Waters ACQUITY UPLC M-Class System Manual page 41

Figure 2–11: Reinstalled
Flats
Compression screw
Lock ring
Ferrule
Tighten the fitting finger-tight until first resistance is felt, plus as much as an additional 1/4-turn
using a 1/4-inch open-end wrench.
Figure 2–12: Reinstalled tightening
2.6.1.11 PEEK sample needle fittings
The sample needle uses a PEEK compression fitting and two-piece, flat-bottom ferrules. The
compression fitting and ferrules differ slightly, depending on the sample needle's outside
diameter.
The sample needle fitting is sometimes preset on the needle. Where it is not preset, assemble the
fitting as shown in
ring faces the flat-bottom ferrule. Doing so ensures that the ferrule is correctly compressed onto
the needle tubing.
PEEK fitting with flat bottom
November 26, 2019, 715003588 Revision C
Page 41
ferrule, ensuring that the thin wall of the locking