| Specification | 
        
         
          | 400PT120 | 
          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 | 
          115dB min. | 
        
         
          Receiving Sensitivity at resonant frequency; 0dB=1 volt/µbar | 
          -68dB min. | 
        
         
          | Nominal Impedance (Ohm) | 
          1000 | 
        
         
          | Ringing (ms) | 
          1.2 max. | 
        
         
          | Capacitance at 1KHz ± 20% | 
          2400pF | 
        
         
          | Max.Driving Voltage | 
          100Vp-p @20 bursts, 25 ms repetition rate | 
        
        
          | Total Beam Angle -6dB | 
          85° typical (400PT120) | 
        
         
          | 120° typical (400PT12P) | 
        
        
          | Operation Temperature | 
          -30 to 70° C | 
        
        
          | Storage Temperature | 
          -40 to 80° C |