June 11, 2015, 715004754 Rev. A
Page 106
If your system is exhibiting symptoms not addressed in one of the following tables,
refer to “Troubleshooting” on page 104. If you need further help, contact Waters
Technical Service.
7.3.2.1 Abnormal baseline
Drift, noise, and cycling are common symptoms of an abnormal baseline.
Baseline drift – Can be flow-related or result from changing ambient conditions,
especially temperature. Determine if drift is flow related by shutting down the solvent
delivery system or pump.
Noise – If baseline noise is high, determine whether it is a short- or long-term
variation. You can eliminate many possible causes of baseline noise by identifying the
rate at which the baseline is changing and purging the flow cell with the proper
solvent.
Cycling – If the baseline is cycling, determine the period of the cycling and if it is
related to the flow rate or fluctuations in ambient temperature or pressure.
Use the following table to troubleshoot baseline problems.
Warning: To avoid the harmful effects of personal contact with
solvents, including inhalation, always wear chemical-resistant,
powder-free gloves and observe good laboratory practice when you
handle them. See the Material Safety Data sheets for the solvents
you use.
Warning: To avoid the harmful effects of personal contact with
leaking solvents, flush the detector with an appropriate miscible
solvent prior to installing or replacing fittings.
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