Viscometer eliminates need for off-site sample evaluation.

Press Release Summary:

Viscometer-on-a-Chip measures viscosity and temperature as test liquid flows through integrated micro-channel and micro slit rheometer. Non-Newtonian viscosity is extracted by 2D Rabinowitch correction, and measurement data is displayed and analyzed by microcontroller based read-out circuit. Shear rate ranges up to 106 (1/s) can be measured over 10-2-104 Poise. Chip can also be adjusted to read flow rates for samples with constant viscosity.

Original Press Release:

New Viscometer-on-a-Chip (VSS)

RheoSense, Inc. has introduced a line of NEW chip based viscosity measurement instruments for precise and repeatable characterization of various liquids.

These NEW Viscometers-on-a-Chip eliminate the need to send samples for accurate viscosity measurements to an off-site laboratory for batch-to-batch consistency checks.

Further, confusion in data interpretation encountered when comparing results from different viscosity measurement systems to laboratory instruments data is no longer a factor as the chip measures the "true viscosity" and user-friendliness eliminates operator dependent measurement errors.

The result is a significant reduction in hidden operation costs from improved efficiency in quality control and decision making.

The chip measures the viscosity and the temperature as the test liquid flows through a micro-channel on the chip and an integrated micro slit rheometer. Non-Newtonian viscosity is accurately extracted by a rigorous 2D "Rabinowitch correction", which is automatically performed after each measurement.

The chip then sends measurement data for data display and analysis to a microcontroller based read-out circuit, which communicates to a computer through RS232 or USB ports. The result is a measured material viscosity identical to that produced by sophisticated laboratory rheometers.

A precise liquid dispensing pump is supplied as an integral part of the system or if an accurate dispensing system is already in place, then all that is required is to simply integrate the chip into the flow path lines.

Wide shear rate ranges up to 106 (1/s) can be measured over a range from 10-2 ~104 Poise. Higher viscosity can be also measured with stiffer chips. Small sample volumes as low as 20 µl can be handled easily.

For applications where the viscosity of the test liquid is constant or varies slightly, the chip can be adjusted to read the flow rate (flow sensor) instead. If repeated quality control measurements are required, an application specific custom design is available.

To receive additional information on the NEW Viscometer-on-a-Chip
Web site:

Client Contact:
Dr. Seong-Gi Baek


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