Metrohm 788 IC Filtration Sample Processor - Manual (Page 9)

1.1 Instrument description
788 IC Filtration Sample Processor
1
1 Introduction
1.1 Instrument description
The 788 IC Filtration Sample Processor can be used for automating
ion chromatographic determinations including in-line filtration, espe-
cially in combination with Metrohm IC system instruments. It is possible
to apply and automate existing procedures for sample preparation us-
ing the ultra-filtration of the 788 IC Filtration Sample Processor.
The 127 sample tubes with a volume of 11 mL are arranged on the
sample rack in three rows, which guarantees easy access and unre-
stricted programming. Two additional rinsing positions allow sample in-
troduction free from cross-contamination even with widely varying sam-
ple matrices. Sample tubes made of polypropylene are standard. To
protect the samples from external contamination, the tubes can be
hermetically sealed.
Sample filtration and introduction to the injector is achieved by means
of its integrated double-channel peristaltic pump. The sample is con-
veyed by one channel of the pump through the ultra-filtration cell pass-
ing the membrane. At the same time the filtrate is aspirated off from the
rear of this membrane and transferred to the sample loop by the sec-
ond channel of the pump. A PEEK needle for sealed or a PEEK tube for
open sample tubes can be used alternatively.
The sequences for the processing of each sample are freely definable
within broad boundaries. The same is true for the start and final se-
quences that are executed once either before or at the end of a sample
series. With the help of the LEARN mode, which is provided for creating
process methods, methods can be created easily and stored as user
methods.
Preprogrammed standard methods for the most common modes of
operation allow to use the 788 IC Filtration Sample Processor directly,
with only little programming effort. The time frame can be given by the
788 IC Filtration Sample Processor; alternatively, the whole sequence
can be managed by the «IC Net» remote control software via the
«
Queue» (sample table). The RS232 interface built in as standard al-
lows remote control of the 788 IC Filtration Sample Processor from a
PC.