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5-15
Operation - Advanced Use 5
This is realized using the 402 by pressing the probe’s
command button with increasing rapidity as you
approach the neutralization point. Care must be
taken in selecting the dispense flow rate.
• Press Titrate, Titrate Screen (1) appears. Select
either reservoir or probe as the source using the
Chge soft-key, then press ENTER to confirm your
choice.
• Press the Next soft-key, key in the volume to
aspirate, then press ENTER, Titrate Screen (2)
appears. Normally, you would aspirate sufficient
liquid for several titrations.
• Press the Next soft-key, Titrate Screen (3) appears.
• Follow the instructions given on the screen; you
press the command button on the probe to aspi-
rate and to dispense, when prompted to do so by
the command light on the probe:
-a steady light means you are to aspirate or
dispense liquid,
-a flashing light means you are to aspirate air
via the probe.
Read the volume on the screen, Titrate (4) Screen
(for example), after completing each titration.
Conclude the current titration by pressing STOP or
End (see Prime for details).
Tasks - Detailed Descriptions
Your Method may consist of one or more of the
following tasks. Each task consists of a pre-defined
protocol, from which you select the required mode
of operation, and into which you insert the required
parameter values.
In-run Prompts
For optimization purposes, all volumes and flow
rates, which can be entered as parameters in a task,
can be defined as In-run Prompts. When editing
the task, you key in a value, and then a question
mark (?), the corresponding flashing value has to
be validated or changed before the Method runs. It
is not necessary to re-edit the method to modify the
chosen parameter.
Software
Titrate Screen (1)
Titrate Screen (2)
Titrate Screen (3)
Titrate Screen (4)