Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Broadband Ultrasonic Transducer: Clean Impulse Response

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BII-7690 Broadband Ultrasound Transducer: 0.1 to 10 MHz

BII-7690 series low Q (broadband) ultrasonic transducers are designed primarily for use in short-distance echo sounding underwater and NDT (Nondestructive Testing) such as underwater sound velocity profiling, underwater distance gage, flaw detection, thickness gaging and materials characterization. However, these transducers can also be used as low-power general-purpose Sonar transducers. The typical Q is 1.3 (or 3) and results in clean impulse response to spike (Negative or Positive), pulse and burst SINE/Square/Chirp excitation.

BII-7690HT is high temperature low Q (broadband) ultrasonic transducers for uses in high temperature liquids of 120°C or 248°F. 

BII-7690's plastic housing resists attack by acids, alkalis, salt solutions and most other chemicals. There is no risk of corrosion when exposed to naturally corrosive conditions. They will not rust or corrode from electrochemical and galvanic environment.

Technical notes
The cable has adverse effects on the transducer performances in high frequency range. The longer the cable is, the worse the adverse effects on the transducer performance is. When you place order, please specify the shortest cable length acceptable to your project. If you use long cable in your project, you may have an impedance matching unit built inside the transducer to match cable impedance such as 50 ohms RG58 coax.
For use in air, the couplant is a must-have material to provide efficient acoustic coupling between the transducer face and the piece under test.
Solvents shall not be used with BII-7690 series transducers, such as hydrochloric acid, isopropyl alcohol, ethyl lactate, acetone, xylene, Iso hexanes, mineral spirits, etc...

Benthowave stocks following cables:  
Cable Nominal Impedance
RG58 Coax 50 Ω
RG174/U Coax 50 Ω
Shielded Cable, Two Conductors 67 Ω
Shielded Cable, Two Conductors 90 Ω
Shielded Cable, Four Conductors 52 Ω
Suggested Application  
Sound Velocity Profiler
Short Range Navigation, Underwater Robot
Underwater Sound Velocimeter/Sound Velocity Probe
Precision Underwater Distance Gage, Altimeter, Liquid Level Detector
Flaw Detection
Thickness Gaging
Longitudinal Wave Excitation
Materials Characterization
Low Q/Broadband
Clean Impulse Response
Excitation: Spike, Pulse and Burst SINE/Square/Chirp
Rust/Corrosion Free, Resistant to Chemical Attack
Related Products  
BII-8010 Ultrasonic Pulser-Receiver BII-1000 Preamplifier
BII-5000 Power Amplifier BII-6000 Impedance Matching and Tuning


Transducer BII-7691 BII-7692 BII-7693 BII-7694 BII-7695 BII-7696 BII-7697 BII-7698 BII-7699
Frequency: 0.1 MHz 0.2 MHz 0.5 MHz 1.0 MHz 2.25 MHz 3.5 MHz 5.0 MHz 7.5 MHz 10.0 MHz
Q: 3 3 1.3 1.3 1.3 1.3 1.3 1.3 1.3
Size (ΦDxHmm): 48x53 48x46 48x60 33x40 33x40 27x40 27x40 21x30 21x30
Maximum Drive Voltage: 600Vp 600Vp 600Vp 500Vp 200Vp 150Vp 100Vp 60Vp 50Vp
Service Temperature: -10°C to +60°C or 14°F to 140°F
Maximum Depth: 300m
Impedance Matching: Custom-made BII-6000: 4 to 16Ω, 50Ω, 60Ω, 100Ω ... Order separately, Append IM to part number.
TRSwitch: BII-2100 Transmitting & Receiving Switch; Not Included. Order Separately, Append TR to part number.
Cable: 1. Shielded Cable (SC)
2. RG58 50Ω Coax (Voltage Rating ≤ 50Vrms) (RG58)
3. Wire/Cable Bundle (WCB): ONLY for Thru-hole Mount with BII-769xTR and BII-769xTRIM.
Connector: 1. Wire Leads (WL)
2. Underwater Mateable Connector (UMC)
3. 50Ω BNC Male (Voltage Rating ≤ 50Vrms) (BNC)
    Warning: It is buyer's sole responsibility to make sure that the (female) BNC shield of the signal source is
    firmly grounded for operating safety before hooking up transducer to the signal source.
Transducer BII-7693HT BII-7694HT BII-7695HT BII-7696HT BII-7697HT
Frequency: 0.5 MHz 1.0 MHz 2.25 MHz 3.5 MHz 5.0 MHz
Q: 1.3 1.3 1.3 1.3 1.3
Size (ΦDxHmm): 42x60 30x40 30x40 23x40 23x40
Maximum Drive Voltage: 300Vp 250Vp 100Vp 75Vp 50Vp
Service Temperature: -15°C to +120°C or 5°F to 248°F
Maximum Depth: 100m
Cable: 1. High Temperature Wires (HTWR): Not shielded
2. High Temperature Shielded Cable (HTSC)
Connector: Wire Leads (WL)
Click High Temperature Omnidirectional Transducer: 0.1Hz to 200kHz, Omnidirectional, Transmitting and receiving sounds.
Miscellaneous: BII-7690 Series Transducers
Mounting Options: 1. Default: Free Hanging (FH)
2. Thru-hole Mounting with Single O-ring (THSO)
3. Thru-hole Mounting with Double O-ring (THDO)
4. Bolt Fastening Mounting (Stainless Steel): (BFMSS)
5. Flush-mounting: (FSM)
    Fastening Torque: ≤14Nm, a nut is included. Marine sealants are NOT included.
    ΦD=76mm, L=51mm Wall Thickness:≤41mm (BII-7691 and BII-7692 ONLY)
    ΦD=59mm; L=28mm Wall Thickness:≤18mm (BII-7693,BII-7694,BII-7695,BII-7696,BII-7697,BII-7698, BII-7699,
Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Cable Length: 1. default: 0.3m
2. Customized: up to 10m shielded cable
2. Customized: up to 30m 50Ω coax
Storage Temperature: -40°C to +60°C
How to Order: Click How to Order.
Transducer Wiring: Click Transducer Wiring for detailed wiring information.

System Setup

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