Suunto HELO2 manual Oxygen limit fraction OLF, Gas change and multiple breathing gas mixes

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MIXED GAS DIVE MODE ACTIVATION,

MAXIMUM OPERATIONAL DEPTH BASED ON SET O2% (14%), HE2% (32%), AND PO2 (1.4) IS

83.3 M.

If set to MIXED GAS mode, the Suunto HelO2 will additionally show on the alternative display:

•the oxygen percentage, labeled O2%

•the helium percentage, labeled He%

•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

DOWN BUTTON

TOGGLES

BETWEEN O2:HE,

MAXIMUM DEPTH

TANK PRESSURE

AND CURRENT

TIME.

UP BUTTON

TOGGLES

BETWEEN PO2,

OLF, DIVE TIME

AND WATER

TEMPERATURE.

6.2.3. Oxygen limit fraction (OLF)

If set to MIXED GAS mode, in addition to tracking the diver's exposure to inert gas, the instrument tracks the exposure to oxygen. These calculations are treated as entirely sep- arate functions.

The dive computer calculates separately for Central Nervous System oxygen toxicity (CNS) and Pulmonary Oxygen toxicity, the latter measured by the addition of Oxygen Toxicity Units (OTU). Both fractions are scaled so that the maximum tolerated exposure for each is expressed as 100%.

The Oxygen Limit Fraction (OLF) displays only the value of the higher of the two calcula- tions. The oxygen toxicity calculations are based on the factors listed in Section 10.3. Oxygen exposure .

6.2.4. Gas change and multiple breathing gas mixes

The Suunto HelO2 allows gas changes to enabled gas mixes during the dive.When the maximum operating depth allows for a gas change, the dive computer prompts you to change the gas. When PO2 permits better decompression gas to be used, the dive computer prompts it automatically if it is set as primary. Gas changes are made by following the procedure below:

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Contents HelO2 Page Welcome to the World of Suunto Diving Instruments Care and Maintenance of MY Suunto Diving Computer Using HelO2 with Dive Manager and Dive Planner Welcome to the World of Suunto Diving InstrumentsPhysician regarding your fitness before diving Or professional diving activitiesOr death ASC Time symbol and the upward pointing arrow Stop, and Rgbm adjustments are correctUSE BACK-UP INSTRUMENTS! Make sure that you use back-up Diving with the dive computerBatteries. 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 HELO2 AT a Glance Navigating in the menusDown Long Enter Setting mode Time mode settings Setting the timeSetting the date Setting the unitsAC water contacts Setting the backlightSetting the tones Suunto Technical Rgbm Before DivingPlanning your dives Mixed gas diving Emergency ascentsDive computer limitations Audible and visual alarms Alarm indication Alarm reasonAlarm indication Error conditionsOut of calculation limits Gas mixWireless transmission Installing the wireless transmitterPairing and code selection Omitted decompressionTransmitting data Display IndicationDive Mixed GAS Dive mode settingsSetting the gases Setting the depth alarm Setting the dive-time alarmSetting the personal/altitude adjustments Before you have ascended above this depthSetting the sample rate Setting the tank pressure alarmSetting the tank pressure Setting the HP codeActivation and pre-checks Accessing Dive modeDive mode activation Diving at altitude Battery power indicationAlt. adjustment value Altitude range Personal adjustments Personal adjust- Condition Desired tables Ment valueHow the Altitude value is set Before divingSafety Stops Recommended Safety StopsMandatory Safety Stops Other personal injury, and deathDeep stops Basic dive data DivingDiving-related information Decompression dives Ascent rate indicatorBookmark Ceiling, ceiling zone, floor and decompression range Than at the ceilingAccident, you should stay somewhat below the ceiling Display below the floorDisplay above the floor Display at the ceiling zoneDiving in Mixed GAS mode Before diving in Mixed GAS modeDefault gas mix settings Oxygen and helium displaysOxygen limit fraction OLF Gas change and multiple breathing gas mixesDiving in Gauge mode Alarms Symbol on display After DivingSurface interval Dive numberingPlan mode Dive Planning mode PLANnodecRepetitive dive planning Flying after divingPLANNoDec mode Memory modeMixed GAS mode, it does not affect the calculations Dive numbering shown during dive planningDive logbook MEMLogbook Dive history Suunto Dive Planner SDPDive Planner. It ensures that you have a valid decompression 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 Wireless transmitter battery replacementMade in a proper manner to avoid any leakage of water into TransmitterTransmitter battery kit Stalling the transmitter batteryPage Technical Data Battery RgbmAfter dive planning Diver safety and Suunto Technical Rgbm modelSuunto Technical Rgbm decompression model Altitude 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 EANNo DEC Time Customer Service Contacts CopyrightPage TWO Year Warranty Page Page Suunto Oy 4/2009