Removing and Installing a Syringe on the Agilent 7693A Autosampler

This Information Applies To: Agilent 7693A Automatic Liquid Sampler

Issue:

The automatic liquid sampler syringe may need to be replaced, in case it is worn or dirty.

Steps to follow

To remove the syringe:

1. Open the injector door.

2. Slide the syringe carriage to the top position if necessary.

3. Completely loosen the plunger thumb screw until it reaches the stop, and lift the plunger carrier off of the syringe plunger.

4. Open the syringe latch by swinging it in a counterclockwise direction.

5. Carefully pull the top of the syringe out of the flange guide, then lift the needle out of the needle support foot. (See Figure 1)

   Caution: Be careful not to bend the syringe needle. Only pull the syringe out of the carriage until clear. The needle bends easily when still seated in the needle support guide.

   
   
   Figure 1. Removing the syringe from the automated liquid sampler.
   
   

To Install the syringe:

Caution: Failure to use an on-column syringe when injecting into an on-column inlet could damage the injector, syringe and column.

1. Open the injector door.

2. Slide the syringe carriage to the top position if necessary.

3. Open the syringe latch by swinging it in a counterclockwise direction.

4. Lift the plunger carrier to the top position.

5. Carefully pass the syringe needle through the guide hole in the needle support foot. (See Figure 2)

6. Align the syringe flange with the flange guide and press the syringe into place, keeping the needle end in the guide hole of the needle support foot. Make sure that the flat edge of the syringe flange faces out. (See Figure 3)

   
   

   Caution: Failure to correctly install the syringe flange into the flange guide will result in damage to the syringe plunger.

   
   
   
   Figure 2. Mounting the syringe.
   
   
   
   Figure 3. Syringe flange position
   
   

7. Close the syringe latch by swinging it clockwise until it snaps in place.

8. Loosen the plunger screw entirely by turning it counterclockwise until the stop is reached.

9. Slide the plunger carrier down until it is completely over the syringe plunger, and tighten the plunger thumb screw until finger- tight. (See Figure 4)
   
   

   
   Figure 4. Securing the syringe in the automated liquid sampler
   
   

10. Manually move the plunger carrier up and down. If the syringe plunger does not move along with the carrier, repeat the previous steps until installed correctly.

11. Check that the plunger thumb screw is secure and tight. If the carrier is not completely attached to the syringe plunger, it may become detached after a few injections.

12. Close the injector door.

Learn more how to effectively maintain your Agilent 7693 Automatic Liquid Sampler: SI-7693-1100s - Agilent 7693A ALS Basic and Advanced Operation and Maintenance e-learning available from Agilent education.