Dionex ASE 150, Operator'S Manual

Page: 25 / 176

2 • Description
Doc. 065207-02 9/08
17
Performing the Extraction
After you complete the preparation steps described on page 16 and press
START
the second time, the ASE 150 performs the extraction. The extraction process
consists of six main steps.
1. Fill the cell with solvent —the
pump is turned on and the
static valve is closed (see
Figure 2-4 ). Solvent is pumped
into the sample cell until the
cell pressure reaches
10.35 MPa (1500 psi).
Thereafter, the static valve
opens occasionally to maintain
the pressure at 10.35 MPa
(1500 psi).
2. Heat the cell (equilibration) —
the temperature in the cell is
heated to the set point
specified in the method.
3. Static extraction —the cell
remains filled with the solvent
at the temperature set point.
Figure 2-4. Extraction Process Schematic
4. Rinse with fresh solvent —the static valve opens and the extract flows into the
collection vessel. Fresh solvent is pumped through the cell.
5. Purge solvent from the system —the purge valve opens and gas purges the
remaining solvent from the cell into the collection vessel.
6. Relieve pressure —the pressure relief valve opens and residual pressure is
released from the cell.
NOTE Static extraction and rinsing can be repeated multiple
times.
Pump
Pressure
Relief
Valve
Static Valve
Waste
Bottle Collection
Vessel
Sample
Cell
Oven
Solvent
Bottle
Nitrogen
Purge Valve