Air Ultrasonic Transducer - Open Type
The Standard Open type transducers consist of a piezoelectric ceramic disc mounted at the node of its fundamental resonant frequency, a conical metal resonator bonded at the center of disc acting as a rigid piston. This special construction provides high sensitivity, wider bandwidth, and excellent durability in wide temperature and humidity ranges and high stability in electrical and mechanical characteristics. Due to its free vibration character the open type transducers are very suitable for continual wave driving, such as Doppler motion detector

400ST/R100 Finite Element Analysis
Frequency: 40.066KHz
Click for motion animation

Model Number Description Center Frequency
(KHz)
Sensitivity or SPL
(min.)
Bandwidth
(-6dB)(KHz)
Dimensions
(mm)
250ST160
250SR160
Transmitter 25.0±1.0 112dB 2.0 16.2φ x 12.0
Receiver -62dB
250ST180
250SR180
Transmitter 112dB 1.5 18.2φ x 14.2
Receiver -62dB 1.8
250ST240
250SR240
Transmitter 115dB 1.5 24.0φ x 14.0
Receiver -60dB 1.8
328ST160
328SR160
Transmitter 32.8±1.0 115dB 2.0(Tx)
2.5(Rx)
16.2φ x 9.6
Receiver -67dB
328ST180
328SR180
Transmitter 117dB 2.0 18.2φ x 14.2
Receiver -64dB
400ST100
400SR100
Transmitter 40.0±1.0 112dB 2.5 9.7φ x 6.7
Receiver -67dB 3.0
400ST120
400SR120
Transmitter 115dB 2.0 12.7φ x 8.8
Receiver -67dB
400ST160
400SR160
Transmitter 120dB 2.0 16.2φ x 12
Receiver -61dB 2.5
500MB120 Dual Pack 50.0±1.0 113/-67 dB 3.0 Dual Pack

SPL: 0dB = 0.0002ubar, measured upon 10Vrms sine wave at 30 cm distance;
Sensitivity: 0dB re 1V/ubar, receiver in parallel with a 3.9K Ohm resistor