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.

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 8.1, 5.4, or 2.7 mL standard; 16.2 mL optional* 5.4 mL*
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, Nickel
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