Thermo Scientific Surveyor UV Plus, Руководство по оборудованию

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4
Troubleshooting
Detector-Related Problems
46 Surveyor UV/Vis Plus Detector Hardware Manual Thermo Scientific
Random noisy
baseline Contaminated flow cell Flush the flow cell with cleaning solvents. See “Cleaning the
Flow Cells” on page 35 . Check for leaks.
Leak in sample inlet line Check all of the fittings for leaks, from the column outlet to
the flow cell inlet.
Bubble trapped in flow cell Increase the flow rate until the bubble is removed. Connect a
backpressure device to the flow cell (check pressure rating to
avoid rupturing the flow cell).
Leaking flow cell Replace the flow cell.
Insufficient lamp warm-up Allow a 30 minute warm-up for normal operation and a
1.5 hour warm-up for maximum sensitivity.
Aging or defective lamp Replace the lamp.
Ground loop problem between
integrator and detector Check the cable connections to the detector output; do not
ground at both ends of the cable.
Dirty flow cell or lamps Clean the dirty component. See “Cleaning the Flow Cells” on
page 35 .
Integrator input and output
voltage not matching Verify that the integrator is connected to the appropriate
analog output connections on the back panel of the detector.
See
“Connecting the Analog Outputs” on page 20 .
Check the attenuation setting on the integrator.
Excessive baseline
drift Contaminated flow cell Flush the flow cell with cleaning solvents. See “Cleaning the
Flow Cells” on page 35 . Check for leaks.
Mobile phase contamination Replace the mobile phase with fresh mobile phase that is
made with high-purity solvents.
Material bleeding from column Clean or replace the column.
Leaks in system or flow cell Check all of the fittings for leaks. Replace the flow cell.
Tiny bubble trapped in the
flow cell Increase the flow rate until the bubble is removed. Connect a
backpressure device to the flow cell outlet (check backpressure
rating to avoid rupturing flow cell).
Excessive temperature
fluctuations Remove the system from drafts. Thermostatically control the
column temperature.
Table 7. Detector-related problems (Sheet 2 of 3)
Symptom Cause Remedy