Metrohm 761 SD Compact IC - Manual (Page 10)

1 Introduction
761 SD Compact IC / Instructions for Use 8. 761.1043
2
All components coming into contact with eluent and sample are metal-
free. Ready-to-use eluents in certified MPaks are supplied for soft drink
analysis.
The 761 SD Compact IC is operated by means of a PC connected to
the RS232 interface. The 761 SD Compact IC can be controlled by the
«IC Net» software or by the “master” «IC Cap» software.
The systems required for soft drink analysis (and the methods linked to
them) are supplied on the installation CD.
The following instrument versions are available:
• 2.761.0420 761 SD Compact IC
• 2.761.0520 761 SD Compact IC with IC Sample Processor 766
for automated sample change
Principle:
The eluent flows on the eluent path through the injection valve into the
separating column and then into the detector. The sample flows on the
sample path also through the injection valve and the red sample loop
visible at the centre of the injection valve. At a specific instant (
ject>; controlled by the program), the flow paths in the injection valve
are switched and the sample loop is reintegrated in the eluent path (it is
now no longer a part of the sample path). The sample quantity which is
located in the sample loop at the switchover instant is then entrained
with the eluent stream, thus entering the separating column (where the
actual chromatographic separation of the components occurs) and, fi-
nally, chromatographically separated, into the conductivity detector.