Troubleshooting 10
Installation, Operation, and Maintenance 171
Part 3, Maintenance and Troubleshooting
Symptom: Smaller or Larger Peaks Than Expected
Figure 71 Smaller or larger peaks than expected
Table 2 8 Peak size problems
Possible cause Action
You are comparing a
chromatogram without needle
fractionation against one with
needle fractionation.
Check your injection mode. In the normal injection mode, the
sampler uses fast injection to deliver a representative amount
of the sample. Fast injection minimize needle fractionation.
Chromatograms from manual injection or slower auto
injection devices show higher levels of low molecular weight
materials versus higher molecular weight materials because
the volatiles boil out of the needle faster than the higher
weight materials.
Automated injection
Manual injection
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