The sensors are designed
specifically for system flow monitoring and control. Combining high accuracy
and low cost, the flow sensors are accurate to 1
percent fs of measured value. The models are suitable for flow ranges from 0.9
to 150 liters per minute. The vortex flow sensors operate on the
principle of Kármán’s vortex trail. The models 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. Versions with a 1000 Ohm RTD temperature sensor built-in to
the bluff are available, providing direct
temperature measurement in the medium.
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