1. Manuals
  2. Brands
  3. Tusa Manuals
  4. Diving Instrument
  5. ZEN
  6. Operator's manual

Tusa ZEN Operator's Manual

Zen watch style dive computers
Hide thumbs
Table of Contents

Advertisement

Quick Links

O wn er 's M a n u a l
T U S A Q UA L I T Y
®
D I V E C O M P U T E R

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the ZEN and is the answer not in the manual?

Questions and answers

Related Manuals for Tusa ZEN

Summary of Contents for Tusa ZEN

  • Page 1 O wn er ’s M a n u a l T U S A Q UA L I T Y ® D I V E C O M P U T E R...
  • Page 2 The special USB Interface Cable and CD described on pages 16 and 94 of the manual are components of the TUSA DataLog PC Interface system that is available as an optional accessory item that can be purchased from your authorized TUSA dealer.

  • Page 3: Warranty, Notices, Decompression Model

    The program within the ZEN simulates the absorption of nitrogen into the body by using a mathematical model. This model is merely a way to apply a limited set of data to a large range of experiences. The ZEN dive computer model is based upon the latest research and experiments in decompression theory.

  • Page 4: Table Of Contents

    CONTENTS WARRANTY, NOTICES, DECOMPRESSION MODEL ....................2 NOTICE - STORAGE AND INITIAL ACTIVATION ......................7 FULL LCD ..................................8 FEATURES AND DISPLAYS ............................9 CONTROL BUTTONS ............................... 10 OPERATING MODE STRUCTURE ........................... 11 OPERATION AS A DIVE COMPUTER ........................12 AUDIBLE ALARM ..............................
  • Page 5 CONTENTS (continued) DIVE COMPUTER SURFACE MODES .......................... 37 SURFACE MODE ..............................38 NORM SURF MAIN .............................. 40 NORM SURF ALT ..............................41 NORM/GAUGE SET MODES ............................ 41 Set FO2 for NORM Nitrox Dives .......................... 42 SET F GROUP (FO2) ..............................44 Set FO2 GAS 1 ..............................
  • Page 6 CONTENTS (continued) NORM PLAN MODE ..............................57 FLY MODE ................................. 59 DESAT MODE ................................60 NORM/GAUG LOG MODE ............................62 HISTORY MODE ................................ 65 NORM DIVE MODES ..............................67 NO DECO DIVE TIME REMAINING (NDC) ......................68 OXYGEN ACCUMULATION ............................69 ASCENT RATE INDICATOR (ASC) ..........................
  • Page 7 ALTITUDE SENSING AND ADJUSTMENT ......................119 CHARTS OF NO DECOMPRESSION LIMITS AT ALTITUDE ................120 CHART OF OXYGEN EXPOSURE LIMITS ......................121 ERROR (RESET) DURING A DIVE ......................... 122 SPECIFICATIONS ..............................123 TUSA INTERNATIONAL ............................130 INSPECTION/ SERVICE RECORD ......................... 131...

  • Page 8: Notice - Storage And Initial Activation

    NOTICE STORAGE and INITIAL ACTIVATION ZEN watch style dive computers are placed in a Deep Sleep mode prior to being shipped from the factory. The intent is to extend storage life of the Battery for up to 7 years, before the unit is initially placed in service.

  • Page 9: Full Lcd

    Components: a. Mode (M) Button b. Icon - Log Mode c. NiBG (Nitrogen Bar Graph) d. Icon - operating mode Surface Interval Plan NDC Time No Deco Time Remaining Deco Total Ascent Time e. O2BG (O2 Bar Graph) f. Select (S) Button g.

  • Page 10: Features And Displays

    FEATURES AND DISPLAYS...

  • Page 11: Control Buttons

    CONTROL BUTTONS The ZEN features four Control Buttons that allow you to select mode options and access specific information. They are also used to enter Settings, activate the Backlight, and acknowledge the Audible Alarm.

  • Page 12: Operating Mode Structure

    OPERATING MODE STRUCTURE Main Sequence Unless it is operating in Dive Computer mode, the ZEN will be (while at home) ON in the default WATCH MAIN TIME (home time) mode (Fig. Main Time 1), like a standard WATCH, until the Mode is changed.

  • Page 13: Operation As A Dive Computer

    AUDIBLE ALARM Most warning situations that activate the Audible Alarm while operating in NORM or GAUG Mode cause the ZEN to emit 1 beep per second for 10 seconds, or until the situation is cor- rected, or it is acknowledged by momentarily pressing and releasing the S button (less than 2 seconds).
  • Page 14 FREE Dive Mode has its own set of Alarms which emit 3 short beeps either 1 or 3 times which cannot be acknowledged or set Off. The Audible will not be active if the Alarm is Set OFF (a group A setting). Situations that will activate the NORM/GAUG 10 second Alarm include - •...

  • Page 15: Backlight

    A single short beep (which cannot be disabled) is emitted for the following - • Upon completion of a battery change. • Change from Delayed to Full Violation 5 minutes after the dive. 3 short beeps (which cannot be disabled) are emitted for the following - •...

  • Page 16: Power Supply

    ZEN is connected to a PC. POWER SUPPLY The ZEN uses (1) 3 volt CR2430 Lithium Battery. Used as a Dive Computer, the battery should operate normally for 1 year or 300 dive hours if 2 dives are conducted during each dive period.

  • Page 17: Pc Interface

    Watch Main Time. Checks are not made if the unit is wet. For a connection to be made, the Interface Cable is clipped onto the ZEN's Data Port and plugged into a PC USB Port. To establish the connection, the PC program must be running.

  • Page 18: Watch Features And Displays

    WATCH FEATURES AND DISPLAYS...

  • Page 19: Local Default Time

    LOCAL DEFAULT TIME Watch Main Time (Fig. 6) is the current Time at your home location and is normally selected as the Local Default Time. The normal Watch screen sequence accessed with momentary presses (< 2 sec each time) of the M (upper/left) button is - Main Time >>...

  • Page 20: Main Time

    While viewing any of the Watch Mode displays, depressing the M button for 2 seconds, or if no button is pressed for 2 minutes, operation will revert to the Watch Default Time screen selected. MAIN TIME, information includes (Fig. 8): >...

  • Page 21: Watch Alt Display

    > Set screens >>> Date Format >> Hour Format >> Time >> Date > Day of the Week is set automatically when the Date is set. > When the ZEN is operating in Dive Computer mode, Date is displayed only to identify dives when they are accessed in the LOG Mode •...
  • Page 22 Set Date Format While viewing the Watch Default Time screen, depressing the A and S buttons simultaneously for 2 seconds will access the Set Date Format screen displaying the graphic dAtE and the Set Point M - D or D - M flashing (Fig. 10). >...
  • Page 23 Set Time Upon access, the Set Time screen displays the graphic SET with the clock icon and the Time of Day (hr:min) with the Hour Set Point flashing (Fig. 12). • Depressing the S button while the Hour Set Point is flashing will scroll upward through the Set Points in 1 Hour increments at a rate of 8 per second.
  • Page 24 • Depressing the S button while the Year Set Point is flashing will scroll upward through the Set Points in 1 Year increments at a rate of 8 per second from 2008 to 2051 (with leap year corrections). • Pressing and releasing the S button momentarily and repeatedly (< 2 sec each time) will step upward through the Year Set Points one at a time.

  • Page 25: Alternate Time

    ALTERNATE TIME • Pressing and releasing the M button momentarily (< 2 sec) while the Watch Default Time screen is displayed will access the Watch Alternate Time screen. Information provided includes (Fig. 14): > Nitrogen Bar Graph, if any after NORM/FREE dives. >...

  • Page 26: Set Watch Alternate Time

    SET WATCH ALT TIME • ALT TIME can be set OFF, or to an Hour based numeric time Differential ranging from + 1 through +23 through - 23 through -1 (hours). • Once the Differential is selected and saved, values of ALT Time will be based upon the Main Time Set Points plus/ minus the Differential.

  • Page 27: Watch Cdt (Countdown Timer)

    WATCH CDT (COUNTDOWN TIMER) Pressing and releasing the M button momentarily 2 times (< 2 sec each time) while the Watch Default Time screen is displayed will access the Watch CDT status screen, displaying the remain- ing Countdown Time (hr:min) if running (Fig. 16A), or OFF flashing and the previously set Countdown Time if the set Count- down started and has ended, or OFF (solid) and 0:00 if no time was previously set (Fig.

  • Page 28: Set Watch Cdt

    Set Watch CDT Upon access, the Set CDT screen displays the graphics CDT and SEt and the CDT (hr:min) with clock icon, the Hour Set Point flashing (Fig. 17A). • Depressing the S button will scroll upward through the Hour Set Points in 1 hour increments at a rate of 8 per second.

  • Page 29: Chronograph

    CHRONOGRAPH (Stop Watch/Lap Timer) • Pressing and releasing the M button momentarily 3 times (< 2 sec each time) while the Watch Default Time screen is displayed will access the Chronograph displaying the elapsed time if previously started or 0:00:00.00 (hr:min:sec.1/100th sec), flashing.

  • Page 30: Daily Alarm

    • Depressing the A button for 2 seconds will Stop the Timer and Reset the Time to 0:00:00.00 (flashing). • Pressing and releasing the M button momentarily (< 2 sec) will access the Daily Alarm Status screen. • Depressing the M button for 2 seconds will revert to the Watch Default Time screen. While the Chrono is running, it will remain on the screen until a button operation is per- formed.

  • Page 31: Set Daily Alarm

    • Depressing the A and S buttons simultaneously for 2 seconds will access Set Daily Alarm. • Depressing the M button for 2 seconds will revert to the Watch Default Time screen. • If no button is pressed during a period of 2 minutes, operation will revert to the Watch Default Time screen.

  • Page 32: Dive Computer Features And Displays

    DIVE COMPUTER FEATURES AND DISPLAYS...

  • Page 33: Bar Graphs

    BAR GRAPHS The ZEN features 3 Bar Graphs >> NiBG, O2BG, and ASC. NiBG (Nitrogen Loading Bar Graph) The NiBG (Fig. 22a) represents tissue loading of nitrogen, showing your relative no decompression or decompression status. As your depth and elapsed dive time increase, segments...
  • Page 34 Oxygen Bar Graph (O2BG) The O2BG (Fig. 23a) represents oxygen accumulation, showing the maximum of either per dive accumulated oxygen, or 24 hour period accumulated oxygen. As your oxygen exposure (accumulation) increases during the dive, segments will add to the O2BG, and as saturation de- creases, it will begin to recede, indicating that additional expo- sure is allowed for that dive and 24 hour period.

  • Page 35: Alpha/Numeric Displays

    ALPHA/NUMERIC DISPLAYS Each numeric and graphic display represents a unique piece of information. It is imperative that you understand the formats, ranges, and values of the information represented to avoid any possible mis- understanding that could result in error. Depth Fig.
  • Page 36 When Times are calculated projections such as NDC and Elapsed Dive Time (Fig. 26a/b), the colon is solid (non blinking). FREE Dive Mode displays Times in minute:second format. Temperature and Date Temperature and Date can be viewed by accessing an Alternate Display while on the surface in Watch or Dive Computer mode (Fig.
  • Page 37 WARNINGS AND SAFETY RECOMMENDATIONS • It should not be considered that the capabilities built into the ZEN provide an implied approval or consent from TUSA for individuals to exceed the defined limits for recreational diving, as agreed on by all internationally recognized training agencies.

  • Page 38: Dive Computer Surface Modes

    DIVE COMPUTER SURFACE MODES...

  • Page 39: Surface Mode

    DIVE COMPUTER (DC) OPERATING MODES The ZEN features 3 selectable DC Operating Modes - • NORM >> for Normal Air or Nitrox SCUBA dives • GAUG >> for SCUBA dives with no Nitrogen/Oxygen calculations. • FREE >> for dives with no SCUBA...
  • Page 40 At any time while operating in Surface Modes, the ZEN will enter Dive Mode upon descent to 5 FT (1.5 M). • During the 2 hour pre dive surface period, if the M button is pressed/released to access Watch Mode, the DC Surface Mode must again be accessed prior to the first dive of a series (if Wet Activation is set OFF).

  • Page 41: Norm Surf Main

    NORM SURF MAIN, information provided includes (Fig. 30): > Surface Interval Time (hr:min) with clock/wave icon > Graphic Nor > Tank 1 icon representing GAS 1, which is the default start Gas and default Gas 10 minutes after a dive >...

  • Page 42: Norm Surf Alt

    NORM SURF ALT, information includes (Fig. 31): > Altitude graphic (EL2 to EL7), if above 3000 feet (915 meters), blank if below. > Temperature with degrees icon and graphic F (or C) > Date (Month.Day or Day.Month). • After 5 seconds, or pressing/releasing the A button (< 2 sec) will revert to the NORM Surface Main screen.

  • Page 43: Set Fo2 For Norm Nitrox Dives

    SETTING FO2 FOR NITROX DIVES For each value of FO2, the MOD (Max Operating Depth) that can be achieved for the PO2 Alarm limit previously set will be displayed. When the FO2 50% Default is set On and FO2 Gas 1 is set for a numerical value, 10 minutes on the surface after that dive, the FO2 for Gas 1 will be displayed as 50 and further dives will be calculated based on 50% O2 for oxygen calculations and 21% O2 for Nitrogen calculations (79% Nitrogen) unless the FO2 for Gas 1 is set before the dive.
  • Page 44 Internally, the ZEN keeps track of O2 so that if FO2 for Gas 1 is subsequently set for a numerical value, the O2 accumulated during previous AIR dives will be accounted for in the next Nitrox dive (during that dive period and series of repetitive dives).

  • Page 45: Set F Group (Fo2)

    SET F GROUP (FO2) Sequence - Set F >> FO2 Gas 1 >> FO2 Gas 2 >> FO2 50% Default. > Depressing the A and S buttons simultaneously for 2 seconds while the NORM (or GAUG) Surface Main screen is displayed will access the Set F screen (Fig. 32). >...

  • Page 46: Set Fo2 Gas 2

    • Pressing and releasing the S button momentarily and repeatedly (< 2 sec each time) will step upward through the Set Points one at a time. • Pressing and releasing the A button momentarily (< 2 sec) will save the setting and access Set FO2 Gas 2.

  • Page 47: Set Fo2 50% Default

    • Pressing and releasing the A button momentarily (< 2 sec) will save the setting and access Set FO2 50% Default. • Depressing the A and S buttons simultaneously for 2 seconds will save the setting and revert to the Set F screen. •...

  • Page 48: Set A Group (Norm/Gaug Alarms)

    SET A GROUP Sequence - Set A >> Audible >> Depth >> EDT >> NiBG >> DTR >> PO2. > Depressing the A and S buttons simultaneously for 4 seconds while the NORM (or GAUG) Surface Main screen is displayed will access the Set A screen (Fig. 36). >...

  • Page 49: Set Depth Alarm

    • Depressing the A and S buttons simultaneously for 2 seconds will save the setting and revert to the Set A screen. • Depressing the M button for 2 seconds, or if no button is pressed for a period of 2 minutes, operation will revert to the NORM (or GAUG) Surface Main screen.

  • Page 50: Set Edt (Elapsed Dive Time) Alarm

    SET EDT ALARM information includes (Fig. 39): > Graphic EDT (meaning Elapsed Dive Time). > Set Point value (hr:min), flashing, with wave/clock icons. • Depressing the S button will scroll upward through the Set Points from 0:10 to 3:00 (hr:min) in 5 minute (:05) increments at a rate of 8 per second.

  • Page 51: Set Nibg (Tissue Loading Bar Graph) Alarm

    Set NiBG Alarm information includes (Fig. 40): > Graphic NBG (meaning Nitrogen Bar Graph). > NiBG Set Point (segments), flashing. • Pressing and releasing the S button momentarily and repeatedly (< 2 sec each time) will step through the Set Point from all 5 segments (Deco) to 1 one at a time.

  • Page 52: Set Po2 Alarm

    • Pressing and releasing the S button momentarily and repeatedly (< 2 sec each time) will step upward through the Set Points one at a time. • Pressing and releasing the A button momentarily (< 2 sec) will save the setting and access Set PO2 Alarm. •...

  • Page 53: Set U Group (Utilities)

    SET U GROUP (UTILITIES) Sequence - SET U >> Wet Activation >> Units >> Safety Stop >> Conserva- tive Factor >> Backlight Duration >> Sampling Rate. > Depressing the A and S buttons simultaneously for 6 seconds while the NORM (or GAUG) Surface Main screen is displayed, will access the Set U screen (Fig.

  • Page 54: Set Units Of Measure

    Set Units information includes (Fig. 45): > Set Point icons/graphics F and FT (or C and M), flashing. • Pressing and releasing the S button momentarily (< 2 sec) will toggle between Imperial (F, FT) and Metric (C, M). • Pressing and releasing the A button momentarily (< 2 sec) will save the setting and access Set Deep Stop.

  • Page 55: Set Safety Stop

    Set Safety Stop information includes (Fig. 47): > Graphic SAF (meaning Safety Stop). > Set Point ON or OFF, flashing, with STOP icon. • Pressing and releasing the S button momentarily (< 2 sec) will toggle the Set Point between OFF and ON. •...

  • Page 56: Set Backlight Duration

    • Depressing the M button for 2 seconds, or if no button is pressed for a period of 2 minutes, operation will revert to the NORM (or GAUG) Surface Main screen. NOTE: When the Conservative Factor is set ON, the No Deco Limit times are reduced to values equivalent to those that would be available at the next higher 3000 foot (915 meter) Altitude.

  • Page 57: Set Sampling Rate

    Set Sampling Rate information includes (Fig. 50): > Graphic SR (meaning Sampling Rate). > Set Point (seconds value), flashing, with clock icon and graphic SEC. • Pressing and releasing the S button momentarily and repeatedly (< 2 sec each time) will step upward through the Set Points of 2, 5, 30, and 60 (seconds).

  • Page 58: Norm Plan Mode

    NORM (or GAUG) Surface Main screen. NOTE: The Serial Number and Firmware Revision will be requested in the event that you contact TUSA regarding the ZEN. Enter them in the Records section provided in the back of this Manual.
  • Page 59 Plan Lead-in information includes (Fig. 52): > Graphic FO2 with wave/clock/profile icons. > PO2 Alarm Set Point and graphic PO2, if FO2 is set for Nitrox, blank if set for Air. > Tank 1 icon indicating that FO2 is for Gas (mix) 1. >...

  • Page 60: Fly Mode

    Plan Depth/Time information includes (Fig. 53A/B: > NiBG (4 No Deco segments), or full O2BG, indicating which (Nitrogen or Oxygen) is in control of calculations based on previous dives. > Dive Time (hr:min) allowed for the Depth displayed. > Max Depth allowed for the PO2 Alarm value set with MAX and FT (or M) icons and graphic - PO2.

  • Page 61: Desat Mode

    • Pressing and releasing the A button momentarily 2 times (< 2 sec each time) while viewing the NORM Surface Main screen, or 1 time while viewing the GAUG Surface Main screen, will access Fly Mode. NORM SURF MAIN >> PLAN >> FLY GAUG SURF MAIN >>...
  • Page 62 When the Countdown reaches 0:00, which will generally occur prior to the Fly countdown reaching 0:00, the Dsat screen remains in the sequence of accessible NORM screens displaying 0:00 until the Fly counter turns Dive Computer operations Off 24 hours after a last dive.

  • Page 63: Norm/Gaug Log Mode

    NORM/GAUG LOG MODE Log Mode displays information from the latest 24 NORM and/or GAUG dives sequentially in reverse order (the most recent first). Log information is retained until over written by another dive. Battery removal will not affect the Log data stored for viewing. After exceeding 24 dives, data from the most recent dive completed will be recorded in the Log and the oldest dive's data deleted.
  • Page 64 Log Preview information includes (Fig. 56): > Log (book) icon. > Graphic NOR (or GAU). > Dive Mode (wave/clock/profile) icon, if NORM. > Date (month.day or day.month) the dive was conducted. > Time of Day the dive began (hr:min) with clock icon and AM (or PM) icon if set for 12 Hour Format.
  • Page 65 > Max Depth with MAX and FT (or M) icons. > ASC representing max Ascent Rate recorded for 4 seconds. • Pressing and releasing the S button momentarily (< 2 sec) will access Log Data 2. • Pressing and releasing the A button momentarily (< 2 sec) will revert to the NORM (or GAUG) Surface Main screen.

  • Page 66: History Mode

    HISTORY MODE History Mode displays information for up to 999 NORM and/or GAUG Dives, 9999 Dive Hours, and the Maximum Depth achieved. History information is retained indefinitely. Battery removal will not affect the History data stored for viewing. • History Mode can be accessed by pressing and releasing the A button momentarily 2 times (<...
  • Page 67 NORM (or GAUG) Surface Main screen. • Pressing the L button will activate the Backlight. NOTE: FREE Dives are not recorded in the viewable Log or History. The data is stored in memory for subsequent download to the TUSA PC Interface program. WARNINGS: Making decompression dives without the proper preparation and training will place you in an unnecessarily dangerous situation.

  • Page 68: Norm Dive Modes

    NORM DIVE MODES...

  • Page 69: No Deco Dive Time Remaining (Ndc)

    NO DECO DIVE TIME REMAINING (NDC) The ZEN constantly monitors No Decompression status. NDC is the maximum amount of time that you can stay at your present Depth before entering a Decompression situation. It is calculated based on the amount of Nitrogen absorbed by hypothetical tissue compartments.

  • Page 70: Oxygen Accumulation

    OXYGEN ACCUMULATION If FO2 was set for a numerical value (Nitrox), the O2BG (Fig. 62a) will add segments to represent oxygen accumulation for that dive, or 24 hour period, whichever amount is greater. If O2 reaches 100% of the allowed limit (300 OTU), the graphic O2 will replace NDC.

  • Page 71: Norm No Deco Dive Mode

    NORM NO DECOMPRESSION DIVE MODE When the Wet Activation feature is set ON, the ZEN will enter the NORM No Decompres- sion Dive Mode any time you descend to 5 FT (1.5 M) for 5 seconds. When the Wet Activation feature is set OFF, the ZEN will not enter Dive Mode upon descent unless it is operating in one of the NORM Dive Computer modes (menus) at that time.
  • Page 72 NORM No Deco ALT 1 information includes (Fig. 65) - > Temperature with degrees icon and graphic F (or C) > Time of Day (hr:min) with AM (or PM) and clock icons > Max Depth with MAX and FT (or M) icons •...

  • Page 73: No Deco Deep Stop

    No Deco Deep Stop On any No Deco dive in which Depth exceeds 80 FT (24 M), a Deep Stop Preview screen (Fig. 67) can be accessed that will display the graphic DS (meaning Deep Stop) and a recom- mended Stop Depth calculated to be 1/2 the Max Depth and a Stop Time of 02:00 (2 minutes) with a STOP icon.
  • Page 74 Press and release the A button (< 2 seconds) to access the ALT 1 screen (Fig. 69A) that displays Elapsed Dive Time, press it again to view the ALT 2 screen (Fig. 69B) that displays Temperature, Time, and Max Depth, then if a Nitrox dive press it again to view ALT 3 that displays FO2 and PO2 (Fig.

  • Page 75: No Deco Safety Stop

    No Deco Safety Stop (Fig. 70) Upon ascending to 20 FT (6 M) on any No Deco dive in which Depth exceeded 30 FT (9 M), a Safety Stop screen will appear displaying a recommended Stop at 15 FT (4.5 M) with a Count- down Timer that counts down from 03:00 to 0:00 (min:sec).

  • Page 76: Cautionary Modes

    CAUTIONARY MODES...

  • Page 77: Decompression

    DECOMPRESSION Decompression mode activates when theoretical No Decompression time and depth limits (NDLs) are exceeded. Upon Entry into Decompression, the Audible Alarm will sound until acknowledged or for 10 seconds. While the audible is sounding, the UP Arrow icon, Stop Bar icon, and full NiBG will flash to alert you.
  • Page 78 NOTE: Upon entry into Deco, the Deep Stop and Safety Stop features are disabled for the remainder of that dive, even when the Deco obligation is complete and No Deco status is regained. Managing Decompression Stops To fulfill your decompression obligation, you should make a safe controlled Ascent to a depth slightly deeper than, or equal to, the Stop Depth indicated and decompress for the Time indicated.

  • Page 79: Conditional Violation

    CONDITIONAL VIOLATION (CV) If you ascend shallower than the calculated Deco Ceiling Depth, the Audible Alarm will sound and no off gassing credit will be given, until you descend below the Ceiling Depth. If you descend below the required Ceiling before 5 minutes have elapsed, operation will continue to function in Deco and off gassing credit will resume.

  • Page 80: Delayed Violation 1

    NOTE: Upon entry into the following Violation modes, the Alarm will sound, even if Set OFF. When these events occur, the Alarm cannot be acknowledged (silenced) by pressing the S button. DELAYED VIOLATION #1 (DV1) If you remain above the required Deco Ceiling Depth for more than 5 minutes, the full NiBG will flash until you descend below the required Stop Depth.

  • Page 81: Delayed Violation 2

    DELAYED VIOLATION #2 (DV2) If the Decompression obligation requires a Ceiling Depth between 60 FT (18 M) and 70 FT (21 M), the full NiBG and TAT (Total Ascent Time) digits will flash. When this occurs, you must make a controlled ascent to just deeper than, and stay as close as possible to, 60 FT (18 M) without causing the NiBG and TAT to flash.

  • Page 82: Delayed Violation 3

    DELAYED VIOLATION #3 (DV3) If you descend deeper than the MOD (Max Operating Depth) of 330 FT (99.9 M), the Up Arrow icon will flash, and the Current Depth will only display 3 dashes ( - - - ) flashing signifying that you are Out of Range.

  • Page 83: Violation Gauge Mode

    Mode (VGM) for the remainder of that dive and for 24 hours after surfacing. VGM turns the ZEN into a digital instrument without any nitrogen or oxygen calculations or monitoring functions or displayed information until 24 contiguous hours elapse on the surface with no dives.
  • Page 84 This condition is a Permanent Violation, and in the event that a dive is made during the 24 hour period, a full 24 hour surface interval must then be served before all functions are restored. VGM Main (on surface) information includes (Fig. 78) - >...

  • Page 85: High Po2

    HIGH PO2 When partial pressure of oxygen (PO2) becomes equal to, or greater than, 0.2 (ATA) less than the PO2 Alarm value set; the Audible will sound. Note that while in Deco, High PO2 will only alarm at 1.60. • Press/release the S button to acknowledge/silence the alarm.

  • Page 86: High O2

    HIGH O2 The O2BG (Fig. 80a) represents oxygen accumulated as a result of the repetitive Nitrox dives you have conducted during that operating period. The O2BG lets you monitor how close you are coming to the limits of oxygen exposure. If the theoretical amount of oxygen accumulated reaches the limit for a single exposure, or 24 hour period (300 OTU = 100%), the graphic O2 replaces NDC time and the full O2BG and Up...
  • Page 87 • Until it has shut itself off, you must not use the ZEN at a different Altitude than the Altitude at which it was activated. Doing so will result in an error equal to the difference in barometric pressure, and possibly a false dive mode with erroneous data.

  • Page 88: Switching Gas Mixes

    SWITCHING GAS MIXES...
  • Page 89 SWITCHING GAS MIXES (NORM only) During NORM Dives, the FO2 calculations/displays can be switched from Gas 1 to 2. > Switching Gas cannot be performed while on the surface. > Every dive begins with Gas 1 and 10 minutes after surfacing from a multiple gas dive, operation defaults to the Gas 1 FO2.
  • Page 90 To access the Preview screens while viewing a NORM Dive Main screen. • Depress the M button for 2 seconds to view the Gas 1 Preview screen. • Press and release the M button momentarily (< 2 sec) while the Gas 1 Preview screens is displayed to view the Gas 2 Preview screen.
  • Page 91 GAS SWITCH ROUTINE NORM DIVE MAIN 2 sec Switches from GAS 1 Gas 2 to Gas 1 (after 3 sec) PREVIEW 2 sec < 2 sec Switches from GAS 2 Gas 1 to Gas 2 (after 3 sec) PREVIEW 2 sec <...

  • Page 92: Norm Post Dive Modes

    NORM POST DIVE MODES...

  • Page 93: First 10 Minutes On Surface

    POST DIVE FIRST 10 MINUTES ON SURFACE When you ascend to 2 FT (0.6 M) for 1 second, the Surface Main screen will be dis- played. If you descend during the first 10 minutes after surfacing (referred to as the Transition Period), time underwater will be considered a continuation of that dive.

  • Page 94: After 10 Minutes On Surface

    POST DIVE AFTER 10 MINUTES ON SURFACE Once 10 minutes have elapsed, the Surface Interval time colon will stop flashing indicating that the Dive and Transition Period are completed, and a subsequent descent will be considered a new dive. Operation will revert to the Watch Default Time screen.

  • Page 95: Uploading Settings And Downloading Data

    UPLOADING SETTINGS AND DOWNLOADING DATA The ZEN is configured with a Data Port located on the back of the left side that enables it to be connected to a PC through a USB port using the special Interface Cable supplied.

  • Page 96: Gauge Operating Mode

    GAUGE OPERATING MODE...

  • Page 97: Digital Gauge Mode

    DIGITAL GAUGE MODE When Digital Gauge Mode (GAUG) is selected as the operating mode, the ZEN will operate as a Digital Depth Gauge/Timer without performing nitrogen and oxygen calcula- tions. • To access Gauge mode while the Watch Default Time screen is displayed, press the M button 2 times (2 seconds each time), or while the NORM Surface Main screen is displayed, press the M button 1 time for 2 seconds.
  • Page 98 Fig. 88 - GAUG SURF ALT NOTE: Once a dive is made in Digital Gauge Mode, you must wait 24 contiguous hours after surfacing before the ZEN resets and will operate as an Air or Nitrox dive computer in NORM Mode or FREE Dive Mode.
  • Page 99 Gauge Dive ALT information includes (Fig. 90) - > Temperature with degrees icon and graphic F (or C) > Time of Day (hr:min) with clock and AM (or PM) icons > Max Depth with FT (or M) and MAX icons •...

  • Page 100: Free Dive Operating Mode

    FREE DIVE OPERATING MODE...

  • Page 101: Free Surface Main And Alt

    FREE DIVE MODE When Free Dive Mode is selected as the operating mode, the ZEN will operate with select features. Nitrogen loading is calculated based on a default FO2 of AIR and the amount remaining during 24 hours is carried over between FREE and NORM operating modes.
  • Page 102 • Press and release the A button momentarily (< 2 sec) to FREE Mode uses the access the Free Surface ALT 1 screen, then again ALT 2. Watch and NORM/ • Depress the A button for 2 seconds to access the FREE CDT GAUG settings for - (Count Down Timer) Status screen.

  • Page 103: Free Countdown Timer (Cdt)

    Free Surface ALT 2 information includes (Fig. 94) - > Temperature with degrees icon and graphic F (or C) > Time of Day with clock and AM (or PM) icons > The display will revert to the Main after 5 seconds or if the A button is pressed/released.

  • Page 104: Set Free Cdt

    • Pressing and releasing the S button momentarily (< 2 sec) will toggle between ON and OFF. A toggle to ON will Start the CDT if a Time has been set. • Depressing the A and S buttons simultaneously for 2 seconds will access Set Free CDT.
  • Page 105 • Pressing and releasing the S button momentarily and repeatedly (< 2 sec each time) will step upward through the Set Points one at a time. • Pressing and releasing the A button momentarily (< 2 sec) will save the Minute Set Point and the Second digits will flash.

  • Page 106: Free Elapsed Dive Time (Edt) Alarm

    FREE DIVE EDT (ELAPSED DIVE TIME) ALARM The Free EDT Alarm is factory set for 30 seconds. When set ON, the Alarm will sound 3 short beeps and the graphic EDT and Time digits will flash every 30 seconds (Fig. 98). •...

  • Page 107: Free Depth Alarms (Das)

    FREE DIVE DEPTH ALARMS (DA) Free Dive mode features 3 Depth Alarms (DAs) that can be Set at progressively deeper Depths and turned OFF/ON. > If Alarm 1 is set OFF, then Alarms 2 and 3 will be disabled. > If Alarm 2 is set OFF, Alarm 3 will be disabled. When each alarm Depth set is reached during a dive, 3 short beeps will sound 3 times and the graphic DA1 (DA2, DA3) and Fig.
  • Page 108 • Pressing and releasing the A button momentarily (< 2 sec) will accept the ON/OFF setting, and if OFF is selected operation will revert to the Free Surface Main screen, or if ON is selected the Depth digits will flash allowing them to be set (Fig.

  • Page 109: Free Dive Main And Alts

    Free Dive Main information includes (Fig. 104) - > NiBG, if any Nitrogen remaining from NORM or FREE dives conducted within the previous 24 hours > NDC Time (min:sec) with wave/clock/profile icons > Temperature with degrees icon and graphic F (or C) >...

  • Page 110: Free Dive Alarms

    Free Dive ALT 2 information includes (Fig. 106) - > Time of Day with clock and AM (or PM) icons > Max Depth with MAX and FT (or M) icons > The display will revert to the Main after 5 seconds or if the A button is pressed/released.
  • Page 111 Free Depth Alarms When Depth reaches the Free Depth Alarm 1 Set Point, 3 short beeps will sound 3 times during which the graphic DA1 will flash (Fig. 108), then NDC will be restored. The audible and flashing graphic will be repeated when Depth reaches the DA 2 and DA 3 Set Points, if set ON.
  • Page 112 When Nitrogen loading increases to the Caution level, 3 short beeps will sound 3 times; and 4 NiBG No Deco segments, the Up Arrow icon, and the graphic NBG (in place of NDC) will be displayed (flashing) (Fig. 110). After the beeps, the flashing will continue until the NiBG recedes to 3 segments at which time the NDC will be restored and the Up Arrow icon will be removed.
  • Page 113 The mathematical model currently used in the ZEN is based on no decompression/decompression multilevel repetitive dive schedules. This algorithm does not take into account the physiological changes associated with the high pressures that competitive type Free diving can expose a diver to.

  • Page 114: Reference

    REFERENCE...

  • Page 115: Care And Cleaning

    Protect the lens against scratches with an instrument lens protector. • Soak and rinse the ZEN in fresh water at the end of each day of diving, and check to ensure that the areas around the Low Pressure (Depth) Sensor (Fig. 112a), PC Interface Data Port (Fig.

  • Page 116: Battery Replacement

    Inspect the Buttons, Lens, and Housing to ensure they are not cracked or damaged. If there is any sign of moisture in the ZEN, DO NOT attempt to use it for diving (NORM, GAUG, or FREE) until it receives proper factory service by TUSA.

  • Page 117: Battery Removal

    Battery Removal • Locate the Battery Compartment on the back of the unit. • Rotate the Battery Hatch clockwise 10 degrees using the special Battery Hatch Tool provided (Fig. 113A), or - by pushing the lower portion to the left while pushing the upper portion to the right using your fingers (Fig.

  • Page 118: Battery Installation

    INSTALLATION the unit. WARNING: If damage or corrosion is found, return your ZEN to an Authorized TUSA Dealer, and DO NOT attempt to use it until it has re- ceived factory prescribed service. Battery Installation •...
  • Page 119 • Verify all Set Points prior to diving. • If any portions of the display are missing or appear dim, or if a Low Battery condition is indicated, return your ZEN to an Authorized TUSA Dealer for a complete evaluation before attempting to use it.

  • Page 120: Altitude Sensing And Adjustment

    1 foot (30 cm) of each other to record that ambient pressure as the current Altitude. The Mathematical Model in the ZEN accounts for the reduced No Deco Dive Times avail- able based on National Oceanic and Atmospheric Administration (NOAA) guidelines.

  • Page 121: Charts Of No Decompression Limits At Altitude

    14,000 feet (4,270 meters). If the Conservative Factor is set ON while at Sea Level, calculations are based upon an Altitude of 6,000 feet. The ZEN will not function as a Dive Computer above 14,000 feet (4,270 meters). PELAGIC Z+ ALGORITHM >> NDLS (HR:MIN) AT ALTITUDE (IMPERIAL)

  • Page 122: Chart Of Oxygen Exposure Limits

    PELAGIC Z+ ALGORITHM >> NDLS (HR:MIN) AT ALTITUDE (METRIC) Altitude 1221 1526 1831 2136 2441 2746 3051 3356 3661 3966 (meters) 1220 1525 1830 2135 2440 2745 3050 3355 3660 3965 4270 Depth ( M ) 3:37 2:41 2:31 2:23 2:16 2:10 2:04...

  • Page 123: Error (Reset) During A Dive

    ERROR (RESET DURING A DIVE) If the ZEN shuts Off then turns On again for any reason during any Dive, the message ERR (Error) will be displayed with the Up Arrow icon and current Depth. If this occurs, it is highly recommended that you terminate the dive and begin a safe controlled ascent to the surface.

  • Page 124: Specifications

    SPECIFICATIONS DIVE COMPUTER SURFACE SEQUENCE/MODES CAN BE USED AS • NORM > GAUG > FREE Surface Main • Watch • SURF ALT (Altitude, Temp, Time) • Air Computer • Plan (30 to 190 FT, 9 to 57 M) - NORM only •...
  • Page 125 • Backlight Duration (0, 5, 10 seconds) ~ 5 (sec) • Sampling Rate (2, 15, 30, 60 seconds) ~ 30 (sec) • ZEN (Watch) Serial Number > Factory set ~ actual NORM No Deco Dive Displays: • Main - NiBG, O2BG, Dive Time Remaining, Elapsed Dive Time, Current Depth, ASC •...
  • Page 126 SPECIFICATIONS (CONTINUED) Digital GAUG Dive Displays: • Main (default) - graphic GAU, Elapsed Dive Time, Current Depth, ASC • ALT - Temperature, Time of Day (hr:min), Max Depth FREE Dive Displays: • Main (default) - Dive Time Remaining, Temperature, Elapsed Dive Time (min:sec), Current Depth •...
  • Page 127 SPECIFICATIONS (CONTINUED) • Watch Countdown Timer 23:59 to 0:00 hr:min 1 minute • Free Countdown Timer 59:59 to 0:00 min:sec 1 second • Chronograph 0:00:00.00 to 99:59:59.99 1/100 second hr:min:sec.1/100 sec • Out of Range (- - -) => 330 FT (99.9 M) •...
  • Page 128 SPECIFICATIONS (CONTINUED) OPERATIONAL PERFORMANCE Function: Accuracy: • Depth ±1% of full scale • Timers 1 second per day Dive Counter: • NORM/GAUG displays Dives #1 to 24, FREE displays #1 to 99 (0 if no dive made yet) • Resets to Dive #1, upon diving (after 24 hours with no dives) NORM/GAUG Dive Log Mode: •...
  • Page 129 SPECIFICATIONS (CONTINUED) Battery Indicator: • Warning - icon on solid at 2.75 volts, Battery change recommended • Alarm - icon on flashing at 2.50 volts, change the Battery Dive Computer Mode Activation: • Manual - push button (recommended), required if Wet Activation is set OFF. •...
  • Page 130 RESPONSIBLE COMPUTER DIVING • Plan each dive, and dive your plan. The ZEN was not designed to make decisions for you, only to provide you with the information you need to make responsible decisions for yourself. This begins with a dive Plan that will help you avoid a low air or decompression situation.

  • Page 131: Tusa International

    TUSA INTERNATIONAL CONTACTS Tabata USA, Inc Tabata Europe Corporation B.V. 2380 Mira Mar Avenue Den Brielstraat 2 B, 1055 RV Long Beach, CA 90815 Amsterdam, The Netherlands Tel: 562-498-3708 Tel: 31-(0)20 68 15 955 Fax: 562-498-0415 Fax: 31-(0)20 68 24 527 www.tusa.com...

  • Page 132: Inspection/ Service Record

    INSPECTION / SERVICE RECORD ZEN Serial Number: ______________________________________________________ ZEN Firmware Revision: ______________________________________________________ Date of Purchase: ______________________________________________________ Purchased from: _____________________________________________________ Below to be filled in by the Authorized TUSA Dealer: Date Service Performed Dealer / Technician...

Table of Contents