Mares OCTOPUS MV Instruction Manual

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REGULATORS

OCTOPUS MV

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WARNING

CAREFULLY READ THIS INSTRUCTION MANUAL BEFORE USE, AND KEEP IT FOR FUTURE REFERENCE.

INTRODUCTION

Congratulations on your purchase of a Mares regulator. This product is part of Mares’s new family of advanced high performance
underwater life support system. It is designed, manufactured and tested by experienced divers.
For over 40 years, Mares has been an industry leader in dive innovation and technology. The modular of regulators have several key
features for your diving comfort.

Important:

Any critical information or warnings that might affect the performance or result in the injury or death of the technician, regulator owner, or
other persons is highlighted with the following symbols:

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DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

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WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

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CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be
used to alert against unsafe practices.

MARES reserves the right to modify any products, processes and manufacturing techniques at any time. It is the technicians' responsibility
to acquire the latest information and parts from MARES for service and repairs to be performed.

IMPORTANT:

If the instructions provided in the manual are unclear or difficult to understand, please contact MARES before using the regulator or
attempting any repairs.

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WARNING

Carefully follow these and all the other instructions concerning your MARES regulator and all other SCUBA equipment.
Failure to do so could lead to serious injury or death.

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WARNING

As with all SCUBA equipment, MARES regulators are designed to be used by trained, certified divers only. Failure to fully
understand the risks of using such equipment may result in serious injury or death. DO NOT use this regulator or any
SCUBA equipment unless you are a trained, certified MARES diver.

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EC CERTIFICATION

The MARES regulators described in this manual have been tested and certified by Registered Test Centre No. 0426 - Italcert - Viale Sarca
336, Milano - I, in compliance with EC directive 89/686/EEC of 21 December 1989. The test procedures were conducted according to
the EN 250: 2000 standard, in conformance with the aforesaid directive which sets out the conditions for marketing and essential safety
requirements for Category III Personal Protective Equipment (PPE).
The certification testing results are the following:

Model

Warm water Cold Water Marking Position

(Temp. = > 10°C) (Temp. < 10°C)
Octopus MV approved approved CE 0426 on the hose

The CE0426 marking for Octopus MV is an adhesive label affixed to the hose. This label must not be removed.
The CE markings indicate that the product is compliant with the essential health and safety requirements (Att. II DE 89/686/CEE). The
suffix 0426 after the letters “CE” indicates the Italcert Registered Test Center in charge of monitoring the production under Art. 11B DE
89/686/EEC.

REFERENCES TO EN 250: 2000 – OBJECT – DEFINITIONS – LIMITS

Object: The requirements and tests provided for in EN 250: 2000 are aimed at providing a minimum safety level for the operating of diving

breathing apparatuses at a maximum depth of 50m/162 feet.

Scuba – Definition: Self-contained, open-circuit compressed air underwater breathing apparatus, equipped with an air cylinder
Scuba – Minimum equipment (EN 250: 2000):

a) Air cylinder / cylinders.
b) Regulator.
c) Safety device, e.g. pressure gauge / computer or reserve or alarm.
d) Carrying frame or holding device, e.g. backpack and/or strap.
e) Facepiece (mouthpiece assembly or full face mask or diving helmet).
f) Operating instructions.

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WARNING

SCUBA equipment complying with EN 250 is not intended for breathing by more than one user at the same time.

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WARNING

If SCUBA equipment is configured and used by more than one diver at the same time, the cold water and breathing
performance may not fulfill the requirements of EN 250.

Limits (EN 250: 2000)

- SCUBA – Component units (EN 250: 2000):

The SCUBA equipment may consist of separate component units such as cylinders,
regulator and pressure gauge. The MARES regulators described in this manual can be used with other SCUBA unit components
certified according to directive EEC/89/686 and EN 250: 2000. The air inside the tanks must conform to the requirements for breathable
air set out in EN12021.

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DANGER

MARES regulators and octopus are designed and intended for use only with clean, compressed atmospheric air. Do not
use this equipment with any other gas.
Failure to adhere to this warning may result in serious injury or death due to fire and explosion or the serious deterioration
or failure of the equipment.

- Maximum depth: 50 m/162 feet.

- Warm water regulators – water temperature over or equal to +10°C (50°F).

- Cold water regulators – water temperature below +10°C (50°F).
In accordance with standard EN 250: 2000, cold water is that at temperatures below 10°C.
To use MARES regulators in cold water conditions, always install the CWD (Cold Water Diving) kit. THE CWD KIT SHOULD ONLY BE

INSTALLED BY AN AUTHORIZED MARES SERVICE CENTER.

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WARNING

Attempting to dive in cold water conditions (10°C or less) without adequate training may result in serious injury. Before diving
in cold water, it is advisable to take a special training course under the supervision of a certified diving instructor. Because no
regulator can be completely guaranteed against freezing of the second stage under all conditions, even MARES regulators
fitted with the CWD kit may be subject to “icing” phenomena. In this event, regulators may not function properly. This may
result in serious injury. Therefore, to minimize the potential hazards, it is essential to be adequately trained in the prevention
and handling of the problems which may arise from a regulator subject to “icing” phenomena.
Particularly in these situations, the following precautions should be observed:

1) Avoid breathing from the regulator outside the water.

2) Never operate the purge button when not underwater.

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WARNING

For safety reasons, it is not advisable to use an Octopus second stage that is not a certified MARES Octopus. The
manufacturer declines responsibility for damages to persons or property resulting from the use of different Octopus
second stages. The MARES Octopus second stages have been designed and tested for use on first stage low pressure
ports OTHER than the preferential port used for the primary second stage.

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WARNING

For safety reasons, the submersible pressure gauge / high pressure safety device to be assembled on the regulator must
comply with the standard EN 250: 2000. According to this regulation, with an upstream pressure of 100 bar, the maximum
permitted airflow through the connector toward the first stage must not exceed 100 liters/min. If you have a submersible
pressure gauge / high pressure safety device that complies with the EN 250:1993 standard or a different specification,
check whether the instruction manual indicates the value of the maximum airflow.
The use of submersible pressure gauges / safety devices that do not comply with the EN 250: 2000 standard, or which do
not have an indication of the maximum permitted airflow through the first stage connector, may result in serious accidents.

GENERAL WORKING PRINCIPLE

Regulators reduce cylinder pressure, referred to as inlet pressure, to a pressure suitable for breathing. Modern regulators do this in two
stages connected by a hose. The first stage provides pressure to the second stage; this reduced pressure remains constant despite the
sizeable changes undergone by the cylinder inlet pressure during the dive (dropping from 3000/4350 to few hundred psi). The second
stage brings pressure down to ambient pressure and delivers air only when the diver inhales. Each stage of the regulator contains an
internal valve. When a pressure imbalance is created inside the respirator due to a withdrawal of air by the diver (beginning of inhalation),
the valves open and allow air to flow until the pressure balance is restored (end of inhalation).

FIRST STAGE

For the second stage to work properly, the first stage must deliver air at a correct and – most importantly – constant intermediate pressure.
This characteristic, provided by all MARES first stages, is essential for obtaining optimal adjustment of the second stage and ensuring top
performance for the entire duration of the dive, regardless of tank pressure. All MARES first stages are available with the following types
of tank valve fittings: international YOKE CGA 850 adapter (max pressure 232 bar), or DIN 477/50 connector (max pressure 300 bar), in
accordance with the standard EN 250: 2000.

SECOND STAGE

The purpose of the second stage is to deliver air at ambient pressure, only during the inhalation phase. When the diver inhales, the pressure
inside the second stage decreases, creating a pressure difference (imbalance) between the two sides of the diaphragm. This pulls the flexible
diaphragm inward, pressing the demand lever and unseating the second stage valve. This opening allows air to flow in through the second stage
and to the diver, until the diver stops inhaling. At this point the internal second stage pressure increases, pushing the diaphragm back in the
opposite direction, causing the valve to return to its seat and shutting off the airflow.

Octopus MV Second stage (Fig.1)

Octopus MV is based on the VAD patent (A), the famous integrated by-pass.
It immediately led to a compact and streamlined shape, a natural extension of the hose.
Consequently, the exhaust tee (B) is laterally opposed to the supply hose (C). The ergonomic advantage is immediate: a perfectly
symmetrical octopus second stage that can be used on either side.
The wide diameter of the exhaust valve (D) guarantees optimal exhalation effort.
The cover (E) is very streamlines and is secured using three stainless steel screws on the front (F) tightened into metallic inserts.
The seal on the diaphragm (G) isn’t frontal, but radial, which is much more reliable.
Using the Octopus MV second stage is a pleasure.
The reduced weight offers superior comfort without straining the jaw muscles.
Performance, certified by the CE-EN 250: 2000 regulations, ensures minimal breathing effort even in extreme conditions.
Thanks to the updated VAD, breathing is entirely natural.
Every detail has been meticulously crafted and tested to wed the highest possible quality with simple functionality.
The MV octopus positions itself ideally on the BC, and is immediately in the perfect position for use.
The option to use it freely on either side makes it especially versatile.

Integrated V.A.D. system

The Octopus MV second stage uses the integrated V.A.D. (Vortex Assisted Design) system. This system guarantees a low breathing effort
at any depth, so that as the air from the hose passes through the second stage valve, it is routed directly to the mouthpiece via the by-pass
tube (Fig. 1). Inside the latter there is a depression which helps hold down the second stage diaphragm during inhalation, thus increasing
the sensitivity of the regulator. The V.A.D. system also improves performance during dives in especially cold water (colder than 10°C / 50°F).
In fact, with the V.A.D. system, the expansion of air in the second stage occurs inside a by-pass tee and in the mouthpiece, away from the
second stage valve/lever, thus lowering the risk of ice forming.

NBS System (patented)

The Octopus MV second stage uses the new NBS (Natural Breathing System).
The introduction of a new patented system allows breathing to be more comfortable, that has been made possible throught countless tests and
research.
A special spiral-shaped insert is placed inside the by-pass tube (Fig. 1 – A). With such a special insert, airflow can be adjusted, making breathing
more natural under any condition.