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Bypass flow meters


  • wide choice of materials
  • high volume rates of flow possible
  • orifice plate can be installed in any position
  • no power requirement for indication
  • easy to install
  • measuring accuracy +/- 2 % FS
  • scale specific to the process fluid
  • optionally limit value switches

Fields of use

  • building technology
  • swimming pools


The wide choice of materials that can be used to manufacture our DST bypass flow meters allows flow measurement of the most varied fluids.

The low-cost device in PVC is frequently used in swimming-pool water technology. The device in PVDF is suitable for the flow measurement of aggressive media, e.g. in water treatment, while the DST-1/2 is mainly used for flow measurement of air and gases. The measuring range extends from 0.02 – 0.16 m3/h to 300 – 1800 m3/h for H20, and from 0.15 m3/h – 1.5 to 1200 – 6000 m3/h for air at STP.

The DST bypass flow meter operates on the differential-pressure method. A ring with an orifice plate is installed in the pipeline. The orifice plate causes constriction of the flow and effects a drop in pressure. This pressure drop is proportional to the square of the flow rate.

If the pressure tap upstream of the orifice plate is connected by a pipe to that downstream of the orifice plate, a partial flow will flow through that pipe. This partial flow is proportional to the flow rate in the main pipeline.

The partial flow can be turned on and off, as required, by installing two ball valves in the bypass line.


  • water
  • air
  • transparent fluids
  • agressive media (device in PVDF)

Operating principle

The flow running through the bypass is proportional to the full flow of the mainstream and serves the flow meter to generate the indicated value.


Kirchner und Tochter offers a wide range of well approved methods of flow measurement.

Variable area flow meters
Short-tube flow meters
Flap-type flow meters
Differential pressure flow meters
Bypass flow meters
Level indicators
Sight glasses
Electrical accessory equipment