A. All component peaks become smaller. Possible causes Suggested measures 1 Defective injection needle Use a new needle or a non-defective needle 2 Leak night after injection to determine the night leak, maintenance 3 MAE UP is too large: Split ratio is too large Adjust gas flow rate and split Ratio 4 The molecular weight of the analyzed substance is too large, and the INJ is increased when the bottom evaporates the sample. OVEN (the highest temperature of the main column makes the sample's vaporization temperature too low, or the column temperature is too low for use) 5 NPD is covered with contaminants (silica) to replace the bead
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