Agilent Technologies 7890A Troubleshooting Manual page 36

Gas chromatograph

Hide thumbs Also See for 7890A:

Chromatographic Symptoms

Sample Decomposition in Inlet/Missing Peaks

• Lower the inlet temperature.

• Check for air or water in the carrier gas; verify gas purity

and functionality of traps.

• Verify that the liner is appropriate for the sample being

run.

• Perform complete inlet maintenance: Replace all

consumable parts and bake out the inlet.

• Install a deactivated liner (SS, PP, MMI and PTV inlets).

• Check for leaks at the septum, liner, and column fittings.

(See "Checking for Leaks".)

• Install an Agilent Direct Connect liner.

• Use a pulsed pressure method for quicker sample transfer

to column.

• Bake out the inlet. See the following:

• To Bakeout Contaminants from the Split/Splitless Inlet

• To Bakeout Contaminants from the Multimode Inlet

• To Bakeout Contaminants from the Purged Packed Inlet

• To Bakeout Contaminants from the COC Inlet

• To Bakeout Contaminants from the PTV Inlet

• To Bakeout Contaminants from the VI Inlet

Troubleshooting