User Guide
www.diverite.com
Date of purchase:
NiTek Duo Dive Computer
Page 1: ...User Guide www diverite com Date of purchase NiTekDuoDiveComputer NiTekDuoDiveComputer ...
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Page 3: ...ive Rite s website www diverite com All warranty repairs international or domestic must be accompanied by a copy of the purchase receipt For warranty repairs international or domestic the product must be returned to the store where the item was purchased or directly to Dive Rite A Return Authorization must be obtained by calling Dive Rite corporate offices 386 752 1087 to send items to Dive Rite N...
Page 4: ...k Duo 9 Getting started 10 Accessing display modes and screens 11 Time display mode 12 Dive option set and display mode 14 Plan mode 24 Dive computer mode 26 Gauge mode 34 Log mode 36 Profile mode 38 PC transfer mode 40 Surface mode upon surfacing from a dive 41 Altitude operation 43 Chapter 3 Care and maintenance 45 Proper handling techniques 46 Low battery warning 48 Index 51 ...
Page 5: ...mary This chapter provides an overview of the NiTek Duo lists the NiTek Duo s features and functions and covers warning information that should be read before using your NiTek Duo Content Overview 2 Features and functions 3 Specifications 5 Warnings 6 When diving 7 ...
Page 6: ... read display providing simple and direct communication between the diver and the computer With an easy to read display the diver has no problem following and reading the displayed information The NiTek Duo comes standard with a number of modes including a time mode dive set mode dive plan mode log mode profile mode PC transfer mode and dive mode Note It is extremely important that you carefully r...
Page 7: ...eet 200 meters when in gauge mode The NiTek Duo automatically adjusts for altitudes up to 19 685 feet 6 000 meters The NiTek Duo displays a variety of data underwater including date time of day current and maximum depths no decompression dive time elapsed and remaining and water temperature The NiTek Duo displays data specifically related to the use of Enriched Air Nitrox EANx including fraction o...
Page 8: ...tors make it easy to determine what display mode or screen you are in at any time The NiTek Duo has a back light to illuminate the screen which can be turned on with the touch of a button The NiTek Duo s memory capability enables it to hold and display log data on up to 30 hours of dive time or 60 dives Detailed dive profile information can be stored for each dive through user programmable sample ...
Page 9: ...m 0 to 599 minutes Ascent rate warning 26 to 52 feet per minute 8 to 16 m Thermometer Measuring range 23 F to 104 F 5 to 40 C Accuracy 4 F 2 C Measurement interval Every minute Clock Accuracy 30 sec on average per month 24 hour display Altitude Altitude function monitoring from 0 to 19 685 feet 6 000 m measured every 10 minutes Accuracy 800 feet 250 meters Battery Li MnO2 CR 2032 3V button battery...
Page 10: ... Use of the NiTek Duo in conjunction with Enriched Air Nitrox EANx requires that divers be trained and certified for Nitrox diving The NiTek Duo is not intended for use by commercial or military divers whose activities may take them beyond the commonly accepted depth limits for recreational or technical diving Although the NiTek Duo is capable of calculating decompression stop requirements users m...
Page 11: ...lar factors apply to you use the NiTek Duo and other dive computers or dive tables with even greater caution Little is known regarding the exact nature and causes of decompression illness also known as decompression sickness DCI or DCS Susceptibility to DCI may vary substantially from person to person and from day to day Neither the NiTek Duo nor any other dive table or computer can guarantee that...
Page 12: ...uter Take a back up dive computer or dive tables along with a separate means of monitoring depth and dive time Be aware that the NiTek Duo makes assumptions regarding residual nitrogen based on altitude settings Avoid making abrupt changes in altitude following a dive as doing so may be very dangerous ...
Page 13: ...tting Mix1 and Mix2 percentages 15 Setting the safety factor 16 Setting the dive profile sampling rate 17 Setting for fresh or salt water use 18 Setting the maximum depth alarm 18 Setting the dive time alarm 19 Setting the computer for metric or Imperial operation 19 Understanding FO2 default 20 Using gauge mode 22 Plan mode 24 Dive computer mode 26 Primary underwater screen 26 Secondary underwate...
Page 14: ...and mix2 If you are using gauge mode make sure it is set to gage Make sure that you review the dive plan mode for maximum depths and times for the mixes you are using During a dive Monitor the NiTek Duo throughout your dive for depth and time Monitor the N2 and O2 loading bar graphs Pay attention to any alarms such as an ascent rate warning Follow the no decompression limits or complete the requir...
Page 15: ...e and set which are used to access the different modes and screens To use the buttons simply press the button once or hold the button down depending on what you are trying to do The correct procedure to use is clearly defined in each topic throughout the manual Select button This button is used to select the option field that you want to change Mode button This button is used to select and scroll ...
Page 16: ...ek Duo may display additional information concerning exposure to nitrogen and oxygen desaturation time surface interval time and altitude These items are covered in Surface mode and Altitude operation Setting the time and date Setting the time and date are done in the time set mode You can enter or change the year month day hours minutes and seconds in this mode To set the time and date 1 Press Mo...
Page 17: ... is very easy to return to the time display mode To enter time display mode from another mode 1 Press and hold Mode for two seconds OR 2 Press Mode until time is displayed Activating the back light The NiTek Duo has a back light that illuminates the screen To activate the back light 1 Press either the Select or Set button The back light illuminates for four to five seconds 2 Press either button ag...
Page 18: ...ating in the normal computer mode Dive is displayed on the screen and all computer mode functions operate normally The NiTek Duo dive option set and display mode is used to review and change option settings that pertain to an upcoming dive The operating depth limit when in computer mode is 328 feet 100 meters 12 3 1 5 4 10 2 11 13 Dive option display and set fields for screen one 7 9 6 8 Dive opti...
Page 19: ...fe operating depth maximum for the selected mix These are based on limiting PO2 factors of 1 4 or 1 6 atmospheres respectively 13 Maximum depth and time alarm indicators When you see an indicator symbol the alarm is set to on Max depth symbol Max time symbol To enter dive operation 1 Press Mode until dive is displayed 2 Using the topics that follow set up your desired dive option settings 3 If you...
Page 20: ... safety factor setting Press and hold Set to advance the percentages rapidly The percentage will stop at 21 percent and again at 32 percent 6 When finished press Select to advance to the next option safety factor or to exit press and hold Mode for 1 to 2 seconds to return to time mode Setting the safety factor The safety factor setting is used to add an additional safety margin to the no decompres...
Page 21: ...e and store depth data every 15 seconds during a dive The 15 second sampling rate provides a more detailed dive profile but because it stores more information fewer dives can be stored The 30 second sampling rate enables the computer to sample and store depth data every 30 seconds during a dive The 30 second sampling rate is the computer s default setting The 30 second rate provides a less detaile...
Page 22: ...ng 3 Press Set to toggle between fresh and sea water 4 When finished press Select to advance to the next option max depth alarm or to exit press and hold Mode for 1 to 2 seconds to return to time mode Setting the maximum depth alarm The NiTek Duo has a maximum depth alarm that is activated when the diver reaches the maximum depth that is set When the max depth is reached an audible alarm sounds an...
Page 23: ...me has expired The alarm can be turned on or off and can be set from 10 to 590 minutes To set the dive time alarm 1 Press Mode until dive is displayed and flashing on the screen 2 Press Select until the screen changes and dive time is flashing 3 Press Set to set the time when you want the alarm to sound 4 Press Select The dive time alarm on off flashes 5 Press Set to toggle the alarm on and off 6 ...
Page 24: ...void such situations by presenting information and warnings regarding current PO2 levels and cumulative exposure to elevated PO2s To do so the NiTek Duo must be set to an FO2 that accurately matches the concentration of oxygen in the gas mixture being breathed Similarly the NiTek Duo is designed to help divers avoid decompression illness by providing no decompression limits NDLs or mandatory decom...
Page 25: ...computer assumes that subsequent dives will be made on Nitrox Thus to protect you from accidentally diving a Nitrox mixture that cannot accurately be monitored the computer s FO2 setting defaults at midnight it does not default at midnight if you are under water Dealing with FO2 default The best way to deal with FO2 default is to simply avoid it Make sure that prior to every dive you check the FO2...
Page 26: ...s displayed on the screen and exposure to nitrogen and oxygen and no decompression limits are not tracked and no bar graphs are displayed This mode is used by divers who are relying solely on dive tables for decompression information The operating depth limit when in gauge operation is 656 feet 200 meters Note You cannot select gauge operation if the computer calculates that there is still residua...
Page 27: ...oggle between sea and fresh 5 Press Select to set the max depth alarm Press Set to change the depth The alarm turns on with on displayed above the depth 6 Press Select to turn max depth alarm on or off 7 Press Select to set the dive time alarm Press Set to change increase the time in 10 minute intervals The alarm turns on with on displayed above the depth 8 Press Select to turn the dive time alarm...
Page 28: ...foot 3 meter increments Fourteen different dive plan depth increments can be displayed to a maximum depth of 160 feet 48 meters 2 No decompression limit NDL Depending on the depth displayed and the current FO2 setting the available no decompression limit up to a maximum of 200 minutes is displayed If the computer is in FO2 default a series of horizontal lines appears If the NiTek Duo calculates th...
Page 29: ... you want to exit plan mode press and hold Mode for 1 to 2 seconds to return to time mode WARNING Do not plan dives to depths deeper than those for which the NiTek Duo is capable of displaying an available no decompression limit Doing so could cause you to exceed the no decompression limits or a limiting PO2 of 1 4 atmospheres 1 6 atmospheres for deco This may increase your risk of decompression i...
Page 30: ...toggle between and you can switch from mix1 to mix2 when needed You can also activate the back light feature Primary underwater screen When you enter the water the primary screen shows your depth remaining no decompression limit dive time PO2 for selected mix N2 and O2 bar graphs and the ascent rate bar graph 4 1 2 3 7 6 5 1 Remaining no decompression limit NDL This is the time that is remaining i...
Page 31: ...rbed There are a maximum of nine bars When all bars are displayed it means that you are at or have exceeded the no decompression limits 7 Ascent rate bar graph This is a visual representation of how fast you are ascending There are a maximum of nine bars When all bars are displayed you have exceeded the maximum safe ascent rate Secondary underwater screen While underwater you can change to the sec...
Page 32: ...only switch gas mixes if the PO2 for the gas mix you are switching to is 1 6 atmospheres or less Also if mix2 is not programmed you can not switch mixes To change gases underwater 1 Press and hold Select for three to four seconds The back light turns on and if you are using mix1 mix2 flashes and is displayed If you are using mix2 mix1 flashes and is displayed 2 Release Select to return to the prim...
Page 33: ...ve 20 feet 6 meters the three minute countdown restarts Warnings while in diving mode While in diving mode there are several warnings that you should be alert to Default warning If either mix1 or mix2 is in default at the beginning of a dive an audible alarm sounds for three seconds If you ascend and set the mix percentages you can restart the dive The Nitrox symbol also flashes which is the best ...
Page 34: ...t to an acceptable rate or you reach 5 feet 1 5 meters If the ascent rate is violated twice the slow symbol appears in log mode after the dive Ascent rate warning with slow displayed and full bar graph PO2 limit warning The PO2 warning indicates that you have exceeded the 1 4 atmospheres and or 1 6 atmospheres for the gas you are breathing If you are using mix1 and exceed a PO2 of 1 4 atmospheres ...
Page 35: ...accounts for the intensity of the exposure but the OLI accounts for both the intensity and length When seven of the O2 s eight bars are displayed the computer s audible alarm sounds for three seconds and OLI flashes for ten seconds If you do not ascend to a shallower depth and all eight of the O2 s bars are displayed the alarm sounds twice again and OLI flashes again OLI continues to flash until t...
Page 36: ...e seconds indicating that you have decompression stop requirements Caution Decompression diving is considered to substantially increase your risk of decompression illness more than dives made within no decompression limits 2 5 6 4 3 1 Decompression warning with deco displayed on the screen 1 Stop symbol The stop symbols displays indicating that you have to stop at the depth displayed 2 Required st...
Page 37: ...ymbol displays when you have decompression requirements Decompression stop violation warning A decompression stop violation warning takes place when you ascend to a shallower depth than the indicated stop depth or if you do not spend sufficient time at the required depth before ascending When you enter this violation the computer s audible alarm sounds and the current depth stop depth stop time an...
Page 38: ...ession limits are not tracked and no bar graphs are displayed This mode is used by divers who are relying solely on dive tables for decompression information The operating depth limit when in gauge operation is 656 feet 200 meters Note To enter and set up gauge mode operation see Using gauge mode While in gauge mode underwater there are two screens you can toggle between The primary screen display...
Page 39: ...ve 3 Temperature This is the lowest temperature reached during the dive 4 Max depth This is the maximum depth reached during the dive To toggle between screens underwater 1 Press and hold Set The back light turns on and the computer switches to the secondary screen 2 Release Set to return to the primary screen ...
Page 40: ...e Each dive is assigned a number beginning with one for the day Each log page displays the log number and the page number making it easy for you to toggle between the dive log pages 7 3 1 2 8 9 6 5 4 Page one for a dive in log mode 12 11 10 13 Page two for a dive in log mode 1 Dive number and page number The first number is the dive number for the day The second number is the log page number Each ...
Page 41: ...ning alarm sounded during the dive 10 Average depth This is the average depth reached during the dive 11 Safety factor This indicates the safety factor that was set and used for the dive 12 Temperature This is the coldest temperature reached during the dive 13 Max depth This is the maximum depth reached during the dive To view a dive log 1 Press Mode until log is displayed on the screen Log is onl...
Page 42: ...te for more information The dive number and date of the dive are displayed when you scroll through the dives This makes it easy to find the dive profile you want to view 2 3 4 1 5 1 Dive log entry number This is the dive number that corresponds to the dive number when in log mode 2 Dive time This tells you at what time during the dive you reached the depth indicated 3 Depth This is the depth that ...
Page 43: ...p through the logged dives To fast scroll press and hold Select Press Select to scroll down through the logged dives To fast scroll press and hold Select 3 Once a dive profile is selected the computer automatically progresses through the different depths and times of the dive Press and hold Select to pause at a certain depth time Release Select to continue progressing through the dive 4 If you wan...
Page 44: ...ve log information to your personal computer using the optional NiTekLogic software and a USB interface To enter PC transfer mode 1 Press Mode until PC is displayed on the screen 2 Transfer the dive log data to your PC 3 To exit PC transfer mode press and hold Mode for 1 to 2 seconds to return to time mode ...
Page 45: ...until the NiTek Duo calculates that it is no longer needed or after 24 hours have passed since the last dive Note If you are making repetitive dives you need to pay attention to your surface interval and use it in conjunction with plan mode This ensures that you stay within no decompression limits 1 4 3 2 5 NiTek Duo showing surface interval time desaturation time no fly symbol and N2 and O2 bar g...
Page 46: ...mbol when displayed indicates that you should not fly or go to any altitude higher than the one you are diving in until it disappears from the screen When the computer finishes calculating your desaturation time and your surface interval time is over 12 hours the no fly symbol turns off If the computer finishes calculating your desaturation time and your surface interval time is not over 12 hours ...
Page 47: ... 5 906 feet 700 to 1 800 meters 4 593 to 8 530 feet 1 400 to 2 600 meters 7 546 to 19 685 feet 2 300 to 6 000 meters E Out of range above 19 685 feet 6 000 meters Prior to using the NiTek Duo at altitudes substantially above sea level you should find out what the actual altitude of your dive site is Make certain that the altitude settings the NiTek Duo displays accurately match the altitude you ar...
Page 48: ...gen bar graph may show that there is excess nitrogen present even though you may not have made any dives in the preceding 24 hours If you have obtained the altitude specialty diver training which everyone should do before diving at altitudes substantially above sea level you already understand that this should be expected By ascending to a higher altitude from a lower one your body has more nitrog...
Page 49: ... User Manual 45 Chapter 3 Care and maintenance Summary This chapter provides care and maintenance and battery information for the NiTek Duo Content Proper handling techniques 46 Low battery warning 48 Replacing the battery 48 ...
Page 50: ...rt your NiTek Duo on an aircraft or take it to altitude while it is sealed in an air tight container Doing so may interfere with its ability to correctly read display and track depth information The NiTek Duo s Liquid Crystal Display LCD may darken if left in a hot environment such as on a car s dashboard It will return to normal once allowed to cool however extensive exposure to heat may shorten ...
Page 51: ...the NiTek Duo Do not use the NiTek Duo in hyperbaric chambers if the device is not fully submerged in water Always rinse the computer with freshwater after use Store the NiTek Duo in a cool dry location After diving wipe the computer dry and store it in a location separate from other damp items ...
Page 52: ...eplaced promptly A depleted battery that is left in a NiTek Duo for a long period of time may leak Replace batteries promptly Replacing the battery Battery replacement is an easy operation that can be done by the user The battery must be replaced whenever the low battery symbol fixed or blinking is displayed Note When you replace the battery all data regarding desaturation time and date etc is los...
Page 53: ...e off any sand or dirt from the cover and o ring 3 Remove the battery 4 Replace the battery making sure that the polarity is correct For correct battery size refer to Specifications 5 Place a thin layer of silicone grease on the cover o ring 6 Screw the battery cover back into place Do not over tighten 7 Reset the time and date ...
Page 54: ...Care and maintenance 50 NiTek Duo Dive Computer User Manual ...
Page 55: ...attery warning 48 replacing 48 Buhlmann 5 button operation 11 C care and maintenance 45 proper handling techniques 46 clock 5 computer mode 26 options 14 using 14 current depth 27 gauge mode 34 D date and time 3 deco symbol 33 decompression 4 decompression stop violation warning 33 decompression warning 32 default mode time mode 12 default warning 29 depth 3 depth sensor 5 desaturation time 42 des...
Page 56: ...ns underwater 35 guage mode 22 selecting 22 I Imperial 4 15 L log 4 log mode 36 viewing 37 M maximum depth 27 gauge mode 35 log mode 37 maximum depth alarm 15 description 18 gauge mode 22 setting 18 maximum time alarm description 19 gauge mode 22 setting 19 measurement Imperial 15 metric 15 metric 4 15 metric or Imperial description 19 setting 19 mix1 and mix2 5 14 15 27 changing underwater 28 mod...
Page 57: ... or fresh water use gauge mode 22 salt water 15 select button 11 set button 11 setting dive options 14 fresh or salt water use 18 maximum depth alarm 18 maximum time alarm 19 metric or Imperial 19 profile sampling rate 17 safety factor 16 time and date 12 size and weight 5 specificatons 5 stop depth 32 stop symbol 32 stop time 33 surface interval time 41 surface mode 41 T temperature 27 gauge mode...
Page 58: ... 54 NiTek Duo Dive Computer User Manual decompression warning 32 default warning 29 diving mode 29 low battery warning 48 oxygen limit 31 PO2 limit warning 30 water fresh or salt 4 salt or fresh water use 18 ...
