21
®
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 UV1A, UV2 scanner within 30 inches of the flame to be monitored; the 45UV5
within 72 inches, closer if possible.
2.
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 #35-69 for UV1A, UV2 Scanners,
#35-127-1 for 45UV5) to reduce conducted heat.
3.
The UVlA, UV2, 45UV5 Scanners are designed to seal off the sight pipe up to 1 PSI pressure.
Higher furnace pressures should be sealed off. To seal off positive furnace pressure up to 100
PSI for UV1A, UV2 Scanners, install a quartz window coupling (#60-1257) For 45UV5 Scan-
ners, use #60-1100 coupling. Add cooling air to reduce the scanner sight pipe temperature.
4.
Install the scanner on a standard NPT pipe (UV1A: 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 (#60-302 for UV1A, UV2 Scan-
ners, #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
.
CAUTION: The UV1A, UV2, UV8A, UV90 and 45UV3 flame scanners and associated
amplifier module are non-self checking UV systems and should be applied only to burners
that cycle often (e.g.: a minimum of once per 12 hours) in order for the safety checking cir-
cuit to be exercised. If component checking is required during burner operation for con-
stantly fired burners, utilize the self-checking ultra-violet flame scanners (45UV5, 55UV5)
with associated amplifier modules (YB110UVSC), or the infrared flame scanner (48PT2)
with associated Auto Check amplifier (YB110IR).
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
