Agilent Technologies 7890 Series - Peak Areas Not Repeatable

Chromatographic Symptoms 3
Agilent 7890 Series Troubleshooting 43
Peak Areas Not Repeatable
Check the ALS syringe operation. (See the Troubleshooting
section of the sampler user manual: 7693A, 7650A, 7683B.)
• Replace the syringe.
• Check for leaks in the inlet, liner (as applicable), and column
connection. (See “Checking for Leaks”.)
• Check sample level in vials.
• Run replicates of known standards to verify the problem.
• Consider if this is the first run. (Has the GC stabilized?)
For a multimode or split/splitless inlet in split mode, also check
for:
• An abnormal split vent restriction. See:
• To Run the Inlet Trap Check
• To Perform a SS Split Vent Restriction Test.
• To troubleshoot small leaks in a multimode or split/splitless
inlet, see To Check for Leaks in a Split/Splitless Inlet or To
Check for Leaks in a Multimode Inlet.