• Dual Detector for Challenging GPC/SEC Applications
    COMBO-ONE Viscometer/DRI detector. (courtesy: Testa Analytical)
  • COMBO-ONE as part of a multi-detector GPC/SEC system.


Dual Detector for Challenging GPC/SEC Applications

Sep 07 2023

Testa Analytical's COMBO-ONE Viscometer/DRI detector redefines the benchmark for challenging GPC/SEC applications, particularly in the study of polymer structure and branching.

Viscometry detectors in GPC/SEC, using a configuration akin to a Wheatstone bridge with four matched capillary tubes, have been in use for many years. However, they suffer from operational and performance limitations.

Carlo Dessy, developer of the COMBO-ONE, said: “By eliminating the fundamental drawback of the traditional online viscometer design, the known ‘sample breakthrough’ after each measurement, our dual detector allows much more rapid sequencing of samples. The result of our design innovation is to increase the total daily throughput of a GPC/SEC System by a factor of two. An additional benefit of eliminating ‘sample breakthrough’ is a significant reduction of solvent required for each measurement and consequently the amount of waste produced.”

He added: “Another benefit of our COMBO-ONE detector is its high sensitivity and resolution. This is achieved as our differential refractometer is an integral part of the viscometer, therefore both concentration and viscosity are measured at the same time on the very same sample segment. When branching calculations and structure investigations are the goal of your GPC/SEC analysis, then resolution and sensitivity are the most important parameters users must optimise for useful results.”

The COMBO-ONE Viscometer/DRI detector from Testa Analytical is fully compatible with all modern GPC/SEC systems.

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