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Alliance iS HPLC Systems User Guide
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Alliance iS HPLC Systems User Guide
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System components

PDA detector features

PDA detector features
Topic LCI-USG-0222, Last Updated 11/07/2024

The detector operates as an integral part of a Waters chromatography system.

The Alliance iS photodiode array (PDA) detector is an optical detector capable of simultaneous 2D and 3D operation. The detector is controlled by Empower and offers an analytical flow cell with a volume of 8.4 µL and a path length of 10 mm.

The flow cell design reflects Waters TaperSlit technology.

The detector features:

  • Improved equilibration and warm-up time
  • Enhanced sensitivity using the patented TaperSlit flow cell, which channels light through the cell for better energy throughput
  • Actuator-controlled variable slit
  • Lamp, flow cell, and optical filter ID
  • Cuvette options
  • Precision grating alignment
  • Thermal isolation and control
  • Home position confirmation
  • Lamp optimization for the best performance over the lifetime of a deuterium lamp
  • Low baseline noise performance (<10 μAU)
  • Enhanced and new functionality to mitigate the effects of changes in ambient temperature (see the following capabilities table)
  • Flexible sampling rates from 1 to 160 Hz for normal and fast LC separations
  • Independent optimization of sampling rates and filter time constants gives you the ability to tune your detector to your separation goals
Table 1. PDA detector capabilities
Capability Description
Automatic, second-order filter Supports standard absorbance, UV/Vis functionality, and the spectrum scan feature
Full diagnostic capability Supports built-in diagnostic tools to optimize functionality and performance
Thermal wander management (enhanced) and active thermal control (new)

Reduces performance issues due to changes in ambient temperature

(See PDA detector thermal wander management and active thermal control.)

Cuvette qualification Facilitates qualification of the detector by insertion of a standard in a cuvette. This feature is supported by Waters qualification kits available for purchase (optional cuvette sold separately).
Cuvette sample analysis Allows recording of the spectrum of any sample placed in the cuvette
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