ICS-90 Ion Chromatography System
B-28 Doc. 031851-05 12/04
B.14 Setting the Pump Flow Rate
1. Locate the production test chromatogram on the Dionex Quality Assurance
Report (supplied with the separator column). Note the backpressure and flow
rate listed for the column.
2. Pull out the flow rate knob on the component mounting panel (see
Figure B-21
) and turn the knob slowly to the right to begin adjusting the
pressure.
NOTES
• There is about a 10-second delay between adjusting the knob and the
pressure reading response on the Chromeleon Control panel.
• The flow rate shown on the Control panel is a recorded value only. It
does not change when the flow rate knob is adjusted.
3. Adjust the knob until the pump pressure reading on the Control panel reaches
the figure listed on the production test chromatogram.
NOTE The production test chromatogram is produced without
a guard column. If a guard column is installed, adjust
the knob until the pressure is about 1.4 to 2.1 MPa (200
to 300 psi) above the backpressure listed for the
separator column alone.
4. Measure the flow rate, using one of the following methods:
• Volumetrically (recommended for most applications): Measure the
volume of liquid collected over a measured time period. The Ship Kit
includes items for measuring the flow rate volumetrically.
• Gravimetrically: Weigh the mass of liquid collected over a measured
time period. The gravimetric method is slightly more accurate than
the volumetric method.
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