Emerson Process Management NGA2000 HFID 用户手册

748297-E 
June 2003 

4-28     Maintenance and Troubleshooting 

Rosemount Analytical Inc.    A Division of Emerson Process Management  

Model NGA2000 HFID

1.  Disconnect wiring solenoid valve wir-

ing connector, note location. 

2.  Inside the analyzer module, discon-

nect the tube going to the connector 
on the “out” port of the solenoid valve. 

3.  On the rear of the analyzer module at 

the fuel in port: 

a. 

Disconnect the fuel in tube. 

b. 

Remove nuts and washers. 

4.  Remove solenoid valve from analyzer 

module 

5.  Remove the fittings from the solenoid 

valve and replace the Teflon pipe 
thread tape. 

6.  Verify that body of replacement sole-

noid valve is oriented as shown in 
Figure 4-22 on page 4-27.  If not, ro-
tate till wires are in-line with “out” port. 

7.  Install fittings into replacement sole-

noid valve, re-install in analyzer mod-
ule. 

1.  Leaving the bulkhead fitting secured 

to the rear panel, remove the tubes, 
nuts and ferrules from the fitting. 

2.  Insert a clean, rigid piece of tube or 

rod (smaller than .25 inch diameter) 
into the bulkhead fitting to force out 
the filter disc. 

3.  Install the replacement filter in the 

same manner, through the rear of the 
bulkhead fitting. 

4. Re-connect 

tubes. 

 

 

1.  On the outside of the rear panel, dis-

connect tube and remove nut. 

2.  Insert a small spade screwdriver into 

the bulkhead and remove the restric-
tor. 

3.  Install in reverse order. 

1.  Disconnect tube at elbow. 

2.  Remove check valve from female 

connector. 

3.  Remove elbow from check valve. 

4.  Add Teflon pipe thread tape to check 

valve threads. 

5.  Install elbow onto check valve. 

6.  Install check valve into female con-

nector, verifying orientation of elbow 
fitting as shown in Figure 4-22 on 
page 4-27.