Tusa ZEN AIR IQ-950 Owner's Manual
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Tusa ZEN AIR IQ-950 Owner's Manual

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Summary of Contents for Tusa ZEN AIR IQ-950

  • Page 2: Table Of Contents

    CONTENTS WARRANTY, NOTICES, DECOMPRESSION MODEL ....................7 INITIAL ACTIVATION ................................8 FEATURES AND DISPLAYS ............................9 INTRODUCTION AND CONTROL BUTTONS ......................10 OPERATING MODE STRUCTURE ...........................11 OPERATION AS A DIVE COMPUTER ........................12 AUDIBLE ALARM ..............................12 BACKLIGHT ................................14 POWER SUPPLY...............................15 WATCH FEATURES AND DISPLAYS ..........................17 LOCAL DEFAULT TIME ............................18 MAIN TIME ................................19 Set Main Time ...............................20...
  • Page 3 CONTENTS (continued) DIVE COMPUTER SURFACE MODES ..........................37 SURFACE MODE ..............................38 Normal Surface Main ............................40 Normal Surface ALT ..............................41 ZEN AIR Battery Status ............................41 TRT Status ................................42 NORM/GAUG SET MODES ............................42 Setting FO2 for Nitrox Dives ..........................43 SET F GROUP (FO2) ..............................45 Set FO2 Gas 1 ..............................45 Set FO2 Gas 2 (3) ..............................46 Set FO2 50% Default ............................47...
  • Page 4 CONTENTS (continued) SERIAL NUMBER ..............................57 NORM PLAN MODE ..............................57 FLY MODE .................................60 DESAT MODE (NORM) .............................61 NORM/GAUG LOG MODE ............................62 HISTORY MODE (NORM/GAUG) ..........................65 NORM DIVE MODES ..............................67 POSITIONING OF THE ZEN AIR ..........................69 Link Interruption Underwater ..........................69 NO DECO DIVE TIME REMAINING (DTR) .......................70 Oxygen Accumulation Time Remaining (OTR) .....................71 Air Time Remaining (ATR) ............................71 ATR Alarm ................................72...
  • Page 5 INSTALLING A TRANSMITTER ON A REGULATOR.....................123 TRANSMITTER COMPATIBILITY WITH NITROX ....................124 ALTITUDE SENSING AND ADJUSTMENT ......................125 CHART OF OXYGEN EXPOSURE LIMITS ......................126 CHARTS OF NO DECOMPRESSION LIMITS AT ALTITUDE ................127 SPECIFICATIONS ..............................128 ERROR DURING A DIVE ............................134 INSPECTION/ SERVICE RECORD .........................135 TUSA INTERNATIONAL CONTACTS ........................136...

  • Page 6: Warranty, Notices, Decompression Model

    © 2002 Design, 2010 San Leandro, CA USA 94577 TRADEMARK NOTICE TUSA, the TUSA logo, ZEN AIR, and the ZEN AIR logo, are all registered and unregistered trademarks of Tabata USA and Tabata Corp. Ltd. All rights are reserved. PATENT NOTICE U.S.

  • Page 7: Initial Activation

    NOTICE STORAGE and INITIAL ACTIVATION ZEN AIR Watch/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. In this mode, Date and Time are updated as they normally would be.

  • Page 8: Features And Displays

    FEATURES AND DISPLAYS...

  • Page 9: Introduction And Control Buttons

    INTRODUCTION Welcome to TUSA and thank you for choosing the ZEN AIR ! It is extremely important that you read this Owner's Manual in sequence and understand it completely before attempting to use the ZEN AIR as a dive computer.

  • Page 10: Operating Mode Structure

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

  • Page 11: Operation As A Dive Computer

    OPERATION AS A DIVE COMPUTER The ZEN AIR features 3 Dive Computer (DC) Operating Modes, NORM (Fig. 2A) which is used for Air and Nitrox dives, GAUG (Fig. 2B) used for dives in which Nitrogen-Oxygen calculations are not performed, and FREE (Fig. 2C) used for activities that do not use SCUBA.
  • Page 12 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 13: Backlight

    A single short beep (which cannot be disabled) is emitted for the following - • Upon completion of a Hot Swap 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 14: Power Supply

    NOTE: Extensive use of the Backlight reduces estimated Battery life. Also, the Backlight does not operate during a Low ZEN AIR Battery Con- dition or when the ZEN AIR is connected to a PC. POWER SUPPLY The ZEN AIR 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 15 Transmitters (TRTs) each use (1) 3 volt, CR2 Lithium Battery. A TRT's battery should provide normal operation for 1 year or 300 dive hours. TRTs check battery voltage when they are pressur- ized and will send a Low Battery signal to the Receiver in the ZEN AIR when the voltage drops below the Warning level.

  • Page 16: Watch Features And Displays

    WATCH FEATURES AND DISPLAYS...

  • Page 17: Local Default Time

    LOCAL DEFAULT TIME Watch Main Time (Fig. 7) 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 (less than 2 seconds each) of the M button is - Main Time >...

  • Page 18: 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 displayed includes (Fig. 9): >...

  • Page 19: Set Main Time

    WATCH ALT DISPLAY, information includes (Fig. 10): > 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, operation will revert to the Watch Default Time screen.

  • Page 20: Set Date Format

    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. 11). >...
  • Page 21 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. 13). • S (hold) 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 22 • S (hold) 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 2009 to 2052 (with leap year corrections). • S (repeatedly, < 2 sec each time) will step upward through the Year Set Points one at a time.

  • Page 23: Alternate Time

    ALTERNATE TIME • M (< 2 sec) while the Watch Default Time screen is displayed will access the Watch Alternate Time screen. Information provided includes (Fig. 15): > Nitrogen Bar Graph, if any after NORM/FREE dives. > O2 Bar Graph, if any after NORM Nitrox dives. >...

  • Page 24: Set 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 25: 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. 17A), or OFF flash- ing and the previously set Countdown Time if the set Countdown started and has ended, or OFF (solid) and 0:00 if no time was previously set (Fig.

  • Page 26: Set 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. 18A). • S (hold) will scroll upward through the Hour Set Points in 1 hour increments at a rate of 8 per second.

  • Page 27: Chronograph

    CHRONOGRAPH (Stop Watch/Lap Timer) • M (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. • S (< 2 sec) will Start the Timer which will begin counting up from 0:00:00.00 to 9:59:59.99 (hr:min:sec.1/100th sec) in increments of .01 (1/100th sec).

  • Page 28: Daily Alarm

    While the Chrono is running, it will remain on the screen until a button operation is performed. If another screen is accessed, it will then continue to run in the background. Upon descending on a dive, Chrono operation will be terminated and reset to 0:00:00.0.

  • Page 29: Set Daily Alarm

    SET DAILY ALARM, information provided includes (Fig. 22): > Graphics AL and SEt with clock (alarm) icon. > Alarm Time previously set (hr:min) with the Hour Set Point flashing. • S (hold) while the Hour digits are flashing will scroll upward through the Set Points in 1 Hour increments at a rate of 8 per second.

  • Page 30: Dive Computer Features And Displays

    DIVE COMPUTER FEATURES AND DISPLAYS...

  • Page 31: Bar Graphs

    BAR GRAPHS The ZEN AIR features 3 Bar Graphs >> NiBG, O2BG, and ASC. NiBG (Nitrogen Loading Bar Graph) The NiBG (Fig. 23a) represents tissue loading of nitrogen, show- ing your relative no decompression or decompression status. As your depth and elapsed dive time increase, segments will add to the NiBG, and as you ascend to shallower depths, the segments will recede, indicating that additional no decompression time is allowed for multilevel diving.
  • Page 32 Oxygen Bar Graph (O2BG) The O2BG (Fig. 24a) 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 decreas- es, it will begin to recede, indicating that additional exposure is allowed for that dive and 24 hour period.

  • Page 33: Alpha / Numeric Displays

    ALPHA / NUMERIC DISPLAYS Tank Pressure When the ZEN AIR's Receiver is set ON and active, Tank Pres- sure from the active Transmitter that is properly linked will be displayed on the NORM or GAUG MAIN screens (Fig. 25a). Values of Pressure are displayed numerically from 000 PSI (00 BAR) up to 5,000 PSI (345 BAR) in increments of 5 PSI (1 BAR).
  • Page 34 When Times are calculated projections such as NDC and Elapsed Dive Time (Fig. 27a/b), the colon is solid (non blinking). FREE Dive Mode displays Times in minute:second format. Temperature, Date, Elevation Elevation, Temperature, and Date can be viewed by accessing the Watch Alternate Display (Fig.
  • Page 35 • It should not be considered that the capabilities built into the ZEN AIR provide an implied approval or consent from TUSA for individuals to exceed the de- fined limits for recreational diving, as agreed on by all internationally recog- nized training agencies.

  • Page 36: Dive Computer Surface Modes

    DIVE COMPUTER SURFACE MODES...

  • Page 37: Surface Mode

    DIVE COMPUTER (DC) OPERATING MODES The ZEN AIR features 3 selectable DC Operating Modes - • NORM >> for Normal Air or Nitrox dives. • GAUG >> for dives with no Nitrogen/Oxygen calculations. • FREE >> for dives with no SCUBA. SURFACE MODE Depressing the M button for 2 seconds while the Local Default Watch Default Time screen is displayed will access the selected the NORM, GAUG, or FREE Surface Main screen.
  • Page 38 At any time while operating in Surface Modes, the ZEN AIR 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 to access other screens in the Watch Mode sequence, Surface Mode must again be accessed prior to the first dive of a series (if Wet Activation is set OFF).

  • Page 39: Normal Surface Main

    NORM SURF MAIN, information provided includes (Fig. 31): > Surface Interval Time (hr:min) with clock/wave icon > Tank Pressure with PSI (or BAR), TRT in use > Graphic Nor > Tank icon (1, 2, or 3) representing Gas/TRT in use, 1 is the default upon start and 10 minutes after a dive (no dive yet) >...

  • Page 40: Normal Surface Alt

    • If a Transmitter (TRT) is not active and linked to the ZEN AIR, a Not Available message will appear. • Each screen will be displayed for 3 seconds. ZEN AIR Battery Status, then TRT 1 Battery/Pressure, then TRT2, then TRT 3.

  • Page 41: Trt Status

    TRT STATUS, information includes (Fig. 34): > Graphics BAT and trt with Tank (1, 2, or 3) icon. > Tank Pressure with PSI (or BAR) icon. > Graphic Good or Lo. - - or - - > Graphics NOT, AvAil, and trt with Tank icon if that TRT is not in use or not reporting.

  • Page 42: Setting Fo2 For 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 43 MODs affected by the PO2 limit set will not be displayed when FO2 for Gas 1 is set to AIR. Internally, the ZEN AIR keeps track of the 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 44: Set F Group (Fo2)

    SET F GROUP (FO2) Selections >> Gas 1 >> Gas 2 >> Gas 3 >> 50% Default. > A and S (simultaneously for 2 sec) while NORM Surface Main is displayed will access Set F (Fig. 35). > A (< 2 sec) will then access Set FO2 Gas 1. SET FO2 GAS 1, information includes (Fig.

  • Page 45: Set Fo2 Gas 2 (3)

    • M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main. SET FO2 GAS 2, information includes (Fig. 37): > Graphic FO2 > Max Depth allowed for the PO2 Alarm Set with MAX and FT (or M) icons and graphic - PO2, blank if Air >...

  • Page 46: Set Fo2 50% Default

    SET FO2 50% DEFAULT, information includes (Fig. 38): > Graphics FO2, dFLt, and 50. > Set Point graphic OFF (or ON), flashing. • S (< 2 sec) will toggle between OFF and ON. • A (< 2 sec) will save the setting and revert to SET F. •...

  • Page 47: Set Depth Alarm

    SET AUDIBLE ALARM, information includes (Fig. 40): > Graphic AUD. > Set Point graphic ON (or OFF), flashing. • S (< 2 sec) will toggle between ON and OFF. • A (< 2 sec) will save the setting and access Set Depth Alarm.

  • Page 48: Set Edt Alarm

    SET EDT ALARM, information includes (Fig. 42): > Graphic EDT (Elapsed Dive Time). > Set Point value (hr:min), flashing, with wave/clock icon. • S (hold) will scroll through the Set Points from 0:10 to 3:00 (hours:minutes) in 5 minute (:05) increments at a rate of 8 per second.

  • Page 49: Set Dtr Alarm

    SET DTR ALARM, information includes (Fig. 44): > Set Point value (min), flashing, with wave/clock/profile and AIR icons. • S (hold) will scroll through the Set Points from 0:00 to 0:20 (min) in 1 minute (0:01) increments at a rate of 8 per second.

  • Page 50: Set End Alarm

    • A and S (simultaneously for 2 sec) will save the setting and revert to SET A. • M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main. SET END ALARM, information includes (Fig. 46): >...

  • Page 51: Set U Group (Utilities)

    • A (< 2 sec) will save the setting and revert to SET A. • A and S (simultaneously for 2 sec) will save the setting and revert to SET A. • M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

  • Page 52: Set Units Of Measure

    SET UNITS, information includes (Fig. 50): > Set Point icons/graphics PSI, F, and FT (or BAR, C, and M), flashing. • S (< 2 sec) will toggle between Imperial and Metric. • A (< 2 sec) will save the setting and access Set Deep Stop. •...

  • Page 53: Set Norm Safety Stop

    SET NORM SAFETY STOP, information includes (Fig. 52): > Graphic SAF (Safety Stop). > Set Point OFF (or OFF), flashing, with STOP icon. • S (< 2 sec) will toggle between OFF and ON. • A (< 2 sec) will save the setting and access Set CF. •...

  • Page 54: Set Backlight Duration

    SET BACKLIGHT DURATION, information includes (Fig. 54): > Graphics BL (BackLight), dur (duration), and SEC (seconds). > Set Point, flashing, with clock icon. • S (< 2 sec) will step through the Set Points of 0, 5, and 10 (sec). •...

  • Page 55: Set Trt 1 (2, 3)

    SET TRT 1, information includes (Fig. 56): > Graphic TRT1 with Tank 1 icon. > Set Point graphic OFF (or ON) flashing. > TRT Serial Number (Link Code), up to 6 digits. • S (< 2 sec) will toggle between OFF and ON. •...

  • Page 56: Serial Number

    Surface Main. The Serial Number and Firmware Revision will be requested in the event that you contact TUSA regarding the ZEN AIR. Enter them in the Records section provided in the back of this Manual.
  • Page 57 NOTE: No Decompression Dive Times in Plan Mode are based on the FO2 setting for Gas 1. The FO2 settings for Gas 2 and 3 are not utilized for Plan calculations. • S (< 2 sec) while the NORM Surface Main is displayed will access Plan Lead-in.
  • Page 58 NOTE: When the Conservative Factor is set ON, No Decompression Dive times are reduced to the values of the next 3000 foot (915 meter) higher Altitude. Plan Depth/Time, information includes (Fig. 59): (Nitrogen control) > NiBG (4 No Deco segments), or O2BG (4 segments), indicating which (Nitrogen or Oxygen) is in control of calculations based on previous dives.

  • Page 59: Fly Mode

    FLY MODE Time to Fly is a counter that begins counting down 10 minutes after surfacing from a dive from 23:50 to 0:00 (hr:min). Ten minutes after a dive, operation reverts to the Watch Default Time screen at which time the Time to Fly countdown continues in the background.

  • Page 60: Desat Mode (Norm)

    DESAT MODE (NORM only) The Time to Desaturate counter provides calculated time for Tissue Desatuation at sea level taking into consideration the Conservation Factor setting. It begins counting down 10 minutes after surfacing from a dive, counting down from 23:50 (hr:min) max to 0:00. When the Countdown reaches 0:00, which will generally occur prior to the Fly countdown reaching 0:00, the Desat screen remains in the sequence of accessible NORM screens displaying 0:00 until the Fly counter shuts the Dive Computer operations Off 24 hours after...

  • Page 61: Norm/Gaug Log Mode

    • A (< 2 sec) will revert to NORM Surface Main.. • M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main. • L (press) will activate the Backlight. NORM/GAUG LOG MODE Log Mode displays information from the latest 24 NORM and/or GAUG dives sequen- tially in reverse order (the most recent first).
  • Page 62 • M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main. • L (press) will activate the Backlight. Log Preview, information includes (Fig. 62): > Log (book) icon. > Graphic NOR (or GAU). >...
  • Page 63 > Max Depth with MAX and FT (or M) icons. > ASC, segments representing max Ascent Rate recorded for 4 seconds. • S (< 2 sec) will access Log Data 2. • A (< 2 sec) will revert to NORM (or GAUG) Surface Main. •...

  • Page 64: History Mode (Norm/Gaug)

    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 65 Surface Main. • L (press) 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 66: Norm Dive Modes

    NORM DIVE MODES...
  • Page 67 Poor Reception Distance (greater than 6 feet/2 meters) Best Reception Area Poor Poor Reception Reception Area Area Poor Poor Reception Reception Area Area Transmitter Signal Reception Guide...

  • Page 68: Positioning Of The Zen Air

    POSITIONING OF THE ZEN AIR The Transmitters (TRTs) emit low frequency signals that radiate outward in semicircular pat- terns that are parallel to the length dimension of the TRT. A coiled antenna inside the ZEN AIR receives the signals when it is positioned within a zone parallel to or at a 45 degree angle to the TRT as illustrated on page 68.

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

    When using a Strobe, a temporary interruption may occur shortly after the Strobe flashes. The Link will be restored within 4 seconds. NO DECO DIVE TIME REMAINING (DTR) The ZEN AIR constantly monitors No Decompression status (NDC), O2 accumulation, and Air Time Remaining, and displays whichever one is the least amount available at the time as DTR.

  • Page 70: Oxygen Accumulation Time Remaining (Otr)

    This is a feature of the Decompression model that is the basis for multilevel diving, one of the most important advantages that the ZEN AIR offers. Oxygen Accumulation If FO2 was set for a numerical value (Nitrox), the O2BG (Fig. 69a) will add segments to represent oxygen accumulation for that dive, or 24 hour period, whichever amount is greater.

  • Page 71: Atr Alarm

    This rate of consumption is then used in conjunction with a knowledge of the depth dependence to predict the air required for the diver to make a safe controlled ascent including any Stops. Air consumption and depth are continuously monitored and ATR reflects any change in circumstances.

  • Page 72: Ascent Rate Indicator (Asc)

    Example of ATR Alarm: • You set the End Pressure Alarm for 300 PSI (20 BAR). • You are at a Depth of 60 FT (20 M). • Air Time Remaining decreases to 0:00. • You Ascend at a maximum rate of 30 FPM (10 MPM). •...

  • Page 73: Norm No Deco Dive Mode

    NORM NO DECOMPRESSION DIVE MODE When the Wet Activation feature is set ON, the ZEN AIR will enter the NORM No Decompression 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 AIR will not enter Dive Mode upon descent unless it is operating in one of the NORM Dive Computer modes (menus) at that time.
  • Page 74 NORM No Deco ALT 1,information includes (Fig. 75) - > ATR (hr:min) with wave/clock/profile and AIR icons. > Temperature with degrees icon and graphic F (or C). > Time of Day (hour:minute). > Tank icon, Gas/TRT in use (1, 2, or 3). >...

  • Page 75: 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. 77) can be accessed that will display the graphic DS (meaning Deep Stop) and a recommend- ed Stop Depth calculated to be 1/2 the Max Depth and a Stop Time of 02:00 (2 minutes) with a STOP icon.
  • Page 76 • A (< 2 sec) to view ALT 1 (Fig. 79) - Pressure, EDT. ALT 1 • A (< 2 sec) again to view ALT 2 - ATR, Temperature, Time, Max Depth. • A (< 2 sec) again to view ALT 3 (if Nitrox) - FO2, PO2. •...

  • Page 77: No Deco Safety Stop

    No Deco Safety Stop (Fig. 80) Upon ascending to 20 FT (6 M) on any No Deco dive in which Depth exceeded 30 FT (9 M), a Safety Stop (SS) screen will appear displaying a recommended Stop at 15 FT (4.5 M) with a Countdown Timer that counts down from 03:00 to 0:00 (min:sec).

  • Page 78: Cautionary Modes

    CAUTIONARY MODES...

  • Page 79: Decompression

    DECOMPRESSION Decompression mode activates when theoretical No Decompression time and depth limits (NDLs) are exceeded. Upon Entry into Decon, the Audible will sound until acknowledged or 0 seconds. While it is sounding, the UP Arrow icon, Stop Bar icon, and full NiBG will flash to alert you. Deco Entry information includes (Fig.

  • Page 80: Managing Decompression Stops

    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. The amount of decompression credit time that you receive is dependent on Depth, with slightly less credit given the deeper you are below the Stop Depth indicated.

  • Page 81: Violation Modes

    CONDITIONAL VIOLATION (CV) If you ascend shallower than the calculated Deco Stop Depth, no off gassing credit will be given. If you descend below the Stop Depth before 5 minutes have elapsed, operation will continue to function in Deco and off gassing credit will resume. CV Main, information includes (Fig.
  • Page 82 DELAYED VIOLATION #1 (DV1) If you remain above the required Deco Stop Depth for more than 5 minutes, the full NiBG will flash until you descend below the required Stop Depth. This is a continuation of CV. DV1 Main, information includes (Fig. 84) - >...
  • Page 83 DV2 Main, information includes (Fig. 85) - > Full NiBG (flashing). > O2BG if applicable. > TAT (hr:min) flashing with Deco mode icon. > Stop Depth with FT (or M) icon and STOP icon. > Stop Time (hr:min) with clock icon. >...
  • Page 84 DV3 Main, information includes (Fig. 86) - > NiBG, O2BG, ASC - if applicable. > DTR as 0:00 (hr:min) with wave/clock/profile icon. > EDT (hr:min) with wave/clock icon. > Tank icon (Gas 1, 2, or 3). > Up Arrow icon (flashing). >...
  • Page 85 VGM Main, information includes (Fig. 87) - > Full NiBG and full O2BG, all segments flashing. > Graphic VIO, flashing until the audible is silenced then solid. > EDT (hr:min) with wave/clock icon. > Tank icon (Gas 1, 2, or 3). >...
  • Page 86 VGM Main (on surface), information includes (Fig. 88) - > Full NiBG and full O2BG, all segments flashing. > Surface Interval Time (hr:min) with clock/wave icon. > Graphics Vio and Nor alternating. > Tank (Gas 1) icon. > Dive number with # icon. >...

  • Page 87: High Po2

    HIGH PO2 When partial pressure of oxygen (PO2) increases to 0.20 (ATA) less than the PO2 Alarm value set*, the Audible will sound. *While in Deco, High PO2 will only alarm at 1.60. > The graphic PO2 and Up Arrow icon will be displayed flashing on the Main (Fig.

  • Page 88: High O2

    HIGH O2 The O2BG 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 Audible will sound during which the graphic O2 flashes in Fig.
  • Page 89 RESPONSIBLE COMPUTER DIVING • Plan each dive, and dive your plan. The ZEN AIR 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 90: Switching Gas Mixes And Trts

    SWITCHING GAS MIXES AND TRTS...

  • Page 91: Switching (Norm)

    SWITCHING (NORM) During NORM Dives, the ZEN AIR can be manually switched from Gas 1 to Gas 2 to Gas 3, changing FO2 displays and calculations, and if TRTs (Transmitters) are used, changing Pressure related displays and calculations from TRT 1 to TRT 2 to TRT 3. Switching from one Gas (and TRT) to another cannot be performed while on the surface.
  • Page 92 • M (2 sec) while viewing a Dive Main will access the Gas/ TRT 1 Switch Preview screen. • Operation will revert to the Dive Main after 10 seconds of no further M button action. Gas/TRT 1 Switch Preview, information includes (Fig. 92) - >...
  • Page 93 Gas/TRT 3 Switch Preview, information includes (Fig. 94) - > Graphics FO2 and - 3. > Tank 3 Pressure with PSI (or BAR) icon, if TRT3 is active. > FO2 Set Point for Gas 3. > Tank (Gas/TRT) 3 icon. •...

  • Page 94: Norm Post Dive Modes

    NORM POST DIVE MODES...

  • Page 95: Post Dive 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 displayed. 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 96: Post Dive 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 Watch Default Time. The NORM Surface Main screen can be then be accessed by depressing the M button 2 seconds.

  • Page 97: Uploading Settings And Downloading Data

    UPLOADING SETTINGS AND DOWNLOADING DATA The ZEN AIR is configured with a Data Port that enables it to be connected to a PC USB port using a special Interface Cable available as a separate option. A USB Driver is provided as part of the interface system, a separate option. The Settings Upload portion of the program can be used to set/change Main Time, Date, Set A group (Alarms), and Set U group (Utilities).

  • Page 98: Gauge Operating Mode

    NOTE: Once a dive is made in Digital Gauge Mode, you must wait 24 contiguous hours after surfacing before the ZEN AIR resets and will operate as an Air or Nitrox dive computer in NORM Mode or FREE Dive Mode. GAUGE OPERATING MODE...

  • Page 99: Gaug Surface Displays

    DIGITAL GAUGE MODE When Digital Gauge Mode (GAUG) is selected as the operating mode, the ZEN AIR will operate as a Digital Depth Gauge/Timer with Pressure and ATR without performing nitro- gen and oxygen calculations. • M (2) times (2 sec each time) while the Watch Default Time screen is displayed; or (1) time while the NORM Surface Main screen is displayed, will access Gauge Mode.

  • Page 100: Gaug Dive Displays

    Gauge Dive Main information includes (Fig. 99) - > Graphic GAU. > Tank Pressure with PSI (or BAR) and Tank (TRT 1, 2, or 3) icon, one in use. > Elapsed Dive Time (hr:min) with wave/clock icon. > Current Depth with FT (or M) icon. >...
  • Page 101 TRT 1 Switch Preview*, information includes (Fig. 101) - > Graphic - 1. > Tank 1 Pressure with PSI (or BAR) icon, if TRT1 is active. > Tank (TRT) 1 icon. • M (< 2 sec) to access the TRT 2 Switch Preview. •...

  • Page 102: Free Dive Operating Mode

    FREE DIVE OPERATING MODE...

  • Page 103: Free Surface Displays

    FREE DIVE MODE When Free Dive Mode is selected, 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. • M (3) times (2 sec each time) while the Watch Default Time screen is displayed; or (1) time while the GAUG Surface Main screen is displayed, will access Free Mode.
  • Page 104 Free Surface ALT 1, information includes (Fig. 104) - > Surface Interval prior to last dive (min:sec) with clock/wave icon. > Graphic LASt. > EDT (min:sec) of last dive with wave/clock icon. > Max Depth of last dive with MAX and FT (or M) icons. •...

  • Page 105: Free Countdown Timer (Cdt)

    FREE MODE COUNTDOWN TIMER (CDT) After accessing the Free CDT Status screen from the Free Surface Main screen, the CDT can be started, stopped, and set. The Status screen, displaying the graphics CDT and ON if run- ning with Countdown Time (min:sec) remaining (Fig. 106), or OFF flashing and the previously Countdown Time set, or OFF (solid) and 0:00 if no time was previously set.

  • Page 106: Set Cdt

    Once the CDT has been Set and Started (by selecting ON), it will continue to run in the background while on the surface until turned OFF (stopped) or the Time reaches 0:00 at which time the Alarm will strike, the graphic CDT will be displayed, and the Timer will revert to OFF.

  • Page 107: Free Edt Alarm

    • A (< 2 sec) will save the Seconds Set Point and revert to the CDT Status screen with the graphic OFF (flashing) in place of the graphic SEt (Fig. 109). • S (< 2 sec) will toggle from OFF to ON and Start the Timer. •...

  • Page 108: Free Depth Alarms (Da)

    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 Depth digits will flash.

  • Page 109: Free Dive Displays

    • S (hold) will scroll upward through the Depth Set Points from 30 to 330 FT (10 to 100 M) in increments of 10 FT (1 M) at a rate of 8 per second. • S (< 2 sec each time) will step upward through the Set Points one at a time.

  • Page 110: Free Dive Alarms

    • S (< 2 sec) to toggle ON/OFF (Start/Stop). • A (< 2 sec) to access ALT 2. • If no button is pressed during a period of 10 seconds, operation will revert to the Main. • L (press) to activate Backlight. Free Dive ALT 2, information includes (Fig.
  • Page 111 Free CDT Alarm When the Free CDT decreases to 0:00 (min:sec), 3 short beeps will sound 3 times during which the graphic CDT will flash (Fig. 115), then NDC will be restored. Free Depth Alarms When Depth reaches the Alarm 1 Set Point, 3 short beeps will sound 3 times during which the graphic DA1 will flash (Fig.
  • Page 112 Free NiBG Alarm While operating in Free Dive mode, residual Nitrogen remain- ing from the Free Dives and any previous NORM SCUBA Dives conducted within 24 hours is displayed as the NiBG. When Nitrogen loading increases to the Caution level, 3 short beeps will sound 3 times;...
  • Page 113 ADDITIONAL INFORMATION PERTAINING TO FREE DIVE MODE Although breathing apparatus is not utilized for FREE Dive activities, nitrogen tissue loading remains a factor. Nitrogen loading is calculated based upon a fixed FO2 of AIR. Since a user has the option of alternating between NORM (SCUBA) and FREE Dive activities within a 24 hour period, nitrogen calcu- lations and the displayed value of NDC Time are carried over from one operating mode to the other, which permits the user to maintain awareness of nitrogen absorption and off gasing status.

  • Page 114: Reference

    REFERENCE...

  • Page 115: Care And Cleaning

    INSPECTIONS AND SERVICE Your ZEN AIR should be inspected annually by an Authorized TUSA Dealer who will perform a factory prescribed function check and inspection for damage or wear. To keep the 2 year limited warranty in effect, this inspection must be completed one year after purchase (+/- 30 days).

  • Page 116: Zen Air Battery Replacement

    ZEN AIR, DO NOT attempt to use it for diving (NORM, GAUG, or FREE) until it receives proper factory service by TUSA. NOTE: When the old battery is removed, settings and calculations for repetitive dives will be retained in non volatile memory for subse- quent operations.

  • Page 117: Battery Removal

    CAUTION: Damage due to improper Battery replacement is not covered by the product's warranty. Battery Removal • Locate the Battery Compartment on the back of the unit. • Rotate the Battery Hatch clockwise 10 degrees using the Fig. 121 - BATTERY HATCH REMOVAL (Tool) special Battery Hatch Tool provided (Fig.

  • Page 118: Battery Installation

    WARNING: If damage or corrosion is found, return your ZEN AIR to an Authorized TUSA Dealer, and DO NOT attempt to use it until it has received factory prescribed service.
  • Page 119 Battery Hatch. Ensure that it is evenly seated (Fig. 125). NOTE: The Hatch O-ring must be a genuine TUSA part that can be purchased from an Autho- rized TUSA Dealer. Use of any other O-ring will Fig. 125 - HATCH O-RING void the warranty.

  • Page 120: Trt Battery Replacement

    • Inspect the Housingto ensure it is not cracked or damaged. WARNING: If damage or corrosion is found, re- turn your TRT to an Authorized TUSA Dealer, and DO NOT attempt to use it until it has received factory prescribed service.
  • Page 121 • Closely examine the inside of the Battery Compartment for any signs of corrosion indicating entrance of moisture. • If corrosion is found, return the TRT to an Authorized TUSA Dealer, and DO NOT attempt to use it until it has received factory service.

  • Page 122: Installing A Transmitter On A Regulator

    • Press the S button for 2 seconds to check the Status screens. • If a Low Battery Condition is indicated, return your ZEN AIR with TRT to an Authorized TUSA Dealer for a complete evaluation before attempting to use it.

  • Page 123: Transmitter Compatibility With Nitrox

    Authorized TUSA dealer for inspection and service. TRANSMITTER COMPATIBILITY WITH NITROX When packaged and shipped from the factory, TUSA ZEN AIR Transmitters are rated for use with compressed Air and/or nitrogen-oxygen (Nitrox) breathing gas mixtures containing up to...

  • Page 124: Altitude Sensing And Adjustment

    ALTITUDE SENSING AND ADJUSTMENT Prior to the first dive of a series of repetitive dives, Altitude (i.e., Ambient Pressure) is mea- sured upon activation of Dive Surface Mode and every 15 minutes until a dive is made or operation reverts to Watch Default Time. >...

  • Page 125: Chart Of Oxygen Exposure Limits

    When the Conservative Factor feature is set On, allowable dive times are calculated based upon the next higher 3,000 foot (915 meter) Altitude. All adjustments for Altitudes greater than 11,000 feet (3,355 meters) are then made to allowable dive times for 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.

  • Page 126: Charts Of No Decompression Limits At Altitude

    PZ+ ALGORITHM >> NDLS (HR:MIN) AT ALTITUDE (IMPERIAL) Altitude 3001 4001 5001 6001 7001 8001 9001 10001 11001 12001 13001 (feet) 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 Depth ( FT ) 30 3:17 2:30 2:21 2:14 2:08 2:02 1:57...

  • Page 127: 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 128 SPECIFICATIONS (CONTINUED) NUMERIC DISPLAYS: Range: Resolution: • Dive Number 0 to 24 • Depth (Current, Max) 0 to 330 FT (99.9 M) 1 FT (.1 M ) • Gas 1 FO2 Set Point Air, 21 to 50 % • Gas 2, 3 FO2 Set Point Air, 21 to 100 % •...
  • Page 129 SPECIFICATIONS (CONTINUED) BAR GRAPHS Nitrogen Bar Graph segments • No Deco Normal zone • No Deco Caution zone • Deco Warning zone Oxygen (O2) Bar Graph: segments • Normal zone • Caution zone • Danger zone Ascent Rate Indicator: 60 FT (18 M) & Shallower Deeper than 60 FT (18 M) segments segments...
  • Page 130 SPECIFICATIONS (CONTINUED) Altitude: • Operational from sea level to 14,000 feet (4,270 meters) elevation • Measures ambient pressure every 30 minutes in Watch Mode and when Dive Computer Mode is accessed, every 15 minutes while in NORM/GAUG/FREE Surface Modes. • Does not measure ambient pressure when Wet.
  • Page 131 SPECIFICATIONS (CONTINUED) • At extremely low temperatures, the LCD may become sluggish, but this will not affect it's accuracy. If stored or transported in extremely low temperature areas (below freezing), you should warm the unit and its battery with body heat before diving. Storage Temperature: •...
  • Page 132 • Connect the equipment to an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician. Warning: Changes or modifications to this unit not expressly approved by TUSA/2002 Design could void the user's authority to operate the equipment.

  • Page 133: Error During A Dive

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

  • Page 134: Inspection/ Service Record

    _________________________________ Transmitter #1 Serial Number: _________________________________ Transmitter #2 Serial Number: _________________________________ Transmitter #3 Serial Number: _________________________________ Date of Purchase: ____________ Purchased from: __________________________ Below to be filled in by an Authorized TUSA Dealer: Dat e Service Performed Dealer / Technician...

  • Page 135: Tusa International Contacts

    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...

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