Multi-Angle Light Scattering Detector for the Measurement of Absolute Molecular Weight and Size


Wyatt's revolutionary DAWN HELEOS II Multi-Angle Light Scattering (MALS) Detector can incorporate both MALS and QELS (Quasi-Elastic Light Scattering) into a single unit. Offering more than twice the sensitivity of Wyatt’s highly successful DAWN EOS, the new HELEOS is the most sensitive on-line light scattering instrument in existence.

Wyatt’s DAWN HELEOS II is the only light scattering detector in the world capable of achieving a dynamic range of 126 dB, enabling the instrument to virtually never go off scale. This results in faster sample runs, offering a wider range of sample concentrations than ever previously attained. The instrument also utilizes a new 24 bit A/D measurement system, with separate A/Ds for each detector channel. This provides the same high sensitivity over the entire range of scattering intensities, rendering post-detector amplifiers unnecessary.

By utilizing the DAWN HELEOS II, the light scattering process is simplified, allowing the regulation of measurements to be completely automated. By incorporating an air cooled Peltier to temperature-regulate the sample, the process can operate at temperatures between 0ºC and 150ºC, thus achieving a stability that is greater than 0.01ºC. Furthermore, the HELEOS is able to operate on a corporate network due to its Ethernet interface, thus allowing the user to control or view the status of the instrument from multiple locations.

The DAWN HELEOS II can be incorporated seamlessly with all other Wyatt instruments, such as the ViscoStar differential bridge viscometer, via the network or USB interfaces. It has the capability of taking signals from a variety of third party instruments, such as UV absorption, DRI, IR absorption, evaporative light scattering or photodiode array detectors.

Wyatt Technology, the inventor of the world’s first MALS instrument has applied its 20 years of experience into the development and manufacturing of light scattering equipment, to further demonstrate its commitment to the field of absolute macromolecular characterization. The DAWN HELEOS II represents a new generation of light scattering instrumentation, providing absolute measurements for results of the highest accuracy for use in the biotechnology, chemical, petrochemical and pharmaceutical industries.

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