300G TM & ATMOS Pro ™ OWNER'S GUIDE R1
Atmos Pro/Aeris 300G RESPONSIBLE COMPUTER DIVING • Always Plan Each Dive • Always Limit Your Dive to the Level of Your Training and Experience • Always Make Your Deepest Dive First • Always Make The Deepest Part of Every Dive First • Check Your Computer Often During the Dive • Do A Safety Stop on Every Dive • Allow Adequate Surface Interval Between Each Dive • Allow Adequate Surface Interval Between Each Day of Diving (12 Hours or Until Your Computer Clears) Read And Understand This Owner's Guide Thoroughl
Pay special attention to items marked with this Warning symbol. WARNINGS: • The Atmos Pro and Aeris 300G are intended for use by recreational divers who have successfully completed a nationally recognized course in scuba diving, and diving with enriched nitrogen-oxygen (nitrox) mixtures. • It is intended only for no decompression diving, NOT intentional decompression diving.
Atmos Pro/Aeris 300G LIMITED TWO-YEAR WARRANTY Aeris guarantees, to the original purchaser only, that the Atmos Pro or Aeris 300G will be free of defects in materials and/or craftsmanship under normal recreational multilevel scuba use for two years from date of purchase, provided proper care and annual service are performed as described within this owner’s guide.
COPYRIGHT NOTICE This owner’s guide is copyrighted, all rights are reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine readable form without prior consent in writing from Aeris / 2002 Design. Atmos Pro/Aeris 300G Owner's Guide, Doc. No. 12-7014 © 2002 Design 1997 2002 Davis Street San Leandro, Ca.
Atmos Pro/Aeris 300G CONTENTS FEATURES AND DISPLAYS ................................................................1 Introduction ................................................................................................................. 2 Control Buttons ........................................................................................................... 4 Informational Displays ................................................................................................. 5 Bar Graphs ....
CONTENTS (continued) ACTIVATION & SETUP ......................................................................17 Activating the Display ................................................................................................ 18 Surface Mode ............................................................................................................ 19 Entering Settings ....................................................................................................... 20 Set FO2 Default ..........
Atmos Pro/Aeris 300G CONTENTS (continued) FO2 Mode ................................................................................................................. 39 Time to Fly and Desaturate ....................................................................................... 40 R1 Dive Planner .............................................................................................................. 42 Dive Log Mode ..................................................................................
CONTENTS (continued) Unexpected Loss of Displayed Information ............................................................... 65 CARE & MAINTENANCE ...................................................................67 Care and Cleaning .................................................................................................... 68 Annual Inspections & Service ................................................................................... 69 How to Obtain Service .................................
Atmos Pro/Aeris 300G FEATURES and DISPLAYS 1
INTRODUCTION Welcome to Aeris and thank you for choosing the Atmos Pro dive computer module, or Aeris 300G with pressure gauge! Your Atmos Pro or Aeris 300G presents the information that you need before, during, and after your air (or nitrox) dives using Aeris' intuitive combination of easy to read displays and unique identification icons.
Atmos Pro/Aeris 300G WARNING: Inspect your Atmos Pro/Aeris 300G prior to every dive, checking for any signs of the entrance of moisture, damage to the button membranes, or damage to the LCD display. If these or other signs of damage are found, return the unit to an Authorized Aeris Dealer. DO NOT attempt to use it until it has received factory service.
CONTROL BUTTONS The Atmos Pro/Aeris 300G is a unique dive computer with interactive controls that allow you to select various display options and access specific information when you choose to see it. The controls consist of the Advance (Left) button and Select (Right) button (Fig. 1). The control buttons can be pressed repeatedly, or held in to scroll and continue as you set or access different display modes.
Atmos Pro/Aeris 300G INFORMATIONAL DISPLAYS Operational modes and status information are visually represented numerically and/or graphically and can be understood at a glance with the aide of universal icons (Fig. 2) that identify and bring quick focus to the displays. Also, segmented bar graphs will show how close you are to critical limits. The Aeris 300G has an audible alarm that sounds to alert you to check the display data in critical situations.
BAR GRAPHS YG EN NIT R O X G EN Three bar graphs appear around the perimeter of the upper screen (Fig. 3). These segmented bar graphs are located next to green, yellow, and red color coded portions of the peripheral decal that denote normal, caution, and danger zones, respectively.
Atmos Pro/Aeris 300G decompression limit with a yellow Caution zone. This portion of the bar graph allows you to make a decision regarding safety stop duration or necessity. While you cannot provide a guarantee against the occurrence of decompression sickness, you may choose your own personal zone of caution based upon age, physique, excessive weight, etc., to reduce the statistical risk. The Nitrogen Bar Graph assists you with managing decompression by filling a large red 'ceiling stop required' segment.
X G YG EN NIT R O EN The O2 Bar Graph (Fig. 5) represents oxygen loading, your relative oxygen tolerance dosage (OTU), showing the maximum of either per dive accumulated oxygen, or 24 hour period accumulated oxygen. As your exposure (accumulation of oxygen) increases during the dive, segments will add to the bar graph, and as oxygen loading decreases, the bar graph will begin to recede, indicating that additional exposure is allowed for that dive, and 24 hour period. O Fig.
Atmos Pro/Aeris 300G The 5 triangular segments of the bar graph may be considered an ascent rate speedometer. Green is a 'normal' rate, yellow a 'caution' rate, and red is 'Too Fast'. The actual speeds represented are shown at the right. When your ascent rate exceeds the maximum recommended rate of 60 feet (18 meters) per minute, the bar graph segments will enter the red 'Too Fast' zone and all 5 segments will flash once per second until your ascent speed is slowed.
the remainder of that dive, and as the Max Depth in the Dive Log for that dive. This is described in detail in the Handling the Extremes section. During a Decompression Dive, the required Ceiling Stop Depth replaces Maximum Depth (Fig. 8a). Maximum Depth can be viewed by depressing the Advance (left) control button. This is described in detail in the Handling the Extremes section. FT YG EN NIT R O X G EN O FT a Time Displays Fig.
Atmos Pro/Aeris 300G YG EN NIT R O able, Dive Time Remaining, Decompression Stop Time, Total Ascent Time required, Time to Fly, and Time to Desaturate, are calculated projections of time and use a solid (non-blinking) colon to indicate that they are counting down, rather than up. EN YG X EN O a Fig. 11 - Temperature (Dive) a EN YG EN G Date and Time are not displayed when the unit is in a dive mode. FT NIT R O While in the Surface mode, Time of Day will appear for 5 seconds (Fig.
Pressure Display (Aeris 300G only) P... BEE EP... BE EP... BE P... BEE EP... BE EP... BE (Low Pressure) P! BEE EP! BE The analog Cylinder Pressure gauge, indicates how much breathing gas is in your cylinder, up to 5000 PSI (352 BAR) to the nearest 10 PSI (.5 BAR). Pressure will be displayed continuously. AUDIBLE ALARM (AERIS 300G ONLY) Low Pressure Alarm: • When tank pressure decreases to 500 psi (35 BAR), 6 beeps will be emitted followed by one beep every 20 seconds until you surface.
Atmos Pro/Aeris 300G Single Long Beep (Permanent Violation) • Depth was shallower than a required stop depth for more than 5 minutes. • Required Decompression exceeds a 60 FT/ 18 M ceiling. • Five minutes after a conditional violation on the surface. ! EEP EE BEE (Violation) Short Beep (Transition) To indicate that a command has been accepted. • Immediately following activation and the Diagnostic Mode.
OPERATING TEMPERATURE The Atmos Pro/Aeris 300G will operate in almost any temperature diving environment in the world (Fig. 14) between - 40 °F and 140 °F (- 10 and 60 °C). At extremely low temperatures, the LCD may become sluggish, but this will not affect it's accuracy. If stored or transported in extremely low temperature areas (below freezing), you should warm the module and its batteries with body heat before diving.
Atmos Pro/Aeris 300G b i h M FT g EN NIT R O c YG EN X G a a. b. c. d. e. f. g. O d M FT MAX e h. i. j. k. l.
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Atmos Pro/Aeris 300G ACTIVATION and SETUP 17
ACTIVATING THE DISPLAY WARNING: Never attempt to activate the Atmos Pro/Aeris 300G underwater. This may result in inaccurate depth and nodecompression time displays. If the unit is activated when deeper than 4 feet (1 meter) underwater, or at elevations higher than 14,000 feet (4,267 meters), it will perform a diagnostic check followed by immediate shutdown. To activate the unit, press the Select (Right) button once and release. It will immediately enter Diagnostic Mode, displaying all “8’s” (Fig.
Atmos Pro/Aeris 300G Always check the display before entering the water to ensure that it is activated!! X G EN YG EN NIT R O WARNING: During activation and diagnostics, if any display or function varies from the information presented here, return the Atmos Pro/Aeris 300G to your Aeris Dealer for inspection. a O SURFACE MODE a G EN YG EN NIT R O If battery voltage is low, the Battery icon will be displayed, flashing (Fig. 17a) and the unit will shut off.
ENTERING SETTINGS Before going diving, set the date/time, and select FO2 default (on/off), units of measure, and dive profile resolution. For the Aeris 300G model only, select the audible alarm (on/off). Setting the FO2 'value' for the nitrox mix being used is a 'pre dive' setting that must be entered before 'each' nitrox dive. This is described in the Pre Dive and Dive Mode section.
Atmos Pro/Aeris 300G SET FO2 (50%) DEFAULT - ON/OFF EN YG X EN YG EN X O Fig. 20 - Set Audible Alarm FT YG EN NIT R O EN X G Factory set for 'imperial' units of measure , FT and °F (Fig. 21). To change display values to 'metric' units of measure (M and °C): • depress both buttons simultaneously while in Surface Mode. • depress the Advance (Left) button 1 time (Atmos Pro), or 2 times (Aeris 300G), to access the Units Mode.
SET DATE/TIME YG EN NIT R O X G EN O Fig. 22a - Set Date M X G YG EN NIT R O EN O Fig. 22b - Set Time 22 Factory set for January 1, 1997, 12:00 AM (midnight). To change to the correct Date/Time: • depress both buttons simultaneously while in Surface Mode. • depress the Advance (Left) button 3 times (Atmos Pro), or 4 times (Aeris 300G), to access the Date/Time Mode. The DATE screen will appear with the Year 'flashing' (Fig. 22a).
Atmos Pro/Aeris 300G SET DIVE PROFILE SAMPLING RATE EN YG X EN YG X G EN Although this mode (Fig. 24) is within the sequence of settings, it does not have any set points or selections. The mode provides user access to the PC download feature that is described in the Post Dive Mode section of this guide. Also, the factory uses it to access diagnostic and calibration information. O Fig. 23 - Set Sample Rate NIT R O EXTERNAL ACCESS (EA) MODE EN G Factory set for 10 FT (3 M).
SUMMARY OF SET MODE SEQUENCE To access a specific set mode from the Surface Mode, press both buttons simultaneously and momentarily (for less than 4 seconds) then press the Advance (Left) button the number of times indicated below.
Atmos Pro/Aeris 300G PRE DIVE and DIVE MODES 25
OPERATIONAL MODES The Diagnostic, Surface, and Set Modes were explained in the previous section, Activation and Setup. This section describes other modes that the Atmos Pro/ Aeris 300G operates in before and during a dive. FO2 MODE WARNING: The percentage of oxygen (FO2) in the nitrox mix being used must be set 'before each' nitrox dive, unless the FO2 default feature has been turned 'off'. X G YG EN NIT R O EN The Atmos Pro/Aeris 300G can be used either as an Air computer or as a Nitrox computer.
Atmos Pro/Aeris 300G FT O FT MAX Fig. 26 - No Deco Dive 'Air' X G EN YG EN NIT R O If the FO2 default is 'On', the FO2 value must be reset for each repetitive nitrox dive, or the value will automatically be 50 and the dives will be calculated based on 50% O2 for oxygen calculations and 21% O2 (79% nitrogen) for nitrogen calculations.
new dive and the FO2 value must be reentered. Once a dive is made with the unit set as a nitrox computer (FO2 set for a numerical value), the unit cannot be programmed to operate as an 'Air' computer until 24 hours after the last dive. 'Air' will not be displayed as an option in the FO2 Mode. However, you can set FO2 for 21% for use with air. To set (enter) a numerical value for the percentage of oxygen (FO2) in your nitrox mix: YG EN NIT R O X G EN O FT MAX a Fig.
Atmos Pro/Aeris 300G DIVE PLANNER Aeris strongly recommends that you review the Dive Planner prior to every dive to help you plan your dive as required to avoid exceeding no decompression or oxygen exposure limits. This is especially important for repetitive dives, when the Dive Planner (Fig. 29) will indicate for you the no decompression bottom times that are available to you on your next dive, based on any residual nitrogen accumulation following your last dive and surface interval.
that can be achieved with a PO2 of 1.60 BAR will not be displayed. To access the Dive Planner while in the Surface mode: FT YG EN NIT R O X G EN O Fig. 30 - Nitrogen Control FT • if the Select (Right) button is not depressed for a period of 2 minutes, the unit will automatically revert to the Surface mode. • to revert to the Surface mode at any time while in the Dive Planner mode, press the Advance (Left) button once.
Atmos Pro/Aeris 300G calculated to be controlled by oxygen loading. EN YG EN X G WARNING: The Atmos Pro/Aeris 300G must be manually activated and be in an operating mode prior to start of a dive. The unit will not activate automatically by immersion in water. Also, the FO2 setting must be verified prior to each nitrox dive. NIT R O The Atmos Pro/Aeris 300G will store oxygen accumulation for up to 12 dives conducted during a 24 hour period.
To activate the backlight, press the Select (Right) button. The displays will be R1 illuminated for 5 seconds. Press and release again as desired FT YG EN NIT R O To view Temperature (Fig. 34a), press the Advance (Left) button. It will replace Max Depth and Elapsed Dive Time for depression time plus 3 seconds. X G EN O a Fig.
Atmos Pro/Aeris 300G VIOLATION MODES The Atmos Pro/Aeris 300G enters various Violation Modes when it is unable to predict an ascent procedure. GAUGE MODE If the Atmos Pro/Aeris 300G enters a Permanent Violation Mode, it will not display information relating to nitrogen or oxygen loading for the remainder of that dive or for subsequent dives conducted during the 24 hour period after surfacing. Depth and Elapsed Dive Time will be displayed.
Even if you do not enter the Decompression Mode, a safety stop made between 15-20 feet (5-6.5 meters) is strongly recommended as a standard procedure before completing your ascent. You should make every effort to complete all of your ascents with the Nitrogen Bar Graph inside of the green zone.
Atmos Pro/Aeris 300G diving in high altitude lakes or rivers from 2,000 to 14,000 feet (610 to 4,268 meters), the Atmos Pro/Aeris 300G will adjust automatically, providing corrected depth and reduced No Decompression and Oxygen Exposure times. Also, when above 2,000 feet (610 meters), depth calibration is automatically changed to read in feet of freshwater rather than feet of seawater. The Atmos Pro/Aeris 300G will not activate above 14,000 feet (4,268 meters).
SUMMARY OF PRE DIVE & DIVE MODES To access a specific Pre Dive mode from the Surface Mode, press the button(s) as follows: MODES Backlight Time/Date FO2 set Dive Planner Log Mode Set Mode TO ACCESS Right '1' time Left '1' time Left '2' times Left '3' times Left '4' times Both '1' time TO SET/VIEW Right (hold or repetitive) Right (hold or repetitive) Right (hold or repetitive) Refer to page 24 of this Guide During the No Decompression Dive Mode, press the button(s) as follows: MODES Backlight Temperature
Atmos Pro/Aeris 300G POST DIVE MODES 37
POST DIVE SURFACE MODE When you ascend to 3 feet (1 meter) or shallower, the Atmos Pro/Aeris 300G will enter Surface Mode (Fig. 38) and begin counting your surface interval. TRANSITION PERIOD The first 10 minutes is, in affect, a transition period during which time: • • • • • • X G YG EN NIT R O EN O Fig. 38 - Surface Mode (less than 10 min.) 38 The Surface Mode icon will appear (flashing). The 'number' of that dive appears in the upper portion of the screen.
Atmos Pro/Aeris 300G If you descend during the 10 minute transition period, time underwater will be considered a continuation of that dive. The time at the surface (if less than 10 minutes) will not be added as Elapsed Dive Time. EN YG X EN G FO2 MODE NIT R O Once 10 minutes have elapsed, the Surface Mode icon and Surface Interval time display colon will stop flashing (Fig. 39) indicating that the dive and transition period are completed, and a subsequent descent will be considered a new dive.
Remember!! You must ensure that the FO2 setting matches the specific nitrox mix being used for each nitrox dive. To verify the FO2 setting while in the Surface Mode: YG EN NIT R O X G EN O • press the Advance (Left) button 2 times. FT MAX Fig. 41 - PO2 Max Depth If FO2 was set for a numerical value, the Maximum Depth that can be achieved with an oxygen partial pressure of 1.60 ATA for the FO2 value set will be displayed with the letters 'PO2' in the lower screen (Fig. 41).
Atmos Pro/Aeris 300G The Fly countdown starts at 23:50 (hr:min) and counts down to 0:00 (hr:min). X G EN YG EN NIT R O The Desaturation counter, lower screen (Fig. 43), provides calculated time for tissue desaturation at sea level. The countdown starts at 9:59 (hours:minutes) maximum and counts down to 0:00. If the time is calculated to be greater than 9:59, the display will indicate 9:+ (Fig. 44) until it decreases to 9:59.
DIVE PLANNER During the first 2 hours after a dive, after the 10 minute Transition Period, R1 the Dive Planner can be accessed by depressing the Advance (Left) button 4 times while in the Surface Mode. The Dive Planner will show 'adjusted' No Decompression Limits (Fig. 45) based on residual nitrogen calculated to be remaining from the previous dives.
Atmos Pro/Aeris 300G leting the oldest). Dive log information will not be lost when batteries are removed from the unit. Factory service will delete the log information. EN YG EN X G O Fig. 46 - Log Mode (first screen - date/time) YG EN NIT R O EN X G To access the Dive Log during the 10 minute Transition Period: R1 • depress the Advance (Left) button 2 times to view the first screen (Fig. 46) • Log Mode icon. • Date and Time of Day that the dive started.
• Surface Interval prior to that dive (and icon). • Ascent Rate Indicator - showing the maximum ascent rate at any time during the dive. • Nitrogen Bar Graph - showing tissue nitrogen loading at the time you surfaced at the end of the dive. • depress the Select (Right) button 1 time to view the Oxygen Log (Fig.
Atmos Pro/Aeris 300G EXTERNAL ACCESS (EA) MODE R1 Using special infrared linking hardware and a unique PC software program, data can be downloaded (copied) into an IBM compatible PC program running on a Windows® 95 operating system. Instructions for performing the interface and download are provided with the Dive Downloader (DDA) hardware/software package, available separately from your Authorized Aeris Dealer.
SUMMARY OF POST DIVE MODES During the first 2 hours after a dive* (after the 10 minute Transition Period has ended): MODES TO ACCESS Backlight Right '1' time Time/Date FO2 set R1 Fly/Desaturate Dive Planner Log Mode Set Mode EA Mode (Atmos Pro) EA Mode (Aeris 300G) TO SET/VIEW Left '1' time Left '2' times Left '3' times Left '4' times Left '5' times Right (hold or repetitive) Right (hold or repetitive) Both '1' time Both '1' time, Left '2' times Both '1' time, Left '3' times Refer to page 26 of thi
Atmos Pro/Aeris 300G HANDLING THE EXTREMES 47
EMERGENCY DECOMPRESSION There are few legitimate excuses for making unplanned Decompression dives, and the consequences of this type of diving can be severe. Decompression diving requires special training and support. The Atmos Pro/Aeris 300G is intended for use by recreational divers not engaged in intentional decompression diving. Decompression features are provided only for emergency situations.
Atmos Pro/Aeris 300G The Atmos Pro/Aeris 300G is a sophisticated instrument designed with capabilities that go beyond the range of recreational diving with compressed air. It should not be considered, however, that these built-in capabilities provide any implied approval or consent from Aeris for individuals to exceed the defined limits of recreational dive profiles, as agreed on by all internationally recognized training agencies. Decompression diving should therefore be strictly avoided.
WARNING: Existing data for making planned decompression dives is extremely limited, and virtually nonexistent for repetitive decompression diving. You must therefore avoid decompression diving and allow a surface interval of at least 24 hours before reentering the water in the event a dive requiring emergency decompression is made. If you're not careful, it is possible to enter decompression rapidly, whether at deep depths or during repetitive dives.
Atmos Pro/Aeris 300G NITROGEN BAR GRAPH 'CAUTION' ZONE Your dive training taught you not to get too close to the No Decompression Limits. The yellow Caution zone of the Nitrogen Bar Graph (Fig. 52) offers you a convenient way to consistently monitor how close you are coming to the No Decompression Limit. Aeris suggests always leaving the water with the Nitrogen Bar Graph in the green No Decompression zone. FT YG EN NIT R O EN G Body metabolism varies from person to person, and even from day to day.
WARNING: Aeris recommends the application of responsible diving practices and does not recommend decompression diving, or diving deeper than 130 feet (39 m), as these practices will greatly increase your risk of decompression sickness. FT YG EN NIT R O X G EN O FT Fig.
Atmos Pro/Aeris 300G will greatly increase your risk of decompression sickness, and place the unit into a Conditional Violation Mode, described later. When coping with surge and swells, it may be difficult to stay at an exact depth. You should stay slightly deeper (Fig. 55a) than the required stop depth indicated until the next shallower stop depth appears. Then, you can ascend to, but not shallower than, that indicated ceiling stop depth.
VIOLATION MODES The Violation Modes that the Atmos Pro/Aeris 300G can enter, depending on the situation, are termed Conditional, Delayed, and Immediate. Gauge Mode and Permanent Violation Mode are continuations of these Violation Modes. It is important to understand each different Violation Mode and how to carry out emergency procedures in the event you enter one.
Atmos Pro/Aeris 300G If you descend below the required decompression ceiling 'before 5 minutes have elapsed', the unit will continue to function as if no violation had occurred. In this case, no off-gassing credit will be given, and for each minute above the ceiling 11/2 minutes of penalty time is added to decompression stop time. The added penalty decompression time will have to be 'worked off' first, before obtaining off-gassing credit.
As previously described, you would then need to follow the ceiling stop depths and times toward the surface as the Nitrogen Bar Graph recedes into the yellow Caution zone. Upon reaching 'zero' Total Ascent Time Remaining, you should continue decompressing until the bar graph segments are well inside of the green No Decompression zone. The Aeris 300G will emit one long beep then continue to beep once per second until you descend below the required ceiling stop depth. 2.
Atmos Pro/Aeris 300G After Total Ascent Time reaches zero and the Nitrogen Bar Graph recedes into the yellow Caution zone, you can surface. However, to add a greater margin of protection, Aeris strongly recommends that you wait until the segments of the Nitrogen Bar Graph are well within the 'green' No Decompression zone, unless a low tank pressure condition requires you to surface. 3. You descend deeper than 330 feet (99.5 meters).
IMMEDIATE VIOLATION MODE WARNING: The Atmos Pro/Aeris 300G enters Immediate Violation Mode when a situation totally exceeds its capacity to predict an ascent procedure. These dives represent gross excursions into decompression that are beyond the boundaries and spirit of the unit's design. If you are following these dive profiles, Aeris advises you not use an Atmos Pro or Aeris 300G dive computer.
Atmos Pro/Aeris 300G Flashing FT YG EN NIT R O EN G Underwater, the Gauge Mode is a continuation of the Immediate Violation Mode that turns the unit into a digital instrument without any decompression or oxygen monitoring functions. Dive Time Remaining will not be displayed and the Nitrogen and O2 Bar Graphs will flash as a warning of this condition (Fig. 61).
PERMANENT VIOLATION Entering the Immediate Violation Mode, then Gauge Mode, will result in loss of all decompression and oxygen monitoring functions for 24 hours after that dive. This is considered a Permanent Violation. EXCEEDING MAXIMUM OPERATING DEPTH Although the Atmos Pro/Aeris 300G will withstand the pressures found at 330 feet (99.5 meters), the depth that you can still use all of its features could be much shallower. Flashing Flashing FT YG EN NIT R O X G EN O FT MAX Fig.
Atmos Pro/Aeris 300G For the remainder of that dive, and in the log for that dive, only the letters 'oor' will be displayed as the value for Maximum Depth. OXYGEN EXPOSURE There are few legitimate excuses for exceeding the maximum limits for exposure to oxygen, and the consequences of CNS (Central Nervous System) oxygen toxicity can be severe, resulting in Gran Mal convulsions and drowning. Diving with enriched nitrogen-oxygen (nitrox) mixtures requires special training and certification.
provide any implied approval or consent from Aeris for individuals to exceed the defined limits of oxygen exposure, as agreed on by all internationally recognized nitrox training agencies. Nitrox diving should therefore be strictly controlled. PARTIAL PRESSURE OF OXYGEN (PO2) As depth increases during the dive, the partial pressure of oxygen increases.
Atmos Pro/Aeris 300G ously as a warning (Fig. 65) until the level of PO2 decreases below 1.60 ATA. The Aeris 300G emits one beep per second. In the event that you enter High PO2 Dive Mode, you must immediately focus on reducing the partial pressure of oxygen by slowly ascending to a shallower depth at a safe rate in accordance with your nitrox training. If you continue the dive at your current depth, or descend deeper, your exposure to CNS oxygen toxicity will increase.
YG EN NIT R O WARNING: In the event that you exceed the maximum per dive allowable oxygen exposure (dose), it is recommended that you allow a surface interval of at least 2 hours before reentering the water. If you exceed the maximum 24 hour period allowable oxygen exposure (dose), you must allow a surface interval of at least 24 hours before reentering the water. X G EN O During this time, the Plan Mode will only display the letters O2 (Fig. 66) Fig.
Atmos Pro/Aeris 300G will enter the red Danger zone and the full bar graph will flash as a warning (Fig. 68). The Aeris 300G will emit one beep per second. In the event the O2 Bar Graph enters the red danger zone, you must immediately focus on making a safe controlled ascent to the surface to prevent further exposure. As your accumulation decreases during your surface interval, the O2 bar graph will gradually recede into the yellow Caution zone and green (Normal) zone.
ticipated this possibility and are prepared for it. This is an important reason to avoid pushing the No Decompression and Oxygen Tolerance Limits, and a critical reason to avoid entering decompression. Regardless of your diving habits, Aeris advises you to dive with additional backup instrumentation that can provide the data necessary to properly surface if and when your primary instruments fail. As with any other piece of equipment, unforeseen things can happen.
Atmos Pro/Aeris 300G CARE and MAINTENANCE 67
CARE AND CLEANING The Atmos Pro/Aeris 300G is a sensitive electronic instrument. Although it has been designed to withstand the rigors of diving, it still must be handled carefully to protect from shock, excessive heat, chemical attack, and tampering. The housing is made of an impact resistant resin that is extremely shock resistant but is susceptible to chemical attack and scratches.
Atmos Pro/Aeris 300G AFTER A DIVE Soak and rinse the unit in fresh water following each dive, and check the low pressure sensor guard cap to ensure that it is free of any debris or obstructions. If possible, use lukewarm water to dissolve any salt crystals. Salt deposits can also be dissolved using a slightly acidic vinegar/water bath. After removal from a fresh water bath, place the unit under gently running water and towel dry before storing. Transport your unit cool, dry, and protected.
The costs of annual inspections are not covered under the terms of the 2 year limited warranty. WARNING: If you are in doubt about the accuracy of your Atmos Pro/Aeris 300G depth readings, DO NOT attempt to dive with it until it has been inspected by Aeris Customer Service. HOW TO OBTAIN SERVICE Aeris Customer Service 14212 Doolittle Dr. San Leandro, Ca. 94577 (510) 346-0010, 8 to 5 PST Fax: (510) 346-0015 Website: HTTP:// WWW.diveaeris.com E-mail: info@diveaeris.
Atmos Pro/Aeris 300G BATTERY LIFE The unit's battery consumption rate varies throughout periods of operation, which begin upon activation and continue for 24 hours after surfacing from a dive. The exact number of dives, or hours of operation, that you will obtain with a set of batteries is subject to variables such as, the number of dives conducted during an operational period, the manufacturer, model and age of the batteries actually used, and use of the backlight.
LOW BATTERY CONDITION During Surface Mode(s), voltage level is checked every 10 minutes. If a low battery condition is sensed, a Battery icon will appear to allert you (Fig. 70a). Upon decreasing to a voltage level that will not maintain proper unit operation, the icon will flash for 5 seconds followed by shut down of the unit. If the condition is sensed prior to a dive or during the first 2 hours after surfacing, the icon will appear while Surface Mode is displayed.
Atmos Pro/Aeris 300G R1 MODULE REMOVAL FROM BOOT ATMOS PRO Wrist or Hose Mount Boot - peel the lips of the boot downward off the module while applying pressure from underneath, working it out slowly. Console - bend the rubber console boot back to expose the edge of the module. If the boot is flexible enough to permit, you may bend it back far enough to scoop the module out with your index finger. Otherwise, it may be necessary to insert a blunt screwdriver until the tip rests just underneath the module.
b e d BATTERY REMOVAL c HAN a D HTEN TIG WARNING: The following procedure must be closely adhered to. Damage due to improper battery replacement is not covered by the Atmos Pro/Aeris 300G limited 2 year warranty. The battery compartment should only be opened in a dry and clean environment, with extreme care taken to prevent the entrance of moisture or dust. USE COIN ONLY 0PEN Fig.
Atmos Pro/Aeris 300G • Closely check the threads of the battery hatch and the housing for any signs of damage which might impair proper threading. If found, return your module to your Authorized Aeris Dealer, and DO NOT attempt to use it until it has received factory service. WARNING: DO NOT attempt to disassemble any other portion of the module. Doing so may cause a dangerous malfunction, resulting in possible injury or death. Indication of tampering with the module will also void the unit's warranty.
• Flush the battery hatch and compartment with a solution of 50% white vinegar and 50% water. Rinse with fresh water, and allow to air dry overnight or blow dry with a hair dryer set at no heat. BATTERY INSTALLATION Battery Hatch (+) (-) (+) (-) Batteries Btm Housing Top Fig. 72 - Installing Batteries 76 • Lightly lubricate the battery hatch o-ring, then stretch it slightly to work it up over the slotted top of the hatch, DO NOT roll it over the threads.
Atmos Pro/Aeris 300G • Carefully insert the battery hatch into the housing and turn it slowly clockwise by hand to ensure correct threading. Turn until snug, then apply a coin and tighten until secure, so the outer surface of the battery hatch is flush with the outer surface of the housing. INSPECTION R1 • Activate the unit and watch carefully as it performs a full diagnostic and battery check and enters Surface Mode.
• Correct the alignment of the module as needed so that it is straight. • Press the module completely into place with your thumbs, watching the alignment, until it snaps into place. AERIS 300G R1 c a b d • Grasp the dual gauge unit with your right hand and push it into (toward the left) the boot feeding the hose fitting into the handle of the boot. • Pull the right side of the boot up/over the right edge of the computer module, and ensure it is evenly seated around the dual gauge.
Atmos Pro/Aeris 300G REFERENCE 79
MORE ABOUT FLYING AFTER DIVING In 1990 the Undersea and Hyperbaric Medical Society (UHMS) published a set of guidelines aimed at minimizing the possibility of decompression sickness due to flying too soon after diving. The UHMS suggests* divers using standard air cylinders and exhibiting no symptoms of decompression sickness wait 24 hours after their last dive to fly in aircraft with cabin pressures up to 8,000 feet. (2,440 meters).
Atmos Pro/Aeris 300G Both the UHMS and DAN agree that “There can never be a flying after diving rule that is guaranteed to prevent decompression sickness completely. Rather, there can be a guideline that represents the best estimate for a conservative . . . surface interval for the vast majority of divers. There will always be an occasional diver whose physiological makeup or special diving circumstances will result in the bends”.
Atmospheric pressure decreases as altitude increases above sea level. Weather systems and ambient temperature also affect barometric pressures. Consequently, depth reading instruments that do not compensate for the decrease in pressure indicate depth readings shallower than the depth they are actually at. The Atmos Pro/Aeris 300G automatically compensates for decreased ambient pressure when activated at high altitudes up to 14,000 feet (4,267 meters).
Atmos Pro/Aeris 300G MORE ABOUT NITROX DIVING WARNING: Diving with enriched nitrogen-oxygen (nitrox) mixtures requires special knowledge of the variations imposed upon divers, their activities, and their equipment by the increased percentage of oxygen. Aeris recommends completion of a specialized Nitrox training course by a recognized training agency prior to diving with any enriched nitrogen-oxygen (nitrox) mixtures.
certified by a recognized training agency to teach diving with nitrox. The Atmos Pro/Aeris 300G is not intended for use by military or commercial divers. WARNING: In the event that you exceed the maximum limit of per dive allowable oxygen exposure (dose), it is recommended that you allow a surface interval of at least 2 hours before reentering the water.
Atmos Pro/Aeris 300G No. of Segments Tissue Half-Time FT YG EN NIT R O X G EN etc. O etc. FT MAX FT No.
Depth feet (meters) Atmos Pro Aeris 300G NDL-mins. Eng (Metric) U.S. Navy NDL -mins.
Atmos Pro/Aeris 300G of statistical data, Atmos Pro/Aeris 300G decompression predictions are based on U.S. Navy theory. Therefore, pay special attention to the following warnings. CONCLUSION The Atmos Pro/Aeris 300G is an informational tool whose entire worth depends on understanding all of its features and functions, and using it correctly. Learn how to use it and use it wisely. Be a responsible diver! O DI RESP WARNING: Using the Atmos Pro/Aeris 300G, just as using the U.S.
SPECIFICATIONS NO DECOMPRESSION MODEL OPERATIONAL MODES Basis: • Modified Haldanean Algorithm • 12 tissue compartments • • • • • • Data Base: • Diving Science and Technology (DSAT) - Rogers/Powell Performance: • Tissue compartment halftimes (in mins.
Atmos Pro/Aeris 300G SPECIFICATIONS (continued) DISPLAY RANGE/RESOLUTION Numeric Displays: • Dive Number • Depth • Maximum Depth • FO2 Set Point • PO2 Value • Dive Time Remaining • Total Ascent Time • Decompression Stop Time • Elapsed Dive Time • Surface Time • Dive Log Surface Interval • Time to Fly • Time to Desaturate Range: Resolution: 0-9 1 0 - 330 ft (0 - 99.5 m) 1 ft (.5 m) 330 ft (99.5 m) 1 ft (.5 m) 21 - 50 % 1% 1.40 - 5.00 ATA .01 ATA 0 - 9 hr. 59 min. 1 minute 0 - 9 hr. 59 min.
SPECIFICATIONS (continued) OPERATIONAL PERFORMANCE (continued) ACCESSORIES Altitude: • Operational from sea level to 14,000 feet (4,267 meters) elevation • Recalibration of depth readings from 'feet of sea water' to 'feet of fresh water' when higher than 2,000 feet (610 meters) elevation Optional items available from your Authorized Aeris Dealer: • P/N 10.
Atmos Pro/Aeris 300G RESPONSIBLE COMPUTER DIVING Since the advent of dive computers, it is a common mistake to assume that the old traditional rules of diving no longer apply, but the truth is just the opposite. Before you dive using your Atmos Pro/Aeris 300G, keep these basic rules in mind: • Plan each dive, and dive your plan - Your computer was not designed to make decisions for you, only to provide you with the information you need to make responsible decisions for yourself.
GLOSSARY The following are diving terms to become familiar with. Some apply specifically to the Atmos Pro/Aeris 300G. Air Dive - A dive conducted using air (approximately 21% oxygen & 79% nitrogen) as the breathing gas. Algorithm - A step-by-step mathematical formula designed to accomplish a particular result (i.e. Dive Time Remaining in the Atmos Pro/Aeris 300G). Altitude Dive - A dive made at an elevation above sea level (2,000+ ft. / 610+ m.) where a different set of no decompression tables is used .
Atmos Pro/Aeris 300G GLOSSARY (continued) Decompression Ceiling - The shallowest depth a diver may reach upon ascent without risking decompression sickness. Decompression Stop - The depth(s) at which a diver must pause during ascent to allow absorbed nitrogen to escape naturally from the tissues. Depth Sensor - an electro-mechanical device that converts water pressure into an electrical signal, that is converted to a visual depth display.
GLOSSARY (continued) Multiplexing Display - A display on an instrument that alternates to show different information relating to separate events. Multi-level Dive - A type of dive profile where the diver spends various times at different depths (opposite of a “Square Wave” dive profile). Nitrogen Bar Graph - A graphic display of simulated nitrogen absorption on Aeris dive computers. Nitrox - A nitrogen-oxygen breathing gas mixture that contains a higher fraction of oxygen than air.
Atmos Pro/Aeris 300G GLOSSARY (continued) Square Wave Dive - A type of dive profile where the entire dive is spent at one depth between descent and ascent. Tissue - See Compartment. Tissue Compartment - See Compartment. Transducer - An electro-mechanical device in a dive computer that acts as a depth or pressure sensor. Transition Period - The first 10 minutes of surface time after ascending above 3 feet (1 meter) from a dive.
SERVICE RECORD Date of purchase ______________ Never pressure test the Atmos Pro or Aeris 300G in an air environment. Doing so may damage the depth sensor; possibly resulting in erroneous depth or time readings. 96 N SI LE B Purchased from _______________ Below to be filled in by an Authorized Aeris Dealer: Date WARNING O VER Serial Number ________________ RESP SERVICE NOTE It is possible to damage the Atmos Pro/Aeris 300G depth sensor if it is not pressure tested properly.
Atmos Pro/Aeris 300G THE CODE OF THE RESPONSIBLE DIVER AS A RESPONSIBLE DIVER I UNDERSTAND AND ASSUME THE RISKS I MAY ENCOUNTER WHILE DIVING.
© 2002 Design 1997 Doc. No.
