Thermo Scientific AI 3000, Руководство по эксплуатации

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AI 3000/AS 3000 II Control
Guidelines for Programming with Different Injectors
70 AI 3000/AS 3000 Sampling System - Operating Manual Thermo Scientific
Guidelines for Programming with Different Injectors
To get the best results from your AI 3000/AS 3000 II, follow these guidelines when
programming the autosampler method according to the injector in use. Refer to:
• SSL Inlet (TRACE GC Ultra/FOCUS GC)
• Nano-Volumes Injections in S/SL Inlets
• Packing a SSL Liner
• S/SL Inlet with a Merlin Microseal™
• PTV Inlet
• PTV Inlet with a Merlin Microseal™
• PKD and PPKD Inlets
SSL Inlet (TRACE GC Ultra/FOCUS GC)
The AI 3000/AS 3000 II can inject in a hot SSL inlet using two distinct needle insertion
modes: “
Standard ” and “ Minimum ”.
In the first mode the needle penetrates for almost its whole length and a dwell time is
programmed to provide needle heating. In the latter the needle penetrates for a minimum
depth and for the minimum time allowing to minimize contact of the needle with the hot
inlet.
These two needle insertion modes are conceived to optimize respectively the “ Hot Needle ” and
the “ Cold Needle ” injection techniques.
• Cold needle technique — (Minimum depth mode) prevents boil-out from the needle
and lets the sample to enter the injector nearly entirely in liquid phase. This injection
technique requires the use of packed liner to stop the liquid run (see
“S/SL Inlet with a
Merlin Microseal™” on page 73 ).
• Hot needle technique — (Standard depth mode) requires a minimum pre-dwell time to
heat the needle (usually 3-5 seconds) to achieve a complete expulsion of the sample from
the needle in form of a spray. This technique permits the use of empty liners.
Table 14 reports a summary of injection parameters and conditions for the two SSL
techniques. For your reference the type of liner and the column insertion inside the inlet are
also reported.