Waters 2489, Operator'S Manual

Page: 141 / 234

Maintaining the flow cell 4-7
• To prevent contamination, use powder-free finger cots or gloves when
touching the flow cell lenses or window.
• Take care to prevent scratching of the flow cell parts.
• Use a clean nonparticulating cloth or a similar clean surface in the work
area where you are removing, rebuilding, and replacing the flow cell.
Tools required
You need the following items to remove, clean, and replace the flow cell:
• 1/4-inch flat-blade screwdriver
• Torque wrench set to 128 in-oz (8 in-lb or 0.904 Nm) with 1/4-inch
flat-blade screwdriver bit
• Plastic tweezers
• Powder-free finger cots or gloves
• Lint-free swab
• Ethyl alcohol or methanol
• Nitrogen
Save all parts after removal unless otherwise indicated. Most of the removed
parts are needed when you reinstall a flow cell.
Removing the flow cell assembly
To remove the flow cell assembly:
1. Power-off the detector and disconnect the power cord.
2. After flushing and drying the flow cell (see “Flushing the flow cell” on
page 4-5 ), disconnect and cap the inlet and outlet LC tubing to the
detector.
3. Remove the front left panel cover.
4. Using a 1/4-inch flat-blade screwdriver, loosen the three captive screws
on the flow cell assembly front plate.
Caution: Always replace the flow cell gaskets when cleaning,
rebuilding, or replacing other flow cell components.