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C7961E,F Dynamic Self-Check
Ultraviolet Flame Detector
C7961F
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.
C7961E
• 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.
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).
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Wiring (Fig. 10) .................................................................
Adjustments and Checkout ...............................................
Troubleshooting ................................................................
Service ............................................................................. 10
PRODUCT DATA
Contents
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65-0267-09
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Related Manuals for Honeywell C7961E
Summary of Contents for Honeywell C7961E
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Page 1: Table Of Contents
• High pressure 50 psi (345 kPa) quartz viewing window, C7961F 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 C7961F: •... -
Page 2: Specifications
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... -
Page 3: Installation
M24000B 1. Do not connect these detectors to non-Honeywell manufactured controls (primaries, programmers, mul- Fig. 1. Dimensions of C7961E in inches. (mm). tiburner systems, and burner management systems). Unsafe conditions could result. 2. All wiring must be NEC Class 1 (line voltage). - Page 4 C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR Temperature Except under unusual circumstances, none of these sources except hot refractory and ignition spark would be present in or Install the C7961 where the ambient temperature (outside the near the combustion chamber. case) stays within the ambient operating temperature ratings.
- Page 5 C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR In most installations, the detector needs to respond to the pilot If you reposition a detector and still cannot achieve flame flame alone, then the pilot and main burner flame together, and discrimination, try reducing the viewing area by increasing the finally the main burner flame alone.
- Page 6 C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR Mount Sight Pipe sighting downward or upward, as illustrated in Fig. 6. The C7961 has notch and arrow indicators (see Fig. 7) on the Thread one end of the pipe to fit the mounting flange, union, or faceplate to facilitate mounting in positions other than those required coupling.
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Page 7: Wiring (Fig. 10)
167°F (75°C). Fig. 8. Mounting C7961E Detector. 6. For high temperature installations, use Honeywell speci- fication No. R1298020 wire or equivalent for the F lead- wire. This wire is rated up to 400°F (204°C) for continuous duty. -
Page 8: Adjustments And Checkout
NOTE C7961 TERMINAL 4 IS CONNECTED TO ELECTRICAL GROUND. METER METER LEAD M34216A Fig. 10. Wiring diagram for C7961E,F Detectors with 7800 Series Flame Safeguard controls. 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. -
Page 9: Troubleshooting
C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR Table 1. Flame Signal. Minimum Plug-in Flame Acceptable Steady Maximum Expected Flame Detector Signal Amplifier Flame Safeguard Control(s) Voltage (Vdc) Voltage (Vdc) C7961E,F R7851C Dynamic 7800 Series or R7140 1.25 Self-Check Shutter operation of the C7961 may cause fluctuations in the voltage reading. Read the average stable voltage, disregarding the peaks. -
Page 10: Service
C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR Removing Detector from Sight Pipe (Refer to Fig. 8) FACEPLATE PENCIL 114372 (20 PSI) OR 122748 (50 PSI) Loosen the three screws holding the mounting flange; rotate QUARTZ VIEWING WINDOW (OR 124204 QUARTZ FOCUSING LENS, 20 PSI) the detector slightly so the screws clear the slots in the back section of the flange;... - Page 11 C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR NOTE: Make sure the red rubber washer between the 8. Put the seal-off flange back into place on the faceplate gray fiber-neoprene gasket and the back section and securely tighten the four hex-head bolts.
- Page 12 C7961E,F DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North ® U.S. Registered Trademark Golden Valley, MN 55422 © 2013 Honeywell International Inc. 65-0267-09 JPG Rev. 01-13 customer.honeywell.com Printed in United States...