturer
instructions or the flame safeguard control instructions.
If the system does not start during the initial burner lightoff,
check the UV sensor tube in the flame detector. If a reddish
glow appears when there is no flame present, replace the UV
sensing tube. When performing this test, make sure there are
no extraneous sources of ultraviolet radiation in the test area
[see “Radiation Sources (Other than Flame)” on page 4].
Adjust Detector Sighting
With the flame detector installed and the burner running, adjust
the sighting position of the detector for optimum flame signal.
It is suggested that a volt-ohm meter with a minimum sensitivity
of one megohm/volt and a zero to five or ten Vdc scale be used
for R7861 Amplifier flame signal measurements. Measure the
flame signal as illustrated in
Fig. 8. Be careful to make the proper connections of
positive (red) meter lead to positive (+) control jack and
negative (black) meter lead to negative (-) or (-Com) jack with
7800 Series controls. When the 7800 Series control has a
Keyboard Display Module, a zero to five Vdc voltage is
displayed on the module.
NOTES:
1. The shutter operation may cause fluctuations in
the voltage reading. Read the average stable
reading, disregarding the peaks.
2. The flame signal must be steady (or stable as
described in note 1).
Move the detector and sight pipe around to sight the flame
from various positions and angles. Try to get a maximum
steady (or stable) reading on the meter that is above the
minimum acceptable voltage listed in Table 1.
Measure the flame signal for the pilot alone, the main burner
flame alone, and both together (unless monitoring only the pilot
flame when using an intermittent pilot, or only the main burner
flame when using direct spark ignition). Also measure the
flame signal at low and high firing rates and while modulating in
between (as applicable). With the detector in its final position,
all required flame signals must be steady
(or stable) and as specified in Table 1. If you cannot obtain the
proper signal, refer to the Troubleshooting section.
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
Pilot Turndown Test
When the detector is used to prove a pilot flame before the
main fuel valve(s) can be opened, perform a Pilot Turndown
Test before welding the sight pipe into position. Follow the
procedures in the flame safeguard control instructions and in
the burner manufacturer instructions.
NEGATIVE (–)
METER LEAD
POSITIVE (+)
METER LEAD
ONE MEGOHM/VOLT
METER
Ultraviolet Response Tests Ignition Spark Response Test
Test to be sure that ignition spark is not actuating the flame
relay in the flame safeguard control.
1. Close the pilot and main burner manual shutoff valves.
2. See Table 1 below for Flame Signal. Start the burner and
run through the Ignition period. Ignition spark should
occur, but the flame LED must not light. The flame signal
should not be greater than 0.25 Vdc.
Table 1. Flame Signal.
Minimum
Flame Detector Plug-in Flame Signal Amplifier
C7061M
a
Shutter operation of the C7061M may cause fluctuations in the voltage reading. Read the average stable voltage, disregarding
the peaks.
b
Shutter operates at 12 cycles per minute.
R7861 Dynamic Self-Check
a,b
1.25 5.0
Fig. 8. Measuring voltage flame signal with 7800 Series
a
Acceptable Steady
Voltage (Vdc) Maximum Expected Voltage (Vdc)
controls.
M7382A
3. If the flame relay does pull in, reposition the detector farther from the spark, or relocate/resight the detector to
eliminate/reduce the detector response to reflected UV
radiation. It may be necessary to construct a barrier to
block the ignition spark from the detector view. Continue
adjustments until the flame signal due to ignition spark is
less than the flame signal values indicated in step 2.
Response to other Ultraviolet Radiation Sources
Some sources of artificial light produce small amounts of
ultraviolet radiation. Under certain conditions, an ultraviolet
detector responds as if it is sensing a flame. Do not use an
artificial light source to check the response of an ultraviolet
flame detector. To check for proper detector operation, conduct
flame failure response tests under all operating conditions.
Weld the Sight Pipe
When the flame signal is acceptable after all adjustments are
made, remove the detector and weld the sight pipe in its final
position. (If you are using a swivel mount, the pipe may be
already welded.) Then reinstall the detector.
Final Checkout
Before putting the burner into service, check out the installation
using the Checkout procedures in the Instructions for the
appropriate flame safeguard control. After completing the
Checkout, run the burner through at least one complete cycle
to verify correct operation.
IMPORTANT
Do not put the system into operation until all Checkout
tests in the Instructions for the appropriate flame
safeguard control and any others specified in the
burner installation instructions are satisfactorily
completed.
9 65-0304—05
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
WARNING
WARNING
TROUBLESHOOTING
Electrical shock hazard.
Can cause serious injury or death.
Open the master switch to disconnect power before
removing or installing the detector or its cover. More
than one disconnect may be involved.
UV Sensor Tube Test
See “UV Sensor Tube Test” on page 8.
Inadequate Flame Signal
If a satisfactory flame signal (see Table 1) cannot be obtained
while adjusting the sighting position of the detector, follow
these procedures. If you encounter other problems in the
system, refer to the Troubleshooting section in the instructions
for the appropriate flame safeguard control.
NOTE: For instructions to replace the sensing tube, see
“Service” in next column.
1. Check for the proper line voltage. Make sure the master
switch is closed, connections are correct, and power
supply is of the correct voltage and frequency.
2. Check the detector wiring for defects:
a. Incorrect connections.
b. Wrong type or size of wire.
c. Deteriorated wire.
d. Open circuits.
e. Short circuits.
f. Leakage paths caused by moisture, soot, or dirt.
3. With the burner running, check the temperature at the
detector. If it exceeds 175°F (80°C):
a. use a heat block (part number 136733) or seal off
assembly (part number 105172C).
NOTE: A bushing will be needed as these parts are 3/4-
in. npt.
b. Add additional insulation between the wall of the
combustion chamber and the detector.
c. Add a shield or screen to reflect radiated heat away
from the detector, or
d. Add cooling (refer to Sight Pipe Ventilation).
4. Remove detector from the sight pipe and clean the viewing window with a soft clean cloth.
5. Clean the inside of the sight pipe before re-installing the
flame detector(Fig. 6).
NOTE: Do NOT remove the detector while the equipment
is operating.
NOTE: The detector is free when the collar is unscrewed;
do not drop it.
6. If the flame signal continues to be too low, replace the
plug-in amplifier. Then recheck the flame signal.
7. Replace the ultraviolet sensing tube (see “Service” on
page 10). Then recheck the flame signal.
8. Remove detector from the sight pipe and sight it on a UV
source, and note the flame LED on the 7800 Series
device.
9. If you cannot yet obtain a meter reading, replace the
detector.
IMPORTANT
At the completion of Troubleshooting, be sure to
perform the Adjustments and Checkout procedures.
SERVICE
Electrical shock hazard.
Can cause serious injury or death.
Open the master switch to disconnect power before
removing or installing the detector or its cover. More
than one disconnect can be involved.
Periodic Maintenance
1. Clean the viewing window when necessary. Remove the
detector (see “Troubleshooting” on page 10) and use a
clean cloth over the eraser end of a pencil. Do not
remove the window (or lens) to clean it. If it is broken or
damaged or it is coated with a substance that cannot be
removed, replace the detector.
2. Keep the flame detection system adjusted for the
smoothest, most reliable operation as recommended by
the burner manufacturer.
3. Ultraviolet sensing tubes have a life expectancy of
40,000 hours of continuous use within the ambient temperature and voltage ratings. Replace the sensing tube
at appropriate intervals.
Replacing Ultraviolet Sensing Tube (Fig. 9)
IMPORTANT
Be very careful not to jar the flame detector.
1. Turn OFF the power.
2. Wait at least one minute before loosening the mounting
nut, then remove the C7061M detector from the sight
pipe.
3. Remove the cover by unscrewing the 4 mounting screws.
4. Remove 2 tube unit fixing screws on the rear of the tube
unit and remove the UV sensing tube unit.
NOTE: These screws are NOT captivated. Put them in a
safe place to avoid losing them.
5. Remove UV sensing tube from the tube unit.
6. Carefully remove rubber cover from the old tube and
install onto the new UV tube (Part Number 129464N).
7. Slide new tube into tube unit holder.
8. Insert the top part of the new tube unit into the round
hole in the upper portion of the shutter unit and push the
bottom part of the tube unit down into place.
65-0304—05 10
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
M29136A
MOUNTING
NUT
CABLE
GUIDE
FLANGE
UNIT
TUBE
UNIT
COVER
MOUNTING
SCREWS (4)
TUBE UNIT
FIXING SCREW
Operation check
1. Mount the C7061M on the monitoring pipe
2. Turn on the power.
3. Start the combustion of the burner.
4. Measure the flame voltage at the Flame Amplifier.
Table 2.
Fig. 9. Replacing ultraviolet radiation sensing tube.
9. Tighten 2 tube unit fixing screws removed during Step 4.
10. Make sure that the O-ring is not disengaged from the
flange unit.
11. Secure the cover with 4 cover mounting screws.
NOTES:
1. After replacing the ultraviolet sensing tube, be sure
to carefully mount the O-ring on the flange unit
before reattaching the cover. Otherwise the UV
sensor will not be properly sealed.
2. Tighten the terminal screws and mounting screws
with a tightening torque of 6 in.-lbs.
Recommended flame
voltage
Stable 1.25Vdc or more.
• The flame is monitored
Inspection
item
correctly.
(The flame voltage may
fluctuate with the shutter
operation of this unit.)
• The light-receiving lens
of this unit is not dirty.
• No soot or other foreign
matter has accumulated
in the monitoring pipe.
NOTE: If the flame voltage exceeds 4.5Vdc, limit the
quantity of ultraviolet rays with an orifice ring or
the like. If there is too much ultraviolet radiation, it
can penetrate the tube unit even when the shutter
is closed, causing faulty operation.
Inspection and Adjustment
After replacing the UV sensing tube, perform a pilot turndown
test, an ignition spark response test and a safety shutoff test to
verify proper functioning of the tube unit.
IMPORTANT
Do not put the system into operation until all Checkout tests in
the Instructions for the appropriate flame safeguard control and
any others specified in the burner installation instructions are
satisfactorily completed.
11 65-0304—05
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
® U.S. Registered Trademark
© 2013 Honeywell International Inc.
65-0304—05 M.S. Rev. 07-13
Printed in United States
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