Dive Rite O2ptima Owner's Manual download pdf (Page 14)

Dive Rite

Ch. 2 Pg. 2

are RED in color. The hose fittings on the exhalation side of the loop are right-handed fittings,

tighten clockwise, and are BLACK in color.

Counter-lungs

The O2ptima uses two detachable over-the-shoulder (OTS)

counter-lungs. This configuration offers the best breathing

characteristics in all possible positions, allows an individual diver

to adjust the counter-lung for optimal positioning, and allows for

easy cleaning and care.

The Inhalation counter-lung has a fitting for the ADV and a

manual diluent addition valve, while the exhalation counter-lung

has a fitting for a T-Piece, a manual oxygen addition valve and an

over-pressure/exhaust valve. The counter-lungs are secured to the

top of unit by fastex type quick disconnects and use opposite

connectors to prevent improper installation. The inhalation

counter-lung uses a male connector and is positioned on the diver’s left while the exhalation

counter-lung uses a female connector and is positioned on the diver’s right. The counter-lungs

are secured to the harness by velcro straps located on the underside and use a quick disconnect

positioned on the bottom of each counter-lung to keep the counter-lung against the diver’s body.

The counter-lungs must be properly secured and flush with the diver’s body otherwise increased

breathing resistance (CO retention) will result.

Counter-Lung Fittings

The fittings on the counter-lungs use the same color coding and

threading scheme as used on the hose connectors, ADV and T-

Piece. These fittings feature 2 easily inspected o-rings at the

ADV/T-Piece connection for redundancy, and a single o-ring seal

in the counter-lung for reliable sealing between the counter-lung

and the fitting.

T-Piece

The T-Piece is used to connect the exhalation counter-lung to the

canister and to the DSV exhalation hose. The T-Piece has an

internal baffle to prevent direct gas or water flow from the DSV to

the canister. All gas and water exiting the DSV is forced into the

exhalation counter-lung before proceeding to the canister. The

color coding is BLACK for the exhalation side and tightens

clockwise. The Some rebreathers have the T-Pieces permanently mounted to the counter-lung

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Dive Rite O2ptima Owner's Manual Page 14