| Specification | 
        
         
          | 400EP18D | 
          Transceiver | 
        
         
          | Center Frequency | 
          40.0±1.0KHz | 
        
         
          | Bandwidth(-6dB) | 
          2.0KHz | 
        
         
          Transmitting Sound Pressure Level at resonant frequency; 0dB re 0.0002µbar per 10Vrms at 30cm | 
          100dB min. (transducer alone) | 
        
         
          Receiving Sensitivity at resonant frequency; 0dB=1 volt/µbar | 
          -80dB min. (transducer alone) | 
        
         
          | Nominal Impedance (Ohm)           | 
          1000 | 
        
         
          | Ringing (ms) | 
          1.2 max. | 
        
         
          Capacitance 
            at 1KHz ± 20%@25°C 
            Temperature compensated type
  | 
          1800 pF 3600 pF | 
        
         
          | Max.Driving Voltage | 
          100Vp-p @20 bursts, 25 ms repetition rate | 
        
         
          | Total Beam Angle -6dB | 
          135° typical (Wide) 75° typical (Narrow) | 
        
         
          | Operation Temperature | 
          -40 to 70° C | 
        
        
          | Storage Temperature | 
          -40 to 80° C |