A.SCOPE Thisspecificationcoversthewaterprooftypeultrasonicceramicmicrophoneswhichareusedforreceiverandtransmitterofultrasonicwaves. B.SPECIFICATION No.ItemUnitSpecificationCondition1NominalFrequencyKHz40.0 2TransmittingSoundPressureLeveldBMin.94at40KHz(0dB=0.02mPa)SeeFig.13ReceiveSensitivitydBMin. 75at40KHz(0dB=V/Pa)SeeFig.24Directivitydeg110x45 5CapacitancepF2300 20%at1kHz6DetectableRangem0.3~1.5 7AllowableInputVoltageVp-p100Pulsewidth0.8ms,Interval60ms(at40KHz)8Operatingtemp.℃-40~+80 9Material Aluminium 10Terminal wiretypeSeeappearancedrawing