Agilent Technologies InfinityLab LC Series User Manual page 23

1 Introduction
Operating Principle
Needle Parkstation
The needle parkstation comprises two main assemblies: needle drive and wash
port.
Figure 8
Needle-Drive
The needle movement is driven by a stepper motor connected to the spindle
assembly by a toothed belt. The circular motion of the motor is converted to
linear motion by the drive nut on the spindle assembly. The upper and lower
needle positions are detected by reflection sensors on the needle station board,
while the needle-in-vial position is determined by counting the motor steps from
the upper needle-sensor position.
Agilent InfinityLab LC Series Vialsamplers User Manual
Needle Station
23