Coriolis meters, often called ‘mass’ flow meters, have significantly increased their market share over the past 20 years. Their design has been refined, evolving into a highly accurate and versatile flowmeter.
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Primarily measuring mass flow with accuracy unaffected by changes in fluid density, they offer a typical measurement accuracy of 0.1% of reading over a 20:1 turndown. Our Coriolis mass flowmeters come with MID (Custody Transfer) Approval and ATEX Hazardous Area Approvals. With the correct tube material selection, the flowmeter can operate at elevated temperatures above 200 degrees C.
Coriolis meters can also measure volumetrically (l/min, m3/hr, etc.). Some users choose this type of flowmeter for volumetric flows when the liquid is non-conductive. For example, tankers are generally filled volumetrically to avoid over-filling and spillages. Once filled, the tanker is weighed on the weighbridge to determine the actual mass of the load.
This type of flow meter offers no obstruction to flow, although the shape of the measuring tubes may create a small pressure loss. Straight tube Coriolis flow meters can be used where pressure drop is an issue, such as with high viscosity fluids. Bi-directional flow applications can also be handled with this type of flowmeter.
A wide selection of tube materials allows the meter to handle ‘difficult’ liquids. It is available with many process connection options required by specific industrial markets. Typical line sizes range from a few millimeters up to 10” (300mm). Turbine flow meters are also commonly used for measuring liquids.
As density and viscosity of all gases are greatly affected by changes in temperature and pressure, this meter is ideal for gas measurement. It provides a true and accurate mass reading regardless of changes in gas characteristics.
Improving price competitiveness over the years means Coriolis meters can now compete with more traditional flow technologies, such as positive displacement flowmeters. With their very low cost of ownership (virtually maintenance-free), Coriolis meters can often be the best economical, long-term flow solution.
Coriolis mass flow meters offer a variety of signal outputs in addition to the standard 4-20mA for mass or volume flow. HART and PROFIBUS, as well as pulse/frequency outputs, are common requirements. Additionally, analogue signals for temperature and density can also be provided.
A Coriolis flow meter measures mass flow directly by detecting the Coriolis effect on vibrating tubes through which the fluid passes. The twisting motion caused by fluid flow is proportional to the mass flow rate.
They can measure liquids, gases, and slurries, including viscous fluids and those with entrained solids.
Direct mass flow measurement (no need for density compensation)
High accuracy (typically ±0.1% or better)
Ability to measure density and temperature simultaneously
No moving parts → low maintenance
Higher initial cost compared to other flow meters
Sensitive to vibration and installation conditions
Pressure drop can be significant for large sizes
Limited in very large pipe diameters (usually up to 12 inches)
No, unlike many other flow meters, Coriolis meters do not require long straight runs before or after the meter.
Typically ±0.1% to ±0.2% of rate for liquids and ±0.5% for gases, depending on the model and application.
For a quote and technical support on our Coriolis flow meters, click here to complete our quick online enquiry form, or call us at 01422 829920.
Should you wish to hire a meter, this can be done through our sister company Flowhire. https://www.flowhire.co.uk/flowmetertypes/coriolis-flow-meters/
