Dive Rite Nitek Duo User Manual
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Dive Rite Nitek Duo User Manual

Dive rite nitek duo dive computer user guide
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NiTek Duo Dive Computer
NiTek Duo Dive Computer
User Guide
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  • Page 1 NiTek Duo Dive Computer NiTek Duo Dive Computer User Guide Date of purchase: www.diverite.com...
  • Page 3 All further claims, especially for damage after diving accidents, are excluded from coverage under this warranty. Dive Rite has no obligation to honor any extension of this warranty. This warranty is in lieu of all other warranties, expressed or implied.

  • Page 4: Table Of Contents

    Overview • 2 Features and functions • 3 Specifications • 5 Warnings • 6 Chapter 2 Using the NiTek Duo • 9 Getting started • 10 Accessing display modes and screens • 11 Time display mode • 12 Dive option set and display mode • 14 Plan mode •...

  • Page 5: Introduction

    Chapter 1 Introduction Summary 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 •...

  • Page 6: Overview

    The NiTek Duo dive computer is a multifunctional computer for recreational diving, providing information on depth, dive times, no-decompression and decompression times, and nitrogen and oxygen absorption and elimination during all dive phases, including ascent, surface interval times, and subsequent dives.

  • Page 7: Features And Functions

    • The NiTek Duo is capable of functioning up to a depth of 328 feet (100 meters) when in dive computer mode and 656 feet (200 meters) when in gauge mode •...
  • Page 8 Special mode indicators 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 •...

  • Page 9: Specifications

    O2 setting range: Mix1 21 to 50 percent, Mix2 21 to 99 percent O2 setting: 1% increments Dive log Dive logging: Maximum of 60 dives Profile logging: Maximum of 30 hours Profile sampling rates: 15 or 30 seconds NiTek Duo Dive Computer User Manual...

  • Page 10: Warnings

    • The NiTek Duo is designed for use by one diver at a time. Divers should not share a single NiTek Duo—or any other dive computer—on the same dive. Additionally, no diver...

  • Page 11: When Diving

    DCI. Use your NiTek Duo conservatively and in conjunction with other dive planning devices, such as dive tables. Do not rely on the NiTek Duo, or any similar device, as your sole means of avoiding decompression illness.
  • Page 12 (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: Using The Nitek Duo

    Chapter 2 Using the NiTek Duo Summary This chapter provides topics about using, setting, and understanding each of the modes and options of the NiTek Duo. Content Getting started • 10 Accessing display modes and screens • 11 Button operation • 11 Time display mode •...

  • Page 14: Getting Started

    Using the NiTek Duo Getting started The NiTek Duo has many modes and screens and a number of options that can be changed depending on your dive location and profile. The following is a checklist of general things that you should pay attention to before, during, and after a dive.

  • Page 15: Accessing Display Modes And Screens

    Set button: This button is used to set an option’s setting, such as setting the date Select Mode The front of the NiTek Duo, showing the three buttons that are used to access and setup the different modes and screens NiTek Duo Dive Computer User Manual...

  • Page 16: Time Display Mode

    Using the NiTek Duo Time display mode Time display mode is the NiTek Duo’s default mode. The computer returns to this mode automatically upon surfacing from a dive and from other modes when a period of time has passed without any buttons being pressed.

  • Page 17: Entering Time Display Mode From Another Mode

    —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.

  • Page 18: Dive Option Set And Display Mode

    Using computer mode Computer mode is when the NiTek Duo is operating 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.

  • Page 19: Setting Mix1 And Mix2 Percentages

    • Mix1 can be set for 21 to 50 percent oxygen • Mix2 can be set for 21 to 99 percent oxygen NiTek Duo Dive Computer User Manual...

  • Page 20: Setting The Safety Factor

    Calculations are based solely on its built-in algorithm (Buhlmann ZH-L16) Calculations are based on one altitude rank higher than the dive was actually made Calculations are based on two altitude ranks higher than the dive was actually made NiTek Duo Dive Computer User Manual...

  • Page 21: Setting The Dive Profile Sampling Rate

    2 seconds to return to time mode. Setting the dive profile sampling rate The NiTek Duo allows you to choose how frequently it samples and stores depth data. The data it samples and stores is used in profile mode or when the data is uploaded to a personal computer.

  • Page 22: Setting For Fresh Or Salt Water Use

    Using the NiTek Duo Setting for fresh or salt water use The NiTek Duo is capable of operating using fresh or salt water calculations. This is based on: • One atmosphere of saltwater is 33 feet (10 meters) • One atmosphere of freshwater is 34 feet (10.3 meters) Before going diving, set the computer to the type of water you are diving in.

  • Page 23: Setting The Dive Time Alarm

    Setting the dive time alarm The NiTek Duo has a dive time alarm that is activated when the diver reaches the dive time that is set for the dive. When the dive time is reached, an audible alarm sounds and the screen flashes for three seconds.

  • Page 24: Understanding Fo2 Default

    (NDLs) or mandatory decompression stop information. Again, to do so, the NiTek Duo must be set in a manner that accurately matches the concentration of nitrogen being breathed. When this information is not available, the NiTek Duo attempts to protect divers by basing its oxygen- and nitrogen-exposure calculations on a “worst case”...
  • Page 25 Default warning indicated by Nitrox flashing and a dashed line for mix1 When and how FO2 default occurs One factor in determining if and when your NiTek Duo’s FO2 setting is in default, is whether you set one or both mixes for air or Nitrox.

  • Page 26: Using Gauge Mode

    Nitrox tables. Using gauge mode If you do not want to use the NiTek Duo as a normal “dive computer,” the NiTek Duo has a gauge operation. Gauge operation is when the NiTek Duo is operating simply as a depth gauge and bottom timer.
  • Page 27 “on” displayed above the depth. 8. Press Select to turn the dive time alarm on or off. 9. When finished, press and hold Mode for 1 to 2 seconds to return to time mode. NiTek Duo Dive Computer User Manual...

  • Page 28: Plan Mode

    If the computer is in FO2 default, a series of horizontal lines appears. If the NiTek Duo calculates that there is residual nitrogen present from previous dives, the available no-decompression limits are shorter. Depending on how much residual nitrogen is present, no NDL time may be displayed for some deeper depths.
  • Page 29 Do not plan dives to depths deeper than those for WARNING: 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).

  • Page 30: Dive Computer Mode

    (2) Dive time: This is the time spent (in minutes) underwater, measured from the time you descended below 5 feet (1.5 meters). (3) O2 (OLI) bar graph: This is the oxygen limit index (OLI) that calculates the cumulative effect of your exposure to elevated NiTek Duo Dive Computer User Manual...

  • Page 31: Secondary Underwater Screen

    (1) Temperature: This is the lowest temperature that has been reached during the dive. (2) Maximum depth: This is the maximum depth that has been reached during the dive. (3) Mix2: The percentage that you set for mix2 is displayed. NiTek Duo Dive Computer User Manual...

  • Page 32: Changing Gas Mixes Underwater

    2. Release Set to return to the primary diving mode screen. Changing gas mixes underwater Because the NiTek Duo has the ability to use two different gas mixes (programmed in dive option set mode) during a dive, you need the ability to switch between mix1 and mix2 while underwater.

  • Page 33: Warnings While In Diving Mode

    The Nitrox symbol also flashes, which is the best indication that the computer is defaulted before entering the water. Default warning indicated by Nitrox flashing and a dashed line for mix1 NiTek Duo Dive Computer User Manual...
  • Page 34 Using the NiTek Duo Ascent rate warning The NiTek Duo assumes that you keep your ascent rate within the following limits: Depth range Ascent rate 0 to 19 feet (0 to 5.9 meters) 26 feet (8 meters) per minute 20 to 59 feet (6 to 17.9 meters)
  • Page 35 Oxygen limit index (OLI) warning The NiTek Duo’s oxygen limit index (OLI) reflects the cumulative effect of your exposure to elevated partial pressures of oxygen. The PO2 warning only accounts for the intensity of the exposure, but the OLI accounts for both the intensity and length.
  • Page 36 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 stop depth: This is the required decompression stop depth. NiTek Duo Dive Computer User Manual...
  • Page 37 If you do not correct an indicated deco stop violation, Caution: the warnings continue for several minutes after surfacing. At this point, the computer is not usable for the next 48 hours. NiTek Duo Dive Computer User Manual...

  • Page 38: Gauge Mode

    It begins displaying depth and time once you descend below 5 feet (1.5 meters). Gauge operation is when the NiTek Duo is operating simply as a depth gauge and bottom timer. “Gage” is displayed on the screen and exposure to nitrogen and oxygen and no-decompression limits are not tracked, and no bar graphs are displayed.
  • Page 39 (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. NiTek Duo Dive Computer User Manual...

  • Page 40: Log Mode

    Using the NiTek Duo Log mode For each dive, the NiTek Duo stores information, such as depth, time, temperature, etc. in a log. This stored log information can be viewed directly from the NiTek Duo’s screen when in log mode.
  • Page 41 3. Once a dive log is selected, you can use Set and Select to toggle between page one and page two of the dive log. 4. If you want to exit log mode, press and hold Mode for 1 to 2 seconds to return to time mode. NiTek Duo Dive Computer User Manual...

  • Page 42: Profile Mode

    (15-second rate) are displayed for each minute during a dive. (4) Date: The day and month the dive took place. (5) FO2 percentage: This shows the mix number and FO2 percentage of the gas being used at each point during the dive. NiTek Duo Dive Computer User Manual...
  • Page 43 Press and hold Select to pause at a certain depth/time. Release Select to continue progressing through the dive. 4. If you want to exit profile mode, press and hold Mode for 1 to 2 seconds to return to time mode. NiTek Duo Dive Computer User Manual...

  • Page 44: 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. NiTek Duo Dive Computer User Manual...

  • Page 45: Surface Mode (Upon Surfacing From A Dive)

    Oxygen limit index (OLI) bar graph This additional information is displayed on the screen until the NiTek Duo calculates that it is no longer needed or after 24 hours have passed since the last dive. If you are making repetitive dives, you need to pay...
  • Page 46 It is recommended that you wait at least 24-hours WARNING: following any dive before flying in an aircraft or driving to altitude. Failure to allow sufficient surface interval time before doing so may increase your risk of decompression illness (DCI). NiTek Duo Dive Computer User Manual...

  • Page 47: Altitude Operation

    Using the NiTek Duo Altitude operation The NiTek Duo adjusts automatically for diving at altitudes of up to 19,685 feet (6,000 meters). To show that the NiTek Duo has made the altitude adjustment, it displays the altitude settings using symbols representing mountains.
  • Page 48 Do not place the NiTek Duo in dive mode when making sudden, substantial changes in altitude, such as when flying in an airplane. This can be caused by storing the NiTek Duo with wet dive gear, which can touch its external electrical contacts and cause it to enter dive mode.

  • Page 49: Care And Maintenance

    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 NiTek Duo Dive Computer User Manual...

  • Page 50: Proper Handling Techniques

    Do not take it underwater immediately after doing so. • Do not transport 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.
  • Page 51 Care and maintenance • Do not use compressed air to dry 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 •...

  • Page 52: Low Battery Warning

    Always have low batteries replaced 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.
  • Page 53 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. NiTek Duo Dive Computer User Manual...
  • Page 54 Care and maintenance NiTek Duo Dive Computer User Manual...

  • Page 55: Index

    Buhlmann · 5 diving button operation · 11 after a dive · 10 before a dive · 10 during a dive · 10 diving mode · 26 care and maintenance · 45 gauge mode · 34 NiTek Duo Dive Computer User Manual...
  • Page 56 · Imperial · 4, 15 24, 26 no-fly smybol · 42 log · 4 log mode · 36 OLI · 27, 42 viewing · 37 log mode · 36 options computer mode · 14 NiTek Duo Dive Computer User Manual...
  • Page 57 · 22 warnings · 6 salt water · 15 ascent rate · 30 select button · 11 decompression stop set button · 11 violation warning · 33 setting dive options · 14 NiTek Duo Dive Computer User Manual...
  • Page 58 PO2 limit warning · 30 water default warning · 29 fresh or salt · 4 diving mode · 29 salt or fresh water use · low battery warning · 48 oxygen limit · 31 NiTek Duo Dive Computer User Manual...

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