Dive Rite NiTek Duo User Guide

NiTekDuoDiveComputer

UserGuide

Dateofpurchase:

www.diverite.com

Content

DEVELOPED BY

WARRANTY INFORMATION

Dive Rite 175 NW Washington Street Lake City, FL 32055 Phone: 386.752.1087 Fax: 386.755.0613 Web: www.DiveRite.com

You may not reproduce, translate, transcribe, or transmit any part of this manual without express, written permission from Lamartek, Inc. dba Dive Rite.

Dive Rite will—at its sole discretion—repair or replace NiTek Duo components proved to be damaged by faulty manufacture or material, at no cost, for a period of up to one year (365 days) from the date of purchase.

This warranty applies only to the original retail purchaser. It does not cover commercial or rental use, nor does it extend to units purchased from other than an authorized Dive Rite dealer.

This warranty specifically excludes battery depletion or other conditions resulting from misuse, negligence, alteration, accident, or unauthorized repair.

To make a claim under this warranty, the owner must have registered his/her warranty using Dive Rite’s website (www.diverite.com). He or she must then return the damaged items to Dive Rite, along with a copy of the original purchase invoice or receipt. No warranty service will be performed for other than registered owners.

This warranty becomes void if NiTek Duo components are damaged by anything other than normal recreational diving use, or if they have been serviced or repaired by other than authorized Dive Rite dealers.

Repairs made under this warranty will not extend the warranty period.

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. No other person or representative is authorized to assume for Dive Rite any other liability in connection with the sale of this product.

NiTek Duo Dive Computer User Manual i

Content

Table of contents

Chapter 1 Introduction • 1

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 • 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

ii NiTek Duo Dive Computer User Manual

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 • 5 Warnings • 6

When diving… • 7

NiTek Duo Dive Computer User Manual 1

Introduction

Overview

Congratulations on your purchase of the NiTek Duo dive computer. The NiTek Duo is a sophisticated and comprehensive dive computer that was designed to offer you the latest in dive computer technology, safety, and reliability.

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.

This information is displayed on an easy-to-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 read and

understand this manual. Make sure you fully understand how the NiTek Duo operates before diving with it.

This manual has been divided into three chapters:

• Introduction: Covers the features and functions,

specifications, and warnings for the NiTek Duo

• Using the NiTek Duo: Covers the operation of each mode

for the NiTek Duo

• Care and maintenance: Covers how to properly care for

and maintain the NiTek Duo and change the battery

2 NiTek Duo Dive Computer User Manual

Introduction

Features and functions

The NiTek Duo incorporates a number of important modes and features:

• The NiTek Duo turns on automatically upon descent

• On the surface, the NiTek Duo constantly displays a minimum of date and time

• The NiTek Duo uses easily accessible and highly reliable push buttons instead of exposed electrical contacts

• The NiTek Duo can be programmed to monitor exposure to two different gas mixtures during a dive. Mix1 is programmable for mixtures ranging from air (EAN21) to EAN50. Mix2 is programmable for mixtures ranging from air (EAN21) to EAN99. Underwater, NiTek Duo users can switch between mixes at the push of a button.

• 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

• 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 of oxygen (FO2) setting, partial pressure of oxygen (PO2), and an oxygen limit index (OLI) representing the cumulative effect of a diver’s exposure to elevated PO2s (the theoretical “CNS clock”) as a bar graph

• Through a combination of audible and visible alarms, the NiTek Duo helps to alert the diver to a number of possibly hazardous situations including: violation of ascent rate, nodecompression state, and whether mandatory decompression stops are necessary or if the diver has ascended above a mandatory stop ceiling. Nitrox specific warnings occur when the diver approaches or exceeds a limiting PO2 of 1.4

NiTek Duo Dive Computer User Manual 3

Introduction

atmospheres for mix1 and 1.6 atmospheres for mix2, and when cumulative exposure to elevated PO2s exceeds recommended limits.

• The NiTek Duo can calculate decompression stop requirements for stops as deep as 90 feet (27 meters)

• The NiTek Duo can be programmed to display data in Imperial or metric units

• Dive depth can be displayed in fresh or salt water equivalents

• 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

• 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 intervals of 15 or 30 seconds (longer intervals allow data for a greater number of dives)

• Dive data can be uploaded and stored in a dive log format on a desktop or laptop computer using the NiTekLogic™ software and optional PC interface

4 NiTek Duo Dive Computer User Manual

Introduction

Specifications

Algorithm: Buhlmann ZH-L16 Sample tissues: 9 Tissue half-lives: from 5 to 640 minutes Size and weight

Diameter: 2.5 in (62 mm) Height: 1.0 in (25 mm) Weight: 4 ounces (115 g)

Display face

Backlight illumination Low battery indicator Three user buttons Water immersion switch

Depth sensor

Sea or fresh water calibration Measuring range: 0 to 328 feet (0 to 100 m) measured every second (Gauge mode 656 feet (200 m) Accuracy: +/- 3% + 2 feet (0.5 m) Surface interval time: from 0 to 48 hrs Diving time: from 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 Average battery life: About 3 years (50 dives/year) Replacement: User replaceable or return to manufacturer

Breathing gas

Mixes: 2 gas settings 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 5

Introduction

Warnings

This information has been developed for your safety. Please read and understand this manual completely before using your NiTek Duo dive computer.

Important safety information:

• Before using your NiTek Duo, it is extremely important that you read the following points—as well as similar warning and caution notices that appear throughout this manual. Failure to do so could result in damage to or loss of equipment, serious personal injury, or death.

• The NiTek Duo is designed for use by certified divers who have maintained a sufficient level of knowledge and skill proficiency through a combination of formal training, ongoing study, and experience. It is not intended for use by persons who lack these qualifications and thus, may not be able to identify, assess, and manage the risks scuba diving entails. 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 must remember that dives requiring mandatory stage decompression carry substantially greater risk than dives made well within nodecompression limits.

• 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 should lend their NiTek Duo to anyone else until it calculates that no measurable residual nitrogen remains after previous dives and no longer displays the “desaturation time” indicator while in time mode. Further, no diver should use their NiTek Duo for repetitive dives—unless that same properly functioning NiTek Duo has accompanied them on

6 NiTek Duo Dive Computer User Manual

Introduction

all previous dives in the same repetitive dive series and is thus, accurately monitoring the diver’s total exposure to oxygen and nitrogen.

• Neither the NiTek Duo—nor any other dive computer— physically measures the amount of nitrogen present in body tissues or the rate at which nitrogen is being absorbed or released. The NiTek Duo monitors depth and time, and uses this data to work a mathematical formula designed to emulate how individuals in good general health and whose physical characteristics do not place them among those at higher risk of decompression illness (DCI) are assumed to absorb and release nitrogen from body tissues. Thus, the NiTek Duo cannot compensate for factors such as age, obesity, dehydration, cold, or exertion, which experts believe place divers at greater risk of DCI. If these, or similar 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 you will not suffer decompression illness. Even though you use these items correctly, you may still suffer 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.

When diving…

• Do not “push” the no-decompression limits (NDLs). Make safety stops before ascending. If you exceed the nodecompression limits, check your breathing gas supply at all stop depths.

• The NiTek Duo does not monitor breathing gas supply. You must monitor this yourself, on every dive, using a submersible pressure gauge or equivalent device.

NiTek Duo Dive Computer User Manual 7

Introduction

• Do not rely solely on this or any other dive computer. 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.

8 NiTek Duo Dive Computer User Manual

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 • 12

Setting the time and date • 12 Entering time display mode from another mode • 13 Activating the back light • 13

Dive option set and display mode • 14

Using computer mode • 14 Setting 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 underwater screen • 27

Changing gas mixes underwater • 28

Safety stop indication • 28

Warnings while in diving mode • 29 Gauge mode • 34 Log mode • 36 Profile mode • 38 PC transfer mode • 40

Before transferring the dive log • 40 Surface mode (upon surfacing from a dive) • 41 Altitude operation • 43

NiTek Duo Dive Computer User Manual 9

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.

Before a dive

• Check that the proper time and date are set. If you traveled, your NiTek Duo may be set to your home time zone.

• Check that the proper mixes are set for mix1 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 required decompression displayed and perform the necessary safety stop

After a dive

• Monitor surface interval time if making another dive

• Follow the no-fly requirements

• Review your dive using the log mode and profile mode

• Download the dive log to your PC if you have the optional PC interface

10 NiTek Duo Dive Computer User Manual

Using the NiTek Duo

Select

Set

Mode

Accessing display modes and screens

There are some display modes that the NiTek Duo enters and/or exits automatically. For example, by taking the NiTek Duo underwater, the dive mode automatically turns on. Upon surfacing, the NiTek Duo automatically enters the time mode.

Accessing other modes or screens requires the use of the NiTek Duo’s buttons.

Button operation

The NiTek Duo has three buttons (select, mode, 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 through the different modes, such as time mode

• Set button: This button is used to set an option’s setting, such as setting the date

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 11

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.

3 2

In time display mode, “time” (1) is displayed at the bottom of the screen, and the date (2) and time (3) with seconds (4) are displayed. Time can also be displayed in 24-hour (military) time. The NiTek 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 Mode until “set” is displayed in the “time” position. The “seconds” field flashes.

2. Press Set to “00” the seconds or press Select to go to another field, such as minutes.

3. Using Select and Set, set the year, month, day, hour, minutes, seconds, and whether you want the time displayed in 24-hour format.

12 NiTek Duo Dive Computer User Manual

Using the NiTek Duo

For example, 1:00 PM would be 13:00.

4. Press Mode. The computer returns to the time display mode.

Entering time display mode from another mode

When you are using other modes, it 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 again to reactivate the back light.

NiTek Duo Dive Computer User Manual 13

Using the NiTek Duo

154

968

Dive option set and display mode

Dive option set and display mode is where all “dive” option settings are displayed and set up. There are two screens needed to view and set up all dive options.

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. The operating depth limit when in computer mode is 328 feet (100 meters).

12 10

Dive option display and set fields for screen one

Dive option display and set fields for screen two

• (1) Dive operation

• (2) Mix1 and mix2 FO2 gas percentages

• (3) Dive safety factor

14 NiTek Duo Dive Computer User Manual

+ 40 hidden pages

Dive Rite NiTek Duo User Guide

Specifications and Main Features

Frequently Asked Questions

User Manual