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.
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
|Sensitivity (minimum detectable sample)||
|Differential pressure noise||< 0.05 Pa||< 0.05 Pa|
|Differential pressure range||6.9 kPa, protected against overpressure||6.9 kPa, protected against overpressure|
|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|
|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, Nickel|
|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.