• balanced output hydrophone;
  • operates in heavy interference environment;
  • can be used with extra-long cable;
  • detection of earthquakes in oceans;
  • seismic studies at sea shelf.

POR (price on request)


of BC 313 hydrophones



used for measurements by immersing into water on the cable


used for measurements by cutting-in to the wall of sealed vessel or pipe



of BC 313 underwater/threaded hydrophones

Designation BC 313
Version underwater threaded
Nominal sensitivity * 50 µV/Pa
500 µV/Pa
5,000 µV/Pa
Sensitivity level* (relative to 1V/µPa) -206 dB
-186 dB
-166 dB
Frequency band 20…20,000 Hz
Maximum value of measured sound pressure range*
(as per nominal sensitivity)
50 kPa
10 kPa
1 kPa
Limit static line pressure** 60 MPa
Self-noise*** (as per nominal sensitivity) 0.2 Pa
0.1 Pa
0.01 Pa
Supply voltage (bipolar) ±10…±15 V
Current consumption 20…30 mA
Output resistance
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 1,000 m
Cable outer diameter 6 mm
Cable type coaxial with PVC coating, central wire, screened, resistive to environment containing sulfuric acid
Cable connection end-piece with wires
Measurements operation environment water, air, oil and oil products, natural gas
Operation environment temperature 0…+60 °C
Environment air temperature −60…+80 °C

*The parameter shall be determined when placing an order. The default parameter is set for the nominal sensitivity of 500 µV/Pa, for special order, the parameter value is set at 50 µV/Pa or 5,000 µV/Pa.
** 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.
***Self-noise referred to output in the frequency band: from 10 Hz to the band upper limit.


of BC 313 underwater/threaded hydrophones

non-dismantling control

screened sensing element

corrosion-resistant casing

low-noise connection cable

Installation specifications

for threaded hydrophones ВС 313

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 alternatives (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 313 underwater/threaded hydrophones

Hydrophone BC 313 are connected to FFT spectrum analyzers ZET 017 over ZET 430 matching device, which provides power supply for the hydrophone, sending output signal from hydrophone to the FFT spectrum analyzer, and also, sending test signals from FFT spectrum analyzer integrated generator to conduct non-dismantle calibration of hydrophones.

Hydrophone BC 313 - measuring system components

Hydrophone BC 313 - measuring system layout


of BC 313 underwater/threaded hydrophones

Hydrophone BC 313 - structural diagram of measuring system

S+ Non-inverting output
S- Inverting output
+12V Power input +
−12V Power input −
ACT Electric monitoring (calibration)
GND Transducer screen
Common supply wire


Frequency response of Hydrophone BC 313 is shown in the chart.



of BC 313 underwater/threaded hydrophones

Hydrophone BC 313 is a dynamic pressure transducer with even response curve throughout the complete range of frequencies observed in any homogeneous medium, including air, sea and fresh water; the hydrophones are also intended to address hydroacoustics issues: to measure sound pressure level in liquid media and to observe cavitation processes.

Hydrophone BC 313 uses piezoceramic element as a signal transducer. The integrated amplifier allows transmitting signals via long submarine cables (down to 1,000 m ocean depth).

Hydrophone internal nodes are electrically insulated from the metal casing. Special attention has been paid to signal interference protection. This enables using hydrophones both in air and water reservoirs, where the electric potential of water differs from that of the earth as well as in cases of high electromagnetic field presence.

Hydrophone BC 313 can be used to determine explosion pressure up to 1,000 kPa, pulse duration 2-5 ms (time sensitivity – approximately 0.1 ms).

Scope of application

of BC 313 underwater/threaded hydrophones

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