Fireye D30 Series Manual Download Page 7

Page: 7 / 24

INSTALLATION - UV SCANNERS

Where possible, obtain the Burner Manufacturer’s Instructions for mounting the scanner. This infor-
mation is available for most standard burners manufactured. The scanner mounting should comply
with the instructions that follow.

Position the UV1, UV2, UV8A scanner within 36 inches of the flame to be monitored, the
45UV5 within 72 inches, closer if possible.

Select a scanner location that will remain within the ambient temperature limits of the UV scan-
ner. If cooling is required, use an insulating coupling (Fireye P/N 35-69 for UV1, UV2, UV8A
scanners, P/N 35-127-1 for 45UV5) to reduce conducted heat.

The UV1, UV2, UV8A, 45UV5 scanners are designed to seal off the sight pipe up to 1 PSI pres-
sure. Higher furnace pressures should be sealed off. To seal off positive furnace pressure up to
100PSI for UV1, UV2, UV8A scanners, install a quartz window coupling (P/N 60-1257). For
45UV5 scanners, use P/N 60-1199 coupling. Add cooling air to reduce the scanner sight pipe
temperature.

Install the scanner on a standard NPT pipe (UV1 and UV8A - 1/2", UV2-3/8", 45UV5-1")
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 for
UV1, UV2, UV8A scanners, P/N 60-1664-3 for 45UV5). The sight pipe must permit an unob-
structed view of the pilot and/or main flame, and both pilot and main flames must completely
cover the scanner field of view.

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.

Smoke or unburned combustion gases absorb ultraviolet radiation. On installations having nega-
tive pressure combustion chambers, a small hole drilled in the UV1, UV2 and UV8A 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 pres-
surize the sight pipe, if necessary.

Two UV1, UV2 and UV8A scanners may be installed on one 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 45UV5-1009 scanner may be installed on a burner.

To increase the scanner sensitivity with UV1, UV2 and UV8A scanners, a union with quartz lens
(P/N 60-1290) permits location of the scanner at twice the normal distance. Use 1/2" x 3/8"
bushing on UV2 installations. Install a 1/2" x 1 1/2" nipple between the scanner and the union.

Request the assistance of any Fireye field office for recommendations on proper scanner installation
for a non-standard application

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.

BUT THIS

NOT THIS

FLAME MUST COMPLETELY COVER

SIGHT OPENING

SCANNER MUST HAVE UNOBSTRUCTED

VIEW OF FLAME

NOT THIS

BUT THIS