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      Burkert Middle East FZE
      Ras al Khaimah | United Arab Emirates

      Phone +971 7207 6696
      Fax +971 7207 6695
      E-Mail fnyrf.nr@ohexreg.pbz
      Website www.burkert.ae
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      Daly Fluid Technologies LLC – DFT
      Dubai | United Arab Emirates
      Phone +971 4887 8185
      Fax +971 4887 8184
      E-Mail fnyrf@qsgzr.pbz
      Website http://www.dftme.com/
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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.

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