Thermo Scientific Dionex Easion, Руководство оператора

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2 • Description
Doc. 155028-01 08/20
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Eluent from the eluent bottle is drawn into the pump . The pump pushes
the eluent through the pressure transducer , which measures the system
pressure, and through a pulse damper , which smooths minor pressure
variations from the pump to minimize baseline noise.
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The eluent then flows into the injection valve . After sample is loaded into
the sample loop and the injection valve is toggled to the Inject position, eluent
passes through the sample loop, pushing the sample into the eluent stream.
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The eluent/sample mixture is pumped through the guard and separator
columns , where the ions are separated by the ion exchange process.
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The eluent/sample mixture then flows through the suppressor , which
suppresses the conductivity of the eluent and enhances the conductivity of the
analytes. Regenerant flows continuously through the suppressor, restoring the
ion exchange sites to their original state.
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The eluent/sample mixture then flows through the conductivity cell , where
the analytes are detected. A signal is produced and sent to Chromeleon
software.
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Finally, the eluent flows out of the cell and into the regenerant bottle , where
it pressurizes the regenerant and forces it into the suppressor.
2.3 System Component Details
2.3.1 Pump
The Dionex Easion pump is a microprocessor-based isocratic eluent
delivery system. Its variable speed, dual-piston series design ensures
pulse-free pumping for the most demanding applications.
Primary Pump Head
The primary pump head pumps eluent into the secondary pump head (see
Figure 2-5 ). The check valves, which prevent reverse flow through the
pump, are located on the bottom (inlet) and top (outlet) of the primary
pump head.
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