- HPLC Autosamplers (715, 717, Alliance, 2695, 2795)
- ACQUITY UPLC Sample Managers
The syringe needle of an autosampler does not go all the way to the bottom of a vial, so some sample always remains. This is referred to as the "residual volume" of the vial. Some vials have a tapered bottom, which decreases the residual volume. This can be important if the sample is valuable or if only a small amount is available.