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9. If the 1/8-inch copper split vent tubing was
disconnected from the inlet, confirm that it
has been re-attached without leaks.
10. The EPC module can fail in a mode where the
inlet EPC valve does not open, causing this
symptom.
An electronic leak detector is very useful in
isolating large leaks. Order Agilent product
number 5182-9646 (120 volts) or 5182-9648
(220 volts).
Case 2: Actual inlet pressure increases
slowly and does not reach the setpoint
NOTE: Check all of the parameters from Case 1
before proceeding.
Released: April 2004
1. Set the inlet to be tested to the following
6850 Series Gas Chromatograph Service Procedures
configuration:
• Confirm that the installed column is con-
figured correctly to the capillary inlet
and that there is only one column config-
ured to the inlet
• Split mode
• Inlet pressure 25 psi
• Split flow 400 mL/min
• Confirm that the actual inlet pressure is
still lagging the setpoint
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