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Clarity Chromatogram Measurement and Evaluation

4.3.1.2 Continuous (Preliminary) Measurement Processing

While an analysis is running the already acquired part can be evaluated

(while the analysis continues) using the Snapshot command from the

Single Analysis or Data Acquisition windows. This command is almost

identical to the Stop command but does not stop the analysis. The

Snapshot is suitable e.g. for a preliminary evaluation of a prolonged

analyses.

The Snapshot does not increment the counter of the analyses (%n) and

a warning message regarding an eventual overwrite of the existing

chromatogram will be displayed only when the Snapshot command has

been used in the analysis for the first time. Any changes will then be

overwritten by next use of the Snapshot command or after the end of

the analysis in progress.

4.3.1.3 Control of External Devices

The Clarity station (when using A/D converter) is able to control

external devices equipped with control inputs (pumps, temperature

programmers, autosamplers, etc.). The Event Table, included in each

method, can control up to eight inputs on the internal or four inputs on

the external A/D converter. Each line of the table defines a single

condition - event - and, if the condition is satisfied, a set a specified

output to the prescribed value. Examples of events: the expiration of a

preset analysis time - Time, the decrease of a detector signal below or

increase above, a preset value measured either from zero - Input or

from the value at the start of the current analysis - Input Rel.

When contradictory requirements involving a single output occur, the

last command issued will be in control.

When using a multi-detector measurement there will be a separate

Event Table controlling the outputs of the A/D converter and

containing the corresponding channel for each detector.

Event Table creation and modification

To display the Event Table invoke the

Method Setup – Event Table dialog

command from the

Instrument window.

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Clarity 420 Guía de usuario Pagina 42