A.SCOPE Thisspecificationcoversthewaterprooftypeultrasonicceramicmicrophoneswhichareusedforreceiverandtransmitterofultrasonicwaves. B.SPECIFICATIONNo.ItemUnitSpecificationCondition1NominalFrequencyKHz40.0 2TransmittingSoundPressureLeveldBMin.90at40KHz,10Vrms,30cm(0dB=0.02mPa)SeeFig.13ReceiveSensitivitydBMin. 67at40KHz(0dB=V/uPa)SeeFig.24CapacitancepF1800 30%at1kHz5NominalImpedance 1000 6Max.DrivingVoltage(cont)Vrms20 7Bandwidt(-6dB)F.O.M.KHz1.2 8TotalBeamAngle-6dB 60otypical 9DetectableRangem0.2~3 10Operatingtemp.℃-40~+80 11StorageTemperature℃-40~+80 12Material Aluminium 13Terminal pintypeSeeappearancedrawing14EnvironmentalProtectionRegulation RoHS