Points to observe: To detect the vortices a150 kHz sound is used. The top white sensor is the sender of the 150 kHz. The bottom white sensor is the receiver of the 150 kHz. The sound is reflected from a flat surface and should not reach the receiver a second time. Install the vortex airflow sensor in such a way that the sound can not reach the receiver via reflected surfaces shorter than 10 inches to prevent false readings.

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