How to remove the QDa pumping block - WKB52382

OBJECTIVE or GOAL

Removing the QDa pumping block (700009678) to service the stepwave and front-end optics can be difficult. This article includes suggestions for safely removing the pumping block.

ENVIRONMENT

• ACQUITY QDa Mass Detector

PROCEDURE

Methanol Method

1. Remove the Source Enclosure from the instrument
2. Remove the cone.
3. Use the 3 mm hex wrench to remove the four screws which secure the pumping block to the instrument
4. Insert a 2.5 mm hex wrench into one of the top two screws on the pumping block
5. Use an S-shaped/offset screw driver to act as a lever to help break the seal between the rear pumping block gasket and the instrument (as shown below)
6. Start to wiggle the assembly free.
7. Apply methanol to the edges of the screw holes and around the edges of the pumping block.
8. Continue to wiggle the assembly free.

Leverage - A long-handle screwdriver can be used to provide leverage

1. Place a long-handle screwdriver in the preformed grove on the pumping block.
2. Brace the end of the screwdriver on the front panel.
3. With leverage, carefully wiggle the pumping block to free it from the QDa body.
   
   

ADDITIONAL INFORMATION

Do not use the Ion Block as a gripping point or lever to remove the pumping block. This can cause damage to the Ion block inserts which can lead to vacuum problems.