Datasheet Content
[{"filename":"SC-107-Flame_Scanners_UV7A4_UV7R4_UV7SC_English_2018-02-02.pdf","text":"®\n\n SC-107\n FEBRUARY 2, 2018\n UV7A4\n ®\n Fireye\n FLAME SCANNERS\n UV Non Self-Checking Scanner Models:\n 3G-OTH-02858 UV7A4, UV7R4\n UV Self-Check Scanner Model:\n UV7R4\n 3G-OTH-02858\n\nDESCRIPTION\n The non self-check UV7A4, UV7R4 and self-check 3G-OTH-02858 scanners are used with the\n MBSERIES Multi-Burner control, the SBSERIES single burner control and the flame sensing\n modules, MBPF-100S and MB-600PF.\n The UV7A4 scanner features high sensitivity ultraviolet (UV) for monitoring gas or oil flames\n which cycle on and off frequently. The Fireye flame safeguard checks for a short-circuited, or \"run-\n away\" scanner at the beginning and end of each flame cycle. The scanner is UL listed and FM\n approved. It comes with a 122 cm (4 ft.) shielded flexible cable and a 1/2\" F.N.P.T. insulated nylon\n coupling and is ideal for high temperature applications.\n The UV7R4 Scanner is a 90° right angle ultraviolet flame scanner. This sensor features high sensi-\n tivity ultraviolet (UV) for monitoring gas or oil flames which cycle on and off frequently. The Fireye\n flame safeguard checks for a short-circuited, or \"runaway\" scanner at the beginning and end of each\n flame cycle. The scanner is UL listed and FM approved. It comes with 72 inch (1830mm) unshielded\n lead wires and is safeguarded against reverse connection.\n The self-check 3G-OTH-02858 scanner is used for continuous gas or oil flames. A mechanical shutter in the\n scanner closes every ten seconds, at which time the scanner’s internal circuit checks for a flame sig-\n nal. If a signal is present, indicating a runaway scanner, the output signal is permanently interrupted,\n shutting down the flame safeguard system. The scanner features a high quality fused silica quartz\n lens, machined alloy housing with seals and a long life push-pull electro-magnetically driven photo\n shutter. The detectors and signal processor automatically check every 10 seconds. It can be replaced\n without disturbing wiring. The 3G-OTH-02858 requires cable assembly, P/N 59-504-010.\n The UV tube is made of quartz and is filled with a gas that ionizes when struck by UV radiation from\n the flame. In the absence of UV radiation, the gas acts as an insulator between two electrodes which\n are mounted inside the tube. These electrodes are energized continuously by a high voltage. During\n combustion, UV radiation ionizes the gas, causing current pulses to flow between the electrodes.\n These current pulses result in a flame signal which is transmitted to the amplifier in the control,\n where it is processed to energize or hold in the flame relay.\n\n\n WARNING: When installing or replacing UV scanners, a minimum pilot turndown test on\n pilot ignited burners and a spark pickup test on all burners must be performed.\n\n\nAPPLICATION\n UV scanners are recommended for detecting flames from standard fuel gases, some waste gases and\n light oil fuels such as No. 2 oil. Flames from heavier oils can be detected with UV scanners but the\n unburned fuel shroud and/or atomization shroud can block passage of the UV from the flame zone to\n the UV tube, causing nuisance burner/boiler trips. Infrared detection is recommended for fuel oil\n heavier than No. 2, and some installations where waste gases are burned together with natural gas as\n a main flame.\n NOTE: Certain safety codes and regulations require the use of self-checking ultraviolet scanners.\n\n 1\n\f \n\n\n\n\nSPECIFICATIONS\nUV7A4\n Supply 425 VDC ±25 VDC\n Discharge Current 0.3 mA\n Supply Wiring 122 cm (4 ft.) shielded instrument cable with two #18 AWG conductors\n Max Operating Distance 76m (250 ft.)\n (Total Wire Length)\n Temperature Range –20° to +125°C (–4° to 257°F)\n Shipping Weight 1.4 kilograms (3 lbs.)\n Options Magnifying lens (P/N 46-185)\n\n\nUV7R4\n Supply Voltage 425 VDC ±25 VDC\n Discharge Current 0.1 mA\n Supply Wiring 305 cm (10 ft.) cable lead of two #18 AWG conductors\n Max Operating Distance 76m (250 ft.)\n (Total Wire Length)\n Temperature Range –20° to +60°C (-4° to 140°F)\n Shipping Weight 1.4 kilograms (3 lbs.)\n Options Magnifying lens (P/N 46-185), 1/2\" F.N.P.T. insulated coupling\n (P/N 35-319) or radiation shield (P/N 36-936)\n\n\nUV7SC\n Electrical: Supply Voltage: 120V +10/-15%, 60HZ\n Supply Current: 0.04A\n Output: 10V square wave frequency modulated\n Mechanical: Overall Length: 197 mm (7-3/4\")\n Diameter: 83 mm (3-1/4\")\n Housing Material: Machined 6061 aluminum alloy\n Finish: Clear anodized\n Sight Tube Entrance: 25 mm (1\") pipe thread\n Purge Air Entrance: 10 mm (3/8\") pipe thread\n Purge Air Flow: 5 cfm, 10 psi maximum\n Installation\n Requirements: Cable and connector for scanner (P/N 59-504-010)\n Supply Wiring Instrumentation cable with two pairs of individually shielded #18 AWG\n conductors, 60°C (140°F), 300V minimum, ALPHA #5620B1802 or\n BELDEN #9368\n Temperature Range –20° to +60°C (-4° to 140°F) case temperature\n Shipping Weight 2 kilograms (4.5 lbs.)\n Optical Angle of View: @ 2.5° depending on sight pipe size and length\n Spectral Sensitivity: 180 to 230 nanometers; scanner is solar blind\n\n\n 2\n\f ®\n\n\n\n\n IMPORTANT NOTE\n The information provided in this bulletin is directed to assist boiler and combustion service techni-\n cians who are experienced in the installation and operation of Fireye Flame Safety equipment. Per-\n sons not familiar with Fireye products should contact the nearest Fireye representative or other\n qualified service group.\n The UV7A4, UV7R4, and 3G-OTH-02858 as well as all other Fireye scanners, are designed to be used\n exclusively with the appropriate Fireye Flame safeguard and Burner Management controls. The\n application of these scanners to equipment other than Fireye should be reviewed for approval by\n Fireye.\n\n\nINSTALLATION OF UV SCANNERS\n\n WARNING: THE LEADS FROM THE UV7R4 SCANNER TO THE\n CONTROL MUST BE SHIELDED TO PREVENT ELECTRICAL NOISE FROM GEN-\n ERATING A FALSE FLAME SIGNAL TO THE CONTROL.\n Where possible, obtain the Burner Manufacturer’s Instructions for mounting the scanner.\n This information is available for most standard burners. The scanner mounting should\n comply with the following General Instructions:\n\n 1. The quartz UV tube is brittle. Care must be exercised to avoid dropping or otherwise striking the\n scanner with force. Keep the scanner protected until mounted.\n 2. Position the UV scanner within 36 inches of the flame to be monitored.\n 3. Select a scanner location that will remain within the ambient temperature limits of the UV Scan-\n ner (200°F). If cooling is required, use an insulating coupling (Fireye P/N 35-319).\n 4. The UV Scanners are designed to seal off against pressures up to 1 PSI. To seal against higher\n pressures, install a union coupling with quartz window (P/N 60-1257). Add cooling air to reduce\n the scanner sight pipe temperature.\n 5. Install the scanner on a standard 1/2 in. NPS (1 in. NPT for 3G-OTH-02858) pipe whose position is rig-\n idly fixed. If the scanner mounting pipe sights through the refractory, do not extend it more than\n halfway through. Swivel flanges are available if desired (P/N 60-302). The sight pipe must per-\n mit an unobstructed view of the pilot and/or main flame, and both pilot and main flames must\n completely cover the scanner field of view. Oil and gas flames radiate more ultraviolet energy\n from the base of the flame than from further out in the flame. This fact should be considered\n when installing the scanner sight pipe.\n SCANNER MUST HAVE UNOBSTRUCTED FLAME MUST COMPLETELY COVER\n VIEW OF FLAME SIGHT OPENING\n\n\n\n\n NOT THIS NOT THIS BUT THIS NOT THIS NOT THIS BUT THIS\n 6. Since the radiated energy from an electric spark ignitor is very rich in the UV region, the field of\n view should be aimed so that it does not see an electric spark ignitor nor any reflector that is\n close to the spark.\n\n\n CAUTI0N: The unprotected leads must be run in electrical conduit in order to eliminate\n pickup of electrical noise which could present an unsafe condition.\n\n\n To prevent spark pickup by the UV detector, close and/or disconnect all pilot and main fuel\n valves. Operate the control through a burner startup cycle to determine that ignition spark can-\n not be detected. Burner will not ignite if spark is detected.\n 7. Avoid running the scanner cables or conduit in close proximity to hot surfaces at the burner.\n 8. Avoid running the…
