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INSTALLATION - UV  SCANNERS
WIRING - UV SCANNERS

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 FLAME SAFEGUARD Note: Since oil and gas flames radiate more ultraviolet energy from the base of the flame than from further out in the flame this fact should be taken into consideration when installing the scanner sight pipe. CAUTION:  The scanner must not sight the ignition spark directly,  or  any  part  of  the  burner  that can reflect the spark back to the scanner.  The scanner must not see a pilot flame that is too small to reliably ignite the main flame. 5. Smoke  or  unburned  combustion  gases  absorb  ultraviolet  energy.    On  installations  with  negative pressure combustion chambers, a small hole drilled in the UV 1, UV2 sight pipe will assist in keeping the pipe clean and free from smoke.  The 45UV5 has a 3/8” plug in the mounting flange that can be removed.  For positive pressure furnaces, provide clean air to pressurize the sight pipe, if necessary. 6.    Two UV  or UV2 Scanners may be installed on the burner if it is necessary to view two areas to obtain reliable detection of the flame.  They should be wired in parallel.  Only one repetitive self- checking 45UV5 Scanner may be installed on a burner. 7.    To increase scanner sensitivity with UV1, UV2 Scanners, a quartz lens permits location of the scanner at twice the normal distance.  Use 1/2" x 1 1/2" pipe nipple between UV 1 Scanner and the coupling. Use 3/8" pipe nipple and a 1/2" x 3/8" bushing on UV2 installations. 8.    Request the assistance of any Fireye field office for recommendations of a proper scanner installation on a non-standard application. Typical Scanner Installations page 3 - 1058







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