Metrohm 788 IC Filtration Sample Processor - Manual (Page 83)

4.3 Methods
788 IC Filtration Sample Processor
75
4.3 Methods
4.3.1 Structure of a method
A method consists of the following parts:
x Number of samples to be processed
x Process sequences (start, sample and final sequence)
x Definition of the various instrument settings
(changer settings, manual stop options)
These method parameters are accessible by pressing the
key (see section 4.3.2). With the key, methods can
be stored, loaded and deleted (see section 4.3.8).
A
sequence is a succession of commands that are carried out in the
order specified during automatic processing of a sample series. There
are functions for controlling lift and pump and for moving the turntable
(racks). External instruments (732 IC Detector, 709 IC Pump, 752 Pump
Unit, etc.) can be controlled using the corresponding commands.
Processing a sample series is accomplished in three phases. These
are:
x Start sequence
Sequence of commands that is exe-
cuted once at the beginning of a series.
x Sample sequence Sequence of commands used for each
sample.
x Final sequence Sequence of commands that is exe-
cuted once at the end of a series.
sample sequence
start sequence final sequence
number
of samples
normal state
The creation of sequences is done in the submenus '>start se-
quence' , '>sample sequence' and '>final sequence' , which are ac-
cessible via the parameter menu (see section 4.3.2).
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.
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 operation (see sec-
tion 4.4). However, in a sequence these can exhibit different or more ex-
tensive selection possibilities.