Vortex Flow Meters (Höntzsch VA40)

It's a flow sensor that counts the eddies, or vortices, shed by a bluff body placed in the gas stream, at a frequency proportional to velocity. The Höntzsch VA40 has no moving parts, reads flow velocity, flow rate and total volume, and covers 0.5 to 40 m/s in one probe.

A bluff body in the flow path sheds vortices downstream in a regular pattern, and the frequency of shedding rises in direct proportion to flow velocity. An integrated transducer counts that frequency electronically and converts it into a velocity, flow rate or volume reading, without any moving parts in the sensing element itself.

It reads from as low as 0.5 m/s up to 40 m/s, a 1:80 measuring dynamic. That wide turndown means the same probe often covers both minimum and peak flow conditions in a compressed air or process gas line, rather than needing separate instruments for each range.

Yes. Downstream straight run and stable inlet conditions are critical, because disturbed flow upstream from a bend, valve or fitting can affect the vortex shedding pattern the VA40 relies on. Confirm your piping layout provides adequate straight run before specifying the installation.

Yes, ATEX versions are available for Category 3G and 3D, covering Zone 2 and 22. Confirm your site's zone classification against this rating before ordering, since it doesn't extend to the higher-risk Category 1 or 2 zones.

Compressed air and gas consumption metering, biogas and process gas flows, and exhaust or ventilation duct monitoring are typical duties. The lack of moving parts suits long-term stationary monitoring where a mechanical probe would need more frequent maintenance checks.