46
#60-1664-3 for 45UV5). The sight pipe must permit an unobstructed view of the pilot and/or
main flame, and both pilot and main flames must completely cover the scanner field of view.
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. For positive pressure furnaces, provide clean air to
pressurize the sight pipe, if necessary.
6.
Two UV1 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.
To increase scanner sensitivity with UV1, UV2 Scanners, a quartz lens permits location of the scan-
ner at twice the normal distance. Use 1/2” x 1 1/2” pipe nipple between UV1 Scanner and the cou-
pling. Use 3/8” pipe nipple and a 1/2” x 3/8” bushing on UV2 installations.
7.
Request the assistance of any Fireye field office for recommendations of a proper scanner instal-
lation on a non-standard application.
TYPICAL SCANNER INSTALLATIONS
SCANNER MUST HAVE UNOBSTRUCTED
VIEW OF FLAME
NOT THIS
NOT THIS
BUT THIS
FLAME MUST COMPLETELY COVER
SIGHT OPENING
NOT THIS
NOT THIS
BUT THIS
The maximum UV sig-
nal from a flame is
found in the first one-
third of the visible
flame taken from the
point where the flame
begins. The scanner
sight pipe should be
aimed at this area.
DO NOT EXTEND
MORE THAN
HALF-WAY INTO
REFRACTORY
SCANNER
FORCED
CLEAN AIR
(FROM DISCHARGE
OF FAN)
METHODS OF COOLING SCANNER
INSULATING
TUBING
SEALING
UNION
FORCED
AIR
EXTEND SIGHTING TUBE
6”(1524) OR 8”(2032)
DO NOT EXTEND MORE THAN
HALF-WAY INTO REFRACTORY
