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Suunto HelO2 [49/64] Suunto technical rgbm decompression model
10.2.1. Suunto Technical RGBM decompression model
Suunto's decompression model development originates from the 1980s when Suunto im-
plemented Bühlmann's model based on M-values in Suunto SME. Since then research
and development has been ongoing with the help of external and internal experts. In the
late 1990s Suunto implemented Dr. Bruce Wienke's RGBM bubble model to work with the
M model. The first commercial products with the feature were Vyper and Stinger. With
these products the improvement of diver safety was significant.
Now Suunto has taken another leap in decompression modeling by introducing Suunto
Technical RGBM decompression model with He tissues.
Suunto Technical RGBM model is a modified version of the M-value model. Calculation
of the M-value model can be found in common dive literature. Modifications have been
made to have the model follow RGBM theory as closely as possible. The modifications
have been conducted with the help of Dr. Bruce Wienke. Functionality of Suunto Technical
RGBM has been validated and verified to the depth of 120 m/393 ft with hundreds of test
dives both in the field and in laboratory. The algorithm should not be used in deeper depths
than the verified depth.
Suunto technical algorithm models the human body by using nine tissue groups. In theory
the model is accurate if there are more tissue groups, but using more than nine tissue
groups has no practical significance.
Tissue calculation aims to model the amount of nitrogen (N
2
) and helium (He) saturated
in tissues. Ongasing and offgasing of saturated gas is modelled using the ideal gas
equation. In practice this means that the total pressure of the nitrogen and helium tissues
can be higher than the total pressure of the breathing gas, even without any exposure to
pressure. For example, when a diver dives an air dive soon after a demanding trimix dive,
the residual pressure of helium combined with a high nitrogen content cause the diver a
decompression obligation very fast.
10.2.2. Diver safety and Suunto Technical RGBM model
Because any decompression model is purely theoretical and does not monitor the actual
body of a diver, no decompression model can guarantee the absence of DCI. Suunto
Technical RGBM model has many features that reduce the risk of DCI. The Suunto
Technical RGBM algorithm adapts its predictions of both the effects of microbubble build-
up and adverse dive profiles in the current dive series. The pattern and speed of decom-
pression is adjusted according to the microbubble influence. The adjustment is also applied
to the maximum combined nitrogen and helium overpressure in each theoretical tissue
group. To add diver safety, offgasing is also slowed down compared to ongasing and the
amount of slowing down depends on the tissue group.
Experimentally it has been shown that the body adapts to decompression to some degree
when diving is constant and frequent. Two personal adjustment settings (P-1 and P-2) are
available for divers who dive constantly and are ready to accept greater personal risk.
CAUTION
Always use the same personal and altitude adjustment settings for
the actual dive than for the planning. Increasing the personal adjust-
ment setting from the planned setting as well as increasing the altitude
adjustment setting can lead to longer decompression times deeper
and thus to larger required gas volume. You can run out of breathing
gas underwater if the personal adjustment setting has been changed
after dive planning.
49
Содержание
- Suunto helo2 user s guide 1
- User s guide 1
- Table of contents 3
- Using helo2 with dive manager and dive planner 5
- Welcome to the world of suunto diving instruments 5
- Warnings cautions and notes 6
- Button symbols and functions 9
- Navigating in the menus 9
- Suunto helo2 at a glance 9
- Getting started with your suunto helo2 11
- Setting the date 11
- Setting the time 11
- Setting the units 11
- Time mode settings 11
- Ac water contacts 12
- Setting the backlight 12
- Setting the tones 12
- Before diving 13
- Planning your dives 13
- The suunto technical rgbm 13
- Dive computer limitations 14
- Emergency ascents 14
- Mixed gas diving 14
- Audible and visual alarms 15
- Error conditions 16
- Installing the wireless transmitter 17
- Pairing and code selection 17
- Wireless transmission 17
- Transmitting data 18
- Mixed gas dive mode settings 19
- Setting the gases 19
- Setting the depth alarm 20
- Setting the dive time alarm 20
- Setting the personal altitude adjustments 20
- Setting the hp code 21
- Setting the sample rate 21
- Setting the tank pressure 21
- Setting the tank pressure alarm 21
- Accessing dive mode 22
- Activation and pre checks 22
- Dive mode activation 22
- Setting the units 22
- Battery power indication 23
- Diving at altitude 23
- Personal adjustments 24
- Mandatory safety stops 25
- Recommended safety stops 25
- Safety stops 25
- Deep stops 26
- Basic dive data 27
- Diving 27
- Diving related information 27
- Ascent rate indicator 28
- Bookmark 28
- Decompression dives 28
- Safety stops 28
- Ceiling ceiling zone floor and decompression range 29
- Display above the ceiling 30
- Display above the floor 30
- Display at the ceiling zone 30
- Display below the floor 30
- Before diving in mixed gas mode 31
- Default gas mix settings 31
- Diving in mixed gas mode 31
- Oxygen and helium displays 31
- Gas change and multiple breathing gas mixes 32
- Oxygen limit fraction olf 32
- Diving in gauge mode 33
- After diving 34
- Dive numbering 34
- Surface interval 34
- Dive planning mode plannodec 35
- Flying after diving 35
- Plan mode 35
- Repetitive dive planning 35
- Dive numbering shown during dive planning 36
- Memory mode 36
- Dive logbook memlogbook 37
- Dive history 38
- Suunto dive planner sdp 38
- Suunto dive manager sdm 39
- Www suuntosports com and suunto diving world at www suunto com diving 39
- Care and maintenance of my suunto diving computer 41
- Battery kit 43
- Battery replacement 43
- Replacing the battery 43
- Required tools 43
- Battery 44
- Battery compartment lid with buzzer 44
- Battery retainer 44
- O ring 44
- Securing ring 44
- Wireless transmitter battery replacement 44
- Replacing the transmitter battery 45
- Required tools 45
- Transmitter battery kit 45
- Technical data 47
- Technical specifications 47
- Diver safety and suunto technical rgbm model 49
- Suunto technical rgbm decompression model 49
- Altitude diving 50
- Oxygen exposure 50
- Copyright 51
- Intellectual property 51
- Patent notice 51
- Trademark 51
- Disclaimers 52
- User s responsibility 52
- Suunto limited warranty for suunto diving com puters and suunto diving computer accessories 53
- Suunto limited warranty for suunto diving computers and suunto diving computer accessories 53
- Disposal of the device 56
- Glossary 57
- Copyright 59
- Customer service contacts 59
- Two year warranty 61
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