13
®
FLAME SCANNERS
INSTALLATION - UV SCANNERS
Where possible, obtain the burner manufacturer’s instructions for mounting the scanner. This infor-
mation is available for most standard burners. The scanner mounting should comply with the follow-
ing general instructions:
1.
Position the UV1AL, UV90L or UV5 scanner within 39 inches (1 meter) of the flame to be
monitored. Consult SC-108 bulletin for more information.
2.
Select a scanner location that remains within the ambient temperature limits of the UV Scanner.
3.
The UVlAL scanner is designed to seal off the sight pipe up to 1 PSI pressure. Higher furnace
pressures must be sealed off. To seal off positive furnace pressure up to 50 PSI for the UV1AL
scanner, install a quartz window coupling (#60-1257). Add cooling air to reduce the scanner
sight pipe temperature.
4.
Install the scanner on a standard NPT pipe (UV1AL: 1/2”) whose position is rigidly fixed. If the
scanner mounting pipe sights through the refractory, do not extend it more than halfway
through. Swivel flanges are available if desired (P/N: 60-302). The sight pipe must permit an
unobstructed view of the pilot and/or main flame, and both pilot and main flames must com-
pletely cover the scanner field of view.
5.
Smoke or unburned combustion gases absorb ultra-violet energy. On installations with negative
pressure combustion chambers, a small hole drilled in the UV1AL sight pipe assists in keeping
the pipe clean and free from smoke. For positive pressure furnaces, provide clean air to pressur-
ize the sight pipe, if necessary.
6.
Two UV Scanners may be installed on the burner if it is necessary to view two areas to obtain
reliable detection of the flame. They must be wired in parallel.
7.
To increase scanner sensitivity with UV1AL scanner, a quartz lens permits location of the scan-
ner at twice the normal distance. Use 1/2” x 1 1/2” pipe nipple between UV1AL scanner and the
coupling.
8.
Request the assistance of any Fireye field office for recommendations of a proper scanner instal-
lation on a non-standard application.
UV90L
UV1AL
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
