NEMO AIR Dive computer
User’s Guide Nemo Air Dive computer
• TABLE OF CONTENTS
Quick guide 2 DIVING WITH NEMO AIR 8 NEMO AIR DIVE COMPUTER 3 DIVE – AIR 8 IMPORTANT WARNINGS 3 DIVE – EAN 10 RESPONSIBLE DIVING PRACTICES 4 TIME MODE 12 HOW THE NEMO AIR DIVE COMPUTER WORKS 4 SYSTEM MODE 12 HOW THE BUTTONS WORK 4 PLANNING: SCROLLING OF NO DECOMPRESSION LIMITS 13 CHECK THE BATTERY POWER LEVEL 4 LOG BOOK 13 AUTOMATIC SWITCH-OFF 5 PC LINK MODE 14 SETTING PARAMETERS FOR THE NEMO AIR DIVE COMPUTER 5 FAQ 15 MODE: AIR 5 MAINTENANCE 15 WATER (water selection) 5 TECHNICAL/FUNCTIONAL CHARACTERISTICS 17 ALT (altitude) 5 WARRANTY 17 PFACTOR (personal correction factor) 5 DISPOSAL OF THE DEVICE 17 MODE: EAN 5 MODE:BOTTOM TIME 6 SET TANK 6 SET ALARM 7 SET WATCH (setting the watch) 7
• Quick guide
1. Low battery indicator 2. EAN dive indicators 12 13 14 15 16 3. Pressure units of measure 4. Tank pressure / tank volume 5. Air volume units of measure 6. Air time
1 17 7. Tank consumption / O2% indicator 8. Air per minute consumption unit of measure 2 18 9. Uncontrolled ascent icon 3 19 10. Ascent speed percentage indicator 11. Omitted stop indicator 4 20 12. Personal correction factor indicator 13. Altitude indicator 5 21 14. “No fly” indicator 6 22 15. Current depth/maximum depth indicator 16. Time indicator 7 23 Dive time indicator Surface time indicator 8 Desaturation time indicator “No fly” time indicator 17. DEEPSTOP depth indicator 9 18. DEEPSTOP depth warning 10 24 19. SAFETY STOP indicator 20. No-decompression dive indicator (NO DECO) 11 25 Decompression-stop diving indicator (DECO) 21. DECO Time DEEPSTOP countdown SAFETY STOP countdown 26 22. DECO stop depth SAFETY STOP time in minutes 23. Bar graphic showing various information: Ascent rate (NO DECO / DECO) CNS% (NO DECO / DECO) Temperature (NO DECO / DECO) ASC TIME (DECO) SAFETY STOP (DIVE) Indicator DEEPSTOP (DIVE) planning indicator DEEPSTOP countdown Tank reserve alarms (DIVE) Dive type (PREDIVE/DIVE) Set dive computer parameters Date and temperature (in TIME mode) 24. <+> button 25. <–> button 26.
• NEMO AIR DIVE COMPUTER WARNING WARNING Congratulations! Before starting an EAN dive, check that the Never dive alone. Nemo Air cannot Your new Nemo Air dive computer is the dive computer is set to EAN mode, then substitute for a diving buddy. result of the latest Mares technology, and has check the composition of the breathing been designed to guarantee maximum safety, mix you will be using and enter its oxygen efficiency, reliability and long life. percentage in the appropriate setting. WARNING Simple and easy to use, it is ideal for all Entering an incorrect oxygen percentage Do not dive if the readings on the instrument types of dives. will lead to errors in the readouts for: appear irregular or unclear. This manual contains all the instructions • no‑decompression time remaining; for its use. • decompression stop times; Mares thanks you for your choice and urges you • alarm for exceeding the “Maximum WARNING to always practice safe and responsible diving. Permitted O2 Partial Pressure.” Enjoy! Always check the battery power level before starting the dive. No part of this document may be reproduced, WARNING Do not dive if the icon indicates that the battery is low. Replace the battery. stored in a retrieval system, or transmitted The use of oxygen-rich mixtures exposes in any form without the written permission of the diver to different hazards from those Mares S.p.A. associated with compressed air. The WARNING Mares adopts a policy of continuing diver must be aware of these risks and Do not fly within 24 hours of your last dive, improvement, and therefore reserves the right understand how to avoid them. to make changes and enhancements to any of and in any case wait until the Nemo Air the products described in this manual without “NO FLY” warnings turn off. notice. WARNING Under no circumstances shall Mares be held It must be kept in mind that the depth and WARNING responsible for any loss or damage sustained duration of the dive are strictly dependent by third parties deriving from the use of this on the percentage of oxygen in the Never dive to depths greater than instrument. breathable mixture. 40 meters (130 feet) and never take decompression dives with Nemo Air unless you possess the specific license • IMPORTANT WARNINGS WARNING (IANTD, NAUI, PADI-DSAT, PSA, SSI, Only divers who have the necessary TDI, etc.) for deep scuba diving to depths of more than 40 m (130 ft) and fully WARNING certification should use Nemo Air for diving with oxygen-rich mixes (EAN). understand the risks and the skills that Before the dive you must be sure to have Attempting to dive without adequate Nitrox this type of dive requires. This type of dive read and understood the entire manual. training might result in serious injury. can entail a greater risk of decompression sickness, even for the most qualified and experienced divers, and regardless of the WARNING WARNING instrumentation or computer used. Divers Correctly setting the tank volume is During dives in cold water, air attempting these types of dives must have essential for obtaining a precise indication consumption could be higher than completed a specialist course and gained of the breathing rate. during standard dives. Consult the gauge the necessary experience. indications frequently. WARNING WARNING WARNING When using oxygen rich (EAN) mixtures, Mares recommends that divers never you are advised to replace the high During dives that include greater exceed the maximum permitted depth for pressure (HP) hose every two years. physical exertion than standard dives, air their qualification. Dives deeper than 40 m consumption could be higher. Consult the or outside the safety curve (decompression gauge indications frequently. dives) significantly increase the risk WARNING of decompression sickness. Always ascend several minutes before going into The high-pressure gaskets on Nemo Air WARNING must be lubricated exclusively with oxygen- DEC mode, and allow yourself even more compatible grease. Using other types of Check the position of the hose to avoid the time in the case of cold water conditions, lubricants in the presence of oxygen-rich risk of entanglement. repetitive dives deeper than 60 ft (18 m), mixtures may spark an explosion. or for any dive involving unusually high exertion. Failure to do this will increase WARNING your risk of decompression sickness. WARNING The Nemo Air dive computer is designed The air used in the tank must comply exclusively for recreational sports use and WARNING with the EN 12021 European standard. not for professional applications. For safety reasons, mixtures other than Do not use Nemo Air, or any other dive that indicated may not be used. WARNING computer, for repetitive “square profile” dives (dives to the same or nearly the The dive computer cannot ensure against WARNING same depth) deeper than 60 ft (18 m). possible decompression sickness. The dive This is an unsafe diving practice which Do not under any circumstances use EAN computer cannot take into account the will greatly increase your risk of mixes with oxygen percentages greater physical condition of the individual diver, decompression sickness regardless of the than 50%. In the event of use with mixtures which may vary from one day to the next. information provided by Nemo Air. contaminated with oil, the entire system For your safety, have a general medical must be cleaned by trained personnel. check-up before undertaking a dive.
Nemo Air Dive computer
have been specifically trained in this type of WARNING technical diving. Before diving, make sure you have • Avoid repetitive “square profile” dives (dives to correctly set the units of measurement. An a single depth) deeper than 18 m (60 ft). incorrect setting may give rise to confusion • Always wait at least 12 hours, and preferably during the dive, and hence to underwater 24 hours, after a dive before flying, in behavior errors. accordance with the recommendations of the Divers Alert Network (DAN).
WARNING Flyng after dives Do not dive in mountain lakes without Mares Dive computers give the follow infor- FIG. 3 having first checked that the appropriate mation: • <+> button, located on the right: scroll altitude program is selected. • Single no-decompression dive: a minimun no-fly time of 12 hours is suggested forward. • Single dives with decompression stops: • <-> button, located on the left: scroll WARNING a minimun no-fly time of 24 hours is backward. •
• Always plan your dives in advance. • Never exceed the limits of your skill and experience. • Go to your deepest planned depth at the beginning of the dive. • Check your computer frequently during the dive. • Comply with the ascent rate indicated by the FIG. 1 computer. Press any button to turn Nemo Air on. • Always do a safety stop between -6 and -3 m The Mares icon appears, followed by the FIG. 4 (-20 and -10 ft) for at least 3 minutes. welcome message, which you can skip by • BATTERY: OK; • After any decompression stops, ascend very pressing a button. After the message, the • BATTERY: LO1; slowly to the surface. computer enters the DIVE operating mode • BATTERY: LO2. • Avoid yo-yo dives (repeatedly ascending and (figure 2). descending underwater). • Avoid strenuous activity during the dive and If Nemo Air detects a low charge level (LO1), for half an hour after surfacing. the battery icon turns on and the display • When diving in cold water or after an backlight function is disabled. When the icon intense exertion, start ascending well before first appears, replace the battery as soon as reaching the no-decompression limits. possible. • In the case of a decompression dive, prolong the decompression stop nearest the surface WARNING for safety. If backlighting has been disabled due • Repetitive dives should be separated by a to low temperature, you can repeat the surface interval of at least 2 hours. FIG. 2 battery status check by entering STATUS • Your deepest dive should be the first one of mode. If the battery icon disappears, the the day. Using the three buttons, you can easily navigate backlighting function has been re-enabled. • Avoid diving until the computer memory has among the functions in the computer. cleared from the preceding day’s dive. If the charge has reached the minimum value • When doing repetitive dives for several (LO2), the battery icon remains on and flashes, consecutive days, take at least one day off HOW THE BUTTONS WORK all Nemo Air functions are disabled, and only from diving every week. The buttons are used the same way in every SYSTEM mode can be accessed. • In the case of decompression-stop diving, operating mode (figure 3). it is recommended to take one day off from diving every three days. • Avoid decompression-stop dives and do not dive deeper than 40 m (130 ft) unless you
Use the <+> and <-> buttons to select the type WARNING of water in which you will be diving. If the charge level reaches the minimum Press the
WARNING FIG. 6 Temperature can noticeably affect battery This will display the MODE menu, and the last voltage. The icon that signals a low battery operating mode will flash: Use the <+> or <-> buttons to enter the level may appear due to low temperatures, • AIR selected altitude program. Press the even if the battery still has sufficient • EAN
Note These settings cannot be changed during PFACTOR AUTOMATIC SWITCH-OFF the dive. Therefore, it is recommended (personal correction factor) that you check all adjustments carefully If Nemo Air is turned on but no button is before each dive. pressed for a certain period of time, it will turn Nemo Air allows you to set an additional off automatically. personal safety factor. This additional safety The delay before automatic switch-off varies factor is suitable for inexperienced divers or depending on the current operating mode. MODE: AIR for when programming demanding dives. The PF0 program introduces no additional This section addresses dives taken with AIR margin of safety. SETTING PARAMETERS FOR breathing mixtures. If you set a value of PF1 or PF2, one of these THE NEMO AIR DIVE COMPUTER two icons Note If you complete an EAN dive, and you DEFAULT SETTINGS wish to take another dive with air, set the Dive mode: air computer to EAN with %O2 at 21%. By so water: fresh doing, the calculation of the % CNS will will be visible during the dive, showing that alt: 0-700 m (0-2296 ft); remain active. the personal factor has been activated, and Pfactor: PF0 indicating its level. Units : metric The following parameters can be set: Tank units: bar/lit • water (salt/freshwater); An indication of the current personal safety Air reserve H alarm: OFF • altitude; program, among PF0, PF1, and PF2, will flash Air reserve L: 50 bar (725 psi) • personal correction factor. (figure 7): Tank vol: 10,0 lit To select the AIR type of dive, press the
Nemo Air Dive computer
Use the <+> and <-> buttons to set the selected Press the
Use the <+> or <-> buttons to enter the desired SET TANK value. Press the
PPO2 (Maximum partial oxygen 1. Set Tank pressure) 1.1. units of measurement: bar-litres / psi- Nemo Air features an alarm that signals the cubic feet diver when oxygen partial pressure reaches 1.2. first alarm: limit value for air reserves, FIG. 11 the limit levels. can be set from 80 bar (1160 psi) to Press
UNITS (unit of measure for the tank) In this setting you can select the unit of measure you wish to use: • units:psi-cubic feet; FIG. 9 • units:bar-liters. As this value changes, Nemo Air will show Entering this section, the unit of measure for FIG. 12 the maximum dive depth compatible with the tank volume will flash (figure 10). the oxygen percentage and maximum partial RESERVE L (minimum reserve) pressure that have been programmed Values can be set from 50 bar (725 psi) to 70 bar (figure 9). (1015 psi) in increments of 10 bar (145 psi). Use the <+> or <-> buttons to enter the desired The default value is 50 bar (725 psi) (figure 13). value.
AUDIO (activate sound) This function enables or disables all audible alarms. When activated, the current setting will be displayed: either “ON” or “OFF” will flash. Use the <+> and <-> buttons to activate or deactivate all the audible alarms. Press the
If the tank pressure drops below the value set Note during the dive, a constant audible alarm will The alarm that indicates a DEEPSTOP sound, the word DANGER will appear on the when applicable is always activated. screen (figure 14), and the tank pressure value will flash. The alarms can be switched off by pressing any button. When the tank pressure Note drops below 30 bar (450 psi) the alarms will be The air RESERVE alarm is always switched on again. The alarms can be switched activated. off again by pressing any button. WARNING The audible alarms should only be FIG. 15-2 disabled by experienced divers, who take full responsibility for this operation. WARNING
In this case, the theoretical pressure FAST ASC (uncontrolled ascent check) (in psi) must be set that gives the tank the This function enables or disables the “Stop” nominal capacity in cu.ft. Do not use the function in case of uncontrolled ascent, real pressure reading on the instrument. to prevent the dive computer from locking Example: tank from 80 cu.ft. to 3000 psi. out after a rapid ascent. The feature can be Even if charged to a pressure other than useful for instructors who need to practice FIG. 14 3000 psi, set 3000 psi on Nemo Air. emergency ascents. Use the <+> and <-> buttons to change the When activated, the current setting will be value in increments of 10 bar (145 psi). The above settings take place as follows: shown: either ON or OFF will flash. Press the
Nemo Air Dive computer
Normalization removes the effect of variations DIVE – AIR: “NO-DECOMPRESSION” DIVE in depth, so that the data displayed gives a direct Once you descend past 1.2 meters (4 feet), indication of the diver’s actual breathing rate. Nemo Air switches to DIVE mode and begins With reference to the above example, the showing dive data. instrument would display a breathing rate of Remaining in this mode for more than 15 liters/min at every depth. 20 seconds will make the computer begin recording the dive details in the LOGBOOK LOW-AIR ALARMS memory. If the measurement of tank pressure drops The following details are displayed (figure 18): below 100 bar, or the set value (RESERVE H), a brief audible alarm will sound and the air pressure value will blink continuously. If the measurement of tank pressure is lower FIG. 16 than 50 bar, or the set value (RESERVE L), a continuous alarm will be triggered, and the Use the <+> or <-> buttons to adjust the values. word DANGER will appear. Press and release the button to change the Pressing any button will clear the alarms. value by one unit at a time, or hold down the When the tank pressure drops below 30 bar buttons to scroll. (450 psi) the alarms will be switched on again. Press the
To enter PREDIVE mode, press the
FIG. 17
To exit this mode and return to the main menu, WARNING press and hold the
WARNING Note When the no‑decompression time When the <+> or <-> buttons are pressed remaining is one minute, an audible alarm during the dive, Nemo Air will temporarily is sounded to indicate that the diver is display the estimated DEEPSTOP required. about to exceed the no-decompression The data displayed during the ascent may limits. vary as a result of the diver’s behavior. Divers should check this data during the ascent for more precise information on the ASC TIME (TIME TO SURFACE) estimated stop. The ASCENT TIME is given by the sum of: • duration of the various decompression FIG. 23 This display indicates that the need for a deep DIVE – AIR: “DECOMPRESSION STOP” DIVE stops; • time required to ascend at an average speed stop during the ascent has been detected. As If the diver does not ascend when the residual of 10 m/min (32 ft/min). the diver nears the depth set for the deep stop, time has expired, Nemo Air switches to • DEEPSTOPS if any. Nemo Air will sound an audible alarm, and will “decompression stop” mode, indicated by display how long the diver must remain at the the appearance of the “DECO” message and DECOMPRESSION STOPS stop depth (figure 24). by an audible alarm. The following data are Nemo Air also checks that the decompression In this mode, the ascent rate is only shown displayed in this mode (figure 20): stops are performed correctly: two icons analogically. graphically indicate what action the diver should take (figure 22).
FIG. 22
• triangles: correct decompression stop depth; • upward triangle: diver below decompression stop depth, ascend; FIG. 20 • downward triangle: diver has ascended FIG. 24 • DECO icon; beyond decompression stop depth, descend. There can be more than one deep stop during • current depth (in “m” or “ft”); If the decompression stop depth is exceeded by a dive. This depends on the dive profile and on • depth of deepest decompression stop more than 30 cm (11 inches), the “downward the type of decompression. (in “m” or “ft”); triangle” icon will flash; if it exceeds 1m (3 ft) • duration of the deepest decompression stop; it keeps flashing and an audible alarm will Note • icons for the altitude program and personal sound. These warnings remain active until the During a dive with Nemo Air, if the correction factor (if enabled); diver returns to the correct depth. DEEPSTOP icon is active, pressing the <+> • actual length of the dive (DIVE TIME) in or <-> button will temporarily display the minutes; WARNING estimated stop required. • ASCENT TIME in minutes; • DEEPSTOP icon (if active); When the omitted deco stop alarms are • ascent rate in analog and digital mode; triggered, desaturation of the simulated DIVE – AIR: ASCENT • tank pressure in bar or psi; tissue compartments is halted and • air time remaining at the current depth; resumes only when the diver returns to WARNING the correct stop depth. • breathing rate in liters/min or cubic feet/min. A rapid ascent increases the risk of decompression sickness. In this mode, the <+> and <-> buttons have the WARNING same function. Pressing the <+> or <-> button will display the following information for a few Never ascend above the correct WARNING seconds (figure 21): decompression stop depth. Disabling the “STOP” on an uncontrolled ascent should only be done by highly Note experienced divers, who take full responsibility If the deco-stop overshoot exceeds one meter for the consequences of this action. and lasts more than three minutes, the computer switches to “Omitted Stop” mode As the diver ascends, Nemo Air activates the and the corresponding icon appears. After the ascent rate control algorithm, displaying the dive, if you wish to dive again before 24 hours value both in m/min (ft/min) and graphically have elapsed, Nemo Air will function only (figure 25). as a depth gauge and timer (BOTTOM TIME mode), and will display the errors. FIG. 21
• maximum depth reached; DEEP STOPS • current time; To minimize the likelihood of critical bubble • application of the PLAN DEEPSTOP icon and seed formation, in the case of decompression the DEEPSTOP level (if activated); dives or dives close to the no-deco limit, • ascent rate in analog and digital mode; Nemo Air prompts for a series of one-minute • temperature (in °C or in °F); deep stops at different depths depending on • tank pressure in bar or psi; the dive profile. Thus, when the applicable • air time remaining at the current depth; conditions exist during the dive, Nemo Air will FIG. 25 • breathing rate in liters/min or cubic feet/min. display a DEEPSTOP icon (figure 23). If the ascent rate exceeds 120% of the Pressing and holding the <+> or <-> key for a few optimal value of 10 m/min (33 ft/min), the seconds will temporarily display the dive settings. word “SLOW” will appear, and Nemo Air will sound an audible alarm that continues until
Nemo Air Dive computer
the ascent rate returns below the maximum • duration of the dive; Use the <+> and <-> buttons to view: allowable speed. At the same time as the • maximum depth; • no-fly time; audible alarm is triggered, the computer • any icons for underwater behavior errors • surf time; begins monitoring an “Uncontrolled Ascent.” (omitted stop, uncontrolled ascent); • time, date, temperature. An ascent is considered “uncontrolled” when • tank pressure at the end of the dive; the diver exceeds the maximum rate for a • average breathing rate for the dive. DIVE – EAN stretch equal to at least two thirds of the depth at which the audible alarm was triggered. WARNING Because of the lower percentage of nitrogen in This criterion only applies to alarms triggered If an AIR or EAN dive ends with an the breathing mix, oxygen-rich mixtures make below a depth of 12 m (39 ft). In case of an uncontrolled ascent or an omitted stop, it possible to extend the no-decompression uncontrolled ascent, upon surfacing Nemo Air Nemo Air will restrict Dive - AIR and Dive - limits, as compared with the same dive with disables the AIR and EAN functions of DIVE EAN modes for 24 hours and will only air. However, the higher oxygen content in mode, and will only function as a timer and allow the BOTTOM TIME operation mode. the mix exposes the diver to oxygen toxicity depth gauge (BOTTOM TIME). hazards which are not generally encountered The stop on the uncontrolled ascent function in recreational dives with compressed air. can be disabled in SET ALARM mode. WARNING In EAN mode, Nemo Air computes oxygen toxicity on the basis of the dive time, the depth, Do not fly or travel to high altitudes while SAFETY STOP and the oxygen percentage setting, providing the no-fly indication remains active. If the maximum depth of a dive exceeds indications that enable the diver to remain 10 meters, a “SAFETY STOP” is activated for within the safe limits for oxygen exposure. the ascent. Nemo Air suggests that divers take Note To dive with an EAN mixture, you must first set a 3-minute safety stop between 2.5 and 6 m The <+> and <-> buttons are disabled in EAN mode in SET DIVE. in depth (8 - 19 ft), and will display the words SURFACING mode. Nemo Air manages dives with EAN using the SAFE STOP. A timer indicates the time needed same procedures as dives with AIR. to complete the stop (figure 26). That means that you will have the same In this mode, the ascent rate is only shown Note functions and procedures for selecting the analogically. To activate the display backlight, press the DIVE mode. The only differences in managing
WARNING FIG. 26 It is essential to correctly set the oxygen If the diver moves outside the percentage in the mix to ensure correct above‑mentioned depth range, the safety stop readouts of: timer is halted. When the diver reenters the • no‑decompression time remaining; correct depth range, the SAFETY STOP timer • decompression stop times; resumes from where it left off. • alarm on exceeding the maximum If the diver returns to a depth below 10 m (32 ft), permitted PPO2. the SAFETY STOP timer will ignore the previously aborted stop and subsequently start counting down from 3 minutes again. In the case of a WARNING decompression-stop dive, the SAFETY STOP extends the duration of the decompression Before the dive, make sure you have stop at 3 m (10 ft) by an additional 3 minutes, correctly set up all the EAN dive displaying the information described previously. parameters: percentage of oxygen in the mix and limit for the partial pressure of DIVE – AIR: SURFACING oxygen, which together determine the When the measured depth is less than 1 m (3 ft), maximum depth of the dive. Nemo Air considers the dive to be suspended (“SURFACING”) and halts the dive timer. If the WARNING diver does not return below 1.2 m (4 ft) within the next 3 minutes, the computer considers the The use of oxygen-rich mixes exposes dive to be finished and records its data in the the diver to different hazards from those LOGBOOK. If the diver does re-descend within 3 associated with compressed air. The minutes, the dive continues and the dive timer diver should be aware of these risks and resumes from where it left off. Data displayed in understand how to avoid them. SURFACING mode (figure 27): WARNING
FIG. 28 Only divers who have the necessary certification should use Nemo Air for • desaturation time (if other than zero); diving with oxygen-rich mixes (EAN). Lack • the NO FLY icon; of appropriate diver training may result in • icons for any errors committed during the serious injury. dive (omitted stop, uncontrolled ascent).
FIG. 27
10 DIVE – EAN: “NO-DECOMPRESSION” DIVE Pressing and holding the <+> or <-> key for a WARNING When the diver descends below 1.2 meters few seconds will temporarily display the dive The user is advised to carefully read the (4 ft) Nemo Air automatically switches to DIVE settings. section on compressed air diving before mode and starts displaying the dive data. reading the section on EAN dives. If this mode persists for more than 20 seconds, WARNING Nemo Air will begin recording the dive details To fully understand how to perform in the LOGBOOK memory. decompression with EAN, the user should DIVE – EAN: CHECKING THE GENERAL The data displayed are shown in figures 30 also carefully read the corresponding DIVE PARAMETERS and 31. section for compressed-air deco stop dives.
OXYGEN PARTIAL PRESSURE When the diver reaches a depth at which the Note
PPO2 exceeds the maximum limit entered The display modes are identical to those in the corresponding parameter (from 1.2 described in the chapter for dives with air. to 1.6 ATM), an alarm condition is triggered, indicated by: If you complete an EAN dive, and you wish to • blinking depth indication; take another dive with air, set the computer • audible alarm. to EAN with %O2 at 21%. By so doing, the The alarm persists until the diver has calculation of the % CNS will remain active. ascended enough for the PPO2 to return to FIG. 30 DIVE – EAN: SURFACING within the programmed limit. When the measured depth is less than 1 m Note WARNING (3 ft), Nemo Air considers the dive to be The display modes are identical to those suspended (“SURFACING”) and halts the dive When the max PPO2 alarm triggers, described in the chapter for dives with air. timer. ascend immediately until the alarm condition ceases. In this case you should If the diver does not return below 1.2 m (4 ft) finish the dive and return to the surface. within the next 3 minutes, the computer Pay attention to respect all indicated considers the dive to be finished and records decompression and safety stops. Mares its data in the LOGBOOK. If the diver does re- recommend not to dive in the follow descend within 3 minutes, the dive continues and 12 hours. the dive timer resumes from where it left off. The data displayed in SURFACING mode are EFFECTS ON THE CENTRAL NERVOUS SYSTEM shown in figure 34. Oxygen toxicity exposure is monitored by means of a CNS (Central System Calculation), based on currently accepted recommendations FIG. 31 for exposure limits. This toxicity is expressed as a percentage value Pressing and holding the <+> or <-> key for a which ranges from 0% to 100%. The percentage few seconds will temporarily display the dive CNS value is shown on the display. settings. An alarm is triggered when it exceeds 75%, signaled by blinking of the value. DIVE – EAN: “DECOMPRESSION STOP” DIVE If the diver does not ascend when the residual DIVE – EAN: PREDIVE time has expired, Nemo Air switches to This operating mode remains active until the “decompression stop” mode, indicated by the FIG. 34 diver goes below 1.2 meters (4 feet). The data appearance of the “DECO” message and by an displayed are shown in figure 29. audible alarm. The data displayed in this mode WARNING are shown in figures 32 and 33. If an AIR or EAN dive ends with an uncontrolled ascent or an omitted stop, Nemo Air will restrict AIR and EAN modes for 24 hours and will only allow the BOTTOM TIME operation mode.
Note The buttons in SURFACING mode are disabled. FIG. 29 FIG. 32 Note Note To activate the display backlight, press the Before every dive, it is advisable to
11 Nemo Air Dive computer
6. System Note 6.1. contrast After a dive in BOTTOM TIME mode, 6.2. keybeep switching to AIR and EAN mode is 6.3. N2erase suppressed for 24 hours. (This lockout 6.4. units can be disabled by clearing the residual 6.5. intro nitrogen memory in SET DIVE - DATA 6.6. SN mode.) 6.7. FW 6.8. HW WARNING 6.9. reset 6.10. battery Users who clear the residual nitrogen memory cannot then use the instrument To enter SYSTEM mode, press the
DIVE – BOTTOM TIME: SURFACE MODE The desaturation time and the delay before flying The first item you can program is the display or traveling to high altitudes are displayed in the contrast. The word CONTRAST is displayed same way as for AIR or EAN dives. with the current contrast value flashing.
BOTTOM TIME WITH BEHAVIOR ERROR CONTRAST The following errors can occur during an AIR In this setting you can adjust the display or EAN dive: contrast. This value can be adjusted, using the • uncontrolled ascent; <+> or <-> buttons, from a minimum of 1 to a • omitted stop. maximum of 15 (figure 39). In this case, Nemo Air will inhibit the use of AIR and EAN modes for 24 hours, allowing operation in BOTTOM TIME mode only, and will continue to display the underwater behavior FIG. 35 error from the previous dive. The icons corresponding to the error committed will be displayed in DIVE, TIME and DIVE - BOTTOM TIME (GAUGE) LOGBOOK modes. In this mode Nemo Air functions as an electronic timer and depth gauge, but does not perform any calculations for no-deco limits or TIME MODE for deco-stop times. In the TIME menu, you can always check Responsibility for planning the no- the current watch data, the date, and the FIG. 39 decompression limits or an adequate temperature. decompression therefore lies entirely with the Press the
FIG. 40 FIG. 36 Use the <+> and <-> buttons to select whether FIG. 38 or not a beep should sound when a button is pressed. Press the
SYSTEM MODE N2ERASE This item is used for clearing the residual In the SYSTEM menu you can set general nitrogen memory of the tissue compartments. parameters and display important information The word “N2erase” will display with the word about Nemo Air: “no” flashing (figure 41). FIG. 37
12 There are three possible values for this WARNING measurement: Before diving, make sure you have • battery: OK; correctly set the units of measurement. An • battery: LO1; incorrect setting may give rise to confusion • battery: LO2. during the dive, and hence to underwater For more information about the level of battery behavior errors. charge, see the section entitled “Check the battery power level”.
INTRO Press the
factor), and, for EAN dives, the %O2 (oxygen FIG. 43 percentage) and the PPO2 (maximum partial oxygen pressure). Use the <+> or <-> buttons to adjust the values. From the Main Menu, use the <+> or <-> Press the
FIG. 41-1
If you do NOT wish to clear the residual Repeatedly press the <+> button to increase nitrogen memory in the tissue compartments, the depth by three meters each time, up to a press the
°C METERS / °F FEET You can select which units of measure you want to use: metric (°C and m) or Imperial (°F and ft). The unit of measure flashing is the current selection (figure 42).
FIG. 45
In this case, the maximum depth allowed in Plan mode will depend on the values entered
for % O2 and maximum PPO2. Press the
FIG. 44 Note • the serial number; The Plan function will only be active after • the software version; having selected AIR or EAN mode in SET FIG. 42 • the hardware version; DIVE. • the number of times the battery has been Use the <+> and <-> buttons to adjust the values. replaced; • the charge level of the battery. When you LOG BOOK enter this section, an automatic battery check is performed, and while the computer LOGBOOK mode is used for viewing the details is measuring power, the string “battery: of past dives on the display. check” will display for a few seconds. The dives are organized as in the pages of a “log book”, with the number “1” assigned to
13 Nemo Air Dive computer
the most recent dive, “2” to the preceding dive, and so forth, until the memory is full. If the memory is full, when the user dives again the oldest record is deleted to free up memory for the new dive. Maximum capacity of approximately 40 hours of diving with profile points at 20-second intervals. To enter LOGBOOK mode, select the corresponding choice in the main menu and press the
FIG. 48 FIG. 50
• maximum depth reached; • current depth; • duration of the dive; • fastest ascent rate; The first page in the LOGBOOK contains a • personal correction factor selected (only • duration of the dive; summary history of dives, with the following AIR, EAN); • “deco” icon for decompression-stop dives information: • selected altitude program (only AIR, EAN); (only AIR, EAN): • maximum depth reached; • “No deco” icon for no-decompression dives • omitted deco stop icon (only AIR, EAN); • total diving time (hours and minutes); (only AIR, EAN); • personal correction factor (only AIR, EAN); • total number of dives done; • “deco” icon for decompression-stop dives • “No deco” icon for no-decompression dives • coldest logged temperature. (only AIR, EAN); (only AIR, EAN); Press the <+> or <-> keys to access the display • omitted deco stop icon (only AIR, EAN); • selected altitude program (only AIR, EAN). for the individual dives (figure 46). • omitted deco stop (only AIR, EAN); • tank pressure in bar or psi; • type of dive: AIR, EAN, BOTTOM TIME; • breathing rate in liters/min or cubic feet/min. • %CNS (only EAN); • coldest logged temperature; Press the
LOG BOOK - DIVE NO. The dives are numbered in order, from the FIG. 49 most recent to the oldest. The following data Press the
• %O2 of the mixture (only EAN). Press the
Note For dives in BOTTOM TIME mode, the uncontrolled ascent and omitted deco stop FIG. 47 icons refer to errors committed during the FIG. 51 preceding dive. • type of dive (AIR, EAN, BOTTOM TIME); Position Nemo Air with the display facing • sequential dive number; upward and plug the interface into the special • start date and time of the dive. port. LOG BOOK– PROFILE More detailed information is available in the Press the <+> or <-> buttons to advance from In PROFILE you can review the profile points of one dive to the next. special software required to communicate with a dive, spaced at 20‑second intervals. Nemo Air. Press and hold the
14 FAQ A: The DEEPSTOP icon only appears during decompression-stop dives or dives very close WARNING Q: What happens if I replace the battery after to the no-decompression limits. The mineral glass is not exempt from a dive before the desaturation time has gone Q: If I begin the DEEPSTOP and then go back scratches resulting from improper use. to zero? down what happens? A: The residual nitrogen memory will be A:If you start the DEEPSTOP and then go back cleared, and the RGBM calculations for any down, the count will stop. It will resume when STORAGE INSTRUCTIONS previous dives aborted. The diver who used the you return to the DEEPSTOP depth. Storage temperature: from -20 to +70° C (- computer in the previous dive must not dive for Q: Why doesn’t Nemo Air turn off after a dive? 4/+158° F). When replacing the hose be careful at least 24 hours. A: If the no-fly period has not expired, after not to damage it by folding it too far (bending Q: What happens if I start a dive while a dive Nemo Air switches to TIME mode and radius not less than 31 mm). Nemo Air is still in SYSTEM mode? shows information about the most recent dive. A: If left in SYSTEM mode when you begin the Q: If I am in PREDIVE with the hose inserted, TRANSPORT INSTRUCTIONS dive, Nemo Air will still activate DIVE mode can I exit PREDIVE to change the settings? No special operations are required for transport. within 20 seconds of descending past 1.5 m A: Even in PREDIVE and when Nemo Air is It can be transported with the rest of your (5 ft). reading the tank data, you can exit this mode equipment, being careful to avoid violent blows. Q: When I replace the battery, will my by pressing and holding the
15 Nemo Air Dive computer
Do not use tools to tighten the Nemo Air WARNING connection. Under no circumstances replace the WARNING hose fitted on the computer with one of a different type; consult your dealer or Attempting to carry out operations in the Mares for information about the type of presence of high pressure may result in hose to be used. serious injury. Connect the threaded 7/16” UNF terminal to a high‑pressure outlet on the WARNING regulator’s first stage (check the regulator FIG. 54 Before pressurizing the instrument, check instruction manual to find out which are that the quick coupling has been correctly the high pressure outlets) and tighten WARNING engaged. (max 4-5 N.m. / 35.4-44.3 lb.in) with a hexagon wrench (14 mm). Before closing the cover, check that the gasket is positioned correctly in its WARNING seat. Make sure it is perfectly clean, and INSTRUCTIONS FOR ATTACHING lubricate it with a thin film of silicone The Nemo Air can only be connected THE COMPASS grease. and subsequently disconnected from the (OPTIONAL COMPONENT, SOLD SEPARATELY) high‑pressure hose after depressurizing With reference to figure 57, the following steps the group. Therefore, if the computer are necessary in order to attach the compass: Note is assembled on the first stage of a 1. Unscrew the 6 screws that fasten the two When applying the silicone grease, be regulator that is already connected to a shells of Nemo Air. careful not to get the battery or contact tank, depressurize the group as described 2. Remove the bottom shell. plates dirty. above. 3. Remove the top shell. 4. Remove the top cover. In order to connect the computer to the hose, Note 5. Fit the compass module. insert the connector attached to the hose into Nemo Air may show a low battery charge 6. Replace the bottom and top shells and lock the connector attached to the computer, and after the battery has been replaced. If this the 6 screws back down. happens, run a battery check by entering then press all the way in (figure 55 and 56): SYSTEM mode. 5
Note Do not discard the old battery in the environment. Mares adopts a policy of 3 respect for the environment, and urges 4 use of the appropriate separated waste collection service.
WARNING Do not replace the battery within the 3 minutes immediately following a dive. 2 Replacing the battery too soon after the dive will result in loss of the data for that 1 dive. In any case, remember that replacing the battery causes the residual nitrogen, FIG. 57 desaturation time and no-fly time data to be lost. It is therefore advisable to make a note of this information before replacing TECHNICAL/FUNCTIONAL FIG. 55 the battery. CHARACTERISTICS
TECHNICAL FEATURES WARNING Do not replace the battery between PRESSURE GAUGE FUNCTION repetitive dives. The pressure gauge integrated with the Nemo Air dive computer has been tested and CE certified by Registered Test Center #0426 - INSTRUCTIONS FOR CONNECTING NEMO AIR ITALCERT, V.le Sarca, 336 - 20126 Milan - Italy TO THE HP HOSE and by - INPP – Entrée n°3 – Port de la Pointe Nemo Air is made up of two distinct elements: Rouge BP 157 -13267- Marseille – France. the computer and the high‑pressure hose, The pressure gauge integrated with the which are connected to each other by means Nemo Air computer is a Category III device of a quick-release coupling designed and as defined under European Directive 89/686/ tested for an operating pressure of 300 bar. CEE, and complies with the specifications set The hose must be connected to the regulator’s out in the harmonized European Standard first stage before the latter is mounted on the EN 250/2000 for use with air compliant with tank: if this operation is carried out when the Standard EN 12021 (oxygen content of 21%). regulator is already assembled on the tank, The pressure gauge is compliant with the make sure that the tank valve is fully closed specifications set forth in the European and that the entire system is depressurized Standard EN 13949: 2003 for use with oxygen- by pressing the purge button on the regulator rich mixtures (Nitrox). FIG. 56 second stage. The EC certification process and verification of the operating performance of the pressure
16 gauge in the Nemo Air dive computer under software can be updated using the USB standards EN 250:2000 and EN 13949: 2003 Note interface (optional) and downloading the are understood to be applicable to a maximum Data refer to calculations performed with software from the Mares web site. depth of 50 m below the surface. the following parameters: The Nemo Air dive computer can be used in Average length of each dive 45 min: cold water (water at temperatures below 10°C). • 12 months of Off-Mode; • WARRANTY • battery life is affected by the operating MARKING temperature; The instrument markings are located on the • at lower temperatures the battery life WARRANTY EXCLUSIONS back of the case, and consist of the following: decreases; • damage caused by water seepage resulting • working pressure rating: 300 bar / 4,350 psi; • the life of the battery will vary from improper use (e.g. dirty seal, battery • reference standard: EN 250/2000; depending on use. compartment closed incorrectly, etc.); • reference marking: CE 0426. • rupture or scratching of the case, glass or strap as a result of violent impact or blows; The conformity marking indicates compliance Algorithm with the essential health and safety • damage resulting from excessive exposure • RGBM Mares-Wienke, the result of a to elevated or low temperatures; requirements as per attachment II D. and collaboration between Dr. Bruce R. Wienke 89/686/EEC. The number alongside the EC • damage caused by improper use of and the Mares Research and Development compressed air with pressure higher than identifies the Notified Body #0426 - ITALCERT Center; V.le Sarca, 336 – 20126 Milan - Italy, authorized the indicated maximun operating pressure, • 10 tissue compartments; 360 bar (5150 psi). to inspect the finished product under art. 11 B • reduction of the permissible gradient D.e. 89/686/CEE. (M factors) in case of repetitive dives, deeper- HOW TO CHECK THE SERIAL NUMBER than-previous dives or multi-day diving; CHARACTERISTICS The serial number is displayed in the System • deep stops; Maximum operating pressure: 360 bar menu. • safety stop; You can access the System option from the (5150 psi). • ascent rate: 10 m/min; Accuracy: The guaranteed accuracy of the main menu using the <+> and <-> keys. • altitude programs: Press the
Software upgrade • if Mares produces new functional characteristics for the Nemo Air, it will be possible to upgrade your computer by updating the software. The Nemo Air
17 cod. 44 2 00717 - 04/08 ArtBooK 367 /08 cod.
Algorithm
Deep Stop
Mares S.p.A. - Salita Bonsen, 4 - 16035 RAPALLO - ITALY - Tel. +39 01852011 - Fax +39 0185669984 www.mares.com