23
®
SCANNER INSTALLATION
Infrared scanner installation
A single scanner is used to detect both pilot and main flames. In order for this to happen, the sight
pipe on which the scanner mounts must be aimed so that the scanner sights a point at the intersection
of main and pilot flames. flames. The scanner must have an unobstructed view of the flame being
monitored. To avoid nuisance shutdowns, it is important to avoid sighting hot refractory.
The figure above shows installation instructions for the 48PT2 scanner in various circumstances, tak-
ing into account the maximum scanner temperature rating of 52 °C.
•
Standard mounting
•
Mounting with cooling and/or purging air
•
Mounting with heat insulating nipple
•
Mounting in case of excessive furnace or windbox pressure
Note: 1/2” nipples and l/2” TEE pieces are not available from Fireye; these must be purchased
locally.
Ultra-violet scanner installation
•
Locate the scanner as close as possible to the flame.
•
The scanner must not sight the spark directly or any part of the burner that can reflect the spark
back to the scanner.
•
The maximum UV signal 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.
•
On installations having negative pressure combustion chambers, a small hole
(
1
/
8
”or
3
/
16
”) drilled in the sight pipe will help to keep the pipe clean and free from smoke. Two
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.
NOTE: Two 45UV5 Type scanners cannot be wired in parallel.
AND COOLING)
AIR ENTRY (PURGE
1/2'' NIPPLE
UNION COUPLING
MOUNTING FOR EXCESSIVE FURNACE
OR WINDBOX PRESSURE WITH
PURGING COOLING AIR
1/2'' SWIVEL MOUNT
STANDARD MOUNTING WITH
PURGING/COOLING AIR
1/2'' NIPPLE
#60-302
1/2'' NIPPLE
1/2'' NIPPLE
#60-1257 WITH QUARTZ WINDOW
#60-1290 WITH QUARTZ LENS
1/2'' NIPPLE
AND COOLING)
AIR ENTRY (PURGE
STANDARD MOUNTING
1/2'' NIPPLE
1/2'' – IR SCANNER
TYPE 48PT2
BURNER FRONT PLATE
1/2'' SWIVEL MOUNT
1/2'' SWIVEL MOUNT
#60-302
#60-302
1/2'' SWIVEL MOUNT
#60-302
1/2'' NIPPLE
HEAT INSULATOR
#35-69
ALTERNATE STANDARD MOUNTING
(NOT ADJUSTABLE)
1/2'' SIGHT PIPE
Ø50
1/2– IR SCANNER
TYPE 48PT2
MOUNTING 48PT2 SCANNERS
Ø50
Ø50
Ø50
Ø15
MOUNTING WITH HEAT INSULATING NIPPLE