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Coriolis mass flowmeters

Coriolis flow measurement: Simultaneous measurement of mass flow, density, temperature and viscosity

The Coriolis measuring principle is used in a wide range of different branches of industry, such as the life sciences, chemicals, petrochemicals, oil and gas, food, and – no less importantly – in custody transfer applications. Coriolis flowmeters can measure virtually all fluids: cleaning agents, solvents, fuels, crude oil, vegetable oils, animal fats, latex, silicon oils, alcohol, fruit solutions, toothpaste, vinegar, ketchup, mayonnaise, gases or liquefied gases. Simultaneous measurement of mass flow, density and temperature opens up entirely new perspectives for process control, quality assurance and plant safety.

Additional important characteristic values can also be calculated from the primary variables measured:

  • Volume flow
  • Solids content in a fluid
  • Concentrations in multiple-phase fluids
  • Special density values such as reference density, °Brix, °Baumé, °API, °Balling, °Plato, etc.

Coriolis flow measuring principle

Each Coriolis flowmeter has one or more measuring tubes which an exciter causes to oscillate artificially. As soon as the fluid starts to flow in the measuring tube, additional twisting is imposed on this oscillation due to the fluid‘s inertia. Two sensors detect this change of the tube oscillation in time and space as the “phase difference.” This difference is a direct measure of the mass flow.

In addition, the fluid density can also be determined from the oscillation frequency of the measuring tubes. The temperature of the measuring tube is also registered to compensate thermal influences. The process temperature derived from this is available as an additional output signal.

Benefits

  • Universal measuring principle for liquids and gases
  • Multivariable measurement – simultaneous measuring of mass flow, density, temperature and viscosity
  • High measuring accuracy: typically ±0.1% o.r., optionally: ±0.05% o.r. (PremiumCal)
  • Measuring principle independent of the physical fluid properties and the flow profile
  • No inlet/outlet runs necessary

Proline Promass Q for challenging applications

Coriolis flowmeter with superior accuracy for flow and density measurement

Whether in custody transfer applications or when meeting stringent product quality requirements – superior measuring accuracy is essential. Historically, high accuracy levels were only achievable under ideal circumstances, meaning stable process conditions and true single-phase homogeneous fluids. In the real world, however, these ideal conditions don’t often exist. The Promass Q Coriolis flowmeter has been developed exactly for such applications in the oil & gas as well as in the food industry.

Benefits

  • Exceptional density measurement performance.
  • Widest useable flow range on the market.
  • Excellent performance for liquids containing suspended bubbles or microbubbles thanks to the patented Multi-Frequency Technology.
  • Superior repeatability, e.g. for custody transfer and meter proving.Lowest sensitivity to changing process pressure/temperature on the market.
  • Smaller and lighter than competing devices.

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