Bism GRANDE User manual

BISM
GRANDE
Watch Dive Computer
Operating Manual

2
FULL LCD
Components:
a. Mode (M) Button
b. Select (S) Button
c. Light, Log (L) Button
d. Advance (A) Button
e. LED Warning Light
f. Bar Graph
g. Icon - Log Mode
h. Icon - Ascend
i. Icon - Surface Interval
O2 Time Remaining
No Deco Time Remaining
Total Ascent Time
FO2 Set Point
j. Icon - Degrees
k. Icon - Stop Time Required
Elapsed Dive Time
l. Icon - PO2
m. Icon - Nitrox
n. Icon - Daily Alarm set
o. Icon - Low Battery
p Icon - Depth/Max Depth
q. Icon - Descend
b
c
d
e
g
h
j
k
l
q
o
m
i
p
a
f
n

3
CONTENTS
FULL LCD .................................................................................................................................................................2
NOTICES, DECOMPRESSION MODEL...................................................................................................................7
INITIAL ACTIVATION................................................................................................................................................8
INTRODUCTION AND GENERAL FEATURES AND DISPLAYS ............................................................................9
INTERACTIVE CONTROL CONSOLE ...............................................................................................................10
OPERATING MODE STRUCTURE .................................................................................................................... 11
OPERATION AS A DIVE COMPUTER ...............................................................................................................12
PC INTERFACE ..................................................................................................................................................12
SYMBOLS AND ALPHA NUMERIC GRAPHICS ...............................................................................................13
AUDIBLE ALARM...............................................................................................................................................13
BACKLIGHT .......................................................................................................................................................15
POWER SUPPLY................................................................................................................................................16
WATCH FEATURES AND DISPLAYS ....................................................................................................................17
LOCAL DEFAULT TIME .....................................................................................................................................18
MAIN TIME..........................................................................................................................................................19
SET MAIN TIME ..............................................................................................................................................20
ALTERNATE TIME..............................................................................................................................................23
SET ALTERNATE TIME...................................................................................................................................24
COUNTDOWN TIMER ........................................................................................................................................24
SET COUNTDOWN TIMER ............................................................................................................................25
CHRONOGRAPH................................................................................................................................................26
DAILY ALARM ....................................................................................................................................................28
SET DAILY ALARM .........................................................................................................................................29
DIVE COMPUTER FEATURES AND DISPLAYS ...................................................................................................31
BAR GRAPH.......................................................................................................................................................32
ALPHA / NUMERIC DISPLAYS.........................................................................................................................34
Depth Displays ................................................................................................................................................34
Time and Date Displays...................................................................................................................................34
Temperature Display........................................................................................................................................35

4
CONTENTS (continued)
DIVE COMPUTER SURFACE SEQUENCE AND OPERATING MODES .............................................................. 37
DC OPERATING MODES ...................................................................................................................................38
SURFACE MODE................................................................................................................................................38
NORM Surface Mode ......................................................................................................................................40
NORM/GAUG SET MODES................................................................................................................................42
Set F Group (FO2) ...................................................................................................................................42
Setting FO2 .....................................................................................................................................................44
Set FO2 50% Default.......................................................................................................................................45
Set A Group (Alarms) .............................................................................................................................46
Set Audible Alarm ............................................................................................................................................46
Set Depth Alarm ..............................................................................................................................................47
Set EDT (Elapsed Dive Time) Alarm ...............................................................................................................47
Set NIBG (Nitrogen Bar Graph) Alarm.............................................................................................................48
Set DTR (Dive Time Remaining) Alarm ...........................................................................................................48
Set PO2 Alarm.................................................................................................................................................49
Set U Group (Utilities) ............................................................................................................................50
Set Wet Activation ...........................................................................................................................................50
Set Units..........................................................................................................................................................51
Set Deep Stop .................................................................................................................................................51
Set Safety Stop................................................................................................................................................52
Set Conservative Factor..................................................................................................................................53
Set Backlight Duration.....................................................................................................................................53
Set Sampling Rate...........................................................................................................................................54
SERIAL NUMBER ....................................................................................................................................54
PLAN Mode ..............................................................................................................................................55
FLY Mode .................................................................................................................................................57
DESAT Mode ...........................................................................................................................................58
LOG Mode ...............................................................................................................................................59
HISTORY Mode .......................................................................................................................................64
DISPLAYED SYMBOLS AND ICONS.............................................................................................................66

5
CONTENTS (continued)
OVERVIEW OF DIVE MODE INFORMATION........................................................................................................67
DIVE TIME REMAINING (DTR) ..........................................................................................................................68
No Decompression DTR (NDC) ......................................................................................................................68
O2 DTR (OTR) ................................................................................................................................................69
VARIABLE ASCENT RATE ................................................................................................................................70
ELAPSED DIVE TIME (EDT) ..............................................................................................................................71
CONTROL OF DISPLAYS ..................................................................................................................................71
WET ACTIVATION CONTACTS..........................................................................................................................72
NORM TYPE DIVE MODES....................................................................................................................................73
NORM NO DECOMPRESSION DIVE MODE .....................................................................................................74
No Deco Deep Stop.........................................................................................................................................76
No Deco Safety Stop.......................................................................................................................................78
DECOMPRESSION DIVE MODE .......................................................................................................................79
VIOLATION MODES ...........................................................................................................................................81
Conditional Violation........................................................................................................................................81
Delayed Violation 1..........................................................................................................................................82
Delayed Violation 2..........................................................................................................................................82
Delayed Violation 3..........................................................................................................................................83
Violation Gauge Mode.....................................................................................................................................83
HIGH PO2 ...........................................................................................................................................................85
HIGH OXYGEN ACCUMULATION .....................................................................................................................86
NORM POST DIVE MODES ...................................................................................................................................87
TRANSITION PERIOD........................................................................................................................................88
AFTER THE TRANSITION PERIOD...................................................................................................................89
SUMMARY OF WARNING AND ALARM MESSAGES......................................................................................90
GAUGE OPERATING MODE .................................................................................................................................91
GAUGE MODE....................................................................................................................................................92

6
CONTENTS (continued)
FREE DIVE OPERATING MODE............................................................................................................................95
FREE Surface Mode........................................................................................................................................96
FREE CDT (COUNTDOWN TIMER)...................................................................................................................98
Set FREE CDT ................................................................................................................................................99
FREE EDT (ELAPSED DIVE TIME) ALARM....................................................................................................100
Set FREE EDT Alarm ....................................................................................................................................100
FREE DEPTH ALARMS (FDA).........................................................................................................................101
Set FDA1.......................................................................................................................................................101
Set FDA2.......................................................................................................................................................102
Set FDA3.......................................................................................................................................................103
FREE DIVE MODE............................................................................................................................................104
FREE Dive CDT ............................................................................................................................................104
FREE Dive Alarms.........................................................................................................................................105
REFERENCE ........................................................................................................................................................107
CARE AND CLEANING....................................................................................................................................108
INSPECTIONS AND SERVICE.........................................................................................................................108
BATTERY REPLACEMENT..............................................................................................................................109
UPLOADING SETTINGS AND DOWNLOADING DATA.................................................................................. 114
PC Compatibility Requirements..................................................................................................................... 115
ERROR (RESET DURING A DIVE) .................................................................................................................. 115
ALTITUDE SENSING AND ADJUSTMENT...................................................................................................... 116
No Decompression Limits at Altitude............................................................................................................. 117
OXYGEN EXPOSURE LIMITS ......................................................................................................................... 118
SPECIFICATIONS............................................................................................................................................. 119
INSPECTION / SERVICE RECORD .................................................................................................................124
Pay special attention to items marked
with this Warning symbol.

7
COPYRIGHT NOTICE
This operating manual is copyrighted, all rights are reserved. It may not, in whole or in part, be
copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine
readable form without prior consent in writing from Bism/2002 Design.
Grande Operating Manual, Doc. No. 12-5308
© 2002 Design, 2012
San Leandro, CA USA 94577
TRADEMARK, TRADE NAME, AND SERVICE MARK NOTICE
Bism, the Bism logotype, Grande, the Grande logo are all trademarks, trade names, or service
marks of Bism. 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 Meter (U.S.
Patent no. 5,156,055), other patents pending.
DECOMPRESSION MODEL
The programs within the Grande simulate 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 Grande dive computer model is based upon the latest research and experi-
ments in decompression theory. Still, using the Grande, just as using the U.S. Navy
(or other) No Decompression Tables, is no guarantee of avoiding decompression
sickness, i.e. “the bends.” Every diver’s physiology is dierent, and can even vary from
day to day. No machine can predict how your body will react to a particular dive prole.

8
Grande 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. However,
they are not displayed. Upon waking the Grande up, the correct Date and factory
Time will be displayed and it will be ready to operate with full functions.
To wake the Grande 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 Grande is brought out of the Deep Sleep
mode, it can only be placed back in it by the factory.
NOTICE
STORAGE and INITIAL ACTIVATION

9
INTRODUCTION
AND
GENERAL FEATURES AND DISPLAYS

10
INTRODUCTION
Welcome to Bism and thank you for choosing the Grande !
It is extremely important that you read this Operating Manual in sequence and
understand it completely before attempting to use the Grande as a dive computer.
Remember that technology is no substitute for common sense, and a dive computer
only provides the person using it with data, not the knowledge to use it.
INTERACTIVE CONTROL CONSOLE
The Interactive Control Console consists of four Control Buttons that allow you to
select mode options and access specic information. They are also used to enter
Settings, access Log and History modes, activate the Backlight, and acknowledge
the Audible Alarm.
Throughout this manual they will be referred to as the M, S, L, and A buttons.
• Upper/Left - Mode (M) button
• Upper/Right - Select (S) button
• Lower/Right - Light, Log (L) button
• Lower/Left - Advance (A) button M
A
S
L

11
OPERATING MODE STRUCTURE
Unless it is operating in Dive Computer mode, the Grande will
be ON in the default WATCH MAIN TIME (home time) mode
(Fig. 1), like a standard WATCH, until the Mode is changed.
The M button is used to access 4 other Modes that include
Alternate Time Mode, Countdown Timer, ChronoGraph (stop
watch/lap timer), and Daily Alarm. It is also used to revert to
the Local Default Time display and access Computer Modes.
The screens of the Main Modes and Sub Modes will remain
on display until a button is pressed to access another screen
or Mode, activate a sequence, or for 2 minutes if no button is
pressed. The ChronoGraph remains on display as long as it is
running unless another Mode is accessed.
When Wet Activation is set On, the Grande will enter selected
Dive Mode upon descent to 5 FT (feet)/1.5 M (meters) for 5
seconds, regardless of what operating Mode it is in.
WARNING: When Wet Activation is set OFF,
the Grande must be in Dive Surface Mode
(NORM< GAUG, or FREE prior to the rst dive
of a new series. Commencing a dive while in
Watch modes will not activate Dive Mode un-
less Wet Activation is set ON.
Main Sequence
(while at home)
Main Time
Alternate Time
Countdown Timer
ChronoGraph
Daily Alarm
Alternate Sequence
(at a travel location)
Alternate Time
Main Time (home)
Countdown Timer
ChronoGraph
Daily Alarm
Fig. 1 - MAIN TIME

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OPERATION AS A DIVE COMPUTER
The Grande 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.
Entering Settings and Plan Mode are only available in NORM
SURF Mode which also allows access to Fly, Desat, Log, and
History Modes.
GAUG Mode only allows access to Fly, Log, and History
Modes.
Once a dive is made in GAUG Operating Mode, the Grande
is locked into that Mode for 24 hours after the dive.
PC INTERFACE
Interface with a PC is accomplished by connecting the Grande
to a PC USB Port using the Bism PC Interface USB cable. The
same Cable is used for Upload and Download.
The software program is on the Bism CD, together with a USB
Driver. The program's Help serves as the user manual and can
be printed for personal use. The Settings Upload program is
used to check the Grande's existing Settings and for entering
Time, Alarm, and Dive Computer settings into the Grande.
Fig. 2 - DC MODES
A
B
C

13
The Data Download program is used to retrieve Data that was sampled during
dives and stored in the Grande's memory.
The Grande checks for an External Access request once every second while in the
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 Grande's Data Port and plugged
into a PC USB Port. To establish the connection, the PC program must be running.
When the connection is made, all segments of the LCD appear on the display until
completion of the Upload or Download operation.
• The Grande reverts to the Watch Main Time screen after completion of the
Upload or Download operation, or after 2 minutes if no PC action was taken.
SYMBOLS AND ALPHA NUMERIC GRAPHICS
The upper line of digits on the LCD screen is used to convey alpha Messages such
as Day of the Week, Operating Modes, items being Set, Altitude level, and Alarm
identication. At times, the second line is also used to display alpha numeric
Graphics such as FO2 and On/O. The PO2 values will appear in the lower
line.
AUDIBLE ALARM
Most warning situations that activate the Audible Alarm while operating in NORM
or GAUG Mode cause the Grande to emit 1 beep per second for 10 seconds, or
until the situation is corrected, or it is acknowledged by momentarily pressing and
releasing the S button (less than 2 seconds).
After being acknowledged and the situation corrected, the Alarm will sound again
upon reentry into the warning situation, or entry into another warning situation.

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 O.
An LED Warning Light, located on the side of the housing, is synchronized with the
Audible Alarm. It will ash as the Audible Alarm sounds. It will turn O when the
Alarm is acknowledged or the situation is corrected. The Audible and LED 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 -
• Descent deeper than the Max Depth Set Point selected.
• Dive Time Remaining at the Set Point selected.
• Elapsed Dive Time at the Set Point selected.
• High PO2 at the Set Point selected.
• High O2 of 300 OTU (single or daily exposure).
• Nitrogen Bar Graph at the segment Set Point selected.
• NORM/GAUG Ascent Rate exceeds 60 FPM (18 MPM) when deeper than
60 FT (18 M), or 30 FPM (9 MPM) at 60 FT (18 M) and shallower.
• Entry into Decompression Mode (Deco).
• Conditional Violation (above a required Deco Stop Depth for less than 5
minutes).
• Delayed Violation (above a required Deco Stop Depth for more than 5
minutes).
• Delayed Violation (a Deco Stop Depth greater than 60 FT/18 M is required).
• Delayed Violation (Max Operating Depth of 330 FT/100 M is exceeded).
• Watch Daily Alarm reaches time set (disabled during Dive Modes).
• Watch Mode Countdown Timer reaches 0:00.

15
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 -
• NORM/GAUG Ascent Rate is 51 to 60 FPM (15.1 to 18 MPM) when deeper
than 60 FT (18 M), or 26 to 30 FPM (7.5 to 9 MPM) at 60 FT (18 M) and
shallower.
• FREE Elapsed Dive Time Alarm (3 beeps every 30 seconds if set On).
• FREE Depth Alarms 1/2/3 (set sequentially deeper) - each 3 beeps 3 times.
• FREE NIBG Alarm (Caution zone, 4 segments) - 3 beeps 3 times.
• Entry into Deco during a FREE Dive (Permanent Violation) - 3 beeps 3 times.
• Free Dive Mode Countdown Timer reaches 0:00 - each 3 beeps 3 times.
During the following NORM Dive situations, the 10 second continuous tone will be
followed by a 5 second steady beep that will not turn o when acknowledged -
• Ascending above a required Decompression Ceiling Stop Depth for more than
5 minutes (referred to as a Delayed Violation).
• Decompression requires a Ceiling Stop Depth of 70 FT (21 M) or deeper.
• Being on the Surface for 5 minutes after a Conditional Violation (Permanent
Violation).
BACKLIGHT
To activate the Backlight - depress the L button for 2 seconds.
• The Backlight will then activate and illuminate the display for button
depression time, then upon release the added Duration time set (0, 5, or 10
additional seconds), for a maximum illumination time of 20 seconds.
• Depress the L button again to activate as desired.

16
NOTE: Extensive use of the Backlight reduces
estimated Battery life. Also, the Backlight
does not operate during a Low Battery Condi-
tion or when the Grande is connected to a PC.
POWER SUPPLY
The Grande utilizes one 3 volt CR2430 Lithium Battery. When
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. The Grande checks its battery voltage every
2 minutes during surface operation.
• If voltage decreases to the Warning level (2.75 volts), the
Battery icon will appear on Surface display screens (Fig.
3a) as an indication that the Battery should be changed
prior to commencing a series of dives.
• If voltage decreases to the Alarm level (2.50 volts), the
Battery icon will ash and the message CHNG > BATT
will scroll at the top of the display (Fig. 4). Operation will
automatically revert to Main Time Mode. The Grande
would then only operate in Watch modes until the Battery
becomes completely depleted.
• Low Battery Warning/Alarm conditions are not displayed
during Dive Modes.
• If a Low Battery condition was not displayed prior to
starting a dive, and a Low Battery condition occurs during
the dive, there will be sucient Battery power to maintain
operation for the remainder of that dive.
Fig. 4 - LOW BATTERY
ALARM
Fig. 3 - LOW BATTERY
WARNING
a

17
WATCH
FEATURES AND DISPLAYS

18
LOCAL DEFAULT TIME
Watch Main Time (Fig. 5) 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 >>> Alternate Time > Countdown Timer >
ChronoGraph > Daily Alarm.
Watch Alternate Time (Fig. 6), which is set by Hour Dif-
ferential, is the current Time at a remote travel location. Upon
arrival at the location, Alternate Time can be interchanged with
Main Time to make it the Local Default Time while visiting the
travel location.
The M button will then access the screens in this sequence -
Alternate Time >>> Main Time > Countdown Timer >
ChronoGraph > Daily Alarm.
While viewing Alternate Time, depressing the S button for 2
seconds will replace Main Time with Alternate Time that will
then become the Local Default Time until changed.
Fig. 5 - MAIN TIME
Fig. 6 - ALTERNATE
TIME
Time for the remote
location will display
Am (or Pm). Local
default Time will not.

19
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 Time screen selected
to be the Local Default Watch Time (Main or Alternate).
MAIN TIME, information includes (Fig. 7):
> Nitrogen Bar Graph, if any after NORM/FREE dives.
> Alarm icon, if the Daily Alarm is set On (Fig. 7a).
> Day of the Week Graphic MON (or TUE, WED, THU, FRI,
SAT, SUN), or the Graphic WET (if the unit is wet).
> Battery icon, if a Low Battery condition exists.
> Month and Day.
> Time of Day (hours, minutes, seconds) (Fig. 7b).
• Pressing M repeatedly (< 2 seconds each time) will step
through the Main Watch mode screens.
• Depressing M (2 seconds) will access the DC (dive
computer) NORM Surface Main screen.
• Pressing S (< 2 seconds) will silence and acknowledge the
Daily Alarm (if set On and it sounds).
• Pressing L (< 2 seconds) will access the Log and History
screens.
• Depressing L (2 seconds) will activate the Backlight.
• Depressing both A and S for 2 seconds will access the Set
Time screens.
• Depressing A for 2 seconds will access the Secondary
screen (Temperature, Day).
Fig. 7 - MAIN TIME
(May 31)
a
b

20
SET MAIN TIME
This Mode allows the Date and Time of Day to be set which will
also serve as the basis for Alternate Time values.
There are 3 Time Set screens >> Set Hour Format, Set Time of
Day, and Set Date.
NOTE: Main Time must be selected as the Local
Default Time in order to set the Time and Date.
Sequence of Time/Date settings:
Hour Format > Hour > Minute > Year > Month > Day.
Day of the Week is set automatically when the Date is set.
• Depressing M (2 seconds) at any time, or if no button is
pressed during a period of 2 minutes, operation will revert
to the Watch Main Time screen.
While the Main screen is being displayed, depressing A and
S (2 seconds) will access Set Hour Format with the Graphic
HOUR, symbol TIME, and the Hour Format Set Point ashing
(Fig. 8).
• Pressing S (< 2 seconds) will toggle between 12 and 24.
• Pressing A (< 2 seconds) will save the setting and access
Set Time with the Hour digits ashing.
Fig. 8 - SET HOUR
FORMAT