Viscotek HT-GPC Light Scattering

Overview

The HT-GPC Light Scattering system comes with a high temperature RI, for use as a concentration detector, and dual Light Scattering detectors (LALS and RALS) for absolute molecular weight determination.

It also features a temperature controlled column chamber and automated filtering of the sample at high temperature, to ensure safe handling.

• Dual piston optimized for HT-GPC, with extremely low pulsation and stable eluent flow to improve detector performance.
• Temperature controlled environment for up to 7 columns, injector and up to three detectors.
• Automated sample preparation using the Vortex autoprep/autosampler. Operates up to 160°C with no user intervention, making the system safe, accurate and productive.
• Automated sample filtration reduces the number of preparation steps – only the sample injected on the column is filtered, which avoids bulk filtration and improves lab safety (no manual handling of hot solvents).
• Unique 7° Low Angle (LALS) detector measures the absolute MW directly without data fitting, extrapolation or correction.
• 90° Right Angle (RALS) detector provides the best signal to noise ratio and the highest sensitivity for small molecules.
• Accurate measurement of the polymer concentration using a refractive index detector.

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How it works

The HT-GPC pump passes mobile phase through the GPC/SEC chromatography columns, following by the injector. The columns are maintained at the same temperature as the injector and detectors. After eluting from the column, the dissolved polymer molecules, now separated by size, enter the light scattering and RI detectors. Light scattering detection is used to determine the absolute molecular weight of dissolve particles, and refractive index detection is used to measure sample concentration.

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Specification

Component:

Oven/Detector module

Temperature Control:

30°C to 160°C all detector cells and columns.

Column Capacity:

Up to 7 standard 30cm GPC/SEC columns.

Interface:

6 channel digital interface to OmniSEC software.

Inputs:

2 analog inputs for auxiliary detectors.

Component:

Vortex Autosampler

Capacity:

30 vials, 40mL, (20mL option).

Temperature Range:

30°C to 160°C.

Stirring Speed:

Variable, 0 – 300 rpm.

Sample Filtration:

Automatic self-cleaning in-line sample filtration.

Sample Preparation:

Optional semi-automated sample preparation.

Component:

Degasser

Channels/volume:

Two channels, 8mL per channel.

Performance:

<0.5ppm oxygen at 0.5mL/min.

Component:

Pump

Flow rate range:

0.01 to 9.99mL/min.

Pulsation:

Less than 1% (measured with viscometer).

Pressure Reading:

MPa or PSI.

Soft start/stop:

User programmable in mL/min/min.

Detector 1:

Light scattering detector.

Measurement principle:

RALS, 90° angle; LALS, 7° angle, with high efficiency optics.

Light source:

Temperature controlled laser diode, 10mW, 660nm.

Cell:

18µL.

Purging:

3 modes, manual, automatic and programmable.

Data rate:

100Hz collection, DSP with 5Hz to OmniSEC.

Detector 2:

Differential refractive index detector.

Measurement principle:

Deflection.

Light source:

LED, 660nm.

Cell:

45° quartz glass, 12µL volume.

Purging:

3 modes, manual, automatic and programmable.

Data rate:

100Hz collection, DSP with 5Hz to OmniSEC.

Measurement type 1:

Absolute Molecular Weight

Measurement principle:

ight scattering (LALS or RALS).

Measurement type 2:

Concentration

Measurement principle:

Differential Refractive Index detection.

Operating environment:

Temperature:

15°C – 40°C.

Humidity:

35% - 80% non-condensing.

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