Acoustic Release Specification

The Marine Electronics range of Acoustic Release Systems are designed to be easily installed, robust and reliable. The basic release mechanism consists of a DC motor driven rotating shaft protruding from a pressure housing which releases a hook and allows the attached load to drop off. The standard release unit can handle loads up to 250kg, alternatives are available for loads up to 5 Metric Tons.

The acoustic link used to communicate with the release is based on Marine Electronics proven multi-frequency time delay method giving reliability in the most hostile environments. The release mechanism can be either mounted in the base of the Transponder or operated as a stand alone unit with a cable connecting it to the Transponder.

The surface control unit to operate the release is the model 348 which communicates with the transponder via a remote active transducer for the electrical to acoustic interface. The standard acoustic frequencies operate in the 30KHz band giving ranges up to 1500 metres with alternative versions available in the frequency range 7KHz to 100KHz.



  • Storage Temperature -10C to +60C
  • Operating Temperature 0C to +40C


  • Housings available in anodised aluminium or stainless steel
  • Tube diameters from 102mm to 153mm
  • Release loads from 250kg to 5 Tonnes
  • Depth rating 1000m to 6000m


  • Listening life from 3 months to 10 years
  • Battery packs made from either rechargeable Nickel Metal Hydride, Alkaline Manganese or Lithium Sulphur Dioxide
  • Transmit and Recieve Frequency in the range of 7kHz to 100kHz
  • Armed and Fired position detection switches
  • Automatic ranging mode on release
  • Range timing accuracy to 0.1m
  • Magnetic and mechanical on/off switches
  • Low standby current

Transponder Control Unit


  • Integral or remote release mechanisms
  • Mechanical or electrical release mechanisms
  • Release loads to 5 Tonnes
  • Multi-release mechanisms from one Transponder
  • RS232 communication
  • Intelligent acoustic telemetry
  • Choice of acoustic telemetry format
  • Contact closure or voltage outputs for remote
    control of subsea devices
  • External battery packs for diver replacement

Copyright © 2006. Marine Electronics Ltd.