Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Broadband Omnidirectional Hydrophone

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BII-7000 Broadband Omnidirectional Hydrophone

The BII-7000s provide omnidirectional response within the wide frequency range (1 Hz to 460 kHz) and depth (up to 2000m), and offer excellent acoustic characteristics of low noise and durability, which make BII-7000s ideal for a wide range of oceanography applications. Besides receiving sounds, these hydrophones (without integrated preamplifier) may also be used as low power projector.

The BII-7000s with customized built-in integrated preamplifiers allow the hydrophones to be used with extension cables with no loss in sensitivity. The customized built-in high pass filter increases Signal-to-Noise Ratio, filters out unwanted noise and avoids saturation.

Optional mounting parts are available for installation on portable-mounting apparatus, submersibles, pipe, tank or vessel.

Small and compact size for detection of broadband signals
Very low interference to acoustic field under test
Broadband Response, Frequency Range: 1 Hz to 460 kHz
Omnidirectional Beam, Receiving and Transmitting
Deep Water Capability: up to 2000m
Built-in Low power, low noise preamplifier with custom high pass filter
Cable Driving Capability: up to 1000m
Easy Installation on Underwater Devices
Customized sensitivity in 60dB range for detection of strong or weak signals
Output Signal: Single-ended/unbalanced or Differential/Balanced
Suggested Application  
Low Noise Omnidirectional Hydrophone
Low Power Projector
Long-baseline, Short-baseline, Ultra-short-baseline Positioning
Reference Hydrophone for SONAR Transducer Calibration
Tracking of Acoustic Tags in Marine Fisheries and Animals
Marine Bioacoustic Research Marine Animal
Ocean Surface Noise, Ambient Noise, Geologic Sounds, Biological Sounds
Vessel/Ship/Boat Traffic Noise, Noise from Construction Industry Activities
Underwater Vehicles: AUV/UUVs and ROVs, Underwater Equipment
Sonobuoy, Dipping Hydrophone, Underwater Sound Recording
Array Element, Vector Hydrophone Element
Detection of Ultrasonic Cavitation Noise
Passive Acoustic Monitoring (PAM System)
Related Products  
BII-1000 Hydrophone Preamplifier BII-7520 Omnidirectional transmitter
BII-7000 Series Hydrophone without Preamplifier
Signal Loss Over Extension Cable (dB) = 20*log[Ch/(Ch+Cc)]; Ch - Hydrophone Capacitance; Cc - Extension Cable Capacitance
Hydrophone Sensitivity
Output Type Depth
ΦD mm
BII-7001 OCV TVR Graph 1Hz to 180kHz 10.5 Omnix290°@120kHz SE 500m Φ24.5 95
BII-7002 OCV Graph 1Hz to 200kHz 4.6 Omnix290°@140kHz SE 2000m Φ24.5 96
BII-7003 OCV Graph 1Hz to 460kHz 2.0 Omnix280°@350kHz SE 950m Φ8.0 86
BII-7004 OCV Graph 1Hz to 180kHz 2.6 Omnix290°@120kHz DF 500m Φ24.5 95
BII-7005 OCV Graph 1Hz to 400kHz 0.6 Omnix280°@350kHz DF 950m Φ13.8 90
Output Type: SE: Single Ended Output; DF: Differential Output.
Sound Source: BII-7001, BII-7002 and BII-7003 can be used as low power projectors. Maximum driving voltage < 50 Vrms.
BII-7004 and BII-7005 can NOT be used as projectors.
Cable: 1. Default: Coax (ΦD=2.8mm) (Coax)
2. Shielded cable with two conductors (ΦD=3.6mm) (SC36)
3. Shielded cable with two conductors (ΦD=6.5mm) (SC65)
Cable Length: 1. default: 6m; 2. Custom: up to 100m
BII-7000 Series Hydrophone with Preamplifier
Hydrophone Sensitivity
Gain Options
Noise Density
BII-7006 OCV Graph 0/26/40/60dB 1Hz to 180kHz Omnix290°@120kHz Noise Density 500m Φ24.5x72 176
BII-7007 OCV Graph 0/26/40/60dB 1Hz to 200kHz Omnix290°@140kHz Noise Density 950m Φ24.5x72 178
BII-7008 OCV Graph 0/26/40dB 1Hz to 460kHz Omnix280°@350kHz Noise Density 500m Φ9x20
BII-7009 OCV Graph 0/26/40dB 10Hz to 350kHz Omnix280°@350kHz Noise Density 500m Φ13.8x20
Note: Size with two ΦDxL: first ΦDxL is the size of sensing element, second ΦDxL is the size of preamplifier housing.
RTI: Reference to Input.
Preamplifier: BII-1000 Series Hydrophone Preamplifier.
1. Default: BII-1060 series preamplifier. 2. Customized: Specify when ordering.
Overload Pressure Level: 20*log(Maximum Output/2.828) - Sensitivity, (dB μPa).
Filter: Built-in, Preamplifier dependent. Specify -3dB cut-off frequency when ordering.
Output Type: 1. Default: Single Ended Output (SE). Append SE to the listed part number.
2. Differential Output (DF), Exclusive to preamplified hydrophone. Append DF to the listed part number.
Maximum Output: Maximum Output of the built-in preamplifier, Vpp.
Supply Voltage: +4.5 to +30 VDC, Preamplifier dependent.
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 rated voltage.
DO NOT use switching mode DC power supply.
Current (Quiescent): Preamplifier dependent. Refer to BII-1000 Series Hydrophone Preamplifier.
Cable: Shielded Cable (ΦD=6.5mm) (SC65)
Cable Length: 1. default: 10m; 2. Custom: up to 1000m
Miscellaneous: BII-7000 Series Hydrophone
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 (Plastics): (BFMP)

5. Bolt Fastening Mounting (Stainless Steel): (BFMSS)
6. Thru-hole Mounting + Free Hanging (THFH)
Click Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Connector: 1. Default: Wire Leads (WL)
2. BNC Male (BNC)
3. 3.5 mm (⅛″) TRS Plug (TRS35)
4. ¼″ (6.35 mm) TRS Plug (TRS635)
5. XLR Plug (XLR)
6. Underwater Mateable Connector (UMC)
7. MIL-5015 Style (5015)
8. +9VDC Battery Snap (BS) (Exclusive to preamplified hydrophone)
9. Custom (custom)
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +60°C
How to Order: Click How to Order.
Hydrophone Wiring: Click Hydrophone Wiring for detailed wiring information.
Receiving Array: Array & Aperture Design

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