The DN Series Vortex Flow Sensors are reportedly accurate to 1% fs of measured value and are suitable for flow ranges from 0.9 to 150 liters per minute (0.24 to 39.6 GPM). The Vortex Flow Sensors are suitable for water and water glycol based heat exchange systems, with the usual additives and other fluids.

DN Series Liquid Vortex Flow Sensors operate on the principle of Kármán’s vortex trail, where vortex-shedding flow meters present the flow in a pipe with an obstruction/bluff in the flow meter body. As velocity increases, alternating vortices are formed on each side of the bluff body and travel downstream. DN series flow sensors utilize piezoelectric sensors embedded in an ETFE vane located downstream of the bluff to detect the generated vortices. The frequency measured represents the flow velocity. The result is a temperature insensitive measurement of flow with minimal pressure loss. A flow factor is provided to convert frequency to volume flow rate for each model size.