How to install gold-plated compression screw with two-piece ferrule on capillary - WKB284849

OBJECTIVE or GOAL

Correctly installing gold-plated compression screw with two-piece ferrule on capillary without leak or damaging fittings. Procedure is same for both Long flats screw and Short flats screw, see picture for both types below. The tightening for first time use and reinstall are both described.

ENVIRONMENT

• ACQUITY UPLC

PROCEDURE

1. Align the screw with ferrule on capillary/tubing as shown in picture below.
   
2. Make sure the capillary is at the bottom of the fitting hole.
3. Tighten the screw finger tight. Preferably mark the position with a marking pen.
4. For first time use: Tighten 3/4 of a turn with a wrench.
   
5. For reinstalling already seated ferrule: Tighten fitting 1/6 of a turn after finger tight.
   

ADDITIONAL INFORMATION

Perform priming and leak test to confirm fitting is seated properly.

To prevent bandspreading, ensure the tubing fully bottoms in the fitting hole before tightening the compression screw.

For easier accessibility, use long compression screws to attach tubes to the vent valve.

Whenever you loosen fittings during maintenence, examine for cracks, stripped threads, and deformations.

Do not re-seat stainless steel ferrules more than six times.