Replacing Air Needles - Waters 2707 Operator's Manual

Replacing air needles

To replace the air needle
1. From the Maintain menu in the 2707 Console, click Replace and the
needle.
Result:
2. Follow the instructions in the Replace Needle warning box, and then
click OK.
3. Loosen the needle connection nut (see the preceding figure).
4. Loosen the nut that connects the tubing to port 4 of the injection valve
(see the preceding figure).
5. Grasp the sample needle's tubing, and withdraw the needle from the
fitting.
6. Begin removing the air needle by unscrewing the chrome locking nut
(see the preceding figure).
7. Pull the air needle downward and out of its fitting.
8. Remove the chrome locking nut from the old needle, and screw the new
height adjustment nut into the chrome locking nut.
Tip:
Ensure that the O-ring seal is in the locking nut and that the thread
of the height adjustment nut is even with the lower part of the locking
nut.
3-12 Maintaining the Autosampler
The needle moves to the exchange position.