Emerson Process Management NGA2000 HFID 用户手册

748297-E 
June 2003 

4-6     Maintenance and Troubleshooting 

Rosemount Analytical Inc.    A Division of Emerson Process Management  

Model NGA2000 HFID

The components shown can be replaced without removing burner/thermal block from oven.  Oven not shown for clarity.
Thermal block shown in phantom for clarity. 

Set Screw  
M3X0.5 x 10mm 
903125 

RTD Detector 
657063 

Ignitor Assembly 
657205 

O-Ring 
903736 

O-Ring 
903737

 

Flameout Sensor 
657199 

Temperature Sensor 
657468 

Retainer, Burner Cap 

Burner Cap 

1.  Refer to Figure 4-4A on page 4-5.  

Remove the four screws on the oven 
cover, remove cover. 

2.  Refer to Figure 4-5 below.  Discon-

nect the ignitor wiring connector, note 
location. 

3.  Using an open-end wrench, unscrew 

the ignitor assembly from the burner.  
Verify that o-ring is also removed. 

4.  Install replacement ignitor and new o-

ring.  Using open-end wrench, snug 
down.  Do not over-tighten!  

5.  Re-attach wiring connector.  

6.  Install oven cover 

 

1.  Refer to Figure 4-4A on page 4-5.  

Remove the four screws on the oven 
cover, remove cover. 

2.  Refer to Figure 4-5 below.  Discon-

nect the flameout detector wiring con-
nector, note location. 

3.  Lift up the burner cap until flameout 

sensor is accessible.  Using an open-
end wrench, unscrew the flameout 
detector from the burner.  Verify that 
o-ring is also removed. 

4.  Install replacement flameout detector 

and new o-ring.  Using open-end 
wrench, snug down.  Do not over-
tighten!  

5.  Re-attach wiring connector.  

6.  Install oven cover.