Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 278
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.
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
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
2. The carrier gas supply module is free of leaks
and restrictions to gas flow.
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