en

diameter ratio

1

Terminological databases

Metroloogia terminibaas

ID 790434 Last modified 22.03.2026
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Domain metrologymeasuring instruments
läbimõõdusuhtearv preferred
läbimõõtude suhtearv
β
diameter ratio
β
  • ruutjuur voomõõturi kurgu pindala ja mõõtetoru sisepindala suhtest voomõõturist ülesvoolu
  • square root of the ratio of the area of the throat of the primary device to the internal area of the measuring pipe upstream of the primary device
  • ratio of the diameter of the orifice of the primary device to the diameter of the conduit upstream of the primary device
läbimõõdusuhtearv preferred
Usage examples
  • Standardites ISO 5167-2 ja ISO 5167-3 on läbimõõdusuhtearv esma-/primaarmõõturi suu läbimõõdu ja esma-/primaarmõõturist ülesvoolu asuva toru siseläbimõõdu suhtest ning standardi ISO 5167-4 korral, kui esma-/primaarmõõturist on ülesvoolu silindriline osa, mille läbimõõt on sama kui toru läbimõõt, on läbimõõdusuhtearv esmamõõturi suu läbimõõdu ja selle silindrilise osa läbimõõdu suhtest ülesvoolu rõhuavade tasapinnal.
läbimõõtude suhtearv
β symbol
diameter ratio
Usage examples
  • In ISO 5167-2 and ISO 5167-3 the diameter ratio is the ratio of the diameter of the throat of the primary device to the internal diameter of the measuring pipe upstream of the primary device. In ISO 5167-4, where the primary device has a cylindrical section upstream, having the same diameter as that of the pipe, the diameter ratio is the ratio of the throat diameter to the diameter of this cylindrical section at the plane of the upstream pressure tappings.
β symbol

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