Replacing the Radial Pre-optics Window

The axial pre-optics window protects the internal components from particulates and fumes from the plasma.

Always turn off your instrument before attempting to the window and do not operate the instrument while the window is removed.

There are three steps to the procedure:

• Removing the radial pre-optics window assembly
• Replacing the radial pre-optics window
• Installing the radial pre-optics window assembly

Figure 1. Torch compartment

Where:

1. Cone	4. Snout	7. Torch
2. Axial pre-optics window assembly	5. Radial pre-optics window assembly
3. Cone thumb screws	6. RF coil

To remove the radial pre-optics window assembly:

1. Turn off the ICP-OES instrument.

Hot Surface The torch compartment and components in it become extremely hot during instrument operation and remain hot for some time after the instrument has been switched off. Allow the torch compartment to cool for at least five minutes before attempting to remove any component. Use heat-resistant gloves.

2. Remove the torch and snout. See Figure 1.
3. Using a Phillips head screwdriver, unscrew the two radial pre-optics window assembly screws.
   
   
   Figure 2. Removing the two radial pre-optics window assembly screws
4. Gently pull the radial pre-optics window assembly towards you and then remove.

Do not hit the RF coil.

5. Check the radial pre-optics window for contamination. Replace or clean if needed.

To replace the radial pre-optics window:

Figure 3. Radial pre-optics window assembly

Where:

1. Radial pre-optics window

2. Radial window nut

1. Unscrew the radial window nut from the assembly.
2. Remove the radial pre-optics window from the assembly. It should slide out easily.

Always wear gloves when replacing the window. Hold the window by the edges. Oils from your hands will damage the window.

5. Insert the radial pre-optics window into the assembly.
6. Screw in the radial window nut into the assembly.

To install the radial pre-optics window assembly:

1. Insert the two radial pre-optics window assembly screws into the assembly.

2. Insert the radial window assembly into the instrument.
3. Line up the two screws with the screw holes.

4. Tighten the two radial pre-optics window assembly screws.
5. Slide the snout in and then gently push to fit the snout onto the radial pre-optics window assembly.
6. Check snout alignment
7. The tabs on the snout should be at the bottom and horizontal to each other. See the red rectangle on the image below.
8. Insert the torch. The slot on the torch quartz tube should be parallel with the slot on the snout. See red rectangle on the image below.
   
   
   Snout alignment