The BI-DNDC Refractometer with Batch or GPC/SEC Modes from Brookhaven Instruments

The BI-DNDC—a deflection-type refractometer from Brookhaven Instrument—has been designed for use in GPC/SEC or batch mode. The increment in specific refractive index, dn or dc, is established in batch mode.

This value is needed as a parameter in molecular weight measurements using light scattering. The dn/dc is already known in GPC/SEC mode and the instrument is utilized as a concentration detector for SEC or GPC applications.

All significant features can be programmed by users to obtain the highest flexibility. The BI-DNDC refractometer can be configured through the front panel controls and can be read through an external computer or the LED readout.

The BI-DNDC refractometer features a microprocessor, which makes it easy to handle all functions of the instrument. It also allows users to transfer refractive index and temperature data to a personal computer through a regular serial interface.

Most significantly, the BI-DNDC requires a warm-up time of just one hour, which is relatively less when compared to the other commercially available models.

Features at a Glance

  • Autozero
  • Sensitivity—2.5 x 109 ΔRIU
  • Rapid instrument warm-up in approximately 1 hour
  • Reference cell flush
  • DNDCW Windows™ software
  • Nine measurement ranges are available
  • Wavelength selection—470, 535, or 620 nm
  • Active temperature control to 80 °C

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