"R" ADAPTERS for FLAME DETECTORS
ADAPTERS and DETECTORS
All Series R adapters have the following parts in common:
Cooling Air Connector
R916-2211
Sealing
Window
4-7628-1
Gasket (2 reqd)
4-7629-1
Body
4-9770-2
¾
" Mtg. Adapter
4-7932-1
#8-32
Setscrew
R776-1431-N
Flame detector adapters are available for specifi c fl ame
detectors. Adapters have a sealing window and a ¼” tube (
1⁄8
”
NPT) connector for cooling or purging air.
The most common confi guration is to use purge air, where
approximately 2 to 3 cfm of air is used to keep the fi re side of
the quartz sealing lens clean as well as to provide cooling to the
UV scanner and adapter assembly. In the purge air confi guration,
the fl ame detector is isolated from the purging air and burner
environment/combustion chamber by the quartz sealing lens.
When using the purging confi guration on a burner developing
backpressure and/or fi ring into a positive combustion chamber,
use suffi
cient air pressure to assure positive purge air fl ow
through the adapter. Purge air fl ow can infl uence the lighting
characteristics of certain burners and/or limit their performance
range at reduced fi ring rate. Care must be taken to adjust
the purge air fl ow for adequate purge and cooling without
introducing an undesirable limitation in burner ignition reliability
or performance.
Bulletin 8832
Page 6
8835-R
3½ " long
Shown with PC11 UV Scanner
8831-R
3⁄8
" MNPT
¾
" MNPT
8833-R
1" MNPT
1" MNPT
8834-R
¾
" FNPT
¾
" MNPT
8835-R
¾
" MNPT
¾
" MNPT
8836-R
½
" MNPSM
¾
" MNPT
8837-R
1"
MNPSM
¾
" MNPT
8839-R
1"
MNPT
¾
" MNPT
Adapter
Detector
Connection Size
Burner
Connection Size
The alternate confi guration is to use cooling air, where
approximately 1 cfm of air (at 8 osig pressure) is used to cool
the adapter as it passes through the space between the quartz
sealing lens and the fl ame detector. This confi guration is only
used when no purge air fl ow can be tolerated by the burner.
“R” Adapters are shipped with a setscrew plugging the hole that
vents cooling air. Leave the setscrew in place for purging air.
Remove the setscrew if cooling air is employed and mount the
detector on the tube side of the adapter, opposite of the sealing
window.
Adapters have a ¾” NPT thread to fi t the ¾” NPT fl ame detector
mounting provision of most North American burners. The basic
8835-R unit is common to all “R” adapters. It has a ¾” NPT on
both ends. Other adapters are made from the 8835-R by adding
the appropriate fi tting to one end. The 8835-R adapter is also
available with 1” NPT connection as 8833-R. All "R" adapters are
rated for up to 10 psig backpressure.
1
¾
"
Sealing
Window
Gaskets
Setscrew
8837-R
6¼ " long
Shown with C7035A-1080 UV Scanner
1
¾
"
Sealing
Window
4-8035-2
Adapter
Gaskets
Setscrew
Configuration | Flame Detectors and Adapters
