TYPE 8104

Standard measuring hydrophone with integral 10m cable terminated BNC plug

A general purpose hydrophone, also ideal for calibration purposes


Type 8104 is a general purpose hydrophone, also ideal for calibration purposes.


  • Calibration reference standards 
  • Ultrasonic measurements in liquids 
  • Cavitation measurements 
  • Laboratory and industrial measurements in liquids and gases 
  • As underwater projectors (8103, 8104 and 8105) 
  • Noise measurements in humid and polluted atmospheres
    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 at 20°
    56 uV/Pa ± 15 uV
    Charge sensitivity
    0.44 pC/Pa
    Capacitance with integral cable
    7800 pF
    Frequency range re. 250 Hz
    0.1Hz to 10 kHz (±1.5 dB) / 0.1Hz to 120 kHz (+4/−12.0 dB)
    Operating temperature range short-tem continuous
    -30 to +80
    Max operating static pressure
    252 dB = 4 × 10^6 Pa
    120 mm (4.73 inch)
    Weight including integral cable
    1.6 kg (3.5 lb)
    Integral cable
    10 m waterblocked low-noise shielded cable to MIL-C-915 with BNC plug