A Gas Exceeds Pressure Setpoint Or Flow - Agilent Technologies 7890 Series Troubleshooting Manual

A Gas Exceeds Pressure Setpoint or Flow

Agilent 7890 Series Troubleshooting
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
SS inlet liner.
• Verify the method pressure settings for the SS inlet are above
the minimum viable settings available on the GC. See
• 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
If using an FID or NPD:
• Check for a plugged jet. See
or "To Check for a Plugged NPD
Valves:
• Check for a misaligned rotor.
GC Not Ready Symptoms
or Selecting the correct
high flow gold seal.
"To Check for a Plugged FID
Jet".
Align the rotor.
4
Table 4.
Jet"
97