AR50 Acoustic Release

  • Release upon receipt of an acoustic signal (typically within 15 minutes of activation)

  • Release by electrolytic erosion of a replaceable link

  • Range of different links available (see Supplies)

  • Maximum load release 90 lb (41 kg)

  • Slant range 1,000 to 3,000 feet (305 to 914 meters) and up depending on water conditions

  • Operating depth is 0 to 600 feet (0 to 183 meters)

  • Battery life approximately one year using one set of 9 lithium AA batteries

  • Each unit has a unique four digit acoustic identification code  

  • Lower cost, smaller size, lighter weight and easier link change compared to AR60


This release unit is deployed underwater and contains the receiver plus a micro computer and batteries and holds a release link with a screw-on retainer cap for link replacement. It turns on automatically when it is placed in the ocean by means of water contact to the link and the coil contacts. It has a unique 4 digit identification number that has been assigned to it by the factory. This identification number is entered into the topside acoustic release interrogator (ARI-50) when a command is sent. When the release command is received the unit applies its full battery voltage to the link (pos) and the ‘coil’ (neg) for 15 minutes. This causes the small hoop of metal to erode away effecting the release. This release unit has a single green LED that flashes once per 10 seconds when the unit is on and listening. There is a checkout command that can be sent to cause the unit to switch on the erosion voltage for only 10 seconds which is useful for checkout.