• hydrophone with a two-wired IEPE connection;
  • screened and isolated from the environmental impact;
  • monitoring and diagnostics of liquid pipeline systems;
  • inspecting subsurface part of sonar structures.

POR (price on request)


High-sensitivity multicomponent phased hydroacoustic systems for signal source detection and localization.


of BC 312 underwater/threaded IEPE hydrophones

Designation BC 312
Version underwater threaded
Nominal sensitivity 200 µV/Pa 150 µV/Pa
Sensitivity level (relative to 1V/µPa) -192 dB -194 dB
Frequency band 20…20,000 Hz
Self-noise*, RMS 0.02 Pa
Maximum value of measured sound pressure range 50 kPa
Limit static line pressure** 60 MPa
Output direct voltage level 10…13 V
Power IEPE (DeltaTron/ ISOTRON)
Supply voltage +(18…30) V
Supply current 3 mA
Explosion-proof version upon request
Casing material stainless steel
Dimensions (length × casing diameter) 173 × ⌀23 mm 171 × ⌀23 mm
Coupling thread M20×1.5
Weight (without cable)
Cable standard length 10 m 2 m
Maximum cable length 100 m
Cable outer diameter 10,2 mm
Cable type coaxial, PVC coating, central wire, screened, resistive to the environment containing sulfuric acid
Cable plug BNC
Measurements operation environment water, air, oil and oil products, natural gas
Operating environment temperature 0…+60 °C
Environment air temperature −60…+80 °C

*  Intrinsic noise at the input within the frequency range of 10 Hz from the frequency range upper limit.

**The limiting hydrostatic pressure is indicated for the receiving element of the hydrophone and can be limited by the technical characteristics of the cable, in the case of immersion studies.

Hydrophones BC 312 are dynamic pressure transducers with even response curve throughout the whole range of frequencies observed in any homogeneous medium, including air, sea and fresh water.

Hydrophones BC 312 are used to determine explosion pressure in the range up to 1,000 kPa, pulse duration 2-5 ms (time sensitivity: some 0.1 ms).

Hydrophones BC 312 are used in hydroacoustics for reading-through underwater signals and noise, for measuring purposes, and also as components of beamed receiver hydroacoustic antennas.

Hydrophones BC 312 can be supplied without an integrated amplifier, in such case, it can be used as a sonar transmitter.

Installation specifications

for threaded hydrophones ВС 312

The hydrophones are connected to special mounting seats, adapters, weldolets, etc.

Hex section of the hydrophone connection is used for installation of the hydrophone. It is not recommended to use any other parts of the hydrophone in the course of hydrophone mounting.

In order to maintain hermeticity of the hydrophone you can use additional plate included into the delivery scope (copper gasket). It is not recommended to use any other options (foam tape, plumbing hemp, etc), since it may negatively affect the hermeticity level.

Hydrophone BC 312 - mounting seat layout and dimensions

Mounting seat layout

Hydrophone BC 312 - mounting seat parameters

Example of threaded hydrophone installation


of BC 312 underwater/threaded IEPE hydrophones

Hydrophones BC 312 are connected directly to FFT spectrum analyzers.

The scheme connectivity submersible hydrophone

The scheme connectivity Mortise hydrophone

Hydrophones BC 312 support transducers scanning technology TEDS (Transducer Electronic Data Sheet), which allows the FFT spectrum analyzer to automatically determine transducer type and sensitivity, in accordance with IEEE P1451.4 standard.


of BC 312 underwater/threaded IEPE hydrophones

Frequency response characteristics of Hydrophones BC 312 in receiver mode are shown in the chart

Hydrophone BC 312 - Frequency response characteristics diagram


of BC 312 underwater/threaded IEPE hydrophones

BC 312 are piezoelectric hydrophones with piezoceramic sensing element.

To enhance sensitivity, and to eliminate cable shunting effect, a pre-amplifier is used in Hydrophone BC 312. It is mounted in one casing with the receiver and then is immersed in the water on cable together with it.

Hydrophone BC 312 by ZETLAB Company - component of Leak Detection System

Application scope

of underwater / threaded IEPE-hydrophones BC 312


Hydrophone calibration

For the purpose of periodical hydrophone calibration, a number of specific systems are used.
Even though such systems have a lot of unique technical features, the overall principle of their operation and use is quite similar.
Hydrophone calibration system is sound pressure source having precise parameters. It should be noted that the hydrophone calibration system itself should undergo obligatory factory calibration so that to make sure that the sound pressure level parameters of the hydrophone calibration system meet necessary requirements.

Hydrophone BC 312 calibration system structure is similar to that of pistonphone – it has a coupler cavity, set of pistons and a rotating part causing the pistons to produce and maintain sound pressure level in accordance with the specified parameters.
Most of the systems used for hydrophone calibration can be used in the field environment and preserve their operational and functional parameters in various humidity, temperature, and pressure environments.

All the hydrophones manufactured by ZETLAB Company undergo obligatory calibration with the use of Brüel & Kjær Hydrophone Calibrator (Type 4229).

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