
Run and evaluate the test
Follow the instructions described in Section 6.1 General performance test actions, on page 226 to start,
run and automatically evaluate the performance test.
Illustration of chromatogram
The illustration below shows a chromatogram from a System test with UV monitor U9-L.
Possible causes of a failed test
The following tables describe possible causes of a failed test. When possible sources of error have
been checked and corrected, repeat the test.
Faulty Gradient Test Result
Action
Cause
Make sure to prime the buffer inlets and to purge the System pumps
before method start. See Section 5.4.1 System pumps, on page 162.
Disturbances caused by air
trapped in any of the pumps
Replace piston seals. See Chapter 7 Maintenance, on page 252.
Disturbances caused by
damaged pump piston seals
See Section 8.3 Troubleshooting: Monitors, on page 360.
Unstable or incorrect UV sig-
nal, or drifting base line:
• Faulty UV monitor
Replace the Mixer. See Chapter 7 Maintenance, on page 252.
Wrong Mixer chamber size
or faulty Mixer
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6 Performance tests
6.9 System Test UV U9-L (fixed)
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