Poetter probe
The Poetter probe is a dynamic pressure probe and works according to the differential pressure method to measure volume or mass flows in pipelines or channels. The dynamic pressure on the upstream side and the static pressure on the downstream side form the so-called effective pressure (differential pressure), which increases by the square of the flow velocity.
Except for the basic physical principle, the sword-shaped Poetter probe has hardly anything in common with conventional pitot tubes. The front width of the Poetter probe is only 10 mm and only protrudes halfway into the pipe. Thanks to the significantly reduced inflow area, the measurement disturbances due to the formation of eddies were eliminated. In addition, the permanent pressure loss, which is usually associated with the destruction of energy, is almost zero and can no longer be calculated or measured. Scientists also found out that a so-called “Eulerian / d'Alembertian paradox ” arises, which causes the dynamic pressure in the frictional resistance to almost completely dissolve.
"In the upstream and side areas of the Poetter probe no eddies can be detected, only in the wake there is a small recirculation area."
Application examples
The Poetter probe is just as suitable for measuring the flow of liquids, gases and vapors as it is for media saturated and / or contaminated with water vapor.
The Poetter probe is available in nominal widths from 20 mm to 12,000 mm. There are no restrictions in use for high pressures and / or high temperatures or aggressive media.
Parameters for the calculation
The calculation is based on EN ISO 5167-1 , whereby knowledge of the medium, pressure, temperature, Q max and the dimensions of the pipeline are required.
