CCR Inspiration Rebreather
Here, in contrast to the semi-closed circuit device with depth, mutable nitrox breathing.
Means of three independent oxygen sensors the current O2 partial pressure measured in the breathing circuit and by computer-controlled mixing of oxygen through an electromagnetic valve maintained at a pre-selected set point.
A breathing gas cylinder of the device containing compressed air, the other oxygen.
With increasing depth of the oxygen partial pressure in the circulation increases, air must be supplied as a so-called diluent.
For deeper dives then 60 meters to come as Heliox and Trimix diluent used.
The advantages resulting from the reduction of nitrogen loading at the same time optimized O2 partial pressure.
In many cases, longer bottom times, long dive times per Filling devices and independence with regard to logistics and dive planning are here in the foreground.
The most significant difference between a CCR and an open system is the very economic gas consumption as the following example shows:
A diver with an air consumption of 20 liters / min. and an oxygen consumption of 1 Liters / min. breathing 4 liters per minute when O2, metabolized 1 liter and breathing 3 liters unconsumed O2 out into the surrounding water.
At a depth of 40m (5 bar rises) gas consumption to 100 liters / min. and 20 liters of O2 can be inhaled.
Metabolized O2, a depths independently process, remains constant at 1 liter / min and as 19 liters per minute unconsumed O2 are exhaled into the surrounding water.
The squandering of the respiratory gas, especially oxygen, is obvious and significantly high and that all open systems together.
Rebreather offer by recycling of part or all of the unused oxygen, a much economical gas consumption and can therefore also with the typical and well smaller cylinders make do: For example, the gas supply is much more productive than the Diving in the open system.
Diving application for a CCR Rebreather Underwater photography, because the CCR rebreather is close to noise and bubbles.
Long dives Deep dives to 100m Advantages of closed-loop devices:
Optimal gas utilization, long dive times Reduced nitrogen saturation Longer bottom times, reduced requirement for decompression Noise and bubble Poverty
