ACR Electronics GlobalFix 2842 Product Support Manual page 12

Category I beacons-Automatic deployment and activation
If the vessel sinks, the HydroFix™ HRU frees the beacon from the bracket,
allowing it to float to the surface. Built-in sensors detect that the beacon is no
longer in its bracket and when continuity is created by water between two of
the top cap screws, an activation circuit is completed.
NOTE: Transmission of the 121.5 MHz and 406 MHz signals will not occur
until 100 seconds after activation.
HRU releases the rod
separating the front and
back cover of bracket at a
depth between 4-13 feet
Y1-03-0242 Rev. B
Ejector Spring
launches EPIRB
from the bracket
allowing it to float
freely to the water
surface
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