| Specification | 
                 
                  | 235SR130 | 
                  Transceiver | 
                 
                  | Center Frequency | 
                  235.0±10.0 KHz | 
                 
                  | Bandwidth Echo  Sensitivity -6dB | 
                  10.0 KHz | 
                 
                  Echo Sensitivity 0dB re 20Vp-p sine wave, 40 bursts @ 25cm | 
                  -61 dB min.  18 mVp-p min. | 
                 
                  | Dead Zone 10 Bursts | 
                  15 cm | 
                 
                  | Capacitance at 1KHz ±20% | 
                   540 pF | 
                 
                  Max.Driving Voltage Pulse 10% duty cycle tone burst | 
                  80 Vp-p | 
                 
                  | Total Beam Angle -3dB/-6dB | 
                  7.5°/10.5° typical | 
                 
                  | Matching Window | 
                  Silicone Rubber | 
                 
                  | Operation Temperature | 
                  -20℃ to 70℃ | 
                 
                  | Storage Temperature | 
                  -30℃ to 80℃ |