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Unbeatable Density & Viscosity Performance

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Density and Viscosity

Principles of Concentration Measurement

Density and viscosity meters provide critical process measurements of liquids and gases. These meters are based on a vibrating-element principle whereby vibration frequency is inversely proportional to fluid density, yet each has a unique design to optimize performance for the desired measurement. The viscosity meters build on the same vibrating-element principle while also measuring additional characteristics of the frequency signal.

How It Works


Density and viscosity meters are based on a vibrating-element principle whereby vibration frequency is inversely proportional to fluid density. The viscosity meters build on this operational principle, but also measure additional frequency characteristics to determine liquid viscosity. All density and viscosity meters utilize an internal temperature measurement to account for changes in metal stiffness resulting from temperature changes.

Density and Viscosity


Density and viscosity are valuable process variables that can be used to measure product quality, perform conversions between mass and volume, optimize efficiency, identify product interfaces and much more. These measurements are needed anywhere that fluid value, quality or composition is important. In short, density and viscosity measurements help identify a fluid, determine how much of it there is and whether its makeup and measurement is correct.



Density and viscosity meters are critical for any fluid or gas process involving custody transfer, interface detection, blending, separating, evaporating or product change. Whether measuring percent concentration of a caustic cleaning solution or a sugar-water mix (degrees brix), these meters help drive revenue by delivering improved consistency, reduced waste and customers’ perception of quality. Many processes utilize fluid density and viscosity measurements to improve productivity and throughput.

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