Waters 2998, Overview And Maintenance Manual

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December 5, 2017, 715004753 Rev. B
Page ix
General Information ............................................................................................... iii
Copyright notice ......................................................................................................................... iii
Trademarks ................................................................................................................................ iii
Customer comments .................................................................................................................. iii
Contacting Waters ..................................................................................................................... iv
Safety considerations ................................................................................................................ iv
Safety hazard symbol notice........................................................................................ iv
Considerations specific to the 2998 Photodiode Array Detector ................................. iv
FCC radiation emissions notice .................................................................................... v
Electrical power safety notice ....................................................................................... v
Equipment misuse notice.............................................................................................. v
Safety advisories .......................................................................................................... v
Operating this instrument ............................................................................................................ v
Applicable symbols ....................................................................................................... v
Audience and purpose................................................................................................. vi
Intended use of the 2998 Photodiode Array Detector.................................................. vi
Calibrating.................................................................................................................... vi
Quality control.............................................................................................................. vi
EMC considerations .................................................................................................................. vii
Canada spectrum management emissions notice...................................................... vii
ISM Classification: ISM Group 1 Class B ................................................................... vii
EC authorized representative ................................................................................................... vii
1 2998 PDA Detector Optics Principles ................................................................. 15
1.1 Detector optics .......................................................................................................................... 15
1.1.1 Calculating absorbance ................................................................................................. 16
1.2 Flow cell operating principles .................................................................................................... 17
1.3 Resolving spectral data ............................................................................................................. 18
1.4 Measuring light at the photodiode array .................................................................................... 18
1.4.1 Optimizing the signal-to-noise ratio ............................................................................... 19
1.4.2 Selecting the appropriate sampling rate ........................................................................ 19
1.4.3 Filtering data .................................................................................................................. 20
1.5 Computing absorbance data points ........................................................................................... 22
1.5.1 Dark current ................................................................................................................... 23
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