5 • Service
Doc. 031644-02 9/03
5-5
5. Use tweezers to carefully remove the O-ring from the groove (see Figure 5-2).
Do not scratch the groove.
6. Install a new O-ring (P/N 054136) in the groove.
7. Place a new window (P/N 054135) into the counterbore in the window nut.
Screw the window into place.
8. Using the windows replacement tool, tighten the window nut until snug and
then turn an additional one-quarter turn.
9. Repeat Step 3 through Step 8 to install the second window.
10. Connect the flow cell to the pump and pressurize to 2.07 MPa (300 psi).
Check for leaks around the windows. If there is any leakage, tighten the
window nut(s) with the windows replacement tool until the leak stops. Dry the
cell thoroughly with a lint-free, optical-grade tissue.
11. Reinstall the flow cell in the optical bench.
5.6
Replacing the Flow Cell
Replace the flow cell if a colored substance stains the cell interior and
cleaning the cell (see Section 5.2) does not remove the stain, or if excessive
backpressure cracks the silica windows and you do not want to replace them
(see Section 5.5).
1. Remove the flow cell from the optical bench (see Section 5.4).
2. Squeeze the handle of the new flow cell (PEEK, P/N 056346; stainless steel,
P/N 056126) and insert it straight into the optical bench. Release the handle,
and then pull it forward slightly. If there is a click, the cell is properly
mounted. If there is no click, rotate the handle slightly just until the cell clicks
into place.
3. Thread the flow cell inlet tubing through the tubing guide on the lamp cover
and reinstall the tubing bracket (see Figure 5-1).
4. Thread the flow cell outlet tubing through the slot on the side of the flow cell
cover. Replace the cover and reconnect the cell inlet and outlet tubing.
5. Push the detector front panel into place.
Scratches in the groove will prevent the new O-ring from sealing
properly and will cause leaks.
