Agilent Technologies 7890A - 3 Running a Method or a Sequence from the Keypad; Loading, Storing, and Running Methods from the Keypad; Loading, Storing, and Running Sequences from the Keypad

Chromatographic Symptoms 3
Troubleshooting 31
Peaks Not Displayed/No Peaks
• If using an autosampler:
• Ensure that there is sample in the vial.
• Verify that the ALS plunger carriage is secured to the
syringe plunger.
• Check that the syringe is installed correctly and draws
sample.
• Verify that the turret/tray is loaded correctly and
injections are not from out- of- sequence vials.
• Watch to see that the sample is pulled into the syringe.
• Verify the detector in use is assigned to a signal.
• Check the column for proper installation.
• Ensure that the column is not plugged. (See “To Measure
a Column Flow”.) Perform column maintenance.
• Check for leaks. (See “Checking for Leaks”.)
• Check the flow settings, then measure the actual detector
flows. (See “To Measure a Detector Flow”.)
If the problem is with the detector, see Table 1.
Table 1 Detector troubleshooting
Detector Solution
FID, FPD
• Verify that the electrometer is turned on.
• Verify that the flame is still lit.
TCD
• Verify that the filament is turned on.
• Ensure that the reference gas is not set to zero.