"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

Catalog Combustion 2021 - Page 0894

Fives Group
FIVES GROUP
FIVES GROUP-FIVES GROUP-0894-0898

Request Quote

Please provide additional information
Company: *
Name: *
Email: *
Telephone:
Product:
Message:


Privacy Policy and Terms of Service apply.

Fives Group Part Numbers on this Catalog Page
Line Part Number Manufacturer Request Quote
1 916-2211 Fives Group Request Quote
2 4-7628-1 Fives Group Request Quote
3 4-8035-2 Fives Group Request Quote
4 776-1431 Fives Group Request Quote
5 4-9770-2 Fives Group Request Quote
6 7035-1080 Fives Group Request Quote
7 4-7629-1 Fives Group Request Quote
8 4-7932-1 Fives Group Request Quote