New ViscoDense: Single In-line Sensor for Viscosity, Density, and Temperature that is Rugged, Self-cleaning, Maintenance-free

Cambridge Viscosity Announces ViscoDense

The new ViscoDense® is a breakthrough 3-in-1 instrument providing instantaneous in-line measurement of viscosity, density, and temperature in one single device. This device capitalizes on Cambridge’s patented driven-piston technology for measuring as well as keeping the sensor clean and coating-free, virtually eliminating the need to re-calibrate the sensor in normal in-process use. Cambridge’s ViscoDense capability is available in a variety of small, rugged sensor configurations to meet a wide variety of in-process needs. Each measurement is traceable to NIST and avoids the pitfalls of inferred values or the insertion of multiple probes.

Petrobras Field Trials

Field trials at Petrobras in Brazil tracked kinematic viscosity (the combined measure of absolute viscosity and density) with temperature. Results were impressive: for the first time the company could easily see what was happening in their process.

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Typical results from the Petrobras field tests are shown above comparing ViscoDense tracking with their standard laboratory instrument measurements.

The Technology

Cambridge Viscosity’s piston-style viscosity and density technology uses a pair of magnetic coils within a 316 stainless steel sensor. Two coils inside the sensor body magnetically force the piston back and forth a predetermined distance in the measurement chamber. Powering the coils provides a constant force on the piston to measure viscosity and density, and keep the chamber clean.

cutaway drawing of sensorThe sensor measures the piston’s travel time in each direction. As the viscosity increases, the two way travel time decreases. This is the basic viscosity measurement principle. The density measurement utilizes Archimedes’ concepts for density sensing within Cambridge’s driven piston approach. We use a hollow, buoyant piston and measure the travel time in each direction. The time difference yields a direct, real-time density value. As the density of the fluid changes, the buoyancy of the piston also changes, giving a difference in the travel times. This approach is covered under separate patents granted to Cambridge Viscosity.

The density measurement is calibrated to +/- 0.01 g/mL with NIST-traceable fluids of .85 g/mL. This yields an accuracy of +/-0.02 g/mL within the 0.6-1.1 g/mL range. Since this technique is incorporated into the sensor, no additional instrumentation is needed in the process line.

Markets where there are clear advantages include:

  • Production
  • Refining
  • Processing
  • Transport
  • Blending
  • Combustion

In addition, ViscoDense should be considered for any application which could benefit from automating gravity-based measuring devices.

For More Information

For more information about ViscoDense, email or call 781 393-6500.