Metrohm 730 Sample Changer - Manuel (Page 53)

3.5 Methods and Sequences
730 Sample Changer, Introduction 50
The creation of sequences is done in the submenus '>start se-
quence', '>sample sequence' and '>final sequence', which are ac-
cessible via the main menu '>parameters' (press <PARAM>).
A sequence is organized in lines. When a command is entered, a
new line with the corresponding command is added after the
command that is displayed at the moment. The line number is
visible in the display. 99 lines per sequence are possible.
Deletion of a line is done by pressing <DELETE>. The lines that
follow are shifted upwards.
A new line can be added later. This is accomplished with
<INSERT> whereby an empty line is inserted before the current
line. The lines that follow are shifted downwards.
In a command sequence, the commands that are on the numerical
keypad as alternate functions can be used. For the most part
these are the same commands that are used for manual opera-
tion. However, in a sequence these can exhibit different or more
extensive selection possibilities.
During the course of a method it is possible to change all entries in
the menus "configuration" and "parameters". These changes have
an immediate effect on the course of the method (with few excep-
tions, see page 83).
Care should be taken when editing process sequences. These can
be edited "live" (including insertion or deletion of a command line).
The TRACE and LEARN functions however, are not available in
this case. Testing of the edited function is therefore not possible.
Illogical command sequences could easily result, which would
cause an error condition and force the interruption of a sample
series.
3.5.2 LEARN Mode and TRACE Function
When editing a method, the parameters of a command are most
easily determined experimentally, i.e. by manual execution, and it
is for this reason that certain commands are "teachable". The
LEARN function makes the manual execution of particular changer
commands possible during the editing of a sequence. The result-
ing parameters (for example, the lift position or the status of the
input lines) can be taken over in the current command line. The
LEARN function can be used repetitively. When times or volumes
are "learned", the repetitive values are added up. This is especially
useful for the establishment of the pump time where the optimal
length of the rinsing process can be interactively determined in this
way.