Technicals

Control System

The Liberty CCR is controlled by two interlinked computers. Each computer has its own battery, two oxygen sensors, a pair of depth and atmospheric pressure sensors, and a helium concentration sensor. Each CU controls a separate electromagnetic valve for adding oxygen to the breathing loop.

The computers mutually share data from the sensors (each of the computers has access to data from all four oxygen sensors), and mutually synchronize all performed operations, such as decompression calculation. If one of the computers fails, the remaining one has available all necessary devices (oxygen and helium sensors, solenoid) and information (decompression model status) for problem-free continuation of the dive and the diver’s return to the surface.

Two display units a head-up display and buddy display are connected to each control unit. The control units can shut down power to the handsets in the event of a malfunction or short (e.g. in the case of cable damage). The handsets do not control the solenoids, nor do they perform decompression calculations. They serve only as the terminal devices of the control units.

The head-up display (HUD) has three tri-color LEDs and is attached to the DSV in the diver’s field of vision. Blinking LEDs indicate the measured partial pressure of oxygen in the breathing loop as well as danger or malfunctions. The buddy display (BD) on the head of the apparatus notifies the diver’s partner or instructor of critically dangerous levels of the partial pressure of oxygen. The positioning of the HUD and BD are configurable so that you can exchange them or, for example, install two HUDs at the same time.


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