Thermo Scientific FOCUS GC, Инструкция по эксплуатации

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Chapter 7
Column
Keeping Leaks Under Control
146 Instruction Manual
Keeping Leaks Under Control
FOCUS GC features a series of automatized operations that make easier the task
of keeping under control the tightness of your system.
The sequence Manual Check for Leaks - Column Evaluation - Automatic Leak
Check is the key for minimizing troubles related to leaks.
After you install a column you must perform a manual leak check and column
evaluation then you can use the automatic leak function at any time in the future to
check for leaks
Column Evaluation
Once the leak has been removed and the tightness of the system is reasonably
sure, you should perform the Column Evaluation automatic control and compare
the response with the K Factor values reported in
K Factor Tables . Refer to
Performing a Column Evaluation operating sequence.
If the value obtained does not agree with the one reported on the card, this means
that the leaks have not been repaired.
Performing the Column Evaluation is the necessary condition for the success of
any subsequent Automatic Leak Check.
Identifying and Removing Leaks
If the Automatic Leak Check (or any significant symptom) has notified a possible
leak in the system, you should:
• Check the whole system for leaks, from the carrier gas inlet to the detector.
• Check the accessible, critical connections (column to injector, column to
detector, split an purge valves, septum caps).
A possible leaks source may be the gas bottles/gas chromatograph connections.
Check these lines before the others, if specific symptoms indicate that the leak is
outside the gas chromatograph.
Refer to Performing an Automatic Leak Check