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    • Main Office
      Burkert Contromatic (Proprietary). Ltd.
      Visitors address:

      233 Albert Amon Road
      Millennium Business Park
      Meadowdale / Germiston

      Mailing address:

      P.O. Box 26260
      East Rand
      1462
      Phone +27 11 574 6000
      Fax +27 11 454 1477
      E-Mail fnyrf.mn@ohexreg.pbz
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      Durban Branch
      32 Grays-Inn Crescent
      Westville

      Phone +27 31 266 1600
      Fax +27 31 266 1495
      E-Mail fnyrf.mn@ohexreg.pbz
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      Cape Town Branch
      Unit 26, Northgate Business Park
      Northgate Estate

      Phone +27 21 510 7137
      Fax +27 21 510 7135
      E-Mail fnyrf.mn@ohexreg.pbz
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Volumetric measuring method: oval gear

Principle of oval gear with pulse output

Two intermeshed oval cogs - mounted perpendicular to the flow direction in a special housing - are caused to rotate by a flowing fluid. One of the two oval gears meshing 90° offset alternately encloses a defined fluid volume between the outer wall of the housing, outer side of the oval wheel and the two flat covers of the housing. Rotation of the oval gear pumps this chamber volume towards the chamber outlet. Two chamber volumes per oval gear - thus totaling four - are pumped per revolution. A permanent magnet positioned on one of the oval gears is used to detect the rotary movement. A Hall sensor which detects the magnetic field of the oval gear and generates a square-wave signal is arranged outside of the medium area in an electronics housing. A coil sensor cannot be used since the rotational speed of the oval gear is too low to allow signal detection. The number of pulses is directly proportional to the number of chamber volumes pumped.