Täppiskeerisvooimõõturi vookanali ristlõiget tõmmatakse kokku voo kiirendamiseks ja seejärel laiendatakse, moodustades nii voo keskjoonel täppiskeerise ja selle liikumine läbi antud punkti omab sagedust, mis on otseselt proportsionaalne vedeliku vookiirusega.
The cross-section of the flow channel of the vortex precession meter is contracted to accelate the flow, and then expanded and its axis is so forming vortex precession. The vortex passes a given point with a frequency that is directly proportional to the flow-rate.
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