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3 Device description
3.1 Functional principle
The measuring unit is driven by the flow of fluid based on the principle of a gear motor.
The gears run in a contactless manner in the measuring chamber. The lowfriction bearings or
plain bearings act as the bearing elements.
The gear movement is sampled in a contactless manner through the sensors installed in the
cover. There is a pressure-resistant amagnetic division between the sensor space and meas-
uring chamber.
During the rotation of the measuring unit by one tooth pitch, a signal occurs per sensor that
corresponds to the so-called geometric tooth volume of V
gz
. A value that is stated in tech-
nical documents as the nominal volume to specify the unit size.
The two-channel scanning facilitates a higher measuring resolution and detection of the dir-
ection of the flow rate.
In the gear type flow meter, the drive direction of the flow of fluid is independent of the dir-
ection.
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