Description
The Model31 Karman Vortex Flow Meter employs the follow-ing principle for measurement of flows: When a columnar object (object that generates vortices) is placed in the flow path of a fluid, regular channels of vortices, called Karman vortex channels, are generated at the back of the object. Since the frequency of a vortex generated is linearly propor-tional to the flow velocity within a given range, the flow amount can be measured by counting the number of vortices. When the frequency of each vortex generated is detected by the incorporated vortex detector (piezoelectric device), the signal processing circuit outputs a signal which is linearly pro-portional to volume flow.