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NiTek X Dive Computer User Guide

1. Dive Option Set and Display mode and Altitude Operation 1 Date This is the month and day The first digit is the month and the second digit is the day For example 1 24 represents the twenty fourth day of January 2 Time of day This is the time of day expressed in hours and minutes Time can be displayed in 24 hour military format or 12 hour format When in 12 hour format an AM or PM appears on the screen 12 NiTek X Dive Computer User Manual V1 0 Using the NiTek X Entering Surface mode from another mode When you are using other modes it 1s very easy to return to Surface mode Simply press and hold button A for two to three seconds or repeatedly press button A until O C or C C is displayed Simultaneously pressing and holding button A and button B for two to three seconds will toggle between the two modes NiTek X Dive Computer User Manual V1 0 13 Using the NiTek X Time Display and Set Mode Time Display and Set mode is used to set and view the time of day and date When you enter this mode TIME is displayed on the screen 1 Date This is the month and day The first digit is the month and the second digit is the day For example 1 24 represents the twenty fourth day of January 2 Year This is the year 3 Time of day This is the time of day expressed in hours and minutes Time can be displayed in 24 hour military format or 12 hour format When in 12 hour format an AM or PM a
2. The NiTek X assumes that you keep your ascent rate within the following limits Depth range Ascent rate O to 19 feet 0 to 5 9 meters 26 feet 8 meters per minute 20 to 58 feet 6 to 17 9 meters 39 feet 12 meters per minute 59 feet 18 meters or deeper 52 feet 16 meters per minute If you exceed these ascent rates SLOW flashes on the screen and the backlight flashes The warning displays until you slow your ascent to an acceptable rate or you reach 5 feet 1 5 meters NiTek X Dive Computer User Manual V1 0 35 Using the NiTek X DIVE T 009 39 Min NDL Ascent rate warning flashes SLOW on the screen PO2 Limit Warning The PO2 warning indicates that you have exceeded 1 4 or 1 6 atmospheres for the gas you are breathing If you exceed the PO2 setting the PO2 symbol PO2 and the backlight will flash DIVET 009 39 Min NDL PO2 limit warning flashes PO2 on the screen PGT Limit Warning The Pressure Gas in Tissue PGT limit warning indicates that you are approaching the no decompression limits When seven or more of the nine bars are displayed the PGT graph flashes If all nine bars are displayed the NiTek X will change to the decompression mode 36 NiTek X Dive Computer User Manual V1 0 Using the NiTek X l l PO2 MIX 1 O C 4 4 2 0221 HEpO PGT limit warning bars flash on the screen Oxygen Limit Index OLI Warning The NiTek X s oxygen limit index OL
3. SP flashes OR The backlight turns on and EXT flashes if an external oxygen cell has been connected Note You cannot change the SP setting when in EXT mode Press button B to switch between SP and EXT Press button A and the SP number flashes Press button B to scroll through the setpoint numbers The setpoint value changes to reflect the PO2 for the selected mix and the O2 and HE percentages change to reflect the programmed mix Note Only setpoints that have been programmed with a gas mixture are available You can quickly scroll through the setpoints with button B NiTek X Dive Computer User Manual V1 0 Using the NiTek X 4 Press button A to lock in the new setpoint and return to the primary diving mode screen Note You cannot lock in a setpoint if it causes you to exceed a PO2 of 1 6 atmospheres Warnings While in Dive Mode While in diving mode there are several warnings that you should be alert to e Default warning e Ascent rate warning e PO2 limit warning e PGT limit warning e Oxygen limit index OLI warning e Decompression warning e Decompression stop violation warning e Out of range warning Default Warning If the computer is in default mode or set to a hypoxic mix at the beginning of a dive the backlight will flash If you ascend and set the mix percentages you can restart the dive See Understanding Default Mode for more information Ascent Rate Warning
4. the PO2 adjusts to reflect the current mixture you are breathing Note Only switch gas mixes when you have reached the safe operating depth limit for the gas you are switching to DIVE T 75 2 009 39 MAX Min NDL 108 ft Gas mix number flashes on the screen To change gases underwater 1 Press button A The back light turns on and the mix number flashes 2 Press button B to select a mix number The O2 and HE percentages change to the programmed mix and the PO2 indicator changes to reflect the PO2 for the selected mix Note Only the mix numbers that have been programmed with a gas mixture are available 3 Press button A to lock in the mixture and return to the primary diving mode screen Note You cannot lock in a mix if it causes you to exceed a PO2 of 1 4 or 1 6 atmospheres depending on what was programmed Changing Setpoints Underwater Because the NiTek X has the ability to be used with a closed circuit rebreather you can switch between different PO2 NiTek X Dive Computer User Manual V1 0 33 Using the NiTek X setpoints while underwater When you change setpoints the computer displays the current mixture you are breathing Note Only switch setpoints when you have reached a safe operating depth for the PO2 you are switching to C C mode with EXT cell PO2 display To change setpoints underwater l 34 Press and hold button A for 2 3 seconds The backlight turns on and the setpoint
5. If it is cold allow the computer to warm to room temperature Do not take it underwater immediately after doing so Do not transport your NiTek X on an aircraft or take it to altitude while it is sealed in an air tight container or in a damp environment Doing so may interfere with its ability to correctly read display and track depth information The NiTek X 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 LCD life Cold weather can dim the LCD display Be aware that weather related changes in air pressure can cause incorrect display of altitude settings Be sure to check indicated altitude settings against actual altitude before use Your NiTek X is not to be disassembled by anyone other than Dive Rite Unauthorized disassembly will violate the watranty If the NiTek X does not appear to be functioning properly do not use it to dive Return it to your authorized Dive Rite dealer for repair NiTek X Dive Computer User Manual V1 0 Care and maintenance e The NiTek X should not come in contact with solvents or any type of chemical substances e Do not use compressed air to dry the NiTek X e Do not use the NiTek X in hyperbaric chambers if the device is not fully submerged in water e Always rinse the computer with freshwater after use e Store the NiTek X in a cool dry lo
6. ascent time between decompression stops 5 PGT bar graph This is how much nitrogen and helium the computer assumes your body has absorbed 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 and have entered decompression 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 DECO symbol and backlight will flash These items continue 38 NiTek X Dive Computer User Manual V1 0 Using the NiTek X blinking as long as you remain shallower than the indicated stop depth Caution If you do not correct an indicated deco stop violation the warnings continue for several minutes after surfacing At this point the computer will display a Decompression Violation warning with a countdown timer beginning at 24 hours Note Removing the battery will stop the timer which will resume the count down time when the battery is reinserted 01 24 12 39 DECO VIOLATED 19 hr FRESH I l l Poz MIX J O C 4 4 2 0224 HEOO DECO VIOLATION 19 hr displayed the screen Out Of Range Warning The following can cause the out of range warning e Descend below the computer s maximum operating depths for computer m
7. NiTek X Dive Computer User Manual V1 0 47 Using the NiTek X PC Transfer Mode You can transfer the stored dive log information to your personal computer using the optional NiTek X WorkBench software and a USB interface USB communicating To enter PC transfer mode 1 Remove the knurled cap at upper left of the NiTek X and attach an appropriate external cable to the connector 2 Connect the other end of the cable to an internet compatible PC or Mac computer with NiTek X Workbench and start the NiTek X Workbench program on the computer 3 Repeatedly press button A on the NiTek X until PC is displayed 4 Press button B to enter the PC transfer mode screen USB communicating is displayed on the screen Transfer the dive log data to your PC 6 When finished press and hold button A for 2 to 3 seconds to return to surface mode 6 You may now access your NiTek X dive computer to download your dives and make change to settings such as date time gas mixes conservatism alarms etc 48 NiTek X Dive Computer User Manual V1 0 Using the NiTek X Surface Mode upon surfacing from a dive Once you surface from a dive the NiTek X automatically switches to surface mode In addition to the normal information displayed in surface mode such as time of day there is other information that is displayed that pertains to the dive you just completed This includes e Desaturation time e Surface interval
8. four 13 Contrast This allows you to set the contrast ratio between the text and background screen 14 Backlight Timeout This allows you to change the length of time the backlight is lit when activated 18 NiTek X Dive Computer User Manual V1 0 Using the NiTek X To enter Dive Set mode 1 Press button A until SET is displayed 2 Press button B to enter the dive set up option screen 3 Using the topics that follow set up your desired dive option settings Setting PO2 Setpoints Closed Circuit only Note Be sure you have properly selected C C mode before setting the PO2 setpoints you plan on using on your dive Different setpoints can be chosen to allow for use with different gas mixtures on any particular dive You can also set the NiTek X to monitor an external oxygen cell in the rebreather Not all of the setpoints have to be selected for each mix only the mixes that you plan on using Note If you only plan on using one PO2 setpoint and mixture on your dive you only need to set that PO2 and mix To set PO2 setpoints 1 If not already in closed circuit C C mode put the NiTek X in C C mode by simultaneously pressing and holding buttons A and B for 2 3 seconds 2 Press and hold button A for 3 4 seconds until SP is flashing Note If an external rebreather oxygen cell has been connected and calibrated EXT can be displayed instead of SP Press button B to toggle between EXT
9. time e Pressure Gas in Tissue PGT bar graph e Oxygen limit index OLI bar graph This information is displayed the screen until the NiTek X 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 01 24 99 39 DESAT SURF 16 27 08 26 FRESH I CC lt l AL OIC PO2 MIX Yo I 1 4 2 0221 HEOO 1 Surface interval time This is the amount of time you have spent on the surface since your last dive if there is residual nitrogen present from a previous dive It can display up to 24 hours of surface interval time 2 Desaturation time This is the amount of time expressed in hours and minutes that must pass before the residual nitrogen levels drop to a point where subsequent dives are treated as a single non repetitive dives This is not the same as time to fly NiTek X Dive Computer User Manual V1 0 49 Using the NiTek X 3 O2 OLI bar graph This indicates CNS toxicity level at the end of the dive This drops as your surface interval time increases 4 PGT exposure bar graph This is the amount of residual nitrogen and helium in your body at the end of the dive This drops as your surface interval time increases WARNING It is recommended that you wait at least
10. to Dive Rite A Return Authorization must be obtained by calling Dive Rite corporate offices 886 752 1087 to send items to Dive Rite No warranty service will be performed for other than registered owners Note Local dealers and distributors are not responsible for service of items purchased from unauthorized dealers internet dealers or dealers from other territories Before shipping ensure that the NiTek X is adequately packaged and protected Dive Rite is not responsible for any damage that may occur during shipping This warranty becomes void if NiTek X 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 express 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 X Dive Computer User Manual V1 0 Table of Contents Chapter 1 Chapter 2 Chapter 3 Indexe59 Introductione1 Overviews2 Features and Functionse3 Specificationse5 Warnings 6 Using the NiTek X 9 Getting Startede10 Accessing display modes an
11. uncalibrated Oxygen analysis mode screen 2 3 CAL O2 gt This shows that the oxygen cell has been connected and is ready to be calibrated NiTek X Dive Computer User Manual V1 0 45 Using the NiTek X calibrating Oxygen analysis mode screen 3 4 mV reading This shows that the oxygen cell has been connected and is displaying its output Oxygen analysis mode screen 4 5 and 6 mV reading and O2 percentage This shows that the oxygen cell has been calibrated and is displaying its output To enter the OXY mode 1 Remove knurled cap at upper left of NiTek X and attach an appropriate external cable and oxygen cell to the connector 2 Repeatedly press button A until OXY is displayed 3 Press button B to enter the OXY analysis mode screen OmV Uncalibrated is displayed on the screen 4 Press button A CAL O2 is displayed on the screen 46 NiTek X Dive Computer User Manual V1 0 Using the NiTek X 5 Press button B to enter calibrate mode of oxygen cell using a source of 100 oxygen for reference xx mV calibrated where xx is the mV reading of your oxygen cell and the oxygen percentage is displayed on the screen 6 To return to surface mode press and hold button A for 2 to 3 seconds 7 Set the NiTek X to C C closed circuit mode It will display EXT instead of SP setpoint indicating that it is reading the PO2 level of the external oxygen cell
12. 24 hours 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 50 NiTek X Dive Computer User Manual V1 0 Using the NiTek X Altitude Operation The NiTek X adjusts automatically for diving at altitudes of up to 19 685 feet 6 000 meters The NiTek X monitors altitude information in all modes except PC transfer mode Upon arriving at altitude the NiTek X s PGT 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 nitrogen saturated in body tissues than would be present had you spent the preceding 24 hours at the higher altitude By displaying residual nitrogen and a surface interval your NiTek X is merely reflecting this fact Prior to using the NiTek X at altitudes substantially above sea level you should find out what the actual altitude of your dive site 1S If the level of residual nitrogen calculated by the NiTek X is unusually high seven or eight bars when going to altitude the computer will be unable to enter dive mode Avoid taking the computer
13. A to advance to the next option Dive Time Alarm To exit press and hold button A for 2 to 3 seconds to return to surface mode Setting the Dive Time Alarm The NiTek X has a dive time alarm that is activated when the diver reaches the maximum time that is set for the dive When the dive time is reached the screen backlight dive time and maximum dive time alarm indicators will continue to flash until after you surface The dive time alarm can be used when you NiTek X Dive Computer User Manual V1 0 21 Using the NiTek X want to set a maximum dive time for your dive The alarm indicates when this time has expired The alarm can be turned on or off and can be set from 0 to 690 minutes To set the Maximum Dive Time alarm 1 Press button A until SET is displayed 2 Press button B to enter the dive set up option screen Mix is flashing 3 Repeatedly press button A until the screen changes and maximum dive time upper right of screen is flashing 4 Press button B to set the time when you want the alarm to sound 5 Press button A The Maximum Dive Time Alarm on off center right of screen flashes 6 Press button B to toggle the alarm on or off When finished press button A to advance to the next option Conservatism Gradient Factor To exit press and hold button A for 2 to 3 seconds to return to surface mode Setting for Conservatism or Gradient Factor The NiTek X allows you to add an additional safety
14. I 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 When seven of the O2 s nine bars are displayed the OLI graph flashes If you do not ascend to a shallower depth and all nine of the O2 s bars are displayed OLT continues to flash until the O2 bar graph drops to seven bars PO2 MIX I WC 1 4 2 0221 HEOO OLI limit warning bars flash on the screen Decompression Mode If you exceed the no decompression limits the computer enters decompression mode This indicates that you will have to limit your ascent time and enter a series of one or more decompression stops NiTek X Dive Computer User Manual V1 0 37 Using the NiTek X Caution Decompression diving is considered to substantially increase your risk of decompression illness I TOTAL DECO FRESH l PO2 MIX I O C 1 4 2 0221 HEOO Decompression warning with DECO displayed on the screen 1 Deco stop symbol The DECO symbol displays indicating that you have to stop at the depth displayed 2 Required stop depth This is the required decompression stop depth 3 Required stop time This is the time you must remain at the indicated stop depth 4 Total ascent time This is the total amount of time in minutes you must spend at the decompression stops and the
15. NiTek X Dive Computer User Guide Dre Rite www DiveRite com Date of Purchase Content DEVELOPED BY COPYRIGHT NOTICE WARRANTY INFORMATION Dive Rite 175 NW Washington Street Lake City FL 32055 Phone 386 752 1087 Fax 386 755 0613 Web www DiveRite com Copyright 2009 Lamartek Inc dba Dive Rite This manual is copyrighted by Lamartek Inc dba Dive Rite 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 X components proved to be damaged by faulty manufacture or material at no cost for a period of up to one year 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 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
16. and SP 2 Press button A to enter the setpoint selection mode The setpoint PO2 value is flashing 3 Press button B to change the PO2 to the desired value that you want to set or change 4 Press button A to select the mix setting Press button B to set the mix number NiTek X Dive Computer User Manual V1 0 19 Using the NiTek X 6 When finished press button A to return to the surface mode Setting Mix1 Through Mix7 Gas Percentages Note Be sure you have properly selected O C or C C mode before setting the breathing mix es you plan on using on your dive There are up to seven different mixes that can be used for any particular dive Not all of the mixes have to be set only the mixes that you plan on using Each mix can have an oxygen FO2 and helium FHe setting e FO2 percentages can be set for 8 to 99 percent oxygen e FHe percentages can be set for 0 to 92 percent helium Note If you only plan on using one mix on your dive you only need to set mix1 To set gas mix percentages 1 Press button A until SET is displayed 2 Press button B to enter the dive set up option screen Mix is flashing 3 Press button B to change the mix number to the desired mix number that you want to set or change 4 Press button A to select the PO2 setting Press button B to set the maximum PO2 value 1 4 or 1 6 for the selected mix number 6 Press button A to select the O2 gas percentage 7 Press butt
17. ange 0 to 492 feet 0 to 149 m measured every second Accuracy 3 2 feet 0 5 m Surface interval time from 0 to 48 hrs Diving time from 0 to 699 minutes Ascent rate warning 26 to 59 feet per minute 8 to 18 m Clock Accuracy 30 sec on average per month 24 hour display Thermometer Measuring range 40 F to 176 F 40 C to 85 C Accuracy 4 F 2 C Measurement interval Every second during dive mode Altitude Altitude function monitoring from 0 to 19 685 feet 6 000 m Battery Li MnO2 CR 123A 3V battery Average battery life About 3 years 50 dives year Replacement User replaceable Breathing gas Mixes 7 gas settings O2 setting range 8 to 99 percent O2 setting 1 increments He setting range 0 to 92 percent He setting 1 increments Dive log Dive logging Minimum of 15 hours depends on settings Profile sampling rates 15 or 30 seconds NiTek X Dive Computer User Manual V1 0 5 Introduction Warnings This information has been developed for your safety Please read and understand this manual completely before using your NiTek X dive computer Important safety information Before using your NiTek X 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 X is designed for use by certified div
18. cation After diving wipe the computer dry and store it in a location separate from other damp items NiTek X Dive Computer User Manual V1 0 55 Care and maintenance Low Battery Warning The battery that comes with the NiTek X is designed to last for up to three years under normal use You may get more or less use from the battery depending on how often it is used and how it is cared for Note The battery symbol will begin to empty when the battery starts to run low and will be completely empty when the battery 1s critically low SESS lle 12 39 FRESH P0O2 MIX O C 1 4 2 02214 HEOO Cautions e All NiTek X functions may cease within two to three days of the low battery symbol first appearing Always have low a battery replaced promptly e A depleted battery that is left in a NiTek X for a long period of time may leak Replace battery 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 gas mixes time and date etc is lost Be sure to re enter the data after replacing the battery Before replacing the battery you should have a clean working area free of dirt dust and moisture and you need the following items 56 NiTek X Dive Computer User Manual V1 0 Care and maintenanc
19. d HE percentages This is the oxygen and helium percentages programmed for the gas mix number that is selected 9 PGT bar graph This is how much nitrogen and helium the computer assumes your body has absorbed There are a maximum of nine bars When all nine bars are displayed it NiTek X Dive Computer User Manual V1 0 31 Using the NiTek X means that you are at or have exceeded the no decompression limits Second Underwater Screen While underwater you can change to the second diving mode screen that displays additional information When you switch screens the current depth conservatism Gradient Factor time of day and temperature is displayed 75 2 r MAX 108 r i FRESH l PO MIX iJ l O C 4 4 2 0224 E00 Second underwater screen 1 Time of day This is the current time of day 2 Maximum Depth This is the maximum depth that has been reached on this dive 3 Temperature This is the current temperature To display the second diving mode screen 1 Press and hold button B The back light turns on and the second screen is displayed 2 Release button B to return to the primary diving mode screen Changing Gas Mixes Underwater Because the NiTek X has the ability to use seven different gas mixes during a dive you need the ability to switch between these 32 NiTek X Dive Computer User Manual V1 0 Using the NiTek X mix settings while underwater When you switch mix settings
20. d screense1 1 Surface Modese12 Time Display and Set Modee14 Dive Option Set and Display Modee16 Plan Mode 28 Dive Computer Mode 30 Log Modes41 Profile Modee43 OXY Modes45 PC Transfer Mode 48 Surface Mode upon surfacing from a dive 49 Altitude Operatione51 Care and maintenance 53 Proper Handling Techniques 54 Low Battery Warning 56 NiTek X Dive Computer User Manual V1 0 Chapter 1 Introduction Summary This chapter provides an overview of the NiTek X lists the NiTek X s features and functions and covers warning information that should be read before using your NiTek X Content Overview 2 Features and Functions 3 Specifications 5 Warnings 6 When diving 7 1 NiTek X Dive Computer User Manual V1 0 Introduction Overview Congratulations on your purchase of the NiTek X dive computer The NiTek X is a sophisticated and comprehensive dive computer that was designed to offer you the latest in dive computer technology safety and reliability The NiTek X dive computer is a multifunctional computer for recreational diving providing information on depth dive times no decompression and decompression times and nitrogen and helium 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
21. e CR123A Lithium battery Silicone grease Lint free cloth Cotton swabs Pencil with a good eraser tip To replace the battery l Locate the battery compartment It is inside the small knurled cap on the upper right side of the computer Remove the knurled cap Be sure to hold the computer with its right side facing down to minimize any water droplets from getting into the battery compartment Examine the battery and battery compartment for signs of corrosion Wipe off any sand or dirt from the cover and o ring using a cotton swab Remove the old battery Clean the new battery contacts with the pencil eraser Remove the o ring from the cap Be careful not to damage the o ring Clean the o ring and place a thin layer of silicone grease on the o ring Install the o ring in the cap Install the new battery making sure that the polarity is correct positive end faces inward 10 Screw the battery cap back into place Do not over tighten 11 Reset the time and date NiTek X Dive Computer User Manual V1 0 57 Care and maintenance 58 NiTek X Dive Computer User Manual V1 0 A A mode button 11 accessing modes and screens 11 alarms 3 Dive Time Alarm 22 Maximum Depth Alarm 21 algorithm 5 altitude 3 5 altitude operation 51 ascent rate warning 35 ascent time 39 B B set button 11 Backlight 4 26 Backlight Timeout 19 26 battery 5 low battery warning 56 replaci
22. ers 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 X in conjunction with Enriched Air Nitrox EANx or Trimix requires that divers be trained and certified for Nitrox or Trimix diving The NiTek X 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 X 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 no decompression limits The NiTek X is designed for use by one diver at a time Divers should not share a single NiTek X or any other dive computer on the same dive Additionally no diver should lend their NiTek X 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 X for repetitive dives unless that same properly functioning NiTek X has accompanied them on all previous NiTek X Dive Computer User Manual V1 0 Introduction div
23. es the log entry number assigned to an earlier dive to change 2 Max depth This is the maximum depth reached during the dive 3 Date This the month and day of the dive 4 Dive time This is the actual bottom time for the dive 5 FO2 and FHE gas percentages These are the FO2 and FHE gas percentages that you entered for the dive All calculations were based on these percentages To view a dive log 1 Press button A until LOG is displayed 2 Press button B to enter the log mode screen 3 Press button B to change to the log page for the most recent dive NiTek X Dive Computer User Manual V1 0 41 Using the NiTek X _OR Repeatedly button B to scroll down through the logged dives To fast scroll press and hold button B 4 When finished press and hold button A for 2 to 3 seconds to return to surface mode 42 NiTek X Dive Computer User Manual V1 0 Using the NiTek X Profile Mode Profile mode enables you to see a record of the depths you reached at various points during a dive You can display a detailed profile of each dive stored in the log When a dive is selected the computer automatically displays the depth and the time in the dive when you reached that depth until it reaches the end of the dive Dive profile information is either stored in 15 or 30 second intervals during a dive This must be set in dive mode before a dive Refer to Setting the dive profile sampling rate for more
24. es at the push of a button The NiTek X is capable of functioning up to a depth of 492 feet 149 meters The NiTek X automatically adjusts for altitudes up to 19 685 feet 6 000 meters The NiTek X displays a variety of data underwater including date time of day temperature current and maximum depths no decompression dive time elapsed and remaining time The NiTek X displays data specifically related to the use of Enriched Air Nitrox EANX and helium including fraction of oxygen FO2 setting fraction of helium FHe 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 visible alarms the NiTek X helps to alert the diver to a number of possibly hazardous situations including violation of ascent rate no decompression 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 user preset limiting PO2 1 4 or 1 6 or when NiTek X Dive Computer User Manual V1 0 3 Introduction cumulative exposure to elevated PO2s exceeds recommended limits e The NitekX can be used with closed circuit rebreathers and includes constant PO2 setpoint capabilities 0 4 to 1 6 and is upgradable for 4 cell monitoring e External oxygen sensor mon
25. es in the same repetitive dive series and is thus accurately monitoring the diver s total exposure to oxygen helium and nitrogen Neither the NiTek X 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 X 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 and or helium from body tissues Thus the NiTek X 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 X and other dive computers or dive tables with even greater caution Experts still know surprisingly little 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 X 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 X conservatively and in conjunction with other dive planning devices such as di
26. file data stored with the new information To set the dive profile sampling rate 1 Press button A until SET is displayed 2 Press button B to enter the Dive Set Up option screen Mix is flashing 3 Repeatedly press button A until the screen changes and the Dive Profile Sampling Rate is flashing 4 Press button B to toggle between 15 and 30 seconds When finished press button A to advance to the next option Salt or Fresh Water Use To exit press and hold button A for 2 to 3 seconds to return to surface mode Setting for Fresh or Salt Water Use The NiTek X is capable of operating using fresh or salt water calculations This is based on e One atmosphere of saltwater is 33 feet 10 meters e One atmosphere of freshwater is 34 feet 10 3 meters 24 NiTek X Dive Computer User Manual V1 0 Using the NiTek X Before going diving set the computer to the type of water you are diving in This allows for the most accurate calculations with respect to no decompression limits etc To set for fresh or salt water use 1 Press button A until SET is displayed 2 Press button B to enter the dive set up option screen Mix is flashing 3 Repeatedly press button A until the screen changes and SEA or FRESH is flashing 4 Press button B to toggle between fresh or sea water 5 When finished press button A to advance to the next option Contrast To exit press and hold button A for 2 to 3 seconds to return t
27. g 40 oxygen limit index 37 PGT limit warning 37 PO2 limit warning 36 water fresh or salt 4 salt or fresh water use 25 Y year 14 NiTek X Dive Computer User Manual V1 0 61 www DiveRite com NiTek X Dive Computer User Manual V1 0
28. iTek X is operating in its normal mode OC or C C is displayed on the screen and all computer mode functions are operational Using these settings is described in the Dive Computer mode section The Dive Option Set and Display mode SET is used to review and change option settings that pertain to an upcoming dive The operating depth limit when in dive operation is 492 feet 149 meters Note The NiTek X can be set to operate in the Open Circuit O C or Closed Circuit C C mode depending on dive options set When the computer is in Dive Option Set and Display mode SET is displayed on the screen There are four screens that are used to set up all of the computer mode options PO2 MIX oa 4 4 2 0221 HEOO Kii Dive Option Display and Set fields for screen one 1 Mix number This is the mix number you are setting 2 PO2 or SP setting This is the PO2 setting for the mix number selected in O C mode or setpoint SP setting in C C mode The PO2 can be set for 1 4 or 1 6 in O C mode and the SP for 0 4 to 1 6 in CC mode 16 NiTek X Dive Computer User Manual V1 0 Using the NiTek X 3 FO2 gas percentage This is the oxygen percentage for the mix number selected The O2 percentage setting range is 8 to 99 percent 4 FHe gas percentage This is the helium percentage for the mix number selected The He percentage setting range is O to 92 percent 5 Maximum operating depth MOD for FO2 sett
29. 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 LOG 1 MAX 122 ft 1 Dive log number This is the dive number that corresponds to the dive number when in log mode 2 Max depth This is the maximum depth reached during the dive 3 Dive time This is the actual bottom time for the dive To view a dive profile 1 Repeatedly press button A until PROF is displayed 2 Press button B to enter the profile mode screen 3 Press button B to change to the profile page for the most recent dive NiTek X Dive Computer User Manual V1 0 43 Using the NiTek X _OR Repeatedly button B to scroll down through the profiled dives To fast scroll press and hold button B 4 When finished press and hold button A for 2 to 3 seconds to return to surface mode 44 NiTek X Dive Computer User Manual V1 0 Using the NiTek X OXY Mode Using an external cable and oxygen sensor cell you can use your NiTek X with a closed circuit rebreather to monitor the constant PO2 setpoint and decompression information Oxygen analysis mode screen 1 1 mV reading This is the initial part of the sequence for calibration of an oxygen cell This shows that the oxygen cell has not been connected yet 2 uncalibrated This shows that the oxygen cell has not been connected or calibrated to a standard gas mixture
30. ing This is the safe operating depth maximum for the mix selected This is based on a limiting PO2 factor of either 1 4 or 1 6 atmospheres DIVE T min 30 Dive Option Display and Set fields for screen two 6 and 7 Max depth alarm This is an alarm that can be set to flash the maximum depth and screen backlight when a maximum depth is reached When the alarm is turned on the maximum depth alarm symbol is displayed 8 and 9 Maximum time alarm This is an alarm that can be set to flash the maximum time and screen backlight when a maximum dive time is reached When the alarm is turned on the clock alarm symbol is displayed NiTek X Dive Computer User Manual V1 0 17 Using the NiTek X Dive Option Display and Set fields for screen three 10 Conservatism or Gradient Factor This allows you to select between the 3 standard Gradient Factors 75 95 40 100 or 30 75 or input a custom Gradient Factor For more information on Gradient Factors and which settings may be better for you refer to related sections of this User Guide and to sources such as the Jurgensen Marine Hammerhead Electronics User Manual 11 Salt or Fresh water This is the setting for salt water or fresh water use 12 Dive Profile Sampling This is how frequently every 15 or 30 seconds depth data is measured and stored during a dive os Contrast 4 Backlight timeout 16 Dive Option Display and Set fields for screen
31. itoring and analysis capabilites can be added e The NiTek X can be programmed to display data in Imperial or metric units e Dive depth can be displayed in fresh or salt water equivalents e Preset and custom Conservatism or Gradient Factors can be programmed to increase dive safety margins e Special mode indicators makes it easy to determine what display mode or screen you are in at any time e The NiTek X has a selectable backlight to illuminate the screen in all light conditions e The NiTek X s memory capability enables it to hold and display log data for a minimum of 15 hours of dive time depending on settings e Detailed dive profile information can be stored for each dive through user programmable sample intervals of 15 or 30 seconds the longer intervals allow data for a greater number of dives e Dive data can be uploaded and stored in a dive log format on a desktop or laptop computer using the Diverite NiTek Workbench software and optional PC interface 4 NiTek X Dive Computer User Manual V1 0 Introduction Specifications Algorithm Buhlmann ZH L16 Sample tissues 16 Tissue half lives from 5 to 640 minutes Size and weight Length 3 9 inches 9 9cm wide Height 3 7 inches 9 39cm high Thick 0 78 inches 1 98cm deep Weight 12 ounces 340 gms Display face Backlight illumination Low battery indicator Two user buttons Auto pressure switch Depth sensor Sea and fresh water calibration Measuring r
32. margin to the no decompression limits and decompression stop times There are three preset values plus a user changeable setting The three preset values correspond to Gradient Factor ratios 75 95 40 100 and 30 75 0 1 or 2 respectively while the user changeable setting is to allow a custom factor Before going diving set the computer to your preferred Conservatism Gradient Factor A higher setting results in shorter no decompression times and longer decompression stop times 22 NiTek X Dive Computer User Manual V1 0 Using the NiTek X To set a preset Conservatism Gradient Factor Press button A until SET is displayed Press button B to enter the dive set up option screen Mix is flashing Repeatedly press button A until the screen changes and CONSO CONS1 CONS2 or CONS GF flashes Press button B to toggle through the selections If you wish to use CONS GEF press button B when CONS GF flashes You can then input your own Gradient Factor by using button B to move through the values and button A to select When finished press button A to advance to the next option Metric or Imperial To exit press and and hold button A for 2 to 3 seconds to return to surface mode Setting the Computer for Metric or Imperial operation The NiTek X can calculate and give you values in Imperial units or Metric units When in Imperial depth values are expressed in feet When in Metric depth values are expressed in meters T
33. n down depending on what you are trying to do The correct procedure to use is Clearly defined in each topic throughout the manual e A mode button This button is used to select and scroll through the different modes such as time mode and locks in setting values when setting options e B set button This button is used to set an option such as setting the date ii i S04 4G zigd NIT The front of the NiTek X showing the two buttons that are used to access and setup the different modes and options NiTek X Dive Computer User Manual V1 0 11 Using the NiTek X Surface Mode Surface mode is the NiTek X s default screen mode with either O C or C C displayed on the screen depending on settings The computer returns to this mode automatically upon surfacing from a dive and from other modes when two to three minutes of inactivity have passed After several minutes of inactivity the NiTek X will go into its sleep mode to conserve battery usage To wake from sleep mode momentarily press either button Note O C or C C refers to either Open Circuit or Closed Circuit and can be switched by simultaneously holding buttons A and B for two to three seconds The NiTek X may display additional information concerning time date mixture settings alarm settings exposure to nitrogen and oxygen desaturation time and surface interval time These items are covered in Surface mode Upon Surfacing From a Dive
34. n the gas mix that is set for mix1 If you are making a dive within 24 hours of a previous dive the no decompression time limits are based on the residual nitrogen remaining The two most important values that are displayed on the screen in plan mode are the depth and no decompression time limit MIX Jo PLAN 1 0221 HEOO 1 Depth When you first enter Plan mode the initial depth displayed is 30 feet 9 meters You can advance the depth in 10 foot 3 meter increments Fifteen different dive plan depth increments can be displayed to a maximum depth of 170 feet 51 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 default mode a series of horizontal lines appears If the NiTek X 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 If this takes place a series of horizontal dashes are displayed Similarly for combinations of depth and FO2 that would cause a diver to exceed a limiting PO2 of 1 6 atmospheres a series of horizontal dashes appear in place of the no decompression limit 28 NiTek X Dive Computer User Manual V1 0 Using the NiTek X To enter Plan mode 1 Repeatedly press bu
35. ng 56 Buhlmann 5 button operation 11 C care and maintenance 53 proper handling techniques 54 clock 5 Computer mode 30 options 16 Index conservatism or gradient factor 18 23 Contrast 19 26 D date 12 14 log mode 41 date and time 3 deco symbol 38 decompression mode 38 decompression stop violation warning 39 default mode 27 surface mode 12 default warning 35 depth 3 28 30 maximum 30 stop depth 39 depth sensor 5 desaturation time 49 dive log 4 5 Dive Option Set and Display mode 16 dive profile 4 dive time 31 log mode 41 profile mode 43 diving after a dive 10 before a dive 10 during a dive 10 diving mode 30 primary screen 30 second screen 32 NiTek X Dive Computer User Manual V1 0 Care and maintenance F features and functions 3 FHe 17 FO2 17 FO2 and FHe percentages log mode 41 fresh or salt water use 25 fresh water 18 G gas mixes 20 changing underwater 33 gas mixtures 3 Gradient Factor or Conservatism 23 I Imperial 4 L log 4 log mode 41 viewing 41 M maximum depth log mode 41 profile mode 43 Maximum Depth Alarm 17 21 Maximum Time Alarm 17 22 metric 4 Metric or Imperial 24 mix changing underwater 33 mix number 16 mixes 5 20 N NDL 28 31 no decompression limit 28 31 O OLI 31 50 options Computer mode 16 out of range wa
36. o set for Metric or Imperial operation 1 2 Press button A until SET is displayed Press button B to enter the dive set up option screen Mix is flashing Repeatedly press button A until the screen changes and ft or m is flashing Press button B to toggle between ft feet and m meter When finished press button A to advance to the next option Dive Profile To exit press and hold button A for 2 to 3 seconds to return to surface mode NiTek X Dive Computer User Manual V1 0 23 Using the NiTek X Setting the Dive Profile Sampling Rate The NiTek X allows you to choose how frequently it samples and stores depth time etc data The data it samples and stores is used in profile mode or when the data is uploaded to a personal computer There are two sampling rates to choose from 15 second and 30 second The 30 second sampling rate 1s the computer s default setting The 15 second sampling rate enables the computer to sample and store 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 data every 30 seconds during a dive The 30 second rate provides a less detailed dive profile but it is capable of storing more information for more dives Note When the computer s memory storage 1s full it overwrites the oldest dive pro
37. o surface mode Setting for Screen Contrast The NiTek X is capable of changing the degree of image contrast between the screen characters and the background to aid in visibility in poor lighting situations Before going diving set the computer to give a contrast ratio that allows for easiest readability conditions The default ratio is 5 and ranges from 0 to 10 To set for Screen Contrast use 1 Press button A until SET is displayed 2 Press button B to enter the dive set up option screen Mix is flashing 3 Repeatedly press button A until the screen changes and the contrast number is flashing 4 Press button B to increasne the contrast ratio 5 When finished press button A to advance to the next option Backlight To exit press and hold button A for 2 to 3 seconds to return to surface mode NiTek X Dive Computer User Manual V1 0 25 Using the NiTek X Setting for Backlighting The NiTek X is capable of changing the length of time the screen backlight is lit to aid in visibility in poor lighting situations The timeout ranges from 2 20 seconds in 2 second intervals or never always on Note The never setting will quickly drain the battery and should be used very sparingly Before going diving set the computer for the time you would like the backlight to stay illuminated To set backlight timeout 1 Press button A until SET is displayed 2 Press button B to enter the Dive Se
38. ode e Exceed an actual bottom time of 699 minutes e Accrue a total ascent time of over 999 minutes An out of range warning will cause the screen backlight to flash WARNING A NiTek X displaying an out of range warning is incapable of displaying other critical information such as depth time ascent rate PO2 OLI and deco stop violations and required decompression stops For this reason you should not under any circumstance use a NiTek X in such a way that would NiTek X Dive Computer User Manual V1 0 39 Using the NiTek X cause an out of range warning Under such conditions the risk of serious personal injury or death would be substantial 40 NiTek X Dive Computer User Manual V1 0 Using the NiTek X Log Mode For each dive the NiTek X stores information such as depth time gases etc in a log This stored log information can be viewed directly from the NiTek X s screen when in log mode The logbook will hold a minimum of 15 hours depending on settings Each dive is assigned a log number and the day s date making it easy for you to toggle between the dive log pages DIVE T min 30 A 01 24 MAX 188 ft FRESH Yo fete ftattetetaes 0z 21 HEOO 1 Log entry number This is the sequence in which the log appears The most recent log entry has the lowest number beginning with log one When the computer s memory is full the oldest dives are overwritten with the new dives This caus
39. ome time zone e Check that the proper mixes and modes are set Ensure that you are in either the appropriate O C or C C mode when programming your NiTek X computer e Make sure that you review the dive plan mode for maximum depths and times for the mixes you are using During a dive e Monitor the NiTek X throughout your dive for depth and time e Monitor the Pressure Gas in Tissue PGT and Oxygen Limited Indicator OLI O2 loading bar graphs e Pay attention to any alarms such as an ascent rate warning e Follow the no decompression limits or complete the required decompression displayed After a dive e Monitor surface interval time if making another dive e Follow desaturation and no fly guidelines e Review your dive using the log mode and profile mode e Download the dive log to your PC if you have the optional PC interface 10 NiTek X Dive Computer User Manual V1 0 Using the NiTek X Accessing display modes and screens There are some display modes that the NiTek X enters and or exits automatically For example by taking the NiTek X underwater the dive mode automatically turns on Upon surfacing the NiTek X automatically enters the surface mode To access other modes or screens requires the use of the NiTek X s buttons Button operation The NiTek X has two buttons A mode and B set which are used to access the different modes and screens To use the buttons simply press the button once or hold the butto
40. on B to set the O2 percentage you are setting for the selected mix number Note Maximum operating depth will change based on the O2 percentage selected 8 Press button A to select the He gas percentage 9 Press button B to set the He percentage you are setting for the selected mix number 20 NiTek X Dive Computer User Manual V1 0 Using the NiTek X 10 When finished press button A to advance to the next option Maximum Depth Alarm To exit press and hold button A for 2 to 3 seconds to return to surface mode Setting the Maximum Depth Alarm The NiTek X has a maximum depth alarm that is activated when the diver reaches the maximum depth that is set When the max depth is reached the screen backlight current depth and maximum depth indicators will flash until you have ascended to a depth that is shallower than the maximum depth setting The alarm can be turned on or off and can be set from 0 to 500 feet 0 to 150 meters To set the Maximum Depth alarm 1 Press button A until SET is displayed 2 Press button B to enter the dive set up option screen Mix is flashing 3 Repeatedly press button A until the screen changes and maximum depth upper left of screen is flashing 4 Press button B to set the depth when you want the alarm to sound 5 Press button A The Maximum Depth Alarm on off center left of screen flashes 6 Press button B to toggle the alarm on or off When finished press button
41. ppears on the screen 4 Seconds This is the seconds for the time of day To display the time and date Time and date information is displayed when the NiTek X is the Surface mode screen 1 To enter the Surface mode screen from any other screen repeatedly press button A C C or O C will be displayed in the lower left of the screen with the time and date across the top of the screen 14 NiTek X Dive Computer User Manual V1 0 Using the NiTek X 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 iF Press and hold button B for four to five seconds while in Surface mode The seconds field flashes Press button B to 00 the seconds field or press button A to select another field such as the minutes field Using buttons A and B set the year month day hour minutes seconds and whether you want the time displayed in 24 hour format For example 1 00 PM would be 13 00 in 24 hour format When finished press button A for 2 to 3 seconds to return to surface mode NiTek X Dive Computer User Manual V1 0 15 Using the NiTek X Dive Option Set and Display Mode Dive Option Set and Display mode is where all dive option settings are displayed and set up Using Dive Option Set and Display mode Dive Option Set and Display mode is when the N
42. pression time limit dive time max depth PO2 for selected mix mix number O2 and HE percentages for gas selected and the OLI and PGT bar graphs a 009 39 sz Min NDL 16 Prima y underwater screen view 1 1 Depth This is the current depth 2 Maximum depth This is the maximum depth that has been reached during the dive 30 NiTek X Dive Computer User Manual V1 0 Using the NiTek X 3 PO2 This is the partial pressure of O2 at your current depth It is based on the FO2 settings for the mix selected 4 O2 OLD bar graph This is the oxygen limit index OLI that calculates the cumulative effect of your exposure to elevated partial pressures of oxygen PO2 There are a maximum of nine bars When all bars are displayed it means that you have used 100 percent of your CNS clock This graph increases when you descend due to higher partial pressures and may decrease when you ascend 5 Dive time This is the time spent in minutes and seconds underwater measured from the time you descended below 5 feet 1 5 meters DIVE T 009 3 Primary underwater screen view 2 6 Remaining no decompression limit NDL This is the time that is remaining in minutes before you reach the no decompression limit This NDL time limit increases when you ascend and decreases when you descend 7 Mix number This is the mix number for which the computer is currently calculating dive data 8 O2 an
43. read display the diver has no problem following and reading the displayed information The NiTek X comes standard with a number of modes including a sleep mode time mode dive set mode dive plan mode log mode profile mode PC transfer mode dive mode external oxygen cell capabilities OC mode and CC mode Note It is extremely important that you carefully read and understand this manual Make sure you fully understand how the NiTek X operates before diving with it This manual has been divided into three chapters e Introduction Covers the features and functions specifications and warnings for the NiTek X e Using the NiTek X Covers the operation of each mode for the NiTek X e Care and maintenance Covers how to properly care for and maintain the NiTek X and change the battery 2 NiTek X Dive Computer User Manual V1 0 Introduction Features and Functions The NiTek X incorporates a number of important modes and features The NiTek X turns on automatically upon descent On the surface the NiTek X displays a minimum of date and time The NiTek X uses easily accessible and highly reliable push buttons instead of exposed electrical contacts The NiTek X can be programmed to monitor exposure to seven different gas mixtures during a dive in either open circuit or closed circuit mode Gas mixtures including combinations of oxygen helium and nitrogen can be programmed Underwater NiTek X users can switch between mix
44. rning 40 OXY analysis mode 45 OXY analysis mode entering 46 Oxygen Limit Index 31 50 Oxygen Limit Index warning 37 P PC transfer mode 4 48 entering 48 percentages mixes 20 PGT bar graph 32 39 50 PGT limit warning 37 Plan mode 28 PO2 17 31 PO2 limit warning 36 PO2 setpoints 19 Pressure Gas in Tissue 37 profile 4 profile mode 43 viewing 43 60 NiTek X Dive Computer User Manual V1 0 Profile Sampling Rate 18 24 R residual nitrogen 28 32 39 50 S safety information 6 salt water 18 screen contrast 26 setpoints 17 changing underwater 34 PO2 19 setting Backlight Timeout 19 26 conservatism or gradient factor 23 dive options 16 fresh or salt water use 25 Maximum Depth Alarm 21 Maximum Time Alarm 22 Metric or Imperial 24 PO2 setpoints 19 Profile Sampling Rate 18 24 Screen Contrast 19 26 time and date 15 size and weight 5 sleep mode 12 SP 17 specifications 5 surface interval time 49 surface mode 12 49 Care and maintenance Surface mode entering from another mode 13 T temperature 32 thermometer 5 time Dive Time Alarm 22 stop time 39 time and date setting 15 Time mode 14 time of day 12 14 32 W warnings 6 ascent rate 35 decompression mode 38 decompression stop violation warning 39 default warning 35 diving mode 35 low battery warning 56 out of range warnin
45. t Up option screen Mix is flashing 3 Repeatedly press button A until the screen changes and the backlight timeout value is flashing 4 Press button B to toggle through the times When finished press button A return to the SET mode To exit press and hold button A for 2 to 3 seconds to return to surface mode Understanding Default Mode Once the computer s gas mixes are programmed the settings are stored in the computer unless the battery 1s replaced When the battery is replaced all gas mixture settings change to 21 percent oxygen 00 percent helium and 79 percent nitrogen Note The computer will retain all decompression and dive log information when the battery is replaced Note Removing the battery when the dive computer is in decompression violation mode will not clear any decompression violation information the countdown will resume at the time the battery had been removed Note You should not rely on the NiTek X as the sole means of tracking your exposure to elevated partial pressures of oxygen It 26 NiTek X Dive Computer User Manual V1 0 Using the NiTek X is recommended that you use either a second computer or another tracking method such as dive tables NiTek X Dive Computer User Manual V1 0 27 Using the NiTek X Plan Mode Plan mode enables you to determine how long you can stay at various depths while remaining within the no decompression limits The no decompression time limits are based o
46. tering surface mode from another mode 13 Time display and set mode 14 Setting the time and date 15 Dive Option Set and Display Mode 16 Using Computer Mode 16 Setting PO2 Setpoints 19 Setting Mix1 Mix7 gas percentages 20 Setting the Maximum Depth Alarm 21 Setting the Dive Time Alarm 22 Setting Conservatism Gradient Factor 23 Setting the Computer for Metric or Imperial operation 24 Setting the Dive Profile Sampling Rate 24 Setting for Fresh or Salt Water use 25 Setting Screen Contrast 26 Setting Backlighting 26 Understanding Default Mode 27 Plan Mode 28 Computer Mode 30 Primary underwater screen 30 Second underwater screen 32 Changing gas mixes underwater 33 Changing setpoints underwater 34 Warnings while in diving mode 35 Log Mode 41 Profile Mode 43 OXY Mode 45 PC Transfer Mode 48 Surface Mode upon surfacing from a dive 49 Altitude Operation 51 9 NiTek X Dive Computer User Manual V1 0 Using the NiTek X Getting Started The NiTek X has many modes including Open Circuit and Closed Circuit and screens as well as 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 e Check that the proper time and date are set If you are traveling your NiTek X may still be set to your h
47. to altitude when residual nitrogen levels are this high and do not enter the water until nitrogen levels have dropped substantially Note Do not place the NiTek X 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 X with wet dive gear which may cause it to turn on and enter dive mode This can interfere with the computer s ability to function accurately NiTek X Dive Computer User Manual V1 0 51 Using the NiTek X 52 NiTek X Dive Computer User Manual V1 0 Chapter 3 Care and maintenance Summary This chapter provides care and maintenance and battery information for the NiTek X Content Proper handling techniques 54 Low battery warning 56 Replacing the battery 56 53 NiTek X Dive Computer User Manual V1 0 Care and maintenance Proper Handling Techniques The NiTek X is constructed to withstand the most demanding diving conditions It is however a high precision instrument which requires proper care Caution Failure to follow these handling techniques may result in damage to the NiTek X 54 Do not store the computer in hot humid or wet environments The pressure transducer is sensitive to both heat and humidity If impaired it may cause incorrect altitude or depth readings When in hot and or humid environments dip the computer in water for several minutes to cool it to room temperature before using it
48. tton A until PLAN is displayed 2 Press button B to enter the Plan mode screen 3 Press button B to advance the depth The no decompression time limits change automatically based on the depth 4 When finished press and hold button A for 2 to 3 seconds to return to surface mode WARNING Do not plan dives to depths deeper than those for which the NiTek X 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 or 1 6 atmospheres This may increase your risk of decompression illness or CNS oxygen toxicity and can lead to serious personal injury or death NiTek X Dive Computer User Manual V1 0 29 Using the NiTek X Dive Computer Mode Dive Computer mode is automatically entered when the computer enters the water It begins performing its dive calculations once you descend below 5 feet 1 5 meters Caution Prior to diving always check to ensure that the O C or C C modes FO2 and FHe settings are correct and that the computer is not in default mode While in diving mode the computer calculates and displays information about your dive and prompts you with safety stop information and warnings if needed While underwater there are two screens you can toggle between and you can switch to different gas mixes when needed Primary Underwater Screen When you enter the water the primary screen shows your depth remaining no decom
49. ve tables Do not rely on the NiTek X 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 no decompression limits check your breathing gas supply at all stop depths The NiTek X does not monitor breathing gas supply You must monitor this yourself on every dive using a submersible pressure gauge or equivalent device NiTek X Dive Computer User Manual V1 0 7 Introduction Because the NiTek X can be programmed to use multiple gases it is extremely important that you have set the proper gases in the NiTek X before your dive and you understand how to switch between the different mixes during your dive 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 X makes assumptions regarding residual nitrogen and or helium based on altitude settings Avoid making abrupt changes in altitude following a dive as doing so may be very dangerous NiTek X Dive Computer User Manual V1 0 Chapter 2 Using the NiTek X Summary This chapter provides topics about using setting and understanding each of the modes and options of the NiTek X Content Getting started 10 Accessing display modes and screens 11 Button operation 11 Surface mode 12 En

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