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This section is shown only when the function is supported. |
Automatic Delay Volume Reduction is used to switch the flow from the injector from the main flow path to bypass after injection has taken place. This reduces the delay volume for low volume techniques.
You can specify the point during the analyses when the valve switches to bypass. This is done by setting the Sample Flush-out Factor, which is available in the Auxiliary section.
Automatic Delay Volume Reduction in either mode can be run in conjunction with Overlapped Injection.
Overlapped injection provides faster throughput of samples by allowing the preparation of the next injection while the current injection is being completed. The net effect is more samples performed during a given period of time, although the actual individual injection times remain constant. When overlapped injection mode is employed, the next sample is taken up into the autosampler as the first sample is being injected.
Choose the When sample is flushed out option to specify that the sample can be prepared directly after the current sample has been flushed out.
Choose the After XX min option to specify that the next sample is prepared after a user-defined period of time.
The parameters for overlapped injection are specified as part of the method. There are no parameters for overlapped injection to be specified in the sequence/worklist table. However, there are important restrictions to using Overlapped Injection in sequences/worklists:
In the sequence/worklist, all injections where you wish to use overlapped injection must use the same method. This is because the method provides the necessary information for sample location and volume to trigger the events leading up to the next injection while the current injection is being completed. Where different methods are specified, the sequence/worklist continues, but the overlapped injection is ignored.
Control samples may NOT be used. If a control sample is inserted in the sequence/worklist, there will be no overlapping in the following injections because the Control sample might fail and the sequence/worklist would then be stopped.
Important restrictions for using Pretreatment/Injector Programs with Overlapped Injection:
Overlapped Injection can handle pre-injection tasks but not post-injection tasks. This is because the next sample is being prepared for injection during the current injection.
The command INJECT may not be used in an injector program with Overlapped Injection.