Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC.          Underwater Acoustics

Programmable Sensitivity Hydrophone

Programmable Sensitivity HydrophoneProgrammable Sensitivity HydrophoneProgrammable Sensitivity HydrophoneProgrammable Sensitivity Hydrophone

BII-7080 is a omnidirectional programmable-sensitivity hydrophone for general purpose detection of underwater sounds. The hydrophone sensitivity is digitally or manually selected by one line, which is CMOS/TTL-compatible and power supply rail-compatible. In applications of the active Sonar and sound-source tracking (marine animals, pingers, acoustic tags...), the sound level at detection spot varies greater than 40dB (60 dB or higher) because of the variation of transmission loss, target strength, etc... The large variation of sound level will saturate fixed-sensitivity hydrophones or make recorded signals too low. Programmable sensitivity hydrophone BII-7080 is one of the solutions to solve the issue.

To track or locate a underwater sound source such as locator, acoustic beacon/pinger, acoustic tag and marine animal, please refer to following directional transducers and components for programmable receiving sensitivity:
BII-1009 Hydrophone Preamplifier With Programmable Gain
BII-7070 Directional Hydrophone
BII-7060 Hydrophone Array: Measurement of Bearing
BII-7680 Single Beam Transducer without Sidelobes
BII-7020 Hydrophone Array: Passive SONAR & Listening Systems

BII-7080  Programmable Sensitivity Hydrophone

Suggested Application Features

Receiving Array Elements
Compensate Propagation Loss & Target Strength
Tracking of Acoustic Tag/Pinger/Locator
General Purpose Low Noise Hydrophone
Sonobuoy, Dipping Sonar, Towed Sonar
Bioacoustic Research, Field Studies of Marine Animals
Passive Acoustic Monitoring (PAM System)

Dual Sensitivity in one hydrophone
Maximum Sensitivity Dynamic Range: 100 dB
Frequency Range: 1 Hz to 460 kHz
Long cable driving capability: 150m
Built-in Low power low noise preamplifier
Very low interference to acoustic field under test
Small and compact size for detection of broadband acoustic signals

Hydrophone sensitivities and Selection
1. Specify two sensitivities when ordering. for example, specify -182 dB V/μPa and -122 dB V/μPa when ordering BII-7082.
2. Select sensitivity of -182 dB V/μPa or -122 dB V/μPa manually or digitally in field with one wire.

Gain Selection Wire Hydrophone Sensitivity (dB V/μPa)
0 (Logic Low) Sensitivity 1 (For example, -182)
1 (Logic High) Sensitivity 2 (For example, -122)


Programmable Sensitivity Programmable Sensitivity HydrophoneProgrammable Sensitivity Hydrophone Programmable Sensitivity Hydrophone
Suggested DC Supply: +9VDC Battery, Marine Battery, Automobile Battery, Fixed DC Linear Power Supply, Not Included.
DO NOT use variable power supply whose maximum supply voltage is higher than the above rated voltage.
DO NOT use switching mode DC power supply.
BII-7080 hydrophone BII-7081 BII-7082 BII-7083 BII-7084
Available Voltage Sensitivity:
(dB re 1V/μPa)
(Specify when ordering)
Noise Density (RTI): 36 dB µPa/√Hz 40 dB µPa/√Hz 42 dB µPa/√Hz 51 dB µPa/√Hz
Flat Sensitivity Response:
(± 2 dB V re 1 µPa)
1 Hz to 40 kHz 1 Hz to 80 kHz 1 Hz to 220 kHz 1 Hz to 300 kHz
Usable Frequency Range: 1 Hz to 60 kHz
1 Hz to 140 kHz
1 Hz to 350 kHz
1 Hz to 460 kHz
Horizontal Directivity: Omni@50kHz Omni@70kHz Omni@200kHz Omni@350kHz
Vertical  Directivity: 230°@25kHz (-3dB) 240°@50kHz (-3dB) 210°@200kHz (-3dB) 280°@350kHz (-3dB)
High Pass Filter: Custom Custom Custom Custom
Maximum Output: 10.9Vpp@+12VDC 10.9Vpp @+12VDC 10.9Vpp@+12VDC 10.9Vpp@+12VDC
Supply Voltage: +9 to +24VDC +9 to +24VDC +10.5to+24VDC +10.5 to +24VDC
Current (Quiescent): 3.0/8.0 mA
3.0/8.0 mA 8.0 mA 8.0 mA
Operating Depth: ≤300 meters ≤300 meters ≤300 meters ≤300 meters
Weight: 100 grams 98 grams 96 grams 93 grams
Size: ΦD x L (mm) 25.4x51
ΦD x L (mm):
Sensitivity Control:
(specify when ordering)
One Wire for Sensitivity Selection:
1. Power Supply Rails
    Logic Low: 0 (Power Supply Common)
    Logic High: Vcc (Power Supply Voltage)
2. TTL/CMOS Compatible
    Logic Low: 0 to 0.8V
    Logic High: 2.4V to Vcc
3. Logic Low: 0 to (Vcc/2+0.8V)
    Logic High: (Vcc/2+2.0V) to Vcc
    Vcc: Power Supply Voltage
Cable Load Drive: 150 m @ audio frequency range
30 m @ full frequency bandwidth
Cable: Low noise shielded cable
Connector: 1. Default: Wire Leads (Pigtail)
2. BNC Male
3. 3.5 mm (⅛″) TRS Plug
4. ¼″ (6.35 mm) TRS Plug
5. XLR (unbalanced)
6. Underwater Mateable Connector
7. MIL-5015 Style
8. Custom
Mounting:  1. Free Hanging (default)
2. Thru-hole Mounting:
    Cut-out Mounting Hole: ΦD= 11.2 to 11.4mm, Thickness ≤ 10 mm
    O-ring, flat washer and lock nut are included. 
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +60°C

Free-hanging (with Underwater Mateable Connector or With Cable only)


Thru-hole Mounting

Thru-hole Mounting HydrophoneThru-hole Mounting Hydrophone

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