Injection mechanics

The sample needle goes through a specific sequence for each injection.

During an injection, the following sequence takes place:

1. The needle moves to the sample vial and aspirates sample from it.
2. The needle carriage inserts the needle into the injection/wash port.
   Note: The entire injection port assembly rests on a spring and is guided inside a metal housing.
3. As the needle is inserted into the injection/wash port, it presses against the seat and forms a high-pressure seal.
4. The injection valve turns to start the injection.
5. The wash pump washes the outside of the needle during the injection.

Angled wash manifold

Sample needle support sleeve

Fitting

Seat

Seat port assembly

Seal cup locking nut

Compression spring

Needle wash housing

The following figure shows standard injection mode cycle time.

Contents

• Wash system
  
• Priming modes
  
• Thermal system