Metrohm 788 IC Filtration Sample Processor - Manual (Page 88)

4 Operation
788 IC Filtration Sample Processor
80
4.3.6 Commands for sequences
The following commands are programmable within a sequence. Most of
them are also available in manual operation but may vary partially in
their operation or exhibit a limited parameter selection (see section 4.4).
SAMPLE
7
SAMPLE
>start sequence
1 SAMPLE: = 1
=,+,–; 1}999
Define current sample
position
The SAMPLE command defines the rack position for the current sample
( SAMPLE = X ). This is stored as a index variable. It may be modified for
example, in a sample sequence ( SAMPLE + X or SAMPLE – X ), in order to
control the course of a sample series during processing.
The SAMPLE command does not have to be used for simple applica-
tions. As a general rule the first sample of a series is assumed to be in
rack position 1 unless specified otherwise. Therefore it is recommended
not to place the special beakers in the first rack positions; place them in
the highest positions instead.
Before starting a sample series, the position of the first sample can be
defined with the <SAMPLE> key in manual operation, as long as this
has not been defined in the method itself.
If a certain sample tube order is needed for each application of a
method, the position of the first sample can be defined in the start se-
quence with 'SAMPLE = X' and this setting can be saved with the corre-
sponding method.
If the SAMPLE command is not executed during a sample sequence,
the SAMPLE variable will be increased by 1 after every processing of
the sample sequence.
MOVE
8
MOVE
>sample sequence
2 MOVE 1 : sample
sample,spec.1}8,1}999
Position vessel /
Turn rack
The MOVE command can place the current sample tube or a special
beaker below the needle position by rotating the rack. An absolute rack
position can also be specified.
During method processing a MOVE command automatically sets the lift
to the shift position. In the parameter menu under '>changer settings'
the turning speed can be defined specifically for each method.
If there is no sample tube in the rack position chosen, this is not
recognized by the IC Sample Processor, and air is aspirated instead of
sample solution. Therefore always make sure that sample tubes are
placed at all rack positions defined in the processing sequence.