Suunto None manual Diving in Nitrox mode DIVEnitrox, Before diving in Nitrox mode, Oxygen displays

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6.2. Diving in NITROX mode (DIVEnitrox)

NITROX mode (DIVEnitrox) is the second dive mode available in Suunto Cobra3 and is used when using oxygen-enriched gas mixtures.

6.2.1. Before diving in NITROX mode

If set to the NITROX mode, the correct oxygen percentage of the gas in your cylinder must always be entered into the computer to ensure correct nitrogen and oxygen calculations. The dive computer adjusts its mathematical nitrogen and oxygen calculation models accordingly. The dive computer will not accept fractional percentage values of oxygen concentration. Do not round up fractional percentages. For example, 31.8% oxygen should be entered as 31%. Rounding up will cause nitrogen percentages to be understated and will affect decompression calculations. If you want to adjust the computer to provide more conservative calculations, use the personal adjustment feature to affect decompression calculations, or reduce the PO2 setting to affect oxygen exposure according to the entered O2% and PO2 values. Calculations based on nitrox use result in longer no-decompression times and shallower maximum depths than diving with air.

As a safety precaution, the oxygen calculations in the computer are made with an oxygen percentage of 1% + set O2% .

When the dive computer is set in NITROX mode, the Dive Planning mode calculates using the O2% and PO2 values that are currently in the computer.

To set the nitrox mixes, refer to Section 5.8.3. Setting the nitrox values.

Default nitrox settings

In NITROX mode, the Suunto Cobra3 allows you to set 1 or 2 nitrox mixes containing 21-99% oxygen.

In the NITROX mode, the default setting for MIX1 is standard air (21% O2). It remains in this setting until the O2% is adjusted to any other percentage of oxygen (22% - 99%). The default setting for maximum oxygen partial pressure is 1.4 bar, however you are able to set it in the range of 0.5 - 1.6 bar.

MIX2 is set to OFF by default. To set MIX2 , refer to Section 6.2.4. Gas change and multiple breathing gas mixes. Oxygen percentages and maximum oxygen partial pressures for MIX2 are stored permanently.

6.2.2. Oxygen displays

When NITROX mode is activated, the display will show the information in the figure below. In NITROX mode, the maximum operational depth is calculated based on set O2% and PO2 values.

NITROX DIVE MODE ACTIVATION.

MAXIMUM OPERATIONAL DEPTH BASED ON

SET O2% (21%) AND PO2 (1.4 BAR) IS 56.7 M.

If set to NITROX mode, the Suunto Cobra3 will additionally show on the alternative display:

•the oxygen percentage, labeled O2%

•the set oxygen partial pressure limit, labeled PO2

•the current oxygen toxicity exposure, labeled OLF

•maximum depth

•current time

•water temperature

•dive time

•tank pressure

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Contents COBRA3 Time Tank pressure Before Diving Intellectual Property Welcome to the World of Suunto Diving Instruments Before DIVING. Make sure that you fully understand the use Serious injury or deathNot for Professional USE! Suunto dive computers are That tend to increase the risk of decompression illness DCIDives That Require Decompression Stops are not Nitrox mode, as well as from AIR or Nitrox mode to Gauge Mode even during the no-fly timeBatteries. Recycle or dispose of used batteries properly Before the instrument has counted down the no-fly timeButton symbols and functions Symbol Button Press Main functionsSuunto AT a Glance Navigating in the menusDown Time mode settings Setting the alarmSetting the time Setting the dateSetting the units Setting the backlightSetting the tones AC water contactsLearning how to use your compass Displays by pressing the UP/DOWN buttonsCompass display Locking a bearingCalibration Symbol ExplanationCompass settings Declination Time-outBefore Diving Suunto RGBM/Deep Stop AlgorithmEmergency ascents Dive computer limitationsAudible and visual alarms Alarm typePreset alarm types Alarm type NitroxAlarm type Alarm reason Alarm is activatedError conditions Omitted decompressionConnecting Suunto Cobra3 to a regulator Dive mode settingsSetting the depth alarm Setting the dive-time alarmSetting the nitrox values Setting the personal/altitude adjustmentsBottom time, for example Are stored until changedSetting the sample rate Setting the Safety Stops/Deep StopsSetting the Rgbm values Setting the tank pressure alarmActivation and pre-checks Accessing Dive modeDive mode activation Battery power indication Alt. adjustment value Altitude rangeDiving at altitude How the Altitude value is setRgbm setting Desired Tables Effect Personal adjustmentsPersonal Condition Desired tables Adjustment Value Mandatory Safety Stops Safety StopsRecommended Safety Stops Deep stops Diving in AIR mode DIVEair DivingOrder to perform the necessary dive pre-checks Basic dive dataBookmark Tank pressure dataDecompression dives Ascent rate indicatorLow Air Pressure Warnings Ceiling, ceiling zone, floor and decompression range Display below the floorDisplay above the ceiling Display above the floorDisplay at the ceiling zone Diving in Nitrox mode DIVEnitrox Before diving in Nitrox modeDefault nitrox settings Oxygen displaysGas change and multiple breathing gas mixes Diving in Gauge mode DIVEgaugeOxygen limit fraction OLF Modes before the no fly time has counted down Gauge mode does not provide decompression informationThere is no ascent rate monitoring in the Gauge mode Alarms Symbol on display After DivingSurface interval Dive numberingFlying after diving Plan modeDive Planning mode PLANnodec Simulation Mode PLANsimulator ModeDive numbering shown during dive planning Dive SimulatorMemory mode Dive logbook MEMLogbookProviding that the battery has been replaced according to InstructionsDive series if the no-fly time has not ended. See .2. Dive Numbering for further informationUnit and the downloadable Suunto Dive Manager software Suunto Dive Manager SDMPage Care and Maintenance of MY Suunto Diving Computer Water Contacts and Push ButtonsWarranty FAQsBattery replacement and strap kits must be used Battery Replacement Battery kitReplacing the battery Required toolsBattery compartment lid, indicating a leak Technical Data Rgbm Suunto Rgbm adaptive decompressionDiver Attention Symbol Advice to Extend Surface Interval No-decompression limitsAltitude diving Oxygen exposurePatent notice Intellectual PropertyCopyright Trademark 12.2. CE DisclaimersUser’s responsibility Warranty Period Exclusions and LimitationsLimitation of Liability Access to Suunto warranty serviceOther important notices Page Disposal of the Device Glossary EAD EANNoaa Customer Service Contacts CopyrightTWO Year Warranty Suunto Oy 9/2008, 10/2008, 11/2008
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