Dive Rite O2ptima Owner's Manual download pdf (Page 12)

O ptima FX Owner’s Manual

Ch. 1 Pg. 7

The earliest designs required the diver to chose the target PO or

FO during setup but current systems allow the diver to vary the

gas mixture being breathed during the dive. These CCR systems

employ an electronically-controlled gas mixing system that blends

the gas from two separate cylinders. The first cylinder (diluent) is

usually used to make up the volume of the breathing loop while the

second cylinder (usually 100% oxygen) is used to achieve the

desired target PO . The original mixed gas CCRs were generally

configured with the left-side cylinder containing Oxygen and the

right-side cylinder contains a diluent gas such as Air or a mixture

of Helium and Oxygen (Heli-Ox), or Tri-Mix (Helium-Nitrogen-

Oxygen). Most CCR systems today reverse the cylinder placement

an go with the adage “Rich Right”.

There are also mCCR (mechanical) rebreathers that are a hybrid

design, in that they inject a fix flow of gas like many SCR designs

but usually do not vent any gas while at a constant depth like a true closed circuit system. These

systems replace the constant flow of Nitrox with Oxygen. When properly configured, mCCR

Rebreathers behave like an electronically controlled CCR in that no gas is vented except on

ascent. The DIVER is the “controller” for this design and is responsible for maintaining the

target PO by manually injecting additional oxygen when needed.

The O2ptima is an electronically controlled CCR that can operate using, Air, Heliox or Tri-Mix

as a diluent. Helium based diluents are the easiest for divers to breathe, especially at depths

greater than 130fsw/40 meters. Although the O2ptima has been designed to use gases with

Helium, the programming of these gases needs to be enabled by a entering a special PIN.

Additional training is required to receive this PIN to allow the use of the O2ptima with Helium

based diluents.

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Dive Rite O2ptima Owner's Manual Page 12