Vortex Flowmeters

Vortex Flowmeters

Vortex flowmeters measure the volume flow of liquids, gases, and steam by detecting vortex shedding downstream of a bluff body in the flow path. As flow velocity increases beyond a threshold, alternating vortices form and detach at a frequency proportional to mean velocity. A sensor converts the resulting pressure fluctuations into a stable, linear signal that can be used to calculate volumetric flow.

Vortex technology is broadly applicable and is largely unaffected by changes in pressure, density, temperature, and viscosity within its operating range. With no moving parts and a lifetime K-factor approach, vortex meters offer strong long-term stability with minimal zero-point drift. Typical turndown ratios support wide operating windows, enabling one device to cover both normal and peak load conditions.

Modern multivariable vortex meters extend beyond volumetric flow by integrating temperature measurement and onboard flow computation, enabling direct mass flow outputs for steam and gases. Advanced capabilities such as steam quality monitoring (wet steam detection) can improve operational safety and energy efficiency, and certain designs support use in safety-related monitoring applications with independent functional safety evaluation.

Typical applications span steam generation and distribution, boiler and heat-supply systems, compressed air networks, nitrogen and carbon dioxide service, flue gas and liquefied gas metering, and liquid services such as solvents, demineralized water, condensate, heat-transfer oils, and boiler feedwater. The technology is commonly applied in chemical and petrochemical processing as well as power and energy operations where mixed utilities and varying operating conditions are present.

Engineering considerations include ensuring sufficient flow velocity for vortex formation, managing vibration, and providing the appropriate straight-run conditions and pressure/temperature compensation where mass flow is required. Wet steam, two-phase flow, or pulsating service should be evaluated for suitability and diagnostics. Proper materials, pressure class, and electronics selection align the meter with temperature extremes and corrosive environments while supporting integration with control and asset management systems.

Instrumentation and Controls., an exclusive authorized representative of sales and service for Endress+Hauser.