GC Not Ready Symptoms 4
Agilent 7890 Series Troubleshooting 99
Cannot Maintain a Pressure as Low as the Setpoint on a Split Inlet
If the GC cannot maintain a pressure as low as the setpoint,
check for the following:
• Consider using a liner designed for split analysis.
• Method pressure parameter (or resultant pressure from a
flow setting) is too low for the carrier gas type. See
Split/Splitless inlet split mode minimum operating pressures
or Multimode inlet split mode minimum operating pressures
and the table below.
• Check for a plugged liner.
• Check for contamination or restriction in the split vent line.
See:
• To Perform a SS Split Vent Restriction Test.
• To Check or Monitor Split Vent Line Backpressure
• To Run the Inlet Trap Check
• To Check a Split Vent Line for Contamination
• For the split/splitless inlet, replace gold seal..See To Replace
the Gold Seal on the Split/Splitless Inlet.
Tab le 5 Approximate minimum viable inlet pressures for inlet in split mode, in psi (split/splitless, multimode)
Split vent flow (mL/min)
50–100 100–200 200–400 400–600
Helium and hydrogen carrier gases
Split liners - 5183-4647, 19251-60540 2.5 3.5 4.5 6.0
Splitless liners - 5062-3587, 5181-8818 4.0 5.5 8.0 11.0
Nitrogen carrier gas
Split liners - 19251-60540, 5183-4647 3.0 4.0 — —
Splitless liners - 5062-3587, 5181-8818 4.0 6.0 — —
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