GC Not Ready Symptoms 4
Agilent 7890 Series Troubleshooting 97
A Gas Exceeds Pressure Setpoint or Flow
If a gas exceeds its pressure or flow setpoint, do the following:
If using a split/splitless inlet, MMI inlet, PTV inlet, or volatiles
interface:
• Decrease the split ratio.
• Replace the split vent filter. See the procedure for the SS,
MMI, PTV, or VI.
• Check the split vent trap line for contamination or an
abnormal restriction. Run the split vent restriction test in
Agilent Instrument Utilities, if available, or from the GC front
panel. See:
• To Check or Monitor Split Vent Line Backpressure
• To Run the Inlet Trap Check
• To Check a Split Vent Line for Contamination
• Verify that the correct liner is selected (if liner is used). See
Selecting the correct MMI inlet liner or Selecting the correct
SS inlet liner.
• Verify the method pressure settings for the SS inlet are above
the minimum viable settings available on the GC. See Table 4.
• Check the gold seal for contamination (for split/splitless
inlet). See To Replace the Gold Seal on the Split/Splitless
Inlet.
• For a split/splitless inlet, if using a liner that causes a
restriction, install a high flow gold seal.
If using an FID or NPD:
• Check for a plugged jet. See “To Check for a Plugged FID Jet”
or “To Check for a Plugged NPD Jet”.
Valves:
• Check for a misaligned rotor. Align the rotor.
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