Vortex Flowmeters

Vortex flow measurement: Robust and universally applicable for liquids, gases and steam.

Vortex flowmeters are used in numerous branches of industry to measure the volume flow of liquids, gases and steam. Applications in the chemicals and petrochemicals industries, for example, in power generation and heat-supply systems involve widely differing fluids: saturated steam, superheated steam, compressed air, nitrogen, liquefied gases, flue gases, carbon dioxide, fully demineralized water, solvents, heat-transfer oils, boiler feedwater, condensate, etc.

Proline Prowirl F 200 Vortex Flowmeter

Proline Prowirl F 200 Vortex Flowmeter

This unique flowmeter provides extreme accuracy and can detect wet steam conditions.

Predecessor model: Proline Prowirl F 200 / 7F2B

Max. measurement error
Volume flow (liquid): ±0.75 %
Volume flow (optional): ±0.65 %
Volume flow (steam, gas): ±1.00 %
Mass flow (saturated steam): ±1.7% (temperature compensated); ±1.5% (temperature/pressure compensated)
Mass flow (superheated steam, gas): ±1.5 (temperature/pressure compensated); ±1.7% (temperature compensated + external pressure compensation)
Mass flow (liquid): ±0.85%

Measuring range
Liquid: 0.076 to 2100 m³/h (0.045 to 1300 ft³/min)
depending on medium: water with 1 bar a, 20 °C (14.5 psi a, 68° F)
Steam, gas: 0.39 to 28000 m³/h (0.23 to 17000 ft³/min)
depending on medium: steam with 180 °C, 10 bar a (356 °F, 145 psi a); air with 25 °C, 4.4 bar a (77 °F, 63.8 psi a)

Medium temperature range
Standard: –40 to +260 °C (–40 to +500 °F)
High/low temperature (option): –200 to +400 °C (–328 to +752 °F)

Max. process pressure
PN 100, Class 600, 20K

Wetted materials
Measuring tube: 1.4408 (CF3M); CX2MW similar to Alloy C22, 2.4602
DSC sensor: 1.4404 (316/316L); UNS N06022 similar to Alloy C22, 2.4602
Process connection: 1.4404/F316/F316L); 2.4602
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Vortex Flow Measuring Principle

This measuring principle is based on the fact that turbulence forms downstream of obstacles in the flow, such as a bridge pier.

Inside each vortex flowmeter, a bluff body is therefore located in the middle of the pipe. As soon as the flow velocity reaches a certain value, vortices form behind this bluff body, are detached from the flow and transported downstream. The frequency of vortex shedding is directly proportional to mean flow velocity and thus to volume flow.

The detached vortices on both sides of the bluff body generate alternately a local positive or negative pressure that is detected by the capacitive sensor and fed to the electronics as a primary digital, linear signal.


  • Universally suitable for measuring liquids, gases and steam
  • Largely unaffected by changes in pressure, density, temperature and viscosity
  • High long-term stability: no zero-point drift and lifetime K-factor
  • Large turndown of typically 10:1 to 30:1 for gas/steam, or up to 40:1 for liquids
  • Wide temperature range: –200 to +400 °C (+450 °C on demand)