Document 4400Q902 version 1.02
Page 11 of 18
RX2000 User Manual
which allows the drive syringes to be checked for the presence of air bubbles during filling and also to provide
visual assistance when making a syringe change (i.e. when fitting a different volume syringe).
2.2
The drive syringes
The drive syringes are brought outside the thermostat bath via a rubber grommet that has a double sealing edge.
This seal allows the user to readily interchange syringes of different diameters (volumes of 0.1 ml to 2.5 ml) with
the only proviso being that the thermostat bath should first be emptied.
The RX2000 uses three specially designed flow distribution valves, two of which are used to load the drive
syringes and the third to control the removal of waste solution from the flow line. The two drive syringes have
screw thread location whereas the reservoir, stopping and waste syringes use Luer location. The displacement of
the stopping syringe piston is controlled by an adjustable stop bar on which is mounted the trigger microswitch. A
smooth action push block with a stainless steel guide allows the contents of the drive syringes to be driven into
the flowline with consistent performance.
2.3
Reagent control valves
A schematic of the valve positions for loading the drive syringes and for a stopped-flow drive is shown in Figure
Figure 2.2: the valve positions in the Load (left) and Drive (right) positions
