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Agilent Technologies 7890 Series - SplitSplitless inlet split mode minimum operating pressures

Agilent Technologies 7890 Series
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48 Agilent 7890 Series Troubleshooting
3 Chromatographic Symptoms
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”.)
Some samples change with heat or ultraviolet light. Check
sample stability.
Check the sample level in the vial.
If the sample is viscous, try the following:
Increase the viscosity delay time.
Dilute the sample in an appropriate low-viscosity solvent.
Turn the tower fan off.
For 7683B ALS, use the tray quadrants to warm the
sample. For 7693A ALS, use the vial heater (accessory
G4514A Bar Code Reader/Mixer/Heater) to warm the
sample vial.
If the problem is with the detector, see Table 3.

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