Dive Rite O2PTIMA CM Manuale utente

October 2020 – Rev C

USER MANUAL

www.diverite.com

October 2020 © Lamartek, Inc. dba Dive Rite 2

This is the user manual for the Dive Rite O2ptima CM eCCR rebreather.

This user manual is proprietary and copyright Lamartek, Inc. 2020. It may not be reproduced, changed,

or distributed without authorization from Lamartek, Inc.

All information contained in this manual has been carefully reviewed and is believed to be accurate,

however it is subject to change. Rebreather technology is constantly and rapidly evolving. Please check

www.diverite.com to ensure that you have the latest version of this manual.

Companies and/or product names cited in the manual are trademarks belonging to their respective

companies.

The O2ptima CM is manufactured in the USA by:

Lamartek, inc. dba Dive Rite

175 NW Washington Street

Lake City, FL, 32055 USA

Phone (386) 752-1087

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October 2020 © Lamartek, Inc. dba Dive Rite 3

General Safety Statements and Warnings

 DO NOT use the O2ptima CM without successfully completing an O2ptima

CM specific training program. Training on previous versions of the back-

mounted O2ptima is not sufficient for diving the O2ptima CM.

 DO NOT use the O2ptima CM without reading and understanding this

manual in its entirety.

 Reading this user manual DOES NOT replace unit specific training. This

manual does not provide directions for diving with closed circuit rebreather

equipment. This manual is only intended to be a guide for the proper

maintenance, setup, operation, and basic service of the O2ptima CM

rebreather.

 As with any piece of equipment, this rebreather will eventually fail. Even

careful maintenance, assembly, and testing will not prevent this from

happening. It is possible that any part of this unit may fail at any time.

Because of this, it is essential that a separate, independent bailout system

be taken by the diver on every dive. The bailout system must be configured

to allow safe termination of the dive and return to the surface in the event

of a malfunction at any point during the dive.

 All components of the rebreather must be in good working order and be

carefully maintained, assembled, and tested to reduce the risk of failure.

 Participation in rebreather diving can result in serious injury or death.

These risks can be reduced, but never eliminated.

 Knowledge and training are the best tools for avoiding accidents.

 Rebreather diving is a physically as well as mentally demanding activity.

 If you do not have adequate training, equipment, physical conditioning, and

proper mind-set, do not get in the water.

 As the diver, YOU have the final responsibility for your own actions and

safety while using this rebreather.

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October 2020 © Lamartek, Inc. dba Dive Rite 4

Table of Contents

General Safety Statements and Warnings .................................................................................................. 3

Introduction .................................................................................................................................................. 6

Design Philosophy ........................................................................................................................................ 6

System Overview .......................................................................................................................................... 7

The Breathing Loop ...................................................................................................................................... 8

Component Features & Functions ............................................................................................................... 9

Counterlungs .................................................................................................................................... 9

Breathing Hoses & Fittings ............................................................................................................... 9

Dive/Surface Valve (DSV) ................................................................................................................. 9

Automatic Diluent Addition Valve (ADV)/Manual Addition Valve (MAV) ..................................... 10

Oxygen Manual Addition Valve (MAV) .......................................................................................... 10

Overpressure/Dump Valve (OPV) .................................................................................................. 10

Scrubber Canister ........................................................................................................................... 11

Scrubber End Cap & Water Trap .................................................................................................... 11

Electronics Head ............................................................................................................................ 12

Oxygen Sensors .............................................................................................................................. 12

Controller ....................................................................................................................................... 13

Electronics/Battery Canisters......................................................................................................... 13

HUD ................................................................................................................................................ 14

Regulator, Hoses, & Gauge ............................................................................................................ 14

Cylinders & Valve ........................................................................................................................... 15

Micropore ExtendAir Cartridge Overview ................................................................................................. 16

Assembling the O2ptima CM ..................................................................................................................... 18

Importance of Checklists................................................................................................................ 18

Gas Analyzation .............................................................................................................................. 18

Installing the Water Trap Tubes ..................................................................................................... 18

How to Install a Micropore ExtendAir Cartridge ............................................................................ 19

How to Pack the Scrubber ............................................................................................................. 20

Installing the Scrubber End Cap & Water Trap .............................................................................. 23

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Installing the Electronics Head ....................................................................................................... 24

Installing the Scrubber Assembly ................................................................................................... 26

Mounting the Electronics/Battery Canisters ................................................................................. 27

Installing the Loop Hoses ............................................................................................................... 27

Installing the DSV ........................................................................................................................... 28

Installing the Oxygen Cylinder, Regulator and Hoses .................................................................... 29

Basic Operation & Use ............................................................................................................................... 32

Harness Attachment ...................................................................................................................... 32

Oxygen Sensor Calibration ............................................................................................................. 32

DSV Operation ............................................................................................................................... 33

Breathing on the Loop ................................................................................................................... 33

Electronic vs Manual Operation .................................................................................................... 34

Diluent Injection............................................................................................................................. 35

Servicing, Maintenance, & Cleaning .......................................................................................................... 35

Post Dive Procedures & Cleaning ................................................................................................... 35

Oxygen Sensor Care ....................................................................................................................... 36

Oxygen Sensor Replacement ......................................................................................................... 38

Battery Replacement ..................................................................................................................... 40

Battery Recommendations ............................................................................................................ 41

Storage ........................................................................................................................................... 41

Annual Service ............................................................................................................................... 42

Recommended Care Products ....................................................................................................... 42

Technical Specifications ............................................................................................................................. 42

Revisions & Changes in Documentation .................................................................................................... 44

Appendix I: Checklists ............................................................................................................................... 44

Assembly Guide Checklist .............................................................................................................. 45

Survival Checklist ........................................................................................................................... 46

Pre-flight Checklist ......................................................................................................................... 47

Post Dive Checklist ......................................................................................................................... 48

Appendix II: Galvanic Oxygen Sensors Applied to Closed Circuit Rebreathers ...................................... 49

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October 2020 © Lamartek, Inc. dba Dive Rite 6

Introduction

Congratulations on your purchase of the O2ptima CM rebreather! First produced in late 2005, the

O2ptima has been a leader in the rebreather market for over a decade. During that time it has been

used for cutting edge exploration and world class expeditions all over the planet. Dive Rite has made a

strong commitment to ensuring that it is one of the most reliable, capable, and high performing

rebreathers on the market. The O2ptima design continues to evolve as refinements are made and new

technology becomes available. The O2ptima CM represents the next generation of O2ptima design. The

chest mounted configuration provides the advanced diver with new and unique opportunities for diving

exploration. We are certain that this unit will provide you with many unforgettable hours exploring your

underwater world.

Design Philosophy

The design parameters for the O2ptima were simple:

 Keep the breathing loop as short as possible

 Use proven, state of the art electronics

 Be fully compatible with the Micropore ExtendAir cartridge

 Maintain a rugged and durable package in the smallest profile possible

These parameters were originally chosen in order to produce a rebreather ideally suited to underwater

cave exploration. The unique challenges of the cave environment demanded a unit that was as safe and

reliable as possible while maintaining a minimal profile. The end result was a rebreather that is not only

highly suitable for cave diving, but also any other type of technical diving where a direct ascent to the

surface is not always possible.

By utilizing a horizontally mounted scrubber canister, the breathing loop was kept as short as possible.

This helps to create the lowest possible work of breathing and allows the use of smaller diameter loop

hoses. This in turn increases comfort and reduces diver fatigue. Internal water traps located in the

counterlungs and canister end cap, combined with the use of the Micropore ExtendAir cartridge, greatly

reduce the possibility of a “caustic cocktail.”

The O2ptima CM utilizes Shearwater electronics for their proven and unparalleled reliability and

functionality.

At Dive Rite, we understand that one size does not fit all, so in addition to the standard O2ptima CM

features there are a number of options to ensure a proper fit for any diver and mission. Contact Dive

Rite or visit www.diverite.com for more details.

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October 2020 © Lamartek, Inc. dba Dive Rite 7

System Overview

The O2ptima CM is a chest mounted electronically controlled, constant PPO2, fully closed circuit

rebreather (eCCR). It has built-in decompression calculation and mixed gas capabilities. The following

features come standard on the unit:

 Chest mounted counterlungs with 6 Liter total loop volume

 Redundant Shearwater DiveCAN electronics including heads-up display (HUD) and Petrel 2

controller (NERD controller optional)

 Dual use scrubber canister design that can be used with Micropore ExtendAir cartridges or

packed with loose CO2 absorbent

 Dive Rite DSV is standard

 Dual water traps in the counterlungs and scrubber lid

 Oxygen Regulator and hoses

 (4) AI or AST R22 Oxygen Sensors

 Sturdy outer cover utilizing abrasion resistant Rhinotek® fabric

 AL 13 oxygen cylinder with valve (optional)

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October 2020 © Lamartek, Inc. dba Dive Rite 8

The Breathing Loop

The O2ptima CM incorporates a chest mounted, dual counterlung design. The breathing loop consists of

the DSV, breathing hoses and hose fittings, inhalation and exhalation counterlungs, scrubber canister,

canister end cap, and electronics head. Gas flows from the diver—to the right counterlung—through the

scrubber canister—to the left counterlung—back to the diver.

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October 2020 © Lamartek, Inc. dba Dive Rite 9

Component Features and 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 diver

positions.

The counterlungs consist of an abrasion resistant outer

bag and removable welded polyurethane inner bladders.

The bladders are accessible through a zipper on the back

side of the outer bag.

The bottom side of the counterlungs attach directly to

the scrubber canister. The breathing loop hoses attach to the sides of the counterlungs using threaded

connections.

The exhalation counterlung has an overpressure/dump valve located at the bottom of the lung. An

internal water trap is located in the bottom of the exhalation counterlung to make de-watering the loop

easy.

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 the industry. This not only keeps the work of breathing low, but also

reduces drag and uncomfortable vibrations occasionally encountered with

excessive hose lengths when scootering or swimming against strong flow.

The hoses have threaded fittings attached to the counterlung ends. Each fitting

utilizes a double O-ring seal to help ensure loop integrity. The hoses are 12

inches in length standard. Other sizes are available for improved fit on smaller

divers.

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 proper one way gas travel.

The lever on the front of the DSV is used to open the DSV for

diving and close the DSV on the surface or during a bailout

procedure to prevent water from entering the loop. The DSV

utilizes a friction seal between the outer body and the inner

barrel so there are no O-rings to wear out or replace on the barrel.

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October 2020 © Lamartek, Inc. dba Dive Rite 10

The DSV uses a bayonet style quick lock system to attach the hoses. To remove, simply press in the

spring loaded white locking button and turn the connector ring 1/8 turn counterclockwise. The hose can

then be pulled free. This feature allows fast and easy inspection of the mushroom valves and cleaning

and maintenance.

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 in the same

manner as a standard second stage regulator. It can also be

manually activated by pressing directly on the diaphragm.

The ADV’s position allows it to feed diluent gas directly to the

DSV. This provides a fast, hands-free method of receiving a

known breathable gas as well as supplying additional gas to increase loop volume.

The ADV/MAV comes with a standard LP inflator hose fitting to allow the use of any off-board diluent

gas supply. For dives exceeding 130ft/40m, Dive Rite recommends upgrading this fitting to a high flow

quick disconnect QC-6 fitting. Contact Dive Rite for details.

An inline shutoff is included to disable the ADV, however be aware that this also disables the MAV.

The shutoff should also be used if the diluent gas supply is disconnected underwater to prevent water

from entering the ADV/MAV.

The base of the ADV/MAV is screwed into a welded flange on the counterlung inner bladder.

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 permits the use of on-board as

well as off-board gas supplies.

The oxygen manual add valve is located on the exhalation (right)

counterlung. The valve is screwed into a welded flange on the

counterlung inner bladder.

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.

Do not replace with a standard drysuit exhaust valve as they can have a much higher cracking pressure

which can lead to lung overexpansion injuries.

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