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Procedures
The procedures in this section address three
classes of capillary inlet leak problems:
1. The inlet will not pressurize at all. Actual
pressure stays at 0 psi after a pressure
setpoint has been entered. This is usually
due to a large leak.
2. The inlet pressure rises very slowly and does
not reach the setpoint pressure This is usu-
ally a moderate leak.
3. The inlet pressure control appears to be
functional, however due to chromatographic
symptoms or reproducibility problems a small
inlet leak is suspected.
Released: April 2004
Case 1: Actual inlet pressure stays at 0 psi
If the inlet pressure does not increase at all
check the following:
1. The designated supply pressure is sufficient
2. The carrier gas supply module is free of leaks
6850 Series Gas Chromatograph Service Procedures
for the customer application:
• 20 psi > maximum inlet pressure of the
method
• Typically 80 to 120 psi for 100 psi
modules and 120 to 170 psi for 150 psi
modules
and restrictions to gas flow.
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