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Flow Meter Accuracy Comparison Chart: Vortex vs Coriolis vs Magnetic Measurement
Quick Answer
Quick Answer: Vortex flow meters deliver about ±0.75% to ±1.0% of reading for liquids and ±1.0% to ±1.5% for gas and steam. Coriolis mass flow meters reach ±0.1% to ±0.2% mass flow accuracy for both liquids and gases. Magnetic flow meters offer ±0.2% to ±0.5% for conductive liquids like water, wastewater, acids, and seawater. Pick vortex for steam and utility gas. Pick Coriolis for mass flow of high-value fluids. Pick magnetic for conductive liquid volume flow. Silver Automation Instruments supplies all three types with factory calibration and application support.
Accuracy Numbers That Matter in the Field
In practice, datasheet accuracy only matters when it matches your fluid and installation. We have seen this on customer sites many times. Here is the thing. A meter that passes a calibration rig can shift under a distorted flow profile. Use the comparison below as a starting point, not a final guarantee.
| Parameter | Vortex Flow Meter | Coriolis Mass Flow Meter | Magnetic Flow Meter |
|---|---|---|---|
| Liquid accuracy | ±0.75% to ±1.0% of reading | ±0.1% to ±0.2% of mass flow | ±0.2% to ±0.5% of reading |
| Gas and steam accuracy | ±1.0% to ±1.5% of reading | ±0.25% to ±0.5% of mass flow | Not suitable for gas |
| Fluid limit | Reynolds number above 20,000 typical | Almost any clean liquid or gas | Conductivity above 5 µS/cm |
| Multivariable output | Velocity, temperature and pressure compensation | Mass flow, density, temperature | Volume flow only |
| Typical use | Steam, compressed air, natural gas | Chemical feed, edible oil, LNG, syrup | Water, wastewater, acids, seawater, slurry |
Vortex Flow Meter Accuracy and Best Fits
A vortex flow meter uses a bluff body to shed vortices. The shedding frequency is proportional to flow velocity. For liquids, accuracy is usually ±0.75% to ±1.0% of reading. For gas and steam, reality is closer to ±1.0% to ±1.5% of reading. Most engineers skip this part. They apply the liquid accuracy number to steam service and then wonder why the boiler fuel total is off.
Vortex meters have no moving parts. They survive high temperature up to 250 °C or 350 °C depending on design. Use a vortex meter for saturated steam, superheated steam, compressed air, natural gas, and low-viscosity hydrocarbons. Avoid vortex meters for thick oils, slurries, or conductive water with bubbles. Low flow cut-off is a known limitation. Below the minimum Reynolds number, the vortex signal becomes unstable.
Silver Instruments vortex flow meter works from DN15 to DN300. It accepts a PT100 temperature input and 4-20 mA HART output. For steam mass flow, add pressure compensation and the transmitter computes mass flow in kg/h.
Coriolis Mass Flow Meter Accuracy and Best Fits
Coriolis meters measure mass flow directly. The meter vibrates one or two tubes. Fluid mass flow creates a phase shift. Accuracy can reach ±0.1% or ±0.2% for mass flow across a wide turndown. Density accuracy often sits at ±0.0005 g/cm³ to ±0.002 g/cm³. That mass flow plus density output makes the meter useful for both flow and quality checks.
We supplied a Coriolis mass flow meter to a paint manufacturer in Vietnam. The plant needed batch dosing of solvent and resin. Mass flow accuracy prevented overfeeding and reduced batch rejection by about 7 percent in the first quarter. That is not a lab number. That is a production result.
Use a Coriolis meter for edible oil, palm oil, molasses, syrup, LNG, LPG, chemical dosing, and reactor feed. Coriolis meters handle liquids and