Kobold DON-05Bx, Operating Instructions Manual, Page: 6 / 55

DON
page 6 DON K18/0418
5. Operating Principle
Oval gear flowmeters are categorized as positive displacement flow technology.
When liquid flows through this type of positive displacement flowmeter, two oval
geared rotors measure a constant volume per rotation within a precisely
machined measuring chamber. With each rotation, a constant volume of liquid is
measured. The rotation of the oval gears is sensed via magnets embedded within
the rotors. These magnets transmit a high resolution pulse output. The output
signal can be process externally via a remote display controller or PLC or via a
variety of output/display options available as accessories attached to the
flowmeters.
The positive displacement flow technology allows for precise flow measurement
of most clean liquids regardless of the media conductivity. Other liquid properties
also have a minimal effect on the performance of this type of meter. Flow profile
conditioning is not required as with alternative flow technology options making
oval gear installations simple to install in tight spaces and at an economical price.
OPERATION:
Liquid travels around the crescent
shaped chambers created by the
rotational movement of the rotors
liquid exits the
measuring chamber
liquid entering
measuring chamber
liquid in transit