Preventive Maintenance and Troubleshooting
Chromatographic symptoms
128
Detector response has changed
Recalibrate the detector. Absolute response factors can change several
percentage points during the day depending on the type of detector in use.
Sample carryover
Figure 71. Blank run showing carryover peaks
Number or type of washes is insufficient
Check the run parameters for the number of sample and solvent washes. The
number of washes you need depends on your application. See “Controlling
sample carryover” on page 47.
You ran out of solvent
Check the solvent bottles. If the solvent level is below 2.5 ml, the syringe
cannot reach the solvent. Replace the remaining solvent with 4 to 4.5 ml of
fresh solvent. See “Filling and placing the bottles” on page 37.
Check the waste bottles. If the waste level is near the neck of the bottle,
replace it with an empty bottle.
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