Suunto Cobra User Manual
  1. Manuals
  2. Brands
  3. Suunto Manuals
  4. Diving Instrument
  5. COBRA
  6. User manual

Suunto Cobra User Manual

Suunto cobra diving instruments: user guide
Hide thumbs Also See for Cobra:
Table of Contents

Advertisement

Quick Links

See also: Instruction Manual , Quick Reference Manual
EN
SUUNTO
COBRA
U S E R ' S G U I D E

Advertisement

Table of Contents
loading

Related Manuals for Suunto Cobra

Summary of Contents for Suunto Cobra

  • Page 1 SUUNTO COBRA U S E R ’ S G U I D E...
  • Page 2 Quick Reference Guide...

  • Page 3: Warnings

    European diving depth gauge standard draft. The COBRA is designed to comply with this draft standard. ISO 9001 SUUNTO Oyj’s Quality Assurance System is certifi ed by Det Norske Veritas to be according to the ISO 9001 in all SUUNTO Oyj’s operations (Quality Certifi cate No. 96-HEL-AQ-220).
  • Page 4 WARNINGS SUUNTO Oyj does not assume any responsibility for losses or claims by third parties, which may arise through the use of this device. Due to continuous product development, the COBRA is subject to change without notice. READ THIS MANUAL! Carefully read this instruction manual in its entirety paying close attention to all warnings listed below, including section 1.1.
  • Page 5 SUUNTO STRONGLY RECOMMENDS THAT SPORT DIVERS LIMIT THEIR MAXIMUM DEPTH TO 40 M [130 FT] OR TO THE DEPTH CALCULATED BY THE COMPUTER BASED ON THE SELECTED O2% AND A MAXIMUM PO2 OF 1.4 BAR SETTINGS! DIVES WITH REQUIRED DECOMPRESSION STOPS ARE NOT RECOMMENDED.
  • Page 6 DO NOT EXPOSE THE COBRA DIVE COMPUTER WITH IT´S STANDARD HOSE TO ANY GAS MIX CONTAINING MORE THAN 40% OXYGEN! Enriched air with greater oxygen content presents a risk of fi...
  • Page 7 WARNING! SET THE CORRECT PERSONAL ADJUSTMENT MODE!, Whenever it is believed that factors that tend to increase the possibility of DCI exist, it is recommended that you use this option to make the calculations more conservative. Failure to select the correct Personal Adjustment setting will result in erroneous dive and planning data.

  • Page 8: Table Of Contents

    1.1.2. Dive Computer Limitations ...9 1.1.3. Nitrox ...10 2. GETTING ACQUAINTED ... 2.1. FUNCTIONS ... 2.2. CONNECTING THE COBRA TO A REGULATOR ... 2.3. PUSH BUTTONS ... 2.4. WATER CONTACTS ... 3. DIVING WITH THE COBRA ... 3.1. BEFORE DIVING ...
  • Page 9 5.5. BATTERY REPLACEMENT ... 5.6. DISPLAY SHIELD REPLACEMENT ... 5.7. COMPASS ATTACHMENT ... 6. TECHNICAL DESCRIPTION ... 6.1. OPERATING PRINCIPLES ... 6.2. REDUCED GRADIENT BUBBLE MODEL, SUUNTO RGBM ... 6.3. OXYGEN EXPOSURE ... 6.4. TECHNICAL SPECIFICATION ... 7. WARRANTY ... 8. GLOSSARY ...

  • Page 10: Introduction

    Recommended Safety Stop is included. The combination of stop types will depend on the specifi c dive situation. To get the most from the safety benefi ts be sure to read the summary of the Suunto Reduced Gradient Bubble Model on page 62.

  • Page 11: Safety Precautions

    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.

  • Page 12: Nitrox

    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.

  • Page 13: Getting Acquainted

    1. Remove the high pressure (HP) port plug on the fi rst stage of your regulator using an appropriate sized wrench. 2. Thread the high pressure hose of the Cobra into the port of your regula- tor with your fi ngers. Tighten the hose fi tting with a 16 mm wrench.

  • Page 14: Push Buttons

    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.

  • Page 15: Water Contacts

    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.

  • Page 16: Diving With The Cobra

    QUIT Fig. 3.2. Startup II. Battery power indicator. 3. DIVING WITH THE COBRA This section contains instructions on how to operate the dive computer and interpret its displays. You will fi nd that this dive computer is easy to use and read. Each display shows only the data relevant to that specifi...

  • Page 17: Battery Power Indicator And Low Battery Warning

    • 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 •...

  • Page 18: Dive Planning [Plan]

    DIVE TIME ° 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 alterna- tive display of temperature and current time. DIVE TIME ° Fig. 3.4. Startup IV. Gauge mode.

  • Page 19: User Defi Nable Functions And Alarms

    (see also section 3.6.2. “Dive Numbering”). 3.1.4. USER DEFINABLE FUNCTIONS AND ALARMS This Cobra has several User Defi nable Functions and depth and time related alarms that you can set according to your personal preference. The dive computer model, unit of measurement and backlight preferences can be set in the MODE- SET- SET PREF submode.

  • Page 20: Safety Stops

    Reasons to perform a safety stop include a reduction in sub clinical DCI, microbubble reduction, ascent control, and orientation before surfacing. The Cobra displays two different types of safety stops: Recommended Safety Stop and Mandatory Safety Stop.
  • Page 21 you correct this situation at any time during that dive, there are no affects on the decompression calculations for future dives. If you continue to violate the Mandatory Safety Stop, the tissue calculation model is affected and the dive computer shortens the available no-decompression time for your next dive.

  • Page 22: Diving In Air Mode

    NO DEC TIME DIVE TIME Fig. 3.7. Dive has just begun and no air time is shown. First estimate of remaining air time will be shown after 30-60 seconds. AIR TIME NO DEC TIME DIVE TIME Fig. 3.8. Diving display. Present depth is 19.3 m [63 ft] and no- decompression stop time limit is 23 minutes in A0/P1 mode.

  • Page 23: Bookmark

    The Bookmarks will also be shown as annotations in the PC-software, Suunto Dive Manager. To make a bookmark on the profi le memory during a dive press the PLAN button (Fig. 3.10.).
  • Page 24 STOP AIR TIME NO DEC TIME DIVE TIME Fig. 3.13. Ascent Rate Indica- tor. Blinking depth reading, SLOW and four segments are shown together with an audible alarm: ascent rate is more than 10 m/min [33 ft/min]. This is a caution to slow down! STOP sign means that you are advised to make a Mandatory Safety Stop when you reach a depth of...

  • Page 25: Consumed Bottom Time (Cbt)

    (lowest) bar graph segment appears. As your body absorbs more nitrogen, more segments start to appear. Green Zone - As a safety precaution Suunto recommends you should maintain the no-decompression bar graph within the green zone. Segments start to appear when the available no-decompression time decreases below 100, 80, 60, 50, 40, 30 and 20 minutes.

  • Page 26: Decompression Dives

    When the maximum allowed ascent rate is exceeded, the fi fth SLOW warning segment and the STOP sign appear and the depth reading starts to blink, indicating that the maximum ascent rate has been exceeded continuously or that the current ascent rate is signifi...
  • Page 27 The ascent time (ASC TIME) is the minimum amount of time needed to reach the surface in a decompression dive. It includes: • the time needed to ascend to the ceiling at an ascent rate of 10 m/min [33 ft/min] plus •...
  • Page 28 Suunto recommends that decompression takes place deeper than 4 m [13 ft], even if the indicated ceiling is shallower.
  • Page 29 DISPLAY ABOVE THE FLOOR When you ascend above the fl oor, the ASC TIME display stops blinking and the upward pointing arrow disappears (Fig. 3.17.). Decompression will now begin, but is very slow. You should therefore continue your ascent. DISPLAY AT THE CEILING ZONE When you reach the ceiling zone, the display will show you two arrows pointing at each other (the “hour glass”...

  • Page 30: Diving In Nitrox Mode

    Fig. 3.21. Nitrox display. Maxi- mum depth based on set O (21%) and PO (1.4 bar) is 54.1 m [177 ft]. NO DEC TIME DIVE TIME Fig. 3.22. Diving in Nitrox mode. The O % is set to 32%. 3.4. DIVING IN NITROX MODE 3.4.1.

  • Page 31: Oxygen Displays

    3.4.2. OXYGEN DISPLAYS If set to Nitrox mode the NITROX display, with all labeled oxygen information and the label NITROX, is shown after activation. In Dive Planning mode the nitrox display shows (Fig. 3.21.): • the oxygen percentage, labeled with O shown in the left side of the center window •...

  • Page 32: Oxygen Limit Fraction (Olf)

    NO DEC TIME ° TIME Fig. 3.25. Alternative display. Pressing TIME button displays current time, maximum depth, temperature, CBT and O if Air Time is less than 30 minutes. AIR TIME NO DEC TIME DIVE TIME Fig. 3.26. The lowest bar graph blinks to indicate that the OLF value shown relates to OTU.

  • Page 33: Diving In Gauge Mode

    3.5. DIVING IN GAUGE MODE If set to Gauge mode, the dive computer can be used for diving with technical diving mixed gases. If you are trained for technical diving and you plan to use Gauge mode on a regular basis, it may be preferable to set the instrument permanently to its Gauge mode (see section 4.3.

  • Page 34: At The Surface

    DIVE TIME Fig. 3.28. Surface display. You have surfaced from a 18 minute dive, which maximum depth was 20.0 m [66 ft]. The present depth is 0.0 m [0 ft]. Airplane symbol indicates that you should not fl y and diver attention symbol indicates that you should prolong your surface interval time because of excess...

  • Page 35: Dive Numbering

    If set to Nitrox mode, the following information will also be shown: • the oxygen percentage labeled with O shown on the left side of the center window • the current oxygen toxicity exposure shown with an Oxygen Limit Fraction (OLF) bar graph along the left side of the display.

  • Page 36: Flying After Diving

    Following any dive that required a decompression stop, fl ying should be delayed for at least 24 hours, and if possible, for 48 hours. • Suunto recommends that fl ying is avoided until all the DAN and UHMS guidelines and the dive computer wait to fl y conditions are satisfi ed.

  • Page 37: Audible And Visual Alarms

    3.7. AUDIBLE AND VISUAL ALARMS The dive computer features audible and visual alarms to advise when important limits are approached or to acknowledge preset alarms. A short single beep occurs, when: • the dive computer is activated. • when the dive computer automatically returns to the TIME mode. Three double beeps occur, when: •...
  • Page 38 You are able to preset alarms before the actual dive. The user programmable alarms can be set for maximum depth, dive time and time. The alarms activate when: • The preset maximum depth is reached - continuous beep series for 24 seconds or until any button is pressed.

  • Page 39: High Altitude Dives And Personal Adjustment

    WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE MAXIMUM LIMIT IS REACHED, YOU MUST IMMEDIATELY ASCEND UNTIL THE WARNING STOPS BLINKING! Failure to take action to reduce oxygen exposure after the warning is given can rapidly increase the risk of oxygen toxicity and the risk of injury or death.

  • Page 40: Personal Adjustment

    3.8.2. PERSONAL ADJUSTMENT There are adverse personal factors for DCI which divers can predict in advance and input into the decompression model. Factors that may affect susceptibility to decompression illness vary between divers and also for the same diver from one day to another.

  • Page 41: Error Conditions

    3.9. ERROR CONDITIONS The dive computer has warning indicators that alert the user to react to certain situations that would signifi cantly increased risk thew of DCI. If you do not respond to its warnings, the dive computer will enter an Error Mode, indicating that the risk of DCI has greatly increased.

  • Page 42: Menu Based Modes

    4. MENU BASED MODES To make yourself familiar with the menu based functions, please use your Quick Reference Guide supplied with the Cobra together with the information in this chapter. The main menu based functions are grouped under 1) memory, 2) dive simulation and 3) setting modes.
  • Page 43 EXIT / QUIT! By pressing the SMART button for more than 1 second, any menu based function or submode can be quit and the dive computer will return directly to the Dive Mode. THE LIST OF THE MENU BASED MODES 1 .

  • Page 44: Memories And Data Transfer [1 Memory]

    DIVE SELECT TIME Fig. 4.7. Logbook, page I. Scroll different pages of specifi c dive. DIVE STOP ASC TIME QUIT ° DIVE TIME Fig. 4.8. Logbook, page II. Main dive related data. DIVE DIVE SURF QUIT TIME Fig. 4.9. Logbook, page III. Surface interval time, average depth and ∆...
  • Page 45 Note that chronological sequence in the logbook is determined by the date, not by the dive number. The following information will be shown on four pages: Page I, main display (Fig. 4.7.) • dive number in the dive series • dive entry time and date.
  • Page 46 Page III (Fig. 4.9.) • dive number in the dive series • average depth • surface interval time before the dive ∆P describing Cylinder pressure drop during the dive. • Page IV (Fig. 4.10.) • dive number in the dive series •...

  • Page 47: Dive History Memory [2 History]

    NOTE! The maximum depth can be reset to 0.0 m [0 ft] using the optional PC-Interface unit and Suunto Dive Manager software. 4.1.3. DATA TRANSFER AND PC- INTERFACE [3 TR-PC]...
  • Page 48 20 second interval to 10, 30 or 60 seconds • input a personal, 30 character fi eld into the Cobra (i.e. your name) • reset the Dive History’s maximum depth to zero.

  • Page 49: Simulation Mode [2 Simul]

    The Dive Simulator mode is an excellent tool for becoming familiar with the dive computer and planning your dives. Suunto recommends using the dive simulator to run through different dive scenarios. The Dive Simulator will allow you to “perform” dive profi...

  • Page 50: Dive Planning Simulator [2 Simplan]

    SELECT Fig. 4.19. Dive Planning Simula- tor mode. [2 SIMPLAN]. SURF TIME Fig. 4.20. Selected Dive Plan- ning Simulator mode. Add desired surface interval incre- ment (to present shown surface interval) by pressing TIME and PLAN buttons. This display is only shown for repetitive dives.

  • Page 51: Set Modes [3 Set]

    4.3. SET MODES [3 SET] The Set Modes (Fig. 4.22.) are divided into three submodes for setting the dive-related parameters, time- related parameters and your personal preferences. 4.3.1. DIVE PARAMETER SETTINGS [1 SET DIVE] To enter the Dive Parameter Setting Mode select MODE- 3 SET- 1 SET DIVE.

  • Page 52: Dive Time Alarm Setting [2 D Alarm]

    DIVE TIME Fig. 4.25. Setting Dive Time Alarm. Press scroll buttons to change alarm on/off and to set dive time value. Fig. 4.26. Setting Maximum Depth Alarm. Press scroll but- tons to change alarm on/off and to set maximum depth value. Fig.

  • Page 53: Setting Time [2 Set Time]

    4.3.2. SETTING TIME [2 SET TIME] To enter the Time Setting Mode select MODE- 3 SET- 2 SET TIME. The Time Setting mode has three options: 1 Time, 2 Date and 3 Daily Time Alarm. 4.3.2.1. ADJUSTING TIME [1 ADJ TIME] To enter the Time Setting Mode select MODE- 3 SET- 2 SET TIME- 1 AdJ TIME.

  • Page 54: Setting Preferences [3 Set Pref]

    TIME Fig. 4.31. Setting Backlight On Time. Press scroll buttons to change backlight on/off and to set time value. ° ° Fig. 4.32. Setting Metric/Impe- rial units. Fig. 4.33. Setting Dive Com- puter model. 4.3.3. SETTING PREFERENCES [3 SET PREF] To enter the Setting Preferences Mode select MODE- 3 SET- 3 SET PREF.

  • Page 55: Care And Maintenance

    5. CARE AND MAINTENANCE This Suunto dive computer is a sophisticated precision instrument. Though designed to withstand the rigors of scuba diving, you must treat it with proper care and caution as any other precision instrument. 5.1. IMPORTANT INFORMATION DEPTH SENSOR The built-in depth sensor is a sophisticated precision component.

  • Page 56: Care Of Your Dive Computer

    The service requires special tools and training. Therefore, it is advisable to contact an authorized Suunto dealer or distributor for biennial service. Do not attempt to do any service that you are not sure about how to •...

  • Page 57: Maintenance

    Suunto does not take any responsibility for damage caused by moisture in the dive computer, if the instructions of this manual are not carefully followed. In case of a leak, immediately take the dive computer to an authorized Suunto dealer or distributor. Only an authorized Suunto dealer or distributor should do service activities.

  • Page 58: Battery Kit

    Defects caused by improper battery installation are not covered by the warranty. All history and profi le data, as well as the altitude, personal and alarm settings, will remain in the dive computer memory after the battery change. However, the clock time and time alarm setting is lost.
  • Page 59 In case of a leak or any other damage, bring the dive computer to an authorized Suunto dealer or distributor for check and repair. 8. Check the condition of the O-ring; a defective O-ring may indicate sealing or other problems.
  • Page 60 17. Reassemble computer into the console. The instrument is now ready for use. Check after the fi rst dives for possible moisture under the transparent battery compartment lid, indicating a leak. Cobra console, end piece K5606 Cobra display shield V5850...

  • Page 61: Display Shield Replacement

    5.6. DISPLAY SHIELD REPLACEMENT Unscrew the four screws at the back of the console and remove the back cover. Remove the computer and the display shield. Install new display shield and reinstall computer and console back. 5.7. COMPASS ATTACHMENT Unscrew the four screws at the back of the console and remove the back cover. Replace the console end part with compass.

  • Page 62: Technical Description

    6. TECHNICAL DESCRIPTION 6.1. OPERATING PRINCIPLES NO-DECOMPRESSION LIMITS The no-decompression limits displayed by the dive computer for the fi rst dive to a single depth (see Table 6.1. and Table 6.2.), are slightly more conservative than those permitted by the U.S. Navy tables. TABLE 6.1.

  • Page 63: Altitude Diving

    ALTITUDE DIVING The atmospheric pressure is lower at high altitudes than at sea level. After traveling to a higher altitude, the diver will have additional nitrogen in his body, compared to the equilibrium situation at the original altitude. This “additional” nitrogen is released gradually in time and equilibrium is reached.

  • Page 64: Reduced Gradient Bubble Model, Suunto Rgbm

    It is a signifi cant advance on the classical Haldane models, which do not predict free gas (microbubbles). The advantage of Suunto RGBM is additional safety through its ability to adapt to a wide variety of situations. Suunto RGBM addresses a number of diving circumstances outside the range of just dissolved gas models by: •...

  • Page 65: Oxygen Exposure

    When this is detected in addition to adapting the decompression algorithm Suunto RGBM will in some circumstances also advise, with the Diver Attention Symbol (review page 33) that the diver extend the surface interval 6.3.

  • Page 66: Technical Specification

    6.4. TECHNICAL SPECIFICATION Dimensions and weight: • Diameter: width 73mm [2.85in], length 165mm [6.50in]. • Thickness: 35mm [1.40in]. • Weight: 210g without hose [7.4 oz]. Depth Gauge: • Temperature compensated pressure sensor. • Salt water calibrated, in fresh water the readings are about 3% smaller (calibrated complying with prEN 13319).
  • Page 67 It is recommended that the instrument be stored in a dry place at room temperature. NOTE! Do not leave the dive computer in direct sunlight! Tissue Calculation Model • Suunto RGBM algorithm (developed by SUUNTO and Bruce R. Wienke, BS, MS and PhD). • 9 tissue compartments. •...
  • Page 68 Battery • One 3 V lithium battery: CR 2450 (K5597) and O-ring 1,78 mm x 31,47 mm 70 ShA (K5664). • Battery storage time (shelf life): Up to three years. • Replacement: Every two years or more often depending on dive activity. •...

  • Page 69: Warranty

    Include your name and address, proof of purchase and/or service registration card, as required in your country. The claim will be honored and the product repaired or replaced at no charge and returned in what your Suunto dealer or distributor determines a reasonable amount of time, provided all necessary parts are in stock.

  • Page 70: Glossary

    8. GLOSSARY Air Time Altitude dive Ascent rate ASC RATE Ascent time ASC TIME Ceiling Ceiling Zone Central Nervous System Toxicity CNS% Compartment Decompression Decompression range On a decompression stop dive the depth range, between the fl oor Decompression illness The amount of dive time remaining, based on a calculation of cylinder pressure and ambient pressure and present air consumption.
  • Page 71 Dive series A group of repetitive dives between which the dive computer indicates some nitrogen loading is present. When nitrogen loading reaches zero the dive computer deactivates. Dive time Elapsed time between leaving the surface to descend, and returning to the surface at the end of a dive. ∆P Delta P, describing the Cylinder Pressure drop during the dive;...
  • Page 72 Whole-Body Toxicity Another form of oxygen toxicity, which is caused by prolonged Is used to measure the Whole-Body-Toxicity. A term used by SUUNTO for the values displayed in the Oxygen Toxicity bargraph. The value is either the CNS% or the OTU%.

  • Page 74: Disposal Of The Device

    DISPOSAL OF THE DEVICE Please dispose of the device in an appropriate way, treating it as electronic waste. Do not throw it in the garbage. If you wish, you may return the device to your nearest Suunto dealer.
  • Page 75 MENU BASED MENU BASED MENU BASED MAIN MODE SUBMODE 1 SUBMODE 2...
  • Page 76 COPYRIGHT This publication and its contents are proprietary to Suunto Oy. Suunto, Wristop Computer, Suunto Cobra, Replacing Luck and their logos are registered or unregistered trademarks of Suunto Oy. All rights reserved. While we have taken great care to ensure that information contained in this documentation is both comprehensive and accurate, no warranty of accuracy is expressed or implied.
  • Page 78 Made in Finland © Suunto Oy 02 / 2004, 09 / 2006...

Table of Contents