Vane wheel anemometer FA – for measuring the flow rate of gases and liquids

How does flow rate measurement with a vane wheel anemometer in gases/liquids work?

Measurement is based on a vane wheel rotating at a speed proportional to the flow velocity of the fluid which surrounds it. The rotational speed is virtually independent of density, pressure and temperature of the medium. Vane wheel anemometers can be used in gases and liquids.

Sensing the vane wheel rotation is by a proximity switch which has no braking effect on the vane wheel flow meter. A further proximity switch allows sensing of rotational direction and with it recognition of the +/-direction of flow. Contamination does not influence pulse recognition. A further proximity switch allows sensing of rotational direction and with it recognition of the +/-direction of flow.

Thanks to the lightness of the vane wheel, the rotation speed adjusts to velocity increases in milliseconds in gases and liquids, thus ensuring precise measuring.

Vane wheel flow meters can be adjusted and calibrated at the same frequency, so that flow sensors of the same type are interchangeable without restriction. Vane wheel measuring sensors accurately detect even very slight, bidirectional flow velocities. The measured data is recorded, monitored and evaluated per laptop, so that consumption and leakage in drinking water systems can be rapidly identified.

For which media is a Höntzsch anemometer suitable?

Höntzsch flow rate measuring instruments offer a wide range of applications in diverse branches of industry. Whether in liquid or gaseous media or at high pressure, vane wheel flow sensors always deliver reliable results. Whether in liquid or gaseous media, at high pressure or high temperatures, vane wheel flow sensors always deliver reliable results. An advantage compared to other measuring methods, is the application in fluids with varying gas compositions. Vane wheel flow meters are also an excellent choice for measuring in demineralised, purified water, as electromagnetic flow meters are suitable only to a limited extent under these conditions.

In which industries are vane anemometers used?

Höntzsch vane wheel flow sensors - examples of application:

• Flow velocity of exhaust gas, explosive process gas (Ex/ATEX)
• aggressive medium up to 550 °C working temperature
• measuring and monitoring of laminar flow in pharmaceutical applications, sterilizing tunnels, steril tunnels, glove boxes and clean room technology
• Safety-relevant measurements in blowouts, gas blowouts and flares in natural gas supply
• Aerodynamic inspections in the automobile industry and aerospace
• Measuring and monitoring of air conditioning and ventilating systems
• Fluid bed dryer
• Measurements in liquid nitrogen in cryogenic comminution
• Portable measurements in oil quenching basin in hardening plants
• Road tests or wind tunnel inspections
• Backflow and hotspots in radiators and ventilating systems
• Aerospace
• Measuring flow velocity and flow rate of liquids in pipelines (i.e. test benches with water-glycol mixtures) as well as in open tunnels or channels
• Flow measurement in town water, treated wastewater, streams, rivers and lakes (i. e. in flowing waters, fish ladders, and in fish breeding)
• Flow measurement in all industrial sectors and in municipal economy and authorities

Which designs are available for the vane wheel anemometer?

• insertion probes with probe diameter from 16 mm
• measuring tubes with inside diameter from 9.7 mm
• combined probes for measuring flow and temperature
• +/- direction sensing probes

Facts about flow measurement of gases or liquids with the Höntzsch vane wheel anemometer:

• for applications in air / gases and water / liquids
• measuring ranges in air / gases from 0.15 to 120 m/s
• in operating temperatures up to +550 °C
• corrosion resistant
• marginal pressure drop
• +/- direction sensing
• PROFIBUS / HART interface
• for applications in explosive atmospheres (ATEX, CSA)