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BI-DNDC – Refractive Index Increment Analyzer

BI-DNDC – Refractive Index Increment Analyzer

The BI-DNDC is a deflection-type refractometer that may be purchased for use in either batch or GPC/SEC mode. In batch mode, the specific refractive index increment, dn/dc, is d...

品牌: Brookhaven Instruments价格: 面议服务区域: 全国

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BI-DNDC – Refractive Index Increment Analyzer
说明规格FAQ

说明

The BI-DNDC is a deflection-type refractometer that may be purchased for use in either batch or GPC/SEC mode. In batch mode, the specific refractive index increment, dn/dc, is determined. This value is required as a parameter in molecular weight measurements using light scattering. In GPC/SEC mode, dn/dc is already known, and the instrument is used as a concentration detector for GPC/SEC applications.

The BI-DNDC can be set using the front panel controls and read using the LED readout or by an external computer. It includes a microprocessor, which allows user-friendly handling of all functions of the instrument, as well as refractive index and temperature data transfer to a personal computer via a standard serial interface.

Most importantly, the warm-up time for the BI-DNDC is only one hour, much less than other models on the market.

The dn/dc determination requires calibration of the batch mode instrument with a solvent/solute combination with known dn/dc, typically KCl in water. The calculated constant is not solvent-dependent and may be used for all further measurements. In batch mode, the instrument comes with BI-DNDCW software for use with an external PC. Included with the BI-DNDC instrument is a syringe kit with PEEK™ and Teflon ® tubing, fittings, and syringes.

The sample may be recovered and reconstituted if required. Typically, five or more concentrations, ranging from 0.1 to 10 mg/mL, are recommended. New instrument readings can be performed in a matter of minutes since it only takes ~ 0.5 mL of liquid to flush out the previous sample.

规格

Cell Angle45°
Cell Volume (Batch Mode)8 µL
Dead Volume (Inlet to Cell/Cell to Outlet)GPC Mode Sample Cell: 0.25 µL, GPC Mode Reference Cell: 100 µL
Batch Mode Sample Cell100 µL: Batch Mode Reference Cell: 8 µL
Measurement Ranges (ΔRIU Full Scale)(GPC mode)6×10 -4 , 3×10 -4 , 1.5×10 -4 , 7.5×10 -5 , 3.75×10 -5 , 1.87×10 -5 , 9.3×10 -6 , 4.6×10 -6 , 2.3×10 -6
n o Range1.0 to 1.75 RIU
Sensitivity (GPC Mode)

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1.5 ng (Fructose in H 2 O)
Noise Level< 2.5×10 -9 , 25 °C
Temperature Accuracy± 0.5 °C
Temperature Stability± 0.01 °C
温度范围Ambient to 80 °C
Specify Wavelength620 nm, 535 nm or 470 nm, factory set
Tubing I.D.: GPC Mode Sample Cell0.25 mm, GPC Mode reference cell: 0.5 mm; Batch Mode sample cell: 0.5 mm
Batch Mode Reference Cell0.5 mm
Flow Rate (typical/maximum)1.0/3.0 mL/min (Analytical Mode), 5.0/12.0 mL/min (Preparation Mode)
Time Constant0.1 to 2 seconds

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