Bio-Rad ChromLab™ Software - Manual (Page 201)

The Detectors
Instrument Guide | 199
7. Locate the flow cell. The flow cell should include
 Two bolts
 One square rubber gasket
8. Place the flow cell into the socket on the UV monitor.
Note: Ensure that the arrow on the top of the flow cell is pointing to the
right, and that the two bolts on the flow cell align with the bolt holes in the
socket. The guides on the bottom of the flow cell help to prevent inserting
the flow cell incorrectly.