Pro-Wave Electronics 400ST/R160 Air Ultrasonic Ceramic Transducers are suitable for continual wave driving, such as Doppler motion detector. A piezoelectric ceramic disc is mounted on the node of the fundamental resonant frequency and a conical metal resonator is bonded at the center of the disc that acts as a rigid piston. This special construction provides high sensitivity, a wider bandwidth, excellent durability in wide temperature and humidity ranges, and are vibration free.

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