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3.4 Solvent Delivery
Requirements
Figure 3.6.
MF-4000 Pulse Damper.
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Electrochemical detection requires a solvent delivery system that delivers a constant rate of
flow. The detector will respond to long-term and short-term changes in flow rate. A gradual
increase in flow rate will produce a gradual increase in baseline current response. Likewise,
a rapid cycling in flow rate will cause a sinusoidal baseline response. Both types of flow
rate changes will severely limit detector performance. Ideally, this instrument will be part of
a BAS 480 Liquid Chromatograph. The BAS PM-80 Pump in this system provides excellent
flow-rate precision and minimal pump pulsation. The PM-80 Pump may be connected di-
rectly to the injection valve port (see #26 in Figure 3.1).
The PM-80 pump includes a pulse damper to reduce short-term flow rate fluctuations. For
other pumps, however, an external pulse damper may improve performance. BAS offers a
rugged pulse damper (P/N MF-4000) that is suitable for use with any LCEC system (see
Figure 3.6). It is connected between the pump and injection valve. The damper contains a
flattened coil of 1/4" tubing which expands at high pressures and flattens at low pressures.
This effectively steadies the flow rate over time.
Section 3. Installation
11
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