Metrohm 754 Dialysis Unit - Manual (Page 4)

1.1 Instrument description
754 Dialysis Unit
1
1 Introduction
1.1 Instrument description
The 754 Dialysis Unit is a unit for on-line sample preparation in ion
chromatography permitting the use of automatic sample dialysis di-
rectly before sample injection. It consists of a dual-channel peristaltic
pump for conveying the sample and acceptor solutions, and the actual
dialysis cell in which the ions from the flowing sample solution are en-
riched in the resting acceptor solution and then injected directly into the
IC system. This special Stopped-Flow Method (for which Metrohm
has applied for a patent) means that 100% of the sample concentration
can be achieved in the acceptor solution, allowing easy calibration with
external standards.
The 754 Dialysis Unit can be operated manually, via the ON/OFF
switch, or by remote control, via the remote interface.
Valve B, which is built into the 733.0020 IC Separation Center and
controlled by the 732 IC Detector, is required to operate the 754 Dialy-
sis Unit. For this variant, which is described in these Instructions for
Use, the following units are required:
Operation without suppressor
2.732.0010 IC Detector
2.733.0020 IC Separation Center
2.709.0010 IC Pump
2.754.0010 Dialysis Unit
Operation with suppressor
2.732.0010 IC Detector
2.733.0020 IC Separation Center
2.709.0010 IC Pump
2.754.0010 Dialysis Unit
2.753.0010 Suppressor Module
As an alternative to valve B, which is built into the IC Separation Center,
an external valve controlled via the remote output of the 732 IC De-
tector can also be used. This allows the 754 Dialysis Unit to be oper-
ated in combination with the following units:
Operation with suppressor
2.732.0010 IC Detector
2.733.0030 IC Separation Center
2.709.0010 IC Pump
2.752.0010 Pump Unit
2.754.0010 Dialysis Unit
External valve
More information about this variant is available from Metrohm on re-
quest.