ICS-3000 Ion Chromatography System
22 Doc. 065031-04 1/08
2.2.5 Piston Seal Wash System
The piston seal wash system consists of a peristaltic pump, a reservoir
containing wash solution, and the connecting tubing. The wash solution is
usually ASTM Type I (18 megohm-cm) filtered and deionized water.
When seal washing is activated, the back of the main piston seal is rinsed
with wash solution; this prolongs seal lifetime by preventing eluent
crystallization on the seal surfaces.
Notes About the DP Piston Seal Wash System
The piston seal wash system is designed for use with only one of the two
pumps in a DP module. When the DP is shipped from Dionex, the seal
wash system is connected to pump 1 (the bottom pump). If necessary,
connect the seal wash system to pump 2 (the top pump), instead. For
instructions on how to replumb the system, refer to Section 4.5
.
NOTE Dionex offers an External Seal Wash Kit
(P/N 063518) for users who need to operate a piston
seal wash system for both pumps in the DP.
Installation instructions are provided in the kit.
2.2.6 Static Mixer
A GM-3 or GM-4 static mixer is installed after the secondary pump head
(see Figure 2-3
). In the gradient pump, the mixer helps to ensure that
proportioned eluents are mixed thoroughly. In the isocratic pump, the
mixer is optional, but can function as a pulse damper.
The DP/SP gradient delay volume is 600
μL when a GM-3 is installed and
380
μL when a GM-4 is installed. The gradient delay volume (or dwell
volume) is the volume of liquid in the system between the point where the
gradient is formed and the point where it enters the column. This includes
the mixer, transfer tubing, and swept volume in the injector or
autosampler.
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