Metrohm 711 Liquino - Manual (Page 89)

4. Detailed description
711 Liquino, Instructions for use 83
4.5 SEQ mode - complex processes
The SEQ mode (sequence) of the Liquino allows complex process se-
quences with a total of up to 75 steps to be created. The individual steps
can consist of methods (stored modes) or auxiliary commands. Sequences
can be processed several times in automatic operation.
Applications in synthesis
For example, in synthesis applications in particular it may be useful to allow
several XDOS modes to be carried out one after another and to extend
these with time functions and communication commands.
An example:
Step 1:
wait for time (TIMER command)
Step 2: add solvent (XDOS method)
Step 3: switch on stirrer (CTRL remote command)
Step 4: fill 1st educt into apparatus (XDOS method)
Step 5: switch on heating bath (CTRL remote command)
Step 6: add 2nd educt drop by drop (XDOS method, temperature-
controlled)
Step 7:
wait for reaction (PAUSE command)
Step 8: switch off heating bath (CTRL remote command)
Applications in analysis
In analysis process sequences are used wherever simple instruments are
used to control individual automated systems. The SMPL mode is chiefly
used in such applications to carry out sample preparation. In the process
sequence various analytical instruments and peripheral units can be started,
time-controlled if necessary.
An example:
Step 1: Sampling (SMPL method)
Step 2: pH/mV measurement (CTRL remote command)
Step 3: Titration (SMPL method with start of titration)
Processing a sequence
A sequence is a series of part-steps which are carried out one after another.
Each step defines a command. The command 'Method' as a special case
causes a stored method to be loaded; this consists of a mode (e.g. XDOS,
etc.) with its specially defined parameters. The other commands which are
available carry out simple functions with one or two parameters. A sequence
can be processed several times without interruption. The parameter 'auto
start' determines the number of times it is carried out.