Viscometers

ViscoStar™

ViscoStar: The next generation online differential viscometer.

A highly sensitive, on-line differential viscometer used in conjunction with SEC-MALS-IV to determine the size and conformation of all types of biopolymers, synthetic polymers and even proteins and peptides.

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microViscoStar™

microViscoStar: Online differential viscometer for UHPLC.

The microViscoStar incorporates multiple novel technologies to provide the highest sensitivity, stability and solvent compatibility of any available viscometer for UHPLC. Its ease-of-use and serviceability make it the perfect companion for Wyatt's microDAWN™ light scattering and microOptilab™ refractive index detectors for UHPLC.

microViscoStar

Viscometer System Comparison

Capabilities ViscoStar™ microViscoStar™
Differential Viscosity
Sensitivity (minimum detectable sample)
    100 ng of 100 kDa polystyrene in THF at 1 mL/min, under typical GPC conditions
    5 ng of 100 kDa polystyrene in THF at 1 mL/min, under typical UHPLC conditions
Differential pressure noise < 0.05 Pa < 0.05 Pa
Differential pressure range 6.9 kPa, protected against overpressure 6.9 kPa, protected against overpressure
Dynamic range 135,000:1 135,000:1
Linearity 0.5% of full scale 0.5% of full scale
Differential pressure drift < 2.5 Pa/hr < 1.25 Pa/hr
Capillary bridge autobalance Thermal, leak-free mechanism Thermal, leak-free mechanism
Sample shear rate 5000 Hz with water @ 1 mL/min 15000 Hz with water @ 1 mL/min
Fluidics
Max. flow rate Aqueous: 1.5 mL/min; THF: 3 mL/min Aqueous: 1 mL/min; THF: 1 mL/min
Delay volume options 16.2, 10.8 or 5.4 mL, with additional factory-installed option for 32.4 mL1 5.4 mL2
Max. permissible pressure inlet to outlet 690 kPa 3000 kPa
Wetted Materials 316 stainless steel, PTFE, zirconium silicate, Kalrez®, Inconel, 26-1 Stainless Steel 316 stainless steel, PTFE, zirconium silicate, Kalrez®, Inconel, 26-1 Stainless Steel, Nickel3
Temperature Control
Range 4 °C to 70 °C 4 °C to 70 °C
Stability <0.005 °C <0.005 °C
Ambient Range 0 °C to 40 °C, 20% to 70% RH 0 °C to 40 °C, 20% to 70% RH

1 Volume of fluid through the ViscoStar until the retained sample elutes. Actual volume of fluid in the column is half this value.

2 Addition of an inline UV detector may impose a lower maximum flow rate.

3 Due to the location of the wetted materials on the microViscoStar detector, it is suspectable to corrosion when using buffers with high ionic strength. It is primarily recommended for use with organic solvents.

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