Component Features & Functions
Counterlungs
The O2ptima CM uses two integrated, chest-mounted counterlungs. The counterlung position keeps them as close to the diver’s lung centroid as possible, providing excellent breathing characteristics in a variety of…
Breathing Hoses & Fittings
The hose diameter and lengths have been specifically chosen to provide the best balance of comfort and low work of breathing. The hose lengths are some of the shortest in…
Dive/Surface Valve (DSV)
The DSV has been completely redesigned from the ground up for exceptionally low work of breathing in the most compact design possible. Two high-performance mushroom valves are used to ensure…
Automatic Diluent Addition Valve (ADV)/Manual Addition Valve (MAV)
The ADV/MAV is mounted to the side of the inhalation counterlung. It utilizes a built-in demand valve that is activated by negative loop pressure against a diaphragm, similar to a…
Oxygen Manual Addition Valve (MAV)
The oxygen manual addition valve is a dry-suit style, side push valve. It uses a standard LP inflator hose connector. The valve allows the manual addition of oxygen and also…
Overpressure/Dump Valve (OPV)
The O2ptima CM uses a special loop overpressure valve (OPV) located on the exhalation (right) counterlung. A specific spring is used to optimize the cracking pressure for rebreather counterlung use.…
Scrubber Canister
The scrubber canister contains the scrubbing media that removes CO2 from the breathing loop. The Optima CM uses an axial style scrubber canister and can be used with either Micropore…
Scrubber End Cap & Water Trap
The scrubber end cap contains a snap-in water trap in the shape of a cone. This shape prevents excess water from entering the scrubber canister regardless of the diver’s position…
Electronics Head
The electronics head contains the solenoid, oxygen sensors (4), sensor disk, sensor wiring harness, and oxygen injection premix tube. These components are responsible for analyzing the oxygen content of the…
Oxygen Sensors
The Optima CM uses four oxygen sensors. These sensors are threaded into the sensor disk mounted inside the electronics head. Dive Rite uses Analytical Industries, Inc. type R22D sensors. Oxygen…
Controller
Dive Rite has chosen to use Shearwater electronics to control and monitor the Optima CM. The controller is a DiveCAN Petrel 3 handset. The controller allows diver control of the…
Electronics/Battery Canisters
There are two external electronics & battery canisters on the Optima CM. They are mounted between the scrubber canister and the counterlungs in elastic sleeves on the bottom of the…
HUD
The Optima CM includes a Shearwater HUD (Heads-Up Display). The HUD displays the PPO readings of oxygen sensors 1, 2, and 3H. These values are displayed using three columns of…
Regulator, Hoses, & Gauge
A Dive Rite first stage with DIN connector and hose assembly is included for the oxygen supply. First stage intermediate pressure (IP) is set to 85 psi for the oxygen…
Cylinders & Valve
The base Optima CM does not include an oxygen cylinder, however they are available. Dive Rite recommends an aluminum 13 cf (2L) cylinder for on-board oxygen use. The diver may…