en Suunto D9tx User’s Guide
1. WELCOME TO THE WORLD OF SUUNTO DIVE COMPUTERS ................. 8 2. WARNINGS, CAUTIONS, AND NOTES .............................................. 9 3. SUUNTO USER INTERFACE ........................................................ 20 3.1. Navigating in the menus ......................................................... 21 3.2. Button symbols and functions ................................................... 23 4. GETTING STARTED .................................................................. 25 4.1.
5.2. Emergency ascents .............................................................. 5.3. Dive computer limitations ........................................................ 5.4. Freediving ......................................................................... 5.5. Audible and visual alarms ....................................................... 5.6. Error conditions ................................................................... 5.7. Wireless transmission ............................................
5.9.2. DIVE mode activation ....................................................... 5.9.3. Battery power indication .................................................... 5.9.4. Diving at altitude ............................................................. 5.9.5. Personal adjustments ....................................................... 5.10. Safety Stops ..................................................................... 5.10.1. Recommended Safety Stops ............................................. 5.
6.4.1. Day History .................................................................. 96 6.4.2. Free dive time limit .......................................................... 97 7. AFTER DIVING ......................................................................... 98 7.1. Surface interval ................................................................... 98 7.2. Dive numbering ................................................................... 99 7.2.1. FREE Dive .......................................
10.2. Suunto RGBM .................................................................. 10.2.1. Suunto Technical RGBM decompression model ..................... 10.2.2. Diver safety and Suunto Technical RGBM model .................... 10.2.3. Altitude diving ............................................................. 10.3. Oxygen exposure .............................................................. 11. INTELLECTUAL PROPERTY ...................................................... 11.1. Trademark .............
1. WELCOME TO THE WORLD OF SUUNTO DIVE COMPUTERS Suunto D9tx wristop dive computer is designed to help you get the most out of your diving. Suunto D9tx is the world’s first wristop sized dive computer to integrate a tilt-compensated 3D digital compass, wireless tank pressure reception, and trimix functions.It simplifies your diving experience because all the information you need relating to depth, time, optional tank pressure, decompression status, and direction is now available on one easy-to-read screen.
2. WARNINGS, CAUTIONS, AND NOTES Throughout this user's guide, important safety icons are displayed.
10 WARNING NOT FOR PROFESSIONAL USE! Suunto dive computers are intended for recreational use only. The demands of commercial or professional diving may expose the diver to depths and conditions that tend to increase the risk of decompression illness (DCI). Therefore, Suunto strongly recommends that the device not be used for any commercial or professional diving activities.
WARNING THERE IS ALWAYS A RISK OF DECOMPRESSION ILLNESS (DCI) FOR ANY DIVE PROFILE EVEN IF YOU FOLLOW THE DIVE PLAN PRESCRIBED BY DIVE TABLES OR A DIVE COMPUTER. NO PROCEDURE, DIVE COMPUTER OR DIVE TABLE WILL PREVENT THE POSSIBILITY OF DCI OR OXYGEN TOXICITY! An individual’s physiological make up can vary from day to day. The dive computer cannot account for these variations. You are strongly advised to remain well within the exposure limits provided by the instrument to minimize the risk of DCI.
12 WARNING DIVES WITH REQUIRED DECOMPRESSION STOPS ARE NOT RECOMMENDED. YOU SHOULD ASCEND AND BEGIN DECOMPRESSION IMMEDIATELY WHEN THE DIVE COMPUTER SHOWS YOU THAT A DECOMPRESSION STOP IS REQUIRED! Note the blinking ASC TIME symbol and the upward pointing arrow. WARNING USE BACK-UP INSTRUMENTS! Ensure that you use backup instrumentation, including a depth gauge, submersible pressure gauge, timer or watch, and have access to decompression tables whenever diving with the dive computer.
WARNING YOU ARE ADVISED TO AVOID FLYING ANY TIME THE COMPUTER COUNTS DOWN THE NO-FLY TIME. ALWAYS ACTIVATE THE COMPUTER TO CHECK THE REMAINING NO-FLY TIME PRIOR TO FLYING! Flying or traveling to a higher altitude within the no-fly time can greatly increase the risk of DCI. Review the recommendations given by Divers Alert Network (DAN).
14 WARNING 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.
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. WARNING DO NOT EXCEED THE MAXIMUM ASCENT RATE! Rapid ascents increase the risk of injury.
16 WARNING NEVER ASCEND ABOVE THE CEILING! You must not ascend above the ceiling during your decompression. In order to avoid doing so by accident, you should stay somewhat below the ceiling. WARNING DO NOT DIVE WITH A CYLINDER OF ENRICHED AIR IF YOU HAVE NOT PERSONALLY VERIFIED ITS CONTENTS AND ENTERED THE ANALYZED VALUE INTO YOUR DIVE COMPUTER! Failure to verify cylinder contents and enter the appropriate O2% into your dive computer will result in incorrect dive planning information.
WARNING Traveling to a higher elevation can temporarily cause a change in the equilibrium of dissolved nitrogen in the body. It is recommended that you acclimatize to the new altitude by waiting at least three hours before diving. WARNING WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE MAXIMUM LIMIT IS REACHED, YOU MUST IMMEDIATELY TAKE ACTION TO REDUCE OXYGEN EXPOSURE.
18 WARNING Using the Suunto Dive Planner software is not a substitute for proper dive training. Diving with mixed gases has dangers that are not familiar to divers diving with air. To dive with trimix, triox, heliox and nitrox or all of them, divers must have specialized training for the type of diving they are doing. WARNING Always use realistic SAC rates and conservative turn pressures during dive planning.
NOTE It is not possible to change to AIR mode after a dive in MIXED mode, before the No-fly time has elapsed. When planning both air and mixed gas dives during the same dive series, you should set the instrument in MIXED mode and modify the gas mix accordingly. NOTE In GAUGE mode the no-fly time is always 48 hours.
3.
3.1. Navigating in the menus Suunto D9tx has four main operating modes - TIME mode (TIME), DIVE mode (DIVE), PLAN mode (PLAN), and MEMORY mode (MEM). It also has a COMPASS submode, which can be activated from either TIME or DIVE modes, and a APNEA TIMER submode, which can be activated from the TIME mode. To toggle between the main modes, press the MODE button. To select a submode in DIVE and MEM modes, press the UP/DOWN buttons.
COMPASS SETTINGS Calibrate Declination Timeout TIME SETTINGS Alarm Time Dual Time Date Units Backlight Contrast Tones 22 SETTINGS Ventilation Increment Repeats DIVE LIGHT SETTINGS Gases Personal/Altitude Tank Press Pairing Tank Press Alarm Depth Alarm Depth Notify Alarm Dive Time Alarm Surface Time Notify Alarm Sample Rate Deepstop Units APNEA TIMER PLAN LIGHT SUB-MODES Air Mixed Gauge Free Off MEM LIGHT LIGHT SUB-MODES Logbook History
3.2. Button symbols and functions The table below explains the main functions of the dive computer's buttons. The buttons and their use is explained in more detail in the relevant sections of the user's guide. Table 3.1.
Symbol 24 Button Press Main functions UP Short Toggle between alternative displays Change submode Increase values UP Long Activate gas switching in MIXED mode Activate Apnea Timer in TIME mode DOWN Short Toggle between alternative displays Change submode Decrease values DOWN Long Enter Setting mode Toggle between ceiling and remaining air time display
4. GETTING STARTED To get the most out of your Suunto D9tx, use some time to personalize it and really make it YOUR computer. Set the correct time and date, as well as the alarms and tones, unit and backlight settings. Then, calibrate and test the compass function. Suunto D9tx is a very user-friendly dive computer, and you will quickly become familiar with its functions. Make absolutely sure that you know your computer and have it set up as you want it BEFORE getting into the water. 4.1.
NOTE The seconds display reverts to date display after 5 minutes in order to save battery power. NOTE The display is illuminated by holding down the MODE button for more than 2 seconds. Now that after you know how to toggle between the shortcuts, you can start to set them. The figure below shows how to enter the TIME Settings menu. USE UP AND DOWN BUTTONS TO TOGGLE BETWEEN ALARM, TIME, DUAL TIME, DATE, UNITS, CONTRAST AND TONES.
4.1.1. Setting the alarm The dive computer has a daily alarm function. The alarm can be set to be activated only once, on weekdays or every day. When the daily alarm activates, the screen blinks and the alarm sounds for 60 seconds. Press any button to stop the alarm. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 4.1.2. Setting the time In the Time setting mode, you are able to set the hour, minute, and second, as well as choose between a 12 and 24 hour display.
4.1.3. Setting the dual time In the Dual Time setting mode, you are able to select the hour and minute of a dual time, which is useful when traveling to a different time zone. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 4.1.4. Setting the date In the Date setting mode, you are able to set the year, month, and day. The day of the week is automatically calculated in accordance with the date. In metric units the date is presented as DD/MM, and in imperial units as MM/DD.
ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 4.1.6. Setting the backlight In the Backlight setting mode, you are able to turn the backlight ON or OFF and to define how long it stays on for (5, 10, 20, 30, or 60 seconds). NOTE When the backlight is turned OFF, it does not illuminate when an alarm sounds. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 4.1.7.
ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 4.1.8. Setting the tones In the Tones setting mode, you are able to activate or deactivate the tones. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. NOTE When the tones are off, there are no audible alarms. 4.2. Stopwatch The Stopwatch function in Suunto D9tx measures elapsed and split times. A separate stopwatch (dive timer) can also be used in the DIVE mode. For more information, refer to Section 6.1.6. Stopwatch (Timer).
USE DOWN BUTTON TO START STOPWATCH AND TAKE A SPLIT TIME. THE UP BUTTON STOPS THE STOPWATCH. IF YOU HAVE TAKEN SPLIT TIMES, YOU CAN SCROLL THEM BY SHORT PRESSING THE UP BUTTON. LONG PRESSING UP RESETS THE STOPWATCH. 4.3. AC water contacts The water and data transfer contact is located on the side of the case. When submerged, the water contact poles are connected by the conductivity of the water and the “AC” symbol appears on the display. The AC text is shown until the water contact deactivates.
Contamination or dirt on the water contact may prevent this automatic activation. Therefore, it is important that the water contact is kept clean. The contact can be cleaned with fresh water and a soft brush, for example a tooth brush. NOTE Water or moisture build-up around the water contact may cause the contact to activate automatically. This can happen, for example, when washing your hands or sweating.
IF ACCESSED FROM TIME MODE, TIME AND BEARING ARE DISPLAYED AT THE BOTTOM OF THE SCREEN. ACCESSED FROM DIVE MODE, CURRENT DEPTH, AND TIME OR MAXIMUM DEPTH, TANK PRESSURE, AS WELL AS BEARING OR DIVE TIME OR TEMPERATURE ARE DISPLAYED. NOTE When accessed from DIVE mode, toggle between the alternative displays by pressing the UP/DOWN buttons. 4.4.1. Compass display The Suunto D9tx displays the compass as a graphical representation of a compass rose.
4.4.2. Locking a bearing A bearing can be locked to help you follow a selected course, and directional arrows point towards the locked bearing. The last locked bearing is stored and is available the next time the compass is activated. In the DIVE mode the locked bearings are also stored in the log. TO LOCK A BEARING, PRESS SELECT. The Suunto D9tx also provides help for navigating square and triangular patterns, as well as navigating a return heading.
Symbol Explanation You are 180 degrees from the locked bearing You are 120 (or 240) degrees from the locked bearing 4.4.3. Compass settings You can define the compass settings (Calibration, Declination and Timeout) in the COMPASS mode: Calibration Because of changes in the surrounding magnetic field, the Suunto D9tx electronic compass occasionally needs to be re-calibrated. During the calibration process, the compass adjusts itself to the surrounding magnetic field .
NOTE The unit will automatically enter the calibration sequence when taken into use for the first time. Strong electromagnetic fields, such as power lines, stereo speakers, and magnets can affect the compass calibration. Therefore, it is advisable to calibrate the compass if your Suunto D9tx has been exposed to these fields. 36 NOTE When traveling overseas, it is recommended that you recalibrate the compass at the new location before using it.
To calibrate the compass: HOLD THE DEVICE LEVEL AND SLOWLY ROTATE 360°. THEN SLOWLY TURN THE DEVICE 90° TO VERTICAL POSITION. If the calibration fails several times in a row, it is possible that you are in an area with sources of magnetism, such as large metal objects, power lines or electric appliances. Move to another location and try to calibrate the compass again. If the calibration continues to fail, contact an authorized Suunto service center.
ADJUST WITH UP AND DOWN. ACCEPT WITH SELECT. Time-out You can set the compass time-out minutes. After the set time has passed from the latest button press, the dive computer returns to the TIME or DIVE mode from the COMPASS mode. ADJUST WITH UP AND DOWN. ACCEPT WITH SELECT. You can exit the COMPASS mode also by long pressing the SELECT button. 4.5. Apnea Timer You can use the Apnea Timer function for interval training in freediving. To set the Apnea Timer, follow these steps: 1.
2. In the Apnea Timer, long press DOWN to enter settings in which you can define the duration of the ventilation period and the incremental increase/decrease in time for each cycle (repetition). You can adjust values with the UP and DOWN buttons. 3. Short press SELECT, and define the number of cycles. 4. Start the first cycle by short pressing DOWN. The timer counts down the ventilation time, which is also indicated by two short beep tones. 5. Short press DOWN to start the Apnea cycle.
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5. BEFORE DIVING Do not attempt to use the dive computer without reading this user's guide 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.
The Suunto D9tx uses traditional recommended safety stops as well as deep stops. In order to optimize the response to different increased risk situations, an additional category of stop, referred to as a Mandatory Safety Stop, has been introduced. The combination of stop types depends on the user settings and the specific dive situation. To get the most from the Suunto Technical RGBM safety benefits, refer to Section 5.8.10. Setting the deep stops and Section 5.11. Deep stops. 5.2.
5.4. Freediving Freediving, and particularly freediving in combination with scuba diving, may present risks that have not been researched and are not commonly known. Anyone who engages in any form of breath hold diving is in danger of shallow-water blackout (SWB), that is, the sudden loss of consciousness caused by oxygen starvation. Any breath hold diving results in some nitrogen build-up in the blood and other fast tissues. Due to the short time spent at depth, this build-up is generally not significant.
Table 5.1. Dive computer alarms Alarm type Sound pattern Duration High priority 2.4 s sound + 2.4 s break Low priority 0.8 s sound + 3.2 s break Table 5.2. Instructional beep Sound pattern Interpretation Ascending Start ascending Descending Start descending Descendingascending Change gas The visual information on the dive computer display is shown during the alarm breaks in order to save battery.
Table 5.3. Audible and visual alarm types Alarm type Alarm reason High priority alarm followed by "Start ascending" beep, repeated for the maximum of three minutes. The PO2 value blinks. PO2 value is greater than the adjusted value. Current depth is too deep for the gas in use. You should immediately ascend or change to a gas with a lower oxygen percentage. High priority alarm followed by "Change gas" beep, sounded two times. The PO2 value blinks. PO2 value is smaller than 0.18 bar.
Alarm type Alarm reason Low priority alarm followed by No-decompression dive turns into a decompression "Start ascending" beep, stop dive. Depth is below the decompression floor sounded two times. The ASC level. You should ascend to, or above, the floor. TIME symbol blinks and an arrow points upwards. Low priority alarm followed by "Change gas" beep, sounded once. The Gas mix value (O2%, O2%|He%) blinks. Gas change is recommended. In DIVE Mixed mode only.
Alarm type Alarm reason Low priority alarm, sounded two times. The Tank pressure symbol blinks. Cylinder pressure reaches the selected alarm pressure, 10 - 200 bar. Cylinder pressure reaches the fixed alarm pressure, 50 bar. This alarm operates only if the pairing to the wireless tank pressure transmitter is performed correctly and the transmission of tank pressure data is not disrupted during the dive for any reason. You can acknowledge the alarm.
Alarm type Alarm reason Low priority alarm, sounded Indicates the length of the surface time before a new once. The Surface time value dive. In the DIVE Free mode only. You can acknowblinks. ledge the alarm. NOTE When the backlight is turned OFF, it does not illuminate when an alarm is activated. NOTE When the tones are turned OFF, the alarms are not sounded when an alarm is activated.
Omitted decompression The Error mode results from omitted decompression, for example, when you stay above the ceiling for more than three minutes. During this three-minute period the Er warning is shown and the audible alarm beeps. After this, the dive computer enters a permanent Error mode. The instrument will continue to function normally if you descend below the ceiling within this three-minute period.
1. 2. 3. Remove the high pressure (HP) port plug on the first stage of your regulator using an appropriate tool. Thread the high pressure transmitter of the Suunto D9tx into the HP port of your regulator with your fingers. DO NOT OVERTIGHTEN! Maximum torque is 6 Nm/4.4 lbsft or 53 lbsin. The seal is based on a static O-ring, not force! Attach the regulator to the scuba cylinder and slowly open the valve. Check for leaks by submerging the regulator first stage in water.
NOTE The pairing procedure only needs to be performed once, before the first use. You do not need to redo the pairing unless you change the transmitter to a new one, or another diver in your group uses the same code as you. To pair the transmitter and the Suunto D9tx dive computer: 1. Ensure that the transmitter is properly attached to the regulator’s HP port and that the regulator is properly attached to the cylinder. 2.
To assign a new transmitter code: 1. Slowly open the cylinder valve fully to pressurize the system. 2. Immediately close the tank valve, and quickly depressurize the regulator so that the pressure is reduced to less than 10 bar/145 psi. Wait about 10 seconds, and slowly open the cylinder valve again to re-pressurize to above 15 bar/300 psi. The transmitter assigns a new code automatically. NOTE To pair on the new transmitter code, the Suunto D9tx code must be cleared first.
3. 4. Short-press the MODE button to exit the DIVE settings. Take the Suunto D9tx unit close to the transmitter (the system must be pressurized to above 15bar/300 psi). The dive computer displays the received new code number and then start displaying the transmitted cylinder pressure. The wireless transmitter indicator (flash symbol) is displayed every time the Suunto D9tx receives a valid signal.
Table 5.4. Pressure transmission related displays Display Indication Figure Cd:-- No code stored, the Suunto unit is ready for pairing with the transmitter. A Cd:10 Set Code. Code number can be between 01–40. B --- The flash symbol is blinking. Pressure reading exceeds allowed limit (over 360 bar/5220 psi). C no conn Text "no conn" is displayed when the unit receives no data packets from the transmitter. Pressure reading has not been updated for more than one minute.
A B C D E 5.8. DIVE mode settings Suunto D9tx has several user-definable functions, as well as depth and time-related alarms that you can set according to your personal preferences. The DIVE mode settings are dependent on the dive submode chosen (AIR, MIXED, GAUGE, FREE), so that, for example, trimix settings are only available in the MIXED submode. The table below shows what DIVE settings are available in each DIVE submode. Table 5.5.
Setting AIR mode MIXED mode GAUGE mode FREE mode Depth notify alarm Dive time alarm X X X X X Sample rate X X X X Deep stop X Air time X X Units X X X X Surf time notify alarm X The figure below shows how to enter the DIVE mode settings menu. USE UP AND DOWN BUTTONS TO TOGGLE BETWEEN DIVE SETTINGS.
NOTE Some settings cannot be changed until five (5) minutes has elapsed after the dive. 5.8.1. Setting the gases If set to the MIXED mode, the correct oxygen and helium percentages of the gas in your cylinders (and additional gases) must always be entered into the dive computer to ensure correct tissue and oxygen calculation. In addition, the oxygen partial pressure limit must be set.
In order to minimize the risk of error during a dive, it is highly recommended that the mixes are set in the proper order. This means that as the mix number rises, so does oxygen content, and this is the order they are usually used during the dive. Before a dive, only enable the mixes you actually have available and remember to check the set values to ensure they are correct.
5.8.2. Setting the personal/altitude adjustments The current Altitude and Personal Adjustment settings are displayed in the startup screen when entering the DIVE mode. If the mode does not match the altitude or personal conditions (refer to Section 5.9.4. Diving at altitude and Section 5.9.5. Personal adjustments), it is imperative that you enter the correct selection before diving. Use Altitude Adjustment to select the correct altitude and use Personal Adjustment to add an extra level of conservatism.
ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.8.4. Setting the tank pressure alarm The tank pressure alarm can be set "ON" or "OFF" and in the range of 10–200 bar. The alarm is the secondary cylinder pressure alarm point. The alarm is activated when the tank pressure drops below the set limit. You can acknowledge this alarm. The 50 bar/700 psi alarm, however, is fixed and cannot be changed. You can acknowledge this alarm. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.8.5.
ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.8.6. Setting the depth notify alarm (FREE mode) You can set five independent Depth Notify Alarms to indicate a certain depth, for example, start of free falling or mouth filling in freediving. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.8.7. Setting the dive-time alarm The Dive Time Alarm setting can be activated and used for several purposes to add to your diving safety.
ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. NOTE With a range of 1–999 minutes, the alarm can be set to your planned bottom time, for example. 5.8.8. Setting the surface time notify alarm (FREE mode) You can set the Surface Time Notify Alarm to indicate the length of the surface time before a new dive. Suunto starts counting the time automatically when you surface (at 0.5 m/1.6 ft). ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.8.9.
You can set the dive profile sample rate in free dive to 1, 2, or 5 seconds. The sample rate for gauge, mixed and air dives is to 10, 20, 30, or 60 seconds. The factory default setting is 20 seconds. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.8.10. Setting the deep stops In the AIR mode in the Deep Stops setting mode, the Deep stops can be set “ON” or “OFF” depending on whether the Deep stops are used or not. In the MIXED mode the Deep stops are always set ON.
ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.8.12. Setting the units In the Unit settings you are able to choose between metric (meters/Celsius/bar) and imperial (feet/Fahrenheit/psi) units. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.9. Activation and pre-checks This section describes how to activate the DIVE mode and explains the pre-checks that it is highly recommended you perform before you get into the water.
5.9.1. Accessing DIVE mode The Suunto D9tx has four diving modes: AIR mode for diving with standard air only, MIXED mode for diving with oxygen and/or helium mixtures, FREE mode for freediving, and GAUGE mode for use as a bottom timer. The chosen dive mode is displayed when the DIVE mode is accessed, and you can toggle between the submodes by pressing the UP/DOWN buttons. 5.9.2. DIVE mode activation Unless the DIVE mode is set OFF, the dive computer activates automatically when submerged deeper than 0.
After activation, all graphical display elements are turned ON, and the backlight and the beep are activated. After this, the selected altitude and personal settings are displayed O2% and the PO2 values. A few seconds later the battery power indicator is shown, as well as the maximum operating depth (MOD, 66.2 m), O2% (21%) and PO2 (1.6) value. During a dive series (between two consecutive dives) the dive computer also displayes the current tissue saturation graph.
A TISSUE SATURATION GRAPH IS DISPLAYED BETWEEN DIVES WHEN DIVE MODE IS ACTIVATED. ON X-AXIS THE FAST TISSUES ARE ON LEFT AND SLOW TISSUES ON RIGHT. ON Y-AXIS, CALCULATED PERCENTUAL TISSUE SATURATION VALUES BASED ON TECHNICAL RGBM ARE SHOWN. Y-AXIS RANGES FROM 0% TO 100%. AS SURFACE TIME ELAPSES, TISSUE SATURATION PERCENTAGES DECREASE ACCORDINGLY.
the pressure transmitter is working (flash symbol blinks, cylinder pressure is displayed), and that there is no low battery warning displayed • you have enough air for your planned dive.
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. The optional wireless pressure transmitter sends out a low battery (batt) warning when its battery voltage is getting low. This is shown intermittently instead of the pressure reading.
Alt. adjustment Altitude range value A1 300–1500 m / 1000–5000 ft A2 1500–3000 m / 5000–10 000 ft NOTE Section 5.8.2. Setting the personal/altitude adjustments describes how the Altitude value is set. WARNING Traveling to a higher elevation can temporarily cause a change in the equilibrium of dissolved nitrogen in the body. It is recommended that you acclimatize to the new altitude by waiting at least three (3) hours before diving. 5.9.5.
• dehydration • personal settings in air/ean • previous history of DCI • stress • obesity • patent foramen ovale (PFO) • exercise on or after dive This feature is used to adjust the computer to be more conservative, according to personal preference, by entering the suitable Personal Adjustment setting with the help of Table 5.7, Personal Adjustment settings. In ideal conditions, retain the default setting, P0.
Table 5.7.
5.10. Safety Stops Safety Stops are widely considered good diving practice for recreational diving, and are an integral part of most dive tables. The reasons for performing a Safety Stop include: reducing sub-clinical DCI, microbubble reduction, ascent control, and orientation before surfacing. The Suunto D9tx displays two different types of Safety Stops: Recommended Safety Stop and Mandatory Safety Stop. 5.10.1.
5.10.2. Mandatory Safety Stops When the ascent rate exceeds 10 m/33 ft per minute continuously for more than five (5) seconds, the microbubble build-up is predicted to be more than is allowed for in the decompression model. The Suunto RGBM calculation model responds to this by adding a Mandatory Safety Stop to the dive. The time of this Mandatory Safety Stop depends on the severity of the ascent rate excess.
WHEN CEILING AND STOP ARE DISPLAYED WITH DOWNWARD POINTING ARROW, IMMEDIATELY (WITHIN 3 MINUTES) DESCEND TO OR BELOW CEILING. 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. In this situation, it is recommended that you prolong your surface interval time before your next dive. 5.11.
If a deep stop is violated, it does not cause the dive computer to go into an error (Er) mode. However, a penalty time is added to the subsequent decompression. In the MIXED mode, the Deep stops are always activated. NOTE 76 With Deep Stops ON, the Recommended Safety Stops will still be activated at the end of the dive.
6. DIVING This section contains instructions on how to operate the dive computer and interpret its displays. The dive computer is easy to use and read. Each display shows only the data relevant to that specific diving mode. 6.1. Diving in the AIR mode (DIVE Air) This section contains information on diving with standard air. To activate the DIVE Air mode, please refer to Section 5.9.1. Accessing DIVE mode. DIVE HAS JUST BEGUN AND AVAILABLE NO-DECOMPRESSION TIME IS OVER 99 MINUTES SO NO VALUE IS DISPLAYED.
6.1.1. Basic dive data During a No-decompression dive, the following information is displayed: • your present depth in meters/feet • the available no-decompression time in minutes as NO DEC TIME • the ascent rate presented as a bar graph on the right side • the Diver Attention Symbol if surface interval should be prolonged (see Table 7.1, Alarms) DIVE DISPLAY - PRESENT DEPTH IS 15 M, NO-DECOMPRESSION STOP TIME LIMIT 46 MIN. MAXIMUM DEPTH DURING THIS DIVE WAS 21.5 M, ELAPSED DIVE TIME 22 MIN.
DOWN BUTTON TOGGLES BETWEEN MAXIMUM DEPTH, CURRENT TIME AND TANK PRESSURE. UP BUTTON TOGGLES BETWEEN DIVE TIME AND WATER TEMPERATURE. In addition, with the optional wireless transmission enabled: • the Remaining Air time in the left center window indicated as AIR TIME (Air Time must be set ON) • the cylinder pressure in bar (or psi) displayed in the lower left corner • the cylinder pressure graphically displayed on the left side 6.1.2.
To make a bookmark in the profile memory during a dive, press the SELECT button. A brief confirmation will be given. A BOOKMARK IS PLACED IN THE PROFILE MEMORY DURING A DIVE BY PRESSING THE SELECT BUTTON. 6.1.3. Tank pressure data When using the optional wireless pressure transmitter, the pressure of your scuba cylinder in bars (or psi) is shown digitally in the lower left corner of the alternative display. Whenever you start a dive, the remaining air time calculation begins.
The change in your air consumption is based on constant one second interval pressure measurements over 30–60 second periods. An increase in air consumption influences the remaining air time rapidly, while a drop in air consumption increases the air time slowly. In this way, an over optimistic air time estimation, caused by a temporary drop in air consumption, is avoided. The remaining air time calculation includes a 35 bar/500 psi safety reserve.
Low Air Pressure Warnings The dive computer will warn you with two (2) audible double beeps and a blinking pressure display when the cylinder pressure reaches 50 bar/700 psi. Two (2) double beeps are also heard when the cylinder pressure goes down to the user-selected alarm pressure, and when the remaining air time reaches zero. 6.1.4. Ascent rate indicator The ascent rate is displayed graphically along the right hand side with a vertical bar.
WARNING DO NOT EXCEED THE MAXIMUM ASCENT RATE! Rapid ascents increase the risk of injury. You should always make the Mandatory and Recommended Safety Stops after you have exceeded the maximum recommended ascent rate. If this Mandatory Safety Stop is not completed, the decompression model will penalize your next dive(s). 6.1.5. Safety Stops and Deep Stops If Deep Stops are not used, a three (3) minute Recommended Safety Stop is prompted after every dive to over 10 m.
6.1.7. Decompression dives When your NO DEC TIME becomes zero, your dive changes into a decompression dive. Therefore, you must perform one or more decompression stops on your way to the surface. The NO DEC TIME on your display will be replaced by an ASC TIME, and a CEILING notation will appear. An upward pointing arrow will also prompt you to start your ascent. If you exceed the no-decompression limits on a dive, the dive computer will provide the decompression information required for ascent.
• • the time needed at the Mandatory Safety Stop (if any) the time needed to reach the surface after the ceiling and Safety Stops have been completed WARNING YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN DISPLAYED BY THE INSTRUMENT! The ascent time will increase if you: • remain at depth • ascend slower than 10 m/33 ft per minute or • make your decompression stop deeper than at the ceiling These factors will also increase the amount of air required to reach the surface.
The depth of the ceiling and floor depends on your dive profile. The ceiling depth will be fairly shallow when you enter the decompression mode, but if you remain at depth, it will move downward and the ascent time will increase. Likewise, the floor and ceiling may change upwards while you are decompressing. When conditions are rough, it may be difficult to maintain a constant depth near the surface.
Display below the floor The blinking ASC TIME sign and an upward pointing arrow indicate that you are below the floor. You should start your ascent immediately. The ceiling depth is shown on the left side, and the minimum total ascent time on the right side of the center window. Below is an example of a decompression dive without Deep Stops, below the floor. UPWARD POINTING ARROW, BLINKING ASC TIME AND AN ALARM TELL YOU TO ASCEND. MINIMUM TOTAL ASCENT TIME INCLUDING SAFETY STOP IS 9 MINUTES.
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” icon). Below is an example of a decompression dive at the ceiling zone. TWO ARROWS POINT AT EACH OTHER “HOUR GLASS”. YOU ARE IN THE OPTIMUM CEILING ZONE AT 3 M AND YOUR MINIMUM ASCENT TIME IS 9 MINUTES. During the decompression stop, ASC TIME will count down towards zero. When the ceiling moves upwards, you can ascend to the new ceiling.
DECOMPRESSION DIVE, ABOVE CEILING. NOTE DOWNWARD POINTING ARROW, ER WARNING AND ALARM. YOU SHOULD IMMEDIATELY (WITHIN 3 MINUTES) DESCEND TO OR BELOW CEILING. In addition, an Error warning (Er) reminds you that you have only three (3) minutes to correct the situation. You must immediately descend to, or below, the ceiling. If you continue to violate the decompression, the dive computer will go into a permanent Error Mode. In this mode, the instrument can only be used as a depth gauge and timer.
will cause inert gas 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.
6.2.2. Oxygen and helium displays When the MIXED mode is activated, the display will show the information in the figure below. In the MIXED mode, the maximum operational depth is calculated based on set O2%, He% and PO2 values.
UP BUTTON TOGGLES BETWEEN PO2, OLF, DIVE TIME AND WATER TEMPERATURE. 6.2.3. Oxygen limit fraction (OLF%) If set to the MIXED 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 separate 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).
6.2.4. Gas change and multiple breathing gas mixes The Suunto D9tx 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: NOTE Mix number, O2%, He% and PO2 for the mixes are shown when scrolling.
NOTE If no button is pressed in 15 seconds, the dive computer will go back to the dive display without changing the gas mix. Upon ascent, the computer prompts you to change gas when the PO2 level you have set for the next mix allows a gas change. The prompt is a low priority alarm followed by the "Change gas" beep, sounded once. The Gas mix (O2%:He) value blinks. 6.3.
NOTE There is no ascent rate monitoring in the GAUGE mode. NOTE If you dive with the GAUGE mode, it is not possible to change between the modes before the no fly time has counted down. In GAUGE mode, the no-fly time is always 48 hours. 6.4. Diving in the FREE mode (DIVE Free) If set to the FREE mode, the dive computer can be used as a free diving instrument. In the FREE mode, the total dive time is always displayed in minutes and seconds (mm:ss) in the center window.
NOTE The FREE mode does not provide decompression information. NOTE There is no ascent rate monitoring in the FREE mode. 6.4.1. Day History The Day History function shows the free dive history of your latest diving day. In the SURFACE mode you can enter the Day History by pressing the SELECT button.
6.4.2. Free dive time limit The FREE mode has a time limit of 10 minutes. After 10 minutes, Suunto D9tx will automatically change from Free Dive to Scuba Bottom Timer (GAUGE). After the dive, the no-fly time will countdown from 48 hours. Also, you will not be able to dive in AIR or MIXED modes until the no-fly time has counted down to zero. You can only set the DIVE mode to GAUGE or OFF. NOTE If you want to dive in AIR or MIXED mode after diving in FREE mode, remember to switch to the correct mode.
7. AFTER DIVING Once back at the surface, Suunto D9tx continues to provide post-dive safety information and alarms. Calculations to enable repetitive dive planning also help to maximize diver safety. Table 7.1. Alarms Symbol on display Indication Diver Attention Symbol - Extend Surface Interval Violated Decompression Ceiling or Too Long Bottom Time Do Not Fly Symbol 7.1. Surface interval An ascent to any depth shallower than 1.
Or, in the alternative displays, the following information will be shown: • maximum depth of last dive in meters/feet • dive time of last dive in minutes, shown as DIVE TIME • the current time, shown as TIME • the current temperature in °C/°F • cylinder pressure in bar/psi (if enabled) If set to MIXED mode, the following information will also be shown: • the oxygen percentage labeled O2% • the helium percentage labeled He% • the oxygen partial pressure labeled PO2 • the current oxygen toxicity exposure labe
7.2.1. FREE Dive Each dive series includes dives that have been performed during one day. The day's dive numbering and latest dive information resets to 0 at midnight, and each day there is a new series of dives that is recorded in the log book. The dive is completed once you ascend beyond 0.5 m. A new dive will be registered in the log book immediately you descend once again. 7.3.
• • • A minimum surface interval of 12 hours would be required in order to be reasonably assured a diver will remain symptom free upon ascent to altitude in a commercial jetliner (altitude up to 2,400 m/8,000 ft). Divers who plan to make daily, multiple dives for several days, or make dives that require decompression stops, should take special precautions and wait for an extended interval beyond 12 hours before a flight.
By pressing the UP/DOWN buttons, you can scroll the no-decompression limits in 3 m/10 ft increments ending at 45 m/150 ft. No-decompression limits longer than 99 minutes are displayed as “—“. During a dive series (between two consecutive dives) it is also possible to enter the surface interval time as a planning parameter. If the O2% is too high for the planned depth, NA is displayed instead of a numerical no-decompression limit.
• any calculated residual nitrogen • all dive history for the past four days The no-decompression times given for different depths will therefore be shorter than before your first “fresh” dive. You can exit the DIVE PLANNING mode by pressing the MODE button. NOTE The DIVE PLANNING mode is disabled in GAUGE mode and in Error mode (see Section 5.6. Error conditions). The DIVE PLANNING mode calculates no-decompression times for Mix1 only.
7.6. MEMORY mode The memory options in the MEMORY mode include dive logbook (MEM Logbook) and dive history (MEM History). They are accessed from the DIVE mode and you can toggle between them by using the UP/DOWN buttons. The dive entry time and date is registered in the Logbook memory. Always check before diving that the time and date are correctly set, especially after travelling between different time zones. 7.6.1.
THERE ARE THREE PAGES OF LOGBOOK DIVE INFORMATION. USE SELECT BUTTON TO SCROLL BETWEEN LOGBOOK PAGES I, II, AND III. THE DATA OF THE MOST RECENT DIVE IS SHOWN FIRST. YOU CAN SCROLL THE GRAPHICAL DIVE PROFILE ON PAGE III WITH UP BUTTON.
Page III • depth/time profile of the dive • water temperature • tank pressure (if enabled) NOTE Memory capacity depends on the selected sample rate. With factory default setting (20 s) and without transmitter data the capacity is approximately 140 hours. With transmitter data the capacity is minimum 35 hours. In Dive Free mode the maximum memory capacity is 35 hours. After that, when new dives are added, the oldest dives are deleted.
DIVE HISTORY DISPLAY. TOTAL NUMBER OF DIVES, DIVE HOURS AND MAXIMUM DEPTH. The Dive History Memory can hold a maximum of 999 dives and 999 diving hours. When these maximum values are reached, the counters will start again from zero. NOTE The maximum depth can be reset to 0.0 m/0 ft using the PC Interface cable and the downloadable Suunto DM4 software.
The Free Dive history gathers history of the entire sequence of free dives. Unlike the day history, the Free Dive History is not reset. 7.7. Suunto DM4 The Suunto DM4 is an optional software that greatly enhances the functionality of your Suunto D9tx. With the DM4 software, you can download dive data from your dive computer to your laptop. After that, you can view and organize all the data recorded with your Suunto D9tx.
• additional dive information (for example, SLOW and Mandatory Safety Stop violations, Diver Attention Symbol, Bookmark, Surfaced Mark, Decompression Stop Mark, and Ceiling Error Mark) • dive computer serial number • personal information (30 characters) By using the DM4, you are able to enter setup options such as: • input a personal, 30-character field into the Suunto instrument. • manually add comments, multimedia and other personal information to the PCbased dive data files 7.8.
3. 110 Follow the instructions on the DM4 on how to transfer your dives to your Movescount.com account.
8. CARE AND MAINTENANCE OF MY SUUNTO DIVING COMPUTER The SUUNTO dive computer is a sophisticated precision instrument. Although it is designed to withstand the rigors of scuba diving, you must treat it with the same proper care and caution as any other precision instrument. • WATER CONTACTS AND PUSH BUTTONS Contamination or dirt on the water contacts/connector or push buttons may prevent the automatic activation of the Dive Mode and cause problems during the data transfer.
• • • • • • • • 112 Should moisture appear inside the case or battery compartment, immediately have the instrument checked by your SUUNTO service center. The specific scratch guard for D9tx is designed to help the display from getting scratched. They can be purchased separately from your nearest retailer. The scratch guard is easy to attach and also to replace if needed (for more information, see the instructions on www.suunto.com).
MAINTENANCE The instrument should be soaked, thoroughly rinsed with fresh water, then dried with a soft towel after each dive. Make sure that all salt crystals and sand particles have been flushed out. Check the display for possible moisture or water. DO NOT use the dive computer if you detect any moisture or water inside. Contact an authorized Suunto service center for battery replacement or other service. CAUTION! • Do not use compressed air to blow water off the unit.
9. BATTERY REPLACEMENT 9.1. Computer battery replacement NOTE It is advisable to contact an authorized Suunto service center for battery replacement. It is imperative that the change is made in a proper manner to avoid any leakage of water into the battery compartment or computer. CAUTION Defects caused by improper battery installation are not covered by the warranty. CAUTION When the battery is changed, all nitrogen and oxygen uptake data is lost.
9.2. Wireless transmitter battery replacement NOTE It is advisable to contact an authorized Suunto service center for transmitter battery replacement. It is imperative that the change is made in a proper manner to avoid any leakage of water into the transmitter. 9.2.1. Transmitter battery kit The transmitter battery kit includes a 3.0 V CR ½ AA lithium cell battery and a lubricated O-ring. When handling the battery, do not make contact with both of the poles at the same time.
6. 7. 8. Check for any traces of leakage, or for any other damage. If there is a leak or any other damage, take the transmitter to an authorized Suunto representative or distributor for checking and repair. Check the condition of the O-ring. A defective O-ring may indicate sealing or other problems. Dispose of the old O-ring, even if it seems to be in good condition Check that the O-ring groove and the sealing surface of the cover are clean. Clean them with a soft cloth if necessary.
10. TECHNICAL DATA 10.1. Technical specifications Dimensions and weight: Dive Computer • Diameter: 49 mm/1.94 in • Thickness: 17 mm/0.68 in • Weight: 84 g/2.96 oz (without bracelet) Transmitter: • Max. diameter: 40 mm/1.57 in • Length: 80 mm/3.15 in • Weight: 118 g/4.
Other displays • Dive time: 0 to 999 min, counting starts and stops at 1.2 m /4 ft depth • Surface time: 0 to 99 h 59 min • Dive counter: 0 to 99 for repetitive dives • No-decompression time: 0 to 99 min (- - after 99) • Ascent time: 0 to 199 min (- - after 199) • Ceiling depths: 3.0 to 100 m /10 to 328 ft • Air time: 0 to 99 min (- - after 99) Temperature display: • Resolution: 1°C/1°F • Display range: -20 to +50°C/-9 to +122°F Display range: -9 to +50°C/-9 to +122°F • Accuracy: ± 2°C/± 3.
• Memory capacity: approximately 140 hours of diving with 20 second recording interval • Depth resolution: 0.3 m/1 ft Operating conditions: • Normal altitude range: 0 to 3,000 m/10,000 ft above sea level • Operating temperature: 0°C to 40°C/32°F to 104°F • Storage temperature: -20°C to +50°C/ -4°F to +122°F It is recommended that the instrument be stored in a dry place at room temperature.
Battery: • One 3 V lithium battery: CR 2450 • Battery storage time (shelf life): Up to three years • Replacement: Every two years, or more often depending on dive activity • Life expectancy at 20°C/68°F: • 0 dives/year –> 2 years • 100 dives/year –>1.5 years • 300 dives/year –>1 year Transmitter: • One 3V lithium battery: 1/2AA O-ring 2.00 mm x 2.
NOTE Low temperature or an internal oxidation of the battery may activate the battery warning even though the battery has enough capacity. In this case, the warning usually disappears when the DIVE mode is activated again. 10.2. Suunto RGBM The Suunto Reduced Gradient Bubble Model (RGBM) is a modern algorithm for predicting both dissolved and free gas in the tissues and blood of divers. It was developed in co-operation between Suunto and Bruce R. Wienke BSc, MSc, PhD.
10.2.1. Suunto Technical RGBM decompression model Suunto's decompression model development originates from the 1980s when Suunto implemented 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.
Tissue calculation aims to model the amount of nitrogen (N2) 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.
CAUTION Always use the same personal and altitude adjustment settings for the actual dive than for the planning. Increasing the personal adjustment 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. 10.2.3.
10.3. Oxygen exposure The oxygen exposure calculations are based on currently accepted exposure time limit tables and principles. In addition to this, the dive computer uses several methods to conservatively estimate the oxygen exposure. For example: • The displayed oxygen exposure calculations are raised to the next higher percentage value. • The CNS % limits up to1.
11. INTELLECTUAL PROPERTY 11.1. Trademark Suunto is a registered trademark of Suunto Oy. 11.2. Copyright © Suunto Oy 08/2012. All rights reserved. 11.3. Patent notice Patents have been issued or applied for one or several features of this product.
12. DISCLAIMERS 12.1. CE The CE mark is used to mark conformity with the European Union EMC directive 89/336/EEC. 12.2. EN 13319 EN 13319 is a European diving depth gauge standard. Suunto dive computers are designed to comply with this standard. 12.3. EN 250 / FIOH The tank pressure gauge and dive instrument parts used in measuring the tank pressure meet the requirements set in the section of the European Standard EN 250 that concern tank pressure measurements. FIOH, notified body no.
13. SUUNTO LIMITED WARRANTY Suunto warrants that during the Warranty Period Suunto or a Suunto Authorized Service Center (hereinafter Service Center) will, at its sole discretion, remedy defects in materials or workmanship free of charge either by a) repairing, or b) replacing, or c) refunding, subject to the terms and conditions of this Limited Warranty. This Limited Warranty is only valid and enforceable in the country of purchase, unless local law stipulates otherwise.
serial number has been removed, altered or made illegible in any way, as determined at the sole discretion of Suunto; 4. has been exposed to chemicals including but not limited to mosquito repellents. Suunto does not warrant that the operation of the Product will be uninterrupted or error free, or that the Product will work in combination with any hardware or software provided by a third party. Access to Suunto warranty service Register your item at www.suunto.
14. 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 representative.
GLOSSARY Air time The amount of dive time remaining, based on a calculation of cylinder pressure and ambient pressure and present air consumption. Altitude dive A dive made at an elevation greater than 300 m/1000 ft above sea level. Ascent rate The speed at which the diver ascends toward the surface. ASC RATE Abbreviation for ascent rate. Ascent time The minimum amount of time needed to reach the surface on a decompression stop dive. ASC TIME Abbreviation for ascent time.
DM4 Suunto DM4 with Movescount, a software for managing your dives Decompression Time spent at a decompression stop, or range, before surfacing, to allow absorbed nitrogen to escape naturally from tissues Decompression range On a decompression stop dive, the depth range between the floor and the ceiling within which a diver must stop for some time during ascent.
Half time After a change in ambient pressure, the amount of time required for the partial pressure of nitrogen in a theoretical compartment to go half way from its previous value to saturation at the new ambient pressure. He% Helium percentage or helium fraction in the breathing gas. HP Abbreviation for high pressure (= cylinder pressure). MOD The maximum operating depth of a breathing gas is the depth at which the partial pressure of oxygen (PO2) of the gas mix exceeds a safe limit.
Oxygen limit fraction A term used by Suunto for the values displayed in the oxygen toxicity bar graph. The value is either the CNS% or the OTU%. O2% Oxygen percentage or oxygen fraction in the breathing gas. Standard air has 21% oxygen. Oxygen partial pressure Limits the maximum depth to which the nitrox mixture can be safely used. The maximum partial pressure limit for enriched air diving is 1.4 bar. The contingency partial pressure limit is 1.6 bar.
UHMS Abbreviation for Undersea and Hyperbaric Medical Society. Whole-body toxicity Another form of oxygen toxicity, which is caused by prolonged exposure to high oxygen partial pressures. The most common symptoms are irritation in the lungs, a burning sensation in the chest, coughing and reduction of the vital capacity. Also called Pulmonary Oxygen Toxicity. See also OTU.
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