Custom Ultrasonic Piezo Rings OD12xID7x4mm 

Piezo ceramic ring   Material:  PCrN-4 (also called PZT-SF, hard PZT material, dielectric constant 1600) PCrN-4  is a modified hard PZT dual function of receiver and transmiting transducer.  Piezoelectric Technical data: Dimensions:  OD 12mm, ID7mm, thickness 4mm Radial Frequency Fr: 385KHz ± 5% Resonate Impedance R＜20 Ω Electromechanical coupling coefficient K33: > 0.60 Dielectric Loss tg δ: <0.5 Static capacitance Cs: 271pF± 12.5% Piezo discharge constant d33 > 320 Test Condition: 25±3 °C 40~70% R.H. fr, Zm, Kr => Radial mode vibration Cs tanδ => LCR meter at 1KHz 1Vrms SYMBOL DEFINITION UNITS ε 33 T , ε 11 T &nb…