m-VROC II Viscometer (15 µL)

The m-VROC II is the next generation of leading automated microfluidic 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.

The second generation m-VROC also measures viscosity with the highest accuracy (2% of reading) and repeatability (0.5% of reading), but is now equipped with sample retrieval and recovery. Sample retrieval refers to the reversal of flow to refill the test syringe with a portion of the loaded volume. The retrieval process allows for more extensive testing on a single loaded sample volume which can include multiple repeats, shear rates, and temperatures. Sample recovery involves a final retrieval of the entire volume back into the test syringe so that the sample can be retained for further testing. 

m-VROC II measures the shear rate range of 0.86 to 2,020,000 s-1 and viscosity range of 0.4 to 200,000 cP across a wide temperature range (4 – 70°C). It provides viscosity characterization of both Newtonian and non-Newtonian samples.

The measuring cell 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.

Unlike the previous model, the m-VROC II does not require any external temperature control device, since the temperature is controlled in the cell block and chip using a Peltier thermal regulator. The instrument also is supplied with a chip cleaning station, so you can clean the chips quite fast and easy.

The m-VROC II comes equipped with an intuitive software, allowing users to easily save and load protocols, perform shear rate and temperature sweeps, export data into PDF/Excel, and apply non-Newtonian corrections with the push of a button. This software is also 21 CFR part 11 compliant, providing multi-level user access (standard user, IT admin, super admin etc.) and ensuring data integrity, preventing users from potentially manipulating your data.

• Accuracy: 2% of Reading
• Repeatability: 0.5% of Reading
• Viscosity Range: 0.4 – 200,000 mPa-s (or cP)
• Shear Rate Range: 0.86 – 2,020,000 s ^-1
• Small Sample Volume: 15 µL 
• Sample Recovery and Retrieval