172 Agilent 1260 Infinity DAD and MWD User Manual
9 Test Functions
Intensity Test
In case of low counts in one or more ranges, start the testing with the
comparison of values with flow cell vs. flow cell removed.
Contaminations of the cell windows and/or the lenses (there are 3 between
vis-lamp and flow cell), will reduce the light throughput.
If the detector fails in the range 501 nm - 950 nm, check
• is the VIS-lamp ON? If not, turn it on.
• is VIS-lamp glass bulb blackended or broken? If yes, replace VIS-lamp.
• does the UV-lamp show a reflective coating towards the VIS-lamp? If yes,
replace UV-lamp.
Example (measured without flow cell):
Test Failed
VIS-LAMP OFF or defect: 110 counts
VIS-LAMP ON and OK: 13613 counts
Probable cause Suggested actions
1 Absorbing solvent or air bubble in flow cell.
Ensure the flow cell is filled with water, and free
from air bubbles.
2 Dirty or contaminated flow cell.
Run the cell test (see “Cell Test” on page 179). If
the test fails, exchange the flow cell windows.
3 Dirty or contaminated optical components
(achromat, windows).
Clean optical components with alcohol and
lint-free cloth or replace the parts.
4 Old or non-Agilent lamp.
Exchange the lamp.
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