Tusa ZEN User manual

DIVE COMPUTER
Owner’s Manual
© 2002 Design, 2008. All rights reserved.
Doc. No.12-2931-r01 (9/15/08)
TUSA QUALITYTUSA QUALITY
Worldwide Contacts:
Tabata USA, Inc. www.tusa.com
Tabata Australia Pty Ltd. www.tusa.com.au
Tabata Europe Corporation B.V. www.tusa.nl
Tabata Mfg. Co. Ltd. www.tusa.net
Tabata Co. Ltd. Japan. www.tusa.net
®

Information that follows amends that presented in the
ZEN Owner's Manual, Doc. No. 12-2931-r01.
PC INTERFACE
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.
The items are not supplied with the ZEN dive computer.
ZEN
Owner's Manual Addendum
©2002 Design, 2009 Doc. No. 12-2999-r01 (7/28/09)

2
LIMITED TWO-YEAR WARRANTY
For details, refer to the Product Warranty Registration Card provided.
COPYRIGHT NOTICE
This manual is copyrighted, all rights are reserved. It may not, in whole or in part, be copied, photocopied, repro-
duced, translated, or reduced to any electronic medium or machine readable form without prior consent in writing from
Tabata USA, Inc. and Tabata Corp. Ltd. / 2002 Design.
ZEN Owner's Manual, Doc. No. 12-2931
© 2002 Design, 2009
San Leandro, CA USA 94577
TRADEMARK NOTICE
TUSA, the TUSA logo, ZEN, and the ZEN logo, are all registered and unregistered trademarks of Tabata USA and
Tabata Corp. Ltd. All rights are reserved.
PATENT NOTICE
U.S. Patents have been issued, or applied for, to protect the following design features:
Data Sensing and Processing Device (U.S. Patent no. 4,882,678), Ascent Rate Indicator (U.S. Patent no. 5,156,055).
CE
The CE mark is used to mark conformity with the European Union EMC directive 89/336/EEC. TUSA dive instruments
fulfill the required EU directives.
EN 13319 "Diving accessories - Depth gauges and combined depth and time measuring devices - Functional and
safety requirements, test methods" is a European diving depth gauge standard. The ZEN is designed to comply with
this standard.
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. Still, using the ZEN, just as using the
Navy (or other) No Decompression Tables, is no guarantee of avoiding decompression sickness, i.e.
“the bends.” Every diver’s physiology is different, and can even vary from day to day. No machine can predict how
your body will react to a particular dive profile.

3
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 ...................................................................................................................................................... 12
BACKLIGHT .............................................................................................................................................................. 14
POWER SUPPLY ...................................................................................................................................................... 15
PC INTERFACE ......................................................................................................................................................... 16
WATCH FEATURES AND DISPLAYS ............................................................................................................................ 17
LOCAL DEFAULT TIME ............................................................................................................................................ 18
MAIN TIME................................................................................................................................................................. 19
WATCH ALT DISPLAY ............................................................................................................................................... 20
SET MAIN TIME......................................................................................................................................................... 20
ALTERNATE TIME ..................................................................................................................................................... 24
SET WATCH ALTERNATE TIME ............................................................................................................................... 25
WATCH CDT (COUNTDOWN TIMER) ...................................................................................................................... 26
SET WATCH CDT ...................................................................................................................................................... 27
CHRONOGRAPH ...................................................................................................................................................... 28
DAILY ALARM ........................................................................................................................................................... 29
SET DAILY ALARM .................................................................................................................................................... 30
DIVE COMPUTER FEATURES AND DISPLAYS ........................................................................................................... 31
BAR GRAPHS ........................................................................................................................................................... 32
ALPHA / NUMERIC DISPLAYS................................................................................................................................ 34

4
CONTENTS (continued)
DIVE COMPUTER SURFACE MODES .......................................................................................................................... 37
SURFACE MODE ...................................................................................................................................................... 38
NORM SURF MAIN .............................................................................................................................................. 40
NORM SURFALT ................................................................................................................................................. 41
NORM/GAUGE SET MODES .................................................................................................................................... 41
Set FO2 for NORM Nitrox Dives .......................................................................................................................... 42
SET F GROUP (FO2) ................................................................................................................................................ 44
Set FO2 GAS 1..................................................................................................................................................... 44
Set FO2 GAS 2..................................................................................................................................................... 45
Set FO2 50% Default ........................................................................................................................................... 46
SET A GROUP (NORM/GAUG ALARMS) ................................................................................................................ 47
Set Audible Alarm ................................................................................................................................................. 47
Set Depth Alarm ................................................................................................................................................... 48
Set EDT (Elapsed Dive Time) Alarm ................................................................................................................... 49
Set NiBG (Tissue Loading Bar Graph)Alarm....................................................................................................... 50
Set DTR (Dive Time Remaining) Alarm................................................................................................................ 50
Set PO2 Alarm ...................................................................................................................................................... 51
SET U GROUP (UTILITIES) ...................................................................................................................................... 52
Set Wet Activation ................................................................................................................................................ 52
Set Units of Measure ............................................................................................................................................ 53
Set Deep Stop ...................................................................................................................................................... 53
Set Safety Stop ..................................................................................................................................................... 54
Set Conservative Factor ....................................................................................................................................... 54
Set Backlight Duration .......................................................................................................................................... 55
Set Sampling Rate................................................................................................................................................ 56
SERIAL NUMBER ..................................................................................................................................................... 56

5
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) .......................................................................................................................... 69
NORM NO DECO DIVE MODE ................................................................................................................................. 70
No Deco Deep Stop .............................................................................................................................................. 72
No Deco Safety Stop ............................................................................................................................................ 74
CAUTIONARY MODES ................................................................................................................................................... 75
DECOMPRESSION ................................................................................................................................................... 76
CONDITIONAL VIOLATION ...................................................................................................................................... 78
DELAYED VIOLATION 1 ........................................................................................................................................... 79
DELAYED VIOLATION 2 ........................................................................................................................................... 80
DELAYED VIOLATION 3 ........................................................................................................................................... 81
VIOLATION GAUGE MODE ...................................................................................................................................... 82
HIGH PO2 .................................................................................................................................................................. 84
HIGH O2 .................................................................................................................................................................... 85
SWITCHING GAS MIXES ............................................................................................................................................... 87
NORM POST DIVE MODES ........................................................................................................................................... 91
FIRST 10 MINUTES ON SURFACE .......................................................................................................................... 92
AFTER 10 MINUTES ON SURFACE ........................................................................................................................ 93
UPLOADING SETTINGS AND DOWNLOADING DATA .......................................................................................... 94

6
CONTENTS (continued)
GAUGE OPERATING MODE ......................................................................................................................................... 95
DIGITAL GAUGE MODE ........................................................................................................................................... 96
FREE DIVE OPERATING MODE ................................................................................................................................... 99
FREE SURFACE MAINANDALT ............................................................................................................................ 100
FREE COUNTDOWN TIMER (CDT) ....................................................................................................................... 102
SET FREE CDT ....................................................................................................................................................... 103
FREE ELAPSED DIVE TIME (EDT) ALARM .......................................................................................................... 105
SET FREE EDT ALARM .......................................................................................................................................... 105
FREE DEPTH ALARMS (DAs) ................................................................................................................................ 106
SET FREE DAs ........................................................................................................................................................ 106
FREE DIVE MAIN ANDALTs ................................................................................................................................... 108
FREE DIVE ALARMS .............................................................................................................................................. 109
REFERENCE................................................................................................................................................................. 113
CARE AND CLEANING ........................................................................................................................................... 114
INSPECTIONS AND SERVICE ............................................................................................................................... 114
BATTERY REPLACEMENT .................................................................................................................................... 115
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

7
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.
In this mode, Date and Time are updated as they normally would be. However,
they are not displayed. Upon waking the ZEN up, the correct Date and USA
Pacific Time will be displayed and it will be ready to operate with full functions.
To wake the ZEN up from Deep Sleep mode, simultaneously depress the upper/
right (S) and lower/left (A) buttons for 2 to 3 seconds until the display comes full
ON displaying the MAIN TIME screen, then release them.
NOTE: Once the ZEN is brought out of the Deep Sleep mode,
it can only be placed back in it by the factory.
NOTICE
STORAGE and INITIAL ACTIVATION

8
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. Icon - Stop Time Required
Elapsed Dive Time
h. Icon - Time of Day
i. Icon - Ascend
j. Light (L) Button
k. Icon - Depth/Max Depth
l. ASC (Ascent Rate Indicator)
m. Icon - Low Battery
n. Icon - Stop (Deep, Safety, Deco)
o. Icon - Dive #
p. Icon - Depth
q. Icon - Gas (mix)
r. Advance (A) Button
s. Icon - Descend
t. Icon - Max
u. Icon - Degrees
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9
FEATURES AND DISPLAYS