4
FLAME SCANNERS
INSTALLATION - UV SCANNERS
Where possible, obtain the burner manufacturer’s instructions for mounting the UV scanner. This
information is available for most standard burners. The UV scanner mounting must comply with the
following general instructions:
1.
Position the UV1AL, UV5, or UV90L scanner within 30 inches of the flame to be monitored.
2.
Select a scanner location that remains within the ambient temperature limits of the UV Scanner.
If cooling is required, use an insulating coupling (Fireye #35-69 for UV1AL to reduce con-
ducted heat).
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 100 PSI for 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) whose position is rigidly fixed. If the scan-
ner mounting pipe sights through the refractory, do not extend it more than halfway through.
Swivel flanges are available if desired (#60-302 for UV1AL) . The sight pipe must permit an
unobstructed view of the pilot and/or main flame. Both pilot and main flames must completely
cover the scanner field of view
FIGURE 1.
AIMING YOUR SCANNER.
5.
Smoke or unburned combustion gases absorb ultraviolet energy. On installations with negative
pressure combustion chambers, a small hole drilled in the UV1AL sight pipe keeps the pipe
clean and free from smoke. For positive pressure furnaces, provide clean air to pressurize the
sight pipe, if necessary.
6.
To increase scanner sensitivity with UV1AL, use a union with quartz lens (Fireye #60-1290).
This should facilitate the location of the scanner at twice the normal distance. Use l/2" x 1 l/2"
pipe nipple between UV1AL Scanner and the coupling.
7.
Request the assistance of any Fireye field office for recommendations of a proper scanner instal-
lation on a non-standard application.
UV90L-1
UV1AL
UV5-1
CAUTION: The UV90L-1, UV1AL, and UV5-1 flame scanners are non-self checking UV
sensors. Use these only on burners that cycle often (e.g.: a minimum of once every 24 hours)
in order for the external safety checking circuit to be exercised.
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
