Precise Flow · Calibration · Test Equipment

BLS100 Orifice plate

The orifice plates type BLS are manufactured for installation between flanges according to standard DIN EN ISO 5167 part 2. But measuring sections with orifice plate require relatively long, straight overall lengths of 15 up to 35 x D. The remaining pressure drop is approx. 60 to 70% of the measured differential pressure.


The orifice plate BLS with handle is mostly used to measure the flow of gases, vapors and liquids, occasionally to restrict the flow or to reduce pressure. It can be easily installed directly between pipe flanges and it is especially suitable in big pipes even for subsequent installation to existing pipe systems.

BLS Orifice plate
BLS Orifice plate

Product features include:

  • Bore diameter d of 1 up to 800 mm
  • Diameters of DN 10 up to DN 1000
  • Straight inlet/outlet: min. 10 x DN/ 5 x DN
  • Connection by flanges
  • Vacuum or overpressure operation
  • Quick response time and good accuracy
  • Very good long-term stability, no moving parts


The orifice plate BLS is manufactured according to the corresponding operating conditions as pinhole aperture, quarter circle nozzle or segmental orifice and it is available in all types of seal and types of measuring edge.

The differential pressure of the measuring orifices is taken from the orifice disc in a distance a1 and a2 . A distinction is made between pressure taps as corner, flange taps and D-D/2 pressure tapping within the pipe, whereas a1 is equivalent to the pipe diameter D and a2 is identical with D/2. In special cases, the differential pressure tapping can be done similar to standard as edge or flange pressure tapping at or in the flange.

BLS orifice plates

Retrofit and replace easily

More information and technical details can be
found in the data sheet

Data sheet:

Data sheet BLS100

Additional information
on this subject:


Flow calibration

Flow element software

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