m-VROC II Viscometer

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m-VROC II is the next generation of leading semi-automated, small sample viscometer. Capable of the most demanding applications including small sample protein therapeutics, m-VROC II features the widest dynamic range (high shear rate viscosity measurements up to 2,020,000 s-1) with as little as 15 microliters of sample.

Understanding Fluid Behavior — Measuring Absolute Viscosity

With VROC® Technology, RheoSense took the standard principles of rheometry and created a dynamic micro-sample viscometer by adding microfluidics while reducing the size of the device with MEMS (micro-electrical mechanical systems) manufacturing. The result was a new platform which offers capabilities that are well beyond the limits of conventional viscometers in not only the sample volumes required, but the measurement range and precision.

VROC Viscometer Rheometer on a Chip

Scientific Principle

The measuring cell or “chip” contains a rectangular slit flow channel constructed of borosilicate glass, with a uniform cross-sectional area. The sample is injected at a constant flow rate though the flow channel where multiple pressure sensors mounted within the base monitor the pressure drop from the inlet to the outlet. The pressure drop is correlated with the shear-stress at the boundary wall. The shear rate and shear stress are directly related to the geometry of the rectangular slit and the flow rate which allow for viscosity measurements. 

Technical specifications
Minimum Sample Volume 15 µL
Shear Rate, s-1 0.86 ~ 2,020,000
Viscosity Range, mPa-s (cP) 0.4 ~ 200,000 cP
Temperature Range* 4~70 C
Accuracy 2% of Reading
Repeatability 0.5% of Reading
Temperature Sensor Built-In
Barcode Reader Function Included!
21CFR Part II Yes!
Non-Newtonian? Yes!
Temperature Sweep Yes!
Shear Rate Sweep Yes!
m-VROC II Viscometer  — Controlled Shear Rates and Small Samples

  • Bio-pharmaceutical & Protein Therapeutics
    • Bio-Fluid
    • Injectability
    • RNA Therapeutics
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