Coriolis Flow Meter Selection

Coriolis meters measure mass flow directly by sensing the deflection of an oscillating tube, which makes them the reference choice where accuracy and mass accountability matter most. They work with almost any fluid but carry a cost and pressure-loss penalty that rules them out of some applications. This guide covers when to choose Coriolis, when not to, and the parameters that decide the model.

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Choose it when

Custody transfer and fiscal/allocation metering requiring ±0.1–0.2% accuracy
Direct mass flow or density measurement (no separate density input needed)
Non-conductive fluids — hydrocarbons, oils, solvents — that rule out electromagnetic
High-viscosity fluids (1,000+ cP) where turbine and vortex fail
High-value or hazardous fluids where measurement error is expensive

Avoid it when

Large pipe diameters (DN150+) where cost grows steeply
Tight budgets — capital cost is typically £3,000–£15,000+
Applications sensitive to permanent pressure loss (0.5–2 bar)
Low-pressure gas where the meter cannot develop a measurable signal
Persistent two-phase (gas/liquid) flow that disturbs tube oscillation

Key selection criteria

Accuracy classCustody transfer needs ±0.1–0.2%; process control rarely justifies the cost. Match the class to the financial impact of error, not the tightest available.

Mass vs. volumetricCoriolis reads mass directly, removing density/temperature compensation error — a key reason it wins for billing and recipe control.

ViscosityPerformance is largely viscosity-independent, a major advantage for heavy oils and polymers.

Pipe size & costCost rises sharply with diameter; downsizing the meter with a reducer often improves both cost and turndown accuracy.

Pressure lossThe bent-tube design adds permanent loss — factor pump energy into the 10-year total cost of ownership.

Two-phase toleranceEntrained gas degrades accuracy; confirm the process stays single-phase at the meter.

Typical applications

North Sea crude oil export and fiscal metering
Chemical and pharmaceutical ingredient charging by mass
High-viscosity oils, polymers and additives
Cryogenic liquids (LNG, liquid nitrogen)
Custody transfer of high-value non-conductive fluids

Limitations to check before specifying

Capital cost is the highest of the common technologies, especially above DN100
Permanent pressure loss raises long-term pumping energy cost
Entrained gas or flashing fluids reduce accuracy
Heavy meter bodies can need additional pipe support on larger sizes

Manufacturers compared

InstruSelect compares published specifications across manufacturers including Emerson (Micro Motion), Endress+Hauser (Promass), Yokogawa (ROTAMASS), Krohne, Siemens. Selection is on engineering fit, not brand; mention of a manufacturer is factual reference, not endorsement.

Frequently asked questions

Why are Coriolis meters more accurate than other types?

They measure mass flow directly from tube deflection rather than inferring flow from velocity or pressure, so they avoid the density and profile errors that limit volumetric meters — typically reaching ±0.1–0.2% for liquids.

Can a Coriolis meter handle gas?

Yes for dense or high-pressure gas, but low-pressure gas may not generate enough signal, and two-phase gas/liquid flow degrades accuracy. Confirm the operating pressure and phase before specifying.

When should I not use a Coriolis meter?

When the pipe is large (cost), the budget is tight, permanent pressure loss is unacceptable, or the fluid is conductive water/wastewater where an electromagnetic meter does the job for far less.

Compare this against other technologies

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