Agilent Technologies 7890A Troubleshooting Manual page 31

Peaks Not Displayed/No Peaks
Troubleshooting
• 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.
Chromatographic Symptoms
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