10INTRODUCTIONWelcome to TUSA and thank you for choosing the ZEN ! It is extremely important that you read this Owner's Manual in sequence and u
100FREE DIVE MODEWhen Free Dive Mode is selected as the operating mode, the ZEN will operate with select features. Nitrogen loading is calculated bas
101• Press and release the A button momentarily (< 2 sec) to access the Free Surface ALT 1 screen, then again ALT 2.• Depress the A button for 2
102Free Surface ALT 2 information includes (Fig. 94) -> Temperature with degrees icon and graphic F (or C)> Time of Day with clock and AM (or
103• 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 be
104Set Free CDTUpon access, the Set CDT screen displays the graphics CDT and SEt and the CDT (min:sec) with clock icon, the Minute Set Point flashing (
105FREE 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
106FREE DIVE DEPTH ALARMS (DA) Free Dive mode features 3 Depth Alarms (DAs) that can be Set at progressively deeper Depths and turned OFF/ON. >
107• 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
108Free Dive Main information includes (Fig. 103) -> NiBG, if any Nitrogen remaining from NORM or FREE dives conducted within the previous 24 hour
109Free Dive ALT 2 information includes (Fig. 105) -> Time of Day with clock and AM (or PM) icons> Max Depth with MAX and FT (or M) icons>
11OPERATING MODE STRUCTUREUnless it is operating in Dive Computer mode, the ZEN will be ON in the default WATCH MAIN TIME (home time) mode (Fig. 1), l
110Free Depth AlarmsWhen Depth reaches the Free Depth Alarm 1 Set Point, 3 short beeps will sound 3 times during which the graphic DA1 will flash (Fig.
111When 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 gra
112Although breathing apparatus is not utilized for Free Dive activities, nitrogen tissue loading remains a factor. Nitrogen loading is calculated b
113REFERENCE
114CARE AND CLEANINGProtect your ZEN from shock, excessive temperatures, exposure to chemicals, and tamper-ing. Protect the lens against scratches w
115BATTERY REPLACEMENTNOTE: The procedures that follow must be closely adhered to. Dam-age due to improper Battery replacement is not covered by the
116Battery Removal• Locate the Battery Compartment on the back of the unit.• Rotate the Battery Hatch clockwise 10 degrees using the special Battery
117• Remove the Battery Hatch O-ring and inspect it for any signs of deterioration or deformity. DO NOT use tools to remove the O-ring.• To ensure
118NOTE: 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 void the w
119ALTITUDE SENSING AND ADJUSTMENTPrior to the first dive of a series of repetitive dives, Altitude (i.e., Ambient Pressure) is mea-sured upon activati
12OPERATION AS A DIVE COMPUTERThe ZEN features 3 Dive Computer (DC) Operating Modes, NORM (Fig. 2A) which is used for Air and Nitrox dives, GAUG (Fig.
120When the Conservative Factor feature is set ON, allowable dive times are calculated based upon the next higher 3,000 foot (915 meter) Altitude. Al
121PZ+ ALGORITHM >> NDLS (HR:MIN) AT ALTITUDE (IMPERIAL)Altitude 0 3001 4001 5001 6001 7001 8001 9001 10001 11001 12001 13001(feet)
122If 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 curre
123CAN BE USED AS• Watch• Air Computer • Nitrox Computer• Digital Depth Gauge/Timer• Free Dive Depth Gauge/TimerDIVE COMPUTER PERFORMANCE • Bu
124• Set U Group (Utilities): • Wet Activation (On/Off) >> On • Units of Measure (Imperial/Metric) >> Imperial • No Deco De
125Digital GAUG Dive Displays:• Main (default) - graphic GAU, Elapsed Dive Time, Current Depth, ASC• ALT - Temperature, Time of Day (hr:min), Max De
126SPECIFICATIONS (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• Chrono
127OPERATIONAL PERFORMANCEFunction: Accuracy:• Depth ±1% of full scale• Timers 1 second per dayDive Counter:• NORM/GAUG displays Dives #1 to 24
128Battery Indicator: • Warning - icon on solid at 2.75 volts, Battery change recommended• Alarm - icon on ashing at 2.50 volts, change the Batter
129RESPONSIBLE COMPUTER DIVING• Plan each dive, and dive your plan. The ZEN was not designed to make decisions for you, only to provide you with th
13FREE 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 b
130Tabata USA, Inc 2380 Mira Mar Avenue Long Beach, CA 90815 Tel: 562-498-3708 Fax: 562-498-0415 www.tusa.com [email protected] Ta
131INSPECTION / SERVICE RECORDZEN Serial Number: __________________________________________________ZEN Firmware Revision: ________________________
143 short beeps (which cannot be disabled) are emitted for the following -• NORM/GAUG Ascent Rate is 51 to 60 FPM (15.1 to 18 MPM) when deeper than 6
15NOTE: Extensive use of the Backlight reduces es-timated Battery life. Also, the Backlight does not operate during a Low Battery Condition or when
16PC INTERFACE Interface with a PC is accomplished by connecting the ZEN to a PC USB Port using a special USB Interface Cable available as an optiona
17WATCHFEATURES AND DISPLAYS
18LOCAL 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
19While 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
2LIMITED TWO-YEAR WARRANTYFor details, refer to the Product Warranty Registration Card provided. COPYRIGHT NOTICEThis manual is copyrighted, all right
20WATCH ALT DISPLAY, information includes (Fig. 9):> Altitude graphic (EL2 to EL7), if above 3000 feet (915 meters), blank if below.> Temperat
21Set Date FormatWhile viewing the Watch Default Time screen, depressing the A and S buttons simultaneously for 2 seconds will access the Set Date For
22Set TimeUpon 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 (
23• 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 sec
24ALTERNATE TIME• Pressing and releasing the M button momentarily (< 2 sec) while the Watch Default Time screen is displayed will access the Watch
25SET 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 (ho
26WATCH CDT (COUNTDOWN TIMER)Pressing and releasing the M button momentarily 2 times (< 2 sec each time) while the Watch Default Time screen is dis
27Set Watch CDTUpon 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
28CHRONOGRAPH (Stop Watch/Lap Timer) • Pressing and releasing the M button momentarily 3 times (< 2 sec each time) while the Watch Default Time sc
29• 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 mome
3CONTENTSWARRANTY, NOTICES, DECOMPRESSION MODEL ...2N
30• 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 t
31DIVE COMPUTERFEATURES AND DISPLAYS
32BAR GRAPHSThe ZEN features 3 Bar Graphs >> NiBG, O2BG, and ASC. NiBG (Nitrogen Loading Bar Graph)The NiBG (Fig. 22a) represents tissue loading
33Oxygen Bar Graph (O2BG)The O2BG (Fig. 23a) represents oxygen accumulation, showing the maximum of either per dive accumulated oxygen, or 24 hour per
34ALPHA/NUMERIC DISPLAYSEach numeric and graphic display represents a unique piece of information. It is imperative that you understand the formats,
35When Times are calculated projections such as NDC and Elapsed Dive Time (Fig. 26a/b), the colon is solid (non blinking). FREE Dive Mode displays Tim
36• It should not be considered that the capabilities built into the ZEN provide an implied approval or consent from TUSA for individuals to exceed t
37DIVE COMPUTER SURFACE MODES
38DIVE COMPUTER (DC) OPERATING MODESThe ZEN features 3 selectable DC Operating Modes -• NORM >> for Normal Air or Nitrox SCUBA dives• GAUG >
39At 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
4CONTENTS (continued)SURFACE MODE ...
40NORM SURF MAIN, information provided includes (Fig. 30):> Surface Interval Time (hr:min) with clock/wave icon> Graphic Nor > Tank 1 icon
41NORM SURF ALT, information includes (Fig. 31):> Altitude graphic (EL2 to EL7), if above 3000 feet (915 meters), blank if below.> Temperature
42SETTING FO2 FOR NITROX DIVESFor each value of FO2, the MOD (Max Operating Depth) that can be achieved for the PO2 Alarm limit previously set will b
43Internally, 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 div
44SET F GROUP (FO2)Sequence - Set F >> FO2 Gas 1 >> FO2 Gas 2 >> FO2 50% Default.> Depressing the A and S buttons simultaneousl
45• Pressing and releasing the S button momentarily and repeatedly (< 2 sec each time) will step upward through the Set Points one at a time.• Pr
46• Pressing and releasing the A button momentarily (< 2 sec) will save the setting and access Set FO2 50% Default.• Depressing the A and S butto
47SET A GROUPSequence - Set A >> Audible >> Depth >> EDT >> NiBG >> DTR >> PO2.> Depressing the A and S button
48• 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
49SET EDT ALARM information includes (Fig. 39):> Graphic EDT (meaning Elapsed Dive Time).> Set Point value (hr:min), flashing, with wave/clock
5CONTENTS (continued)FLY MODE ...
50Set NiBG Alarm information includes (Fig. 40):> Graphic NBG (meaning Nitrogen Bar Graph).> NiBG Set Point (segments), flashing. • Pressing a
51• Pressing and releasing the S button momentarily and repeatedly (< 2 sec each time) will step upward through the Set Points one at a time. • P
52SET U GROUP (UTILITIES)Sequence -SET U >> Wet Activation >> Units >> Deep Stop >> Safety Stop >> Conservative Factor &
53Set Units information includes (Fig. 45):> Set Point icons/graphics F and FT (or C and M), flashing. • Pressing and releasing the S button momen
54Set Safety Stop information includes (Fig. 47):> Graphic SAF (meaning Safety Stop).> Set Point ON or OFF, flashing, with STOP icon. • Press
55• 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
56Set Sampling Rate information includes (Fig. 50):> Graphic SR (meaning Sampling Rate).> Set Point (seconds value), flashing, with clock icon
57• 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
58Plan Lead-in information includes (Fig. 52):> Graphic FO2 with wave/clock/profile icons.> PO2 Alarm Set Point and graphic PO2, if FO2 is set
59Plan Depth/Time information includes (Fig. 53A/B:> NiBG (4 No Deco segments), or O2BG (4 segments), indicating which (Nitrogen or Oxygen) is in
6CONTENTS (continued)FREE DIVE OPERATING MODE ...
60• Pressing and releasing the A button momentarily 2 times (< 2 sec each time) while viewing the NORM Plan Lead-in screen, or the S button1 time
61When 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 acc
62NORM/GAUG LOG MODELog Mode displays information from the latest 24 NORM and/or GAUG dives sequen-tially in reverse order (the most recent first). Lo
63Log Preview information includes (Fig. 56):> Log (book) icon.> Graphic NOR (or GAU).> Dive Mode (wave/clock/profile) icon, if NORM.>
64> Max Depth with MAX and FT (or M) icons.> ASC representing max Ascent Rate recorded for 4 seconds.• Pressing and releasing the S button mo
65HISTORY MODEHistory Mode displays information for up to 999 NORM and/or GAUG Dives, 9999 Dive Hours, and the Maximum Depth achieved. History inform
66• Pressing and releasing the A button momentarily (< 2 sec) will revert to the NORM (or GAUG) Surface Main screen.• Depressing the M button fo
67NORM DIVE MODES
68NO 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 pr
69OXYGEN ACCUMULATIONIf FO2 was set for a numerical value (Nitrox), the O2BG (Fig. 62a) will add segments to represent oxygen accumulation for that di
7ZEN 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
70NORM NO DECOMPRESSION DIVE MODEWhen the Wet Activation feature is set ON, the ZEN will enter the NORM No Decompression Dive Mode any time you de-sce
71NORM 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
72No Deco Deep StopOn 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
73Press 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 AL
74No 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
75CAUTIONARY MODES
76DECOMPRESSION Decompression mode activates when theoretical No Decompression time and depth limits (NDLs) are exceeded. Upon Entry into Decompressi
77NOTE: Upon entry into Deco, the Deep Stop and Safety Stop features are disabled for the remainder of that dive, even when the Deco obli-gation is c
78CONDITIONAL VIOLATION (CV)If you ascend shallower than the calculated Deco Ceiling Depth, the Audible Alarm will sound and no off gassing credit wil
79NOTE: Upon entry into the following Violation modes, the Alarm will sound, even if Set OFF. When these events occur, the Alarm cannot be acknowle
8FULL LCDComponents:a. Mode (M) Buttonb. Icon - Log Modec. NiBG (Nitrogen Bar Graph)d. Icon - operating mode Surface Interval Plan NDC Time
80DELAYED VIOLATION #2 (DV2)If the Decompression obligation requires a Ceiling Depth be-tween 60 FT (18 M) and 70 FT (21 M), the full NiBG and TAT (To
81DELAYED 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
82VIOLATION GAUGE MODE (VGM)If calculations require a Deco Stop Depth greater than 70 FT (21 M), or if Deco is entered while operating in FREE Mode (d
83This 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 b
84HIGH PO2When 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
85Fig. 80A - NITROX DIVEHIGH O2 The O2BG (Fig. 80Aa) represents oxygen accumulated as a result of the repetitive Nitrox dives you have conducted duri
86• The percentage of oxygen (FO2) in the Nitrox mix being used must be 'set before each nitrox dive', unless the FO2 50% Default feature i
87SWITCHING GAS MIXES
88SWITCHING GAS MIXES (NORM only)During NORM Dives, the FO2 calculations/displays can be switched from Gas 1 to 2.> Switching Gas cannot be perfor
89To 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
9FEATURES AND DISPLAYS
90M2 secGAS 1PREVIEWM< 2 secGAS 2PREVIEWM< 2 secSwitches fromGas 1 to Gas 2(after 3 sec)Switches fromGas 2 to Gas 1(after 3 sec)Back to NORM DI
91NORM POST DIVE MODES
92POST DIVE FIRST 10 MINUTES ON SURFACEWhen you ascend to 2 FT (0.6 M) for 1 second, the Surface Main screen will be dis-played. If you descend durin
93POST DIVE AFTER 10 MINUTES ON SURFACEOnce 10 minutes have elapsed, the Surface Interval time colon will stop flashing indicating that the Dive and Tr
94UPLOADING SETTINGS AND DOWNLOADING DATAThe ZEN is configured with a Data Port located on the back of the left side that enables it to be connected to
95GAUGE OPERATING MODE
96DIGITAL GAUGE MODEWhen Digital Gauge Mode (GAUG) is selected as the operating mode, the ZEN will oper-ate as a Digital Depth Gauge/Timer without per
97• Press and release the A button momentarily (< 2 sec) to access Log, then again to access History.• Depress the A button for 2 seconds to the
98Gauge Dive ALT information includes (Fig. 90) -> Temperature with degrees icon and graphic F (or C)> Time of Day (hr:min) with clock and AM (o
99FREE DIVE OPERATING MODE
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