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Case 3: Chromatographic performance
problems suggest a possible leak
This section contains procedures for two differ-
ent inlet system leak tests.
Noninvasive leak check
The first leak test is performed without removing
the customer's column, septum or liner. It is
called the non-invasive leak check. This test does
not prove that the inlet is absolutely leak free,
but is a good first pass or remote diagnostic to
see if complete inlet pressure testing is needed.
Released: April 2004
1. Confirm that the installed column is config-
2. Put the inlet into splitless mode.
3. Set the purge flow to 50 mL/min; purge time
4. Set the column flow to 2 mL/min. The
6850 Series Gas Chromatograph Service Procedures
ured correctly to the capillary inlet.
to 1.0 minute.
system will try to establish the pneumatic
conditions shown in the following diagram.
The inlet pressure will be a function of the
column dimensions and oven temp. This
example shows 20 psi.
285
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