Semi-Demountable Torch Assembly and Disassembly

The semi-demountable torch models allow the torch quartz tube to be separated from the torch body and injector for easier cleaning.

• Torch assembly
• Torch disassembly

To prevent damage to the torch, always take care when handling or storing it. To prevent damage to the instrument, do not use the torch if it is damaged.

Torch components where 1 is the torch outer tube set, 2 is the injector, 3 is the seal, 4 is the gas ports, 5 is the torch body, and 6 is the ball joint

Torch assembly

To assemble the torch:

1. Position the flat side of the torch seal so that it faces the top of the torch quartz tube.
   
   
   Flat side of torch seal

2. Slide the torch seal onto the tub-set from the bottom.
   
   
   Torch seal on torch quartz tube

3. Position the torch seal so the top face of the seal is aligned with the bottom of the "T" alignment mark.

Alignment mark

4. Maintaining a straight parallel movement, carefully slide the quartz outer tube-set into the torch body. Avoid contact between the quartz tube-set and the injector.
   
   
   Torch inserted into torch body

5. Position the torch quartz tube so that the groove on the torch body aligns with the etch mark on the torch quartz tube.
   
   
   Torch alignment

6. Press the torch fully into the torch body and then press down on the torch securing ring.
   
   
   Torch quartz tube inserted into torch body

Torch disassembly

Hot Surface The torch and torch compartment become warm during instrument operation and remain so for some time after the plasma has been switched off. Allow the plasma compartment to cool for at least five minutes before accessing the plasma compartment. Allow the torch to cool for two minutes before touching the outer tube or attempting to dismantle the torch.

To disassemble a semi-demountable torch:

You may need a flat head screwdriver to loosen the torch seal if you cannot slide the torch quartz tube out of the torch body by hand.

1. Loosen the torch seal by prying it up by hand at the slot indicated by the orange circle on the image below.

Loosen the torch seal by hand.

Only use a screwdriver if you cannot loosen the torch seal by hand. To use a screwdriver to loosen the torch seal: Insert the screwdriver into the slot between the torch securing ring and the torch body. Gently move the screwdriver up and down to separate the torch securing ring from the torch body. Repeat Steps a and b on the slot on the opposite side.

2. Maintaining a straight parallel movement, carefully slide the quartz outer tube-set off the torch body. Avoid contact between the quartz tube-set and the injector.
   
   
3. Slide the seal off the top end of tube-set to remove it in the direction indicated by the arrow.
   
   

See also:

• Torch cleaning procedure
• Learning