Hydrophone (Brüel & Kjær 8104)




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A wide-range standard measuring transducer for making absolute sound measurements over the frequency range 0.1Hz to 120 kHz with a receiving sensitivity of −205 dB re 1V/μPa. It can also be used as a sound transmitter (projector) which makes it ideal for calibration purposes by the reciprocity, calibrated-projector and comparison methods.






Voltage sensitivity with cable

56 uV/Pa ± 15 uV

Charge sensitivity

0.44 pC/Pa

Capacitance with integral cable

7800 pF

Frequency range re. 250 Hz

0.1 Hz-10 kHz (±1.5 dB)

0.1Hz–120kHz (+4/−12.0dB)

Operating temperature range short-term continuous

-30 to +80

Max operating static pressure

252 dB = 4 × 10^6 Pa



Weight including integral cable


Integral cable

10 m waterblocked low-noise shielded cable to MIL-C-915 with BNC plug

Download Datasheet