How to Disassemble and Assemble the HES (High Efficiency Source)

Answer

This Information Applies To: Agilent HES source, Agilent 5977 Series GC/MSD

Issue:

During normal operation of the GC/MSD, the ion source will need to be disassembled to proceed with abrasive ion source cleaning and / or replacement of consumable parts (dual filament assembly and ceramic insulators). The ion source will then need to be assembled prior to re-installing. Proper abrasive cleaning, assembly, and installation are essential to robust and reliable operation.

Tools Needed:

• Gloves, clean, lint-free
• Cloths, clean 
• T6 Torx driver
• Tweezers
   
  

  

  Figure 1.  Pars of the HES Source

• Item Number	Item Description	Part Number
  1	Source finger grip	G7002-20008
  2	Filament block	G7002-20019
  3	Extractor lens (5)*, with 3 mm opening	G7004-20061
  4	Ceramic insulator for extractor	G7002-20064
  5	Entrance lens assembly, Extended, HES (1)*	G7004-20065
  6	Ion focus lens (2)*	G7004-20068
  7	Lens insulator/holder	G7002-20074
  8	M2 x 0.4 screw x 12 mm long gold plated screw	G7002-20083
  9	Source body	G7002-20084
  10	Post extractor lens 2 (3)*	G7004-20090
  11	Post extractor lens 1 (4)*	G7004-20004
  12	M2 x 6 mm gold plated screw	G7002-20109
  13	Locking ring lens insulator	G7002-20126
  14	High efficiency dual filament	G7002-60001
  15	Ring heater/sensor assembly	G7002-60058
  16	Source mount 1.5 mm	G7002-60053
  17	Repeller assembly	G7002-67057

  * The number in parenthesis is the number engraved on the lens

  
  
  

To Disassemble the HES source:

1. Remove the ion source and place it on a clean cloth
2. Use a T6 Torx screwdriver to remove the two screws securing the source mount to the source body. (See Figure 2 for steps 2-8)
3. Use the finger grip to remove the source mount from the lens body.
4. Use a T6 Torx screwdriver to remove the screw securing the filament block to the source mount and using the finger grip, remove the filament block.
5. Remove the dual filament from the filament block.
6. Remove the finger grip from the filament block.

   Caution: Use care when removing the filament from the filament block. Putting excessive stress on the filament can break or crack it. If this happens, do not attempt to operate with a defective filament, it must be replaced.

7. Remove the repeller and ring heater/sensor assembly from the source body.
8. Separate the repeller from the ring heater assembly.
   

   Caution: Use care when removing and handling the ring heater/sensor assembly. Putting excessive stress or pressure on this assembly can break or crack it. If this happens, do not attempt to operate with a damaged ring heater/sensor assembly, it must be replaced.

   
   

   
   
   Figure 2.  Disassembling the source to remove the source mount, filament block, filament, repeller and ring heater sensor assembly from the source body.
   
   

9. Use a T6 Torx screwdriver to remove the screw and locking ring for the lens insulator that secures the lens stack in the source body, then remove the lens stack. (see Figure 3 for steps 9-10)
   1. If necessary, use gravity to remove the lens stack ceramic insulator from the source body.
10. Remove the five lenses from the lens insulator/holder.
    
    

    Caution: Use care when removing the lenses from the lens insulator casing. Putting excessive stress on this casing can break or crack it. If this happens, do not attempt to operate with a defective lens insulator, it must be replaced.

    
    
    
    Figure 3. Removing the lens and lens stack from the source body. 
    
    

11. For source cleaning instructions see How to Clean the HES (High Efficiency Source

To Assemble the HES Source:

1. Assemble the five lenses inside the lens insulator. The lens number is engraved into the outer circumference of each lens. (See Figure 4 for steps 1-3)
   

   Caution: Use care when inserting the lenses into the lens insulator casing. Putting excessive stress on this casing can break or crack it. If this happens, do not attempt to operate with a defective lens insulator, it must be replaced.

2. Starting with the entrance lens 1, set the lens into the end groove in the lens insulator and rotate the lens until you feel the ball seat into the circular recess. 
3. Insert the next four lenses, in numerical order, into the lens insulator.
   
   

   
   
   Figure 4. Assembly of lens into the lens insulator. The lens chamber's open end always faces the entrance lens 1. Rotate each lens until you feel the ball seat into the circular recess. It's easier to insert lens 5 on an angle because the lens stack at this point makes the insulator less flexible. 
   
   

4. Insert the extractor ceramic insulator into the source body (see Figure 6 for steps 4-6)
5. Insert the lens stack encased in the insulator into the source body. The engraved numbers face the full opening extending to the end of the source body. Verify that the ceramic is sitting flush at the end of the source body. (See Figure 5)

   
   Figure 5. Ensure that the grooves are aligned when inserting the lens. 

6. Using the T6 Torx driver, install and secure the gold plated setscrew and lock ring lens insulator that holds the lens assembly in place

   
   
   
   Figure 6. Assembly of lens insulator into the source body.
   
   

7. Place the heater/sensor assembly over the guide pins on the source body with the four electrical pins oriented down the flat side of the source body. (See Figure 7 for steps 7- 13)
8. Place the repeller onto the heater/sensor assembly with the flat side of the repeller circumference aligned with the interface socket in the source body.
9. Place the source mount over the repeller.
10. Finger tighten the two gold plated screws using a T6 Torx screwdriver to secure the source mount to the source body.
    

    Caution: Do not overtighten the screws in the source body. Damage may occur to the repeller.

11. On the side of the filament block opposite the finger grip, orient the dual filament ceramic holder so that it lines up with the flat of the filament block. Fully insert the three filament leads into the filament block.
12. Inset the filament block into the source holder and use a T6 Torx screwdriver to secure it to the holder with the gold plated screw.
    
    

    
    
    Figure 7. Assembling the filament, filament block, heater/sensor assembly, and repeller into the source body. 
    
    

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