Agilent Technologies 8860 User Manual page 50

6 Maintenance and Troubleshooting
Chromatographic symptoms
4 Connect a N
Peaks not displayed/No peaks
• Ensure sample cylinder has sample and/or the sample pressure is high enough.
It is strongly recommended that the sample is pressurized to at least 1380 kPa above the vapor
NOTE
pressure of the mixtures at all times.
• Check that the Gasifier 2P3W valve is in the right position.
• Check that the Gasifier flow adjusting needle valve is not totally closed. If there is no flow when
sample pressure is high enough and needle valve is not closed, check for Gasifier blockage.
(See
• Ensure GC functions normally:
• Check that the GC gas sampling valve connected to Gasifier functions correctly.
• Verify the GC detector in use is assigned to a signal.
• Check the GC column for proper installation.
• Ensure that the GC column is not plugged. (Refer to the Troubleshooting section of the
• Check that the GC detector functions normally. (Refer to the Troubleshooting section of
• Check for Gasifier leaks. (See
Low Peak Area or Height (Low Sensitivity)
• Ensure sample cylinder has sample and/or the sample pressure is high enough.
50
or Air source less than 14 psi to the vent port to backflush the system. Purge
2
the system for at least 10 minutes. Increase the purge time if needed.
"Checking for Blockage"
GC user manual.) Perform column maintenance.
the GC user manual.)
on page 54.)
"Checking for Leaks" on page 53.)
Agilent 8860, 8890, and 990 Micro GC Gasifier User Manual