Suunto COBRA Manuel utilisateur

Arrows:

- Decompression Stop at the Ceiling Depth

- Mandatory Safety Stop Zone

- Ascent Recommended

- Must Descend

QUICK REFERENCE GUIDE

bar psi

°C

MAXAVGPO2

NO DEC TIME

STOP

AIR TIME

TIME

SURF

DIVE

O2% ASC TIME

CEILING

QUIT

SELECT

OPTIONS

OLF

DIVE

°C

bar

Low Battery Warning

Cylinder Pressure

Temperature

Week Day

Mode Text

Personal Adjustment Mode

Do Not Fly Icon

Bar Graph:

- Mode Indicator

- Consumed Bottom Time

- Oxygen Limit Fraction

Bar Graph:

- Ascent Rate Indicator

- Battery Power Indicator

- Logbook Page Indicator

Present Depth Dive Counter

Plan Button

Scroll Button (increase value, ascend)

Remaining Air Time /

Oxygen Percentage in Nitrox Mode

Current Time Display

Surface Interval Time

No Flying Time

No-Decompression Time

Total Ascent Time

Safety Stop Time

Dive Time

Time

Month,Day

The Smart Button:

- Activation

- Backlight

- Mode Operations

Maximum Depth

Ceiling Depth on Decompression Stop

Mandatory Safety Stop Depth

Average Depth in Logbook

Oxygen Partial Pressure

AM/PM Indicator

Altitude Adjustment Mode

Bookmark Symbol

Daily/DiveTime/Depth Alarm

On Indicator

Diver Attention Symbol

Smart Button

Indicators

Scroll Button

Indicators Time (alternative display) Button

Scroll Button (decrease value, descend)

Fast Ascent Warning

(SLOW)

Safety Stop Warning

Safety Stop Indicator

1. INTRODUCTION

Congratulations on your purchase of the SUUNTO COBRA advanced dive

computer. The Cobra builds on the Suunto tradition of delivering feature-rich

dive computers. The Cobra provides many new and enhanced features that

cannot be found in any other air-integrated dive computer. Push button controls

access a wide selection of choices. The display is optimized for the dive mode

chosen. This air-integrated dive computer is a compact and sophisticated

multipurpose dive instrument, designed to give you years of trouble-free service.

CHOICE OF OPERATING MODES AND SET-UP OPTIONS

User options for the Cobra are selected using the push buttons. Pre Dive

configuration and setup options include:

•Choice of operating mode - Air / Nitrox / Gauge

•Choice of unit - Metric / Imperial

•Maximum depth alarm

•Dive time alarm

•Backlight settings

•Clock, calendar, daily alarm

•Mix Oxygen fraction % (Nitrox mode only)

•Maximum PO2(Nitrox mode only)

•Altitude adjustment

•Personal adjustment

CONTINUOUS DECOMPRESSION WITH SUUNTO RGBM

The Suunto Reduced Gradient Bubble Model (RGBM) utilized in the Cobra

predicts both dissolved and free gas in blood and tissues of divers. It is a

significant advance on the classic Haldane models, which do not predict free

gas. The advantage of Suunto RGBM is additional safety through its ability to

adapt to a variety of situations and dive profiles.

In order to optimize how to respond to different added risk situations an

additional category of stop, referred to as a Mandatory Safety Stop, has been

introduced. Also a countdown for the Recommended Safety Stop is included.

The combination of stop types will depend on the specific dive situation.

To get the most from the safety benefits be sure to read the summary of the

Suunto Reduced Gradient Bubble Model on page 62.

1.1. SAFETY PRECAUTIONS

Do not attempt to use the dive computer without reading this instruction manual

in its entirety, including all the warnings. Make sure that you fully understand

the use, displays and limitations of the instrument. If you have any questions

about the manual or the dive computer, contact your SUUNTO dealer before

diving with the dive computer.

Always remember that YOU ARE RESPONSIBLE FOR YOUR OWN SAFETY!

When used properly, the dive computer is an outstanding tool for assisting

properly trained, certified divers in planning and executing sport dives. It is

NOT A SUBSTITUTE FOR CERTIFIED SCUBA INSTRUCTION, including

training in the principles of decompression.

Diving with enriched air mixtures (nitrox) exposes the user to risks different

from those associated with diving with standard air. These risks are not obvious

and require training to understand and avoid. Risks include possible serious

injury or death.

Do not attempt to dive with any gas mix other than standard air without first

receiving certified training in this specialty.

1.1.1. EMERGENCY ASCENTS

In the unlikely event that the dive computer malfunctions during a dive, follow

the emergency procedures provided by your certified dive training agency or,

alternatively,

STEP 1: Assess the situation calmly and then move promptly to less than 18 m

[60 ft].

STEP 2: At 18 m [60 ft], slow down your ascent rate to 10 m/min [33 ft/min] and

move to a depth between 3 and 6 meters [10 to 20 ft].

STEP 3: Stay there as long as you assess your air supply will safely allow.

After reaching the surface stay out of the water for at least 24 hours.

1.1.2. DIVE COMPUTER LIMITATIONS

While the dive computer is based on current decompression research and

technology, you must realize that the computer cannot monitor the actual

physiological functions of an individual diver. All decompression schedules

currently known to the authors, including the U.S. Navy Tables, are based on

theoretical mathematical models, which are intended to serve as a guide to

reduce the probability of decompression illness.

1.1.3. NITROX

Diving with nitrox provides the diver with an opportunity to reduce the risk of

decompression illness by reducing the nitrogen content in the breathing gas

mix.

However, when the gas mix is altered, the oxygen content of the mix is generally

increased. This increase exposes the diver to an oxygen toxicity risk not usually

considered in recreational diving. In order to manage this risk, the dive computer

tracks the time and intensity of the oxygen exposure and provides the diver

with information to adjust the dive plan in order to maintain oxygen exposure

within reasonably safe limits.

In addition to the physiological effects of enriched air on the body there are

operational considerations to be addressed when handling altered breathing

mixes. Elevated concentrations of oxygen present a fire or explosion hazard.

Consult with the manufacturer of your equipment in regards to its compatibility

with nitrox.

2. GETTING ACQUAINTED

2.1. FUNCTIONS

You can select the dive computer model between the Regular Air Dive Computer,

Nitrox Dive Computer and Depth Gauge with Timer mode.

The COBRA multipurpose dive computer is an air integrated computer featuring

three dive computer modes (AIR, NITROX, GAUGE), three main operating

modes (TIME/STAND-BY, SURFACE, DIVING), three menu based main modes

(MEMORY, SIMULATION, SET) and 16 - 18 menu based submodes (review

separate Quick Reference Guide). You can scroll through the modes using the

push buttons. The mode indicator at the left side and the mode text at the

bottom of the display indicate the selected mode.

The timekeeping display is the default display of the instrument (Fig. 2.1.). If a

button is not pressed within 5 minutes, the dive computer beeps and returns to

the timekeeping display automatically (except in Diving and Simulation modes).

The timekeeping display shuts off after two hours, but pressing the PLAN or

TIME button activates it.

2.2. CONNECTINGTHE COBRATOA REGULATOR

Upon purchasing the Cobra, Suunto strongly recommends you have your

dealer attach it to the first stage of your regulator.

If you decide to attach it yourself, follow the steps outlined below:

1. Remove the high pressure (HP) port plug on the first stage of your

regulator using an appropriate sized wrench.

2. Thread the high pressure hose of the Cobra into the port of your

regulator with your fingers. Tighten the hose fitting with a 16 mm

[5/8"] wrench. DO NOT OVERTIGHTEN!

3. Attach the regulator to a charged scuba cylinder. Slowly open the

valve. Check for leaks by submerging the first stage regulator in

water. If leaks are detected, consult your dealer.

2.3. PUSH BUTTONS

The dive computer has easy-to-use push buttons and an advisory display,

which guides the user. The SMART (MODE) button is the key to the system.

The two scroll buttons, PLAN and TIME, are used for scrolling up and down

the menus and to show the alternative displays. The dive computer is controlled

with these three push buttons as follows (see Fig. 2.2.).

Press the SMART (MODE) button

•To activate the dive computer.

•To change from the Surface Mode to the menu based modes.

•To select, confirm or quit a submode (short press).

•To immediately exit any submode to the Surface Mode (long press).

•To activate the electroluminescent backlight (in the Surface Mode

hold down the mode button for more than two (2) seconds, during a

dive for one (1) second).

Press the arrow up scroll (PLAN) button

•To activate the timekeeping display, if the display is blank.

•To activate the Dive Planning in the Surface Mode.

•To make a special bookmark in the profile memory during a dive.

•To scroll up the options (L, increase).

Press the arrow down scroll (TIME) button

•To activate the timekeeping display, if the display is blank.

•To activate the Time display(s) and/or alternative display(s).

•To scroll down the options (M, decrease).

The dive computer is controlled with the SMART (MODE/On/Backlight/

Select/OK/Quit) and the PLAN Land TIME Mpush buttons and with the

water contacts as follows:

Activation press the SMART (On) button or immerse the instrument in

water for five (5) seconds.

Dive Planning in the Surface Mode, press the PLAN button.

Menu Modes press the SMART (MODE) button.

The display is illuminated by holding down the SMART button for more than

two seconds.

2.4.WATER CONTACTS

The water contacts control the automatic activation

of the Dive Mode.

The water and data transfer contacts are located on

bottom of the case (Fig 2.3.). When submerged the

water contacts are connected to the push buttons

(which are the other pole of the water contact) by the

conductivity of the water. The "AC" text (Active

Contacts, Fig. 2.4.) will appear on display. The AC

text will be shown until the water contact deactivates

or the dive computer enters the Dive Mode

automatically.

Fig. 2.1. Time keeping display.

Pressing PLAN or TIME

button activates display.

Fig. 2.2. Push buttons of the

dive computer.

Fig 2.3. Depth sensor (A),

water/data transfer contacts (B).

Fig. 2.4. Active water contacts

are indicated by the text AC.

The SMART button

The PLAN, TIME and

SCROLL buttons

MAXAVGPO2

NO DEC TIME

STOP

TIME

SURF

DIVE

O2%

ASC TIME

CEILING

QUIT

SELECT

OPTIONS

OLF

DIVE

AIR

bar

3. DIVING WITH THE COBRA

This section contains instructions on how to operate

the dive computer and interpret its displays. You will

find that this dive computer is easy to use and read.

Each display shows only the data relevant to that

specific diving situation.

3.1 BEFORE DIVING

3.1.1. ACTIVATION AND PRECHECKS

The dive computer will activate if submerged deeper

than 0.5 m (1.5 ft). However, it is necessary to turn on

the Dive Mode before diving to check the cylinder

pressure, altitude and personal adjustment settings,

battery condition, oxygen settings etc. Press the

SMART (On) button to activate the instrument.

After activation all display elements will turn on

showing mostly figure 8's and graphical elements (Fig.

3.1.). A few seconds later the battery power indicator

is shown and the backlight and the buzzer are

activated (Fig. 3.2. display a, b, c or d depending on

the battery voltage). If set to Air mode the screen will

enter the Surface mode (Fig. 3.3.). If set to Gauge

mode the text GAUGE is shown (Fig. 3.4.) and if set to

Nitrox mode the essential oxygen parameters are

shown with the text NITROX (Fig. 3.21.) before the

Surface mode.

At this time, perform your precheck making sure that:

• the instrument operates in the correct mode

and provides a complete display (Air and

Nitrox modes)

• the low battery indicator is not on

• the altitude and personal adjustment

settings are correct

• the instrument displays correct units of

measurement (Metric/Imperial)

• the instrument displays correct temperature

and depth (0.0 m [0 ft])

• the buzzer beeps

Fig. 3.1. Startup I. All

segments shown.

Fig. 3.2. Startup II. Battery

power indicator.

QUIT

•you have enough air for your planned dive. You should also check

the pressure reading against your back-up pressure gauge.

And if set to Nitrox mode, make sure that:

•the oxygen percentage is adjusted according to the measured Nitrox

blend in your cylinder

•the oxygen partial pressure limit is set correctly.

The dive computer is now ready for diving.

3.1.2. BATTERY POWER INDICATOR AND LOW

BATTERY WARNING

This dive computer has a unique graphic Battery Power Indicator designed to

give you an advance notice of impending need to change the battery.

The Battery Power Indicator can always be seen when the Dive Mode is

activated. The electroluminescent backlight will be on during the battery check.

The following Table and Figure show the various warning levels.

TABLE 3.1. BATTERY POWER INDICATOR

TIME

DIVE

bar

TIME

DIVE

TIME

bar

Fig 3.3. Startup III. Surface

mode. Depth and dive time are

zero and cylinder pressure is

300 bar [4350 psi]. Pressing

TIME button activates

alternative display of

temperature and current time.

Fig. 3.4. Startup IV. Gauge

mode.

Fig. 3.5. Low Battery Warning.

Battery symbol indicates that

the battery is low and battery

replacement is recommended.

Temperature or an internal oxidation of the battery

affects the battery voltage. If the instrument is stored

for a long period, the low battery warning may be

displayed even though the battery has enough

capacity. The low battery warning may also be

displayed at low temperatures, even though the

battery has enough capacity in warmer conditions.

In these cases repeat the battery check procedure.

After battery check the Low Battery Warning is

indicated by the battery symbol (Fig. 3.5.).

If the battery symbol is displayed in the Surface mode

or if the display is faded or weak, the battery may be

too low to operate the dive computer and battery

replacement is recommended.

NOTE! For safety reasons the backlight cannot be

activated when the low battery warning is indicated

by the battery symbol.

3.1.3. DIVE PLANNING [PLAN]

To enter Planning Mode, press the PLAN button at

any time during Surface Mode. After showing the

text "PLAN" (Fig. 3.6.), the display will show the no-

decompression limit for the depth of 9 m [30 ft]. By

pressing the down arrow (M) TIME button, the dive

computer will calculate and show the next deeper no-

decompression limits in 3 m [10 ft] increments ending

at 45 m [150 ft]. By pressing the up arrow (L) PLAN

button, the next shallower depth will be shown again.

The Planning Mode is cancelled by pressing the

SMART (QUIT) button.

NOTE! The Planning mode is disabled in Gauge mode

and in Error mode (see section 3.9. "Error

Conditions").

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