Seiko DH33 User Manual

Cal. DH33

INSTRUCTIONS (P. 2)
BEDIENUNGSANLEITUNG (S. 30)
INSTRUCTIONS (P. 58)
ISTRUZIONI (P. 86)

You are now the proud owner of a SEIKO Diving Computer
Cal. DH33. For best results, please read the instructions in this
booklet carefully before using your SEIKO Diving Computer.
Please keep this manual handy for ready reference.

Sie sind jetzt stolzer Besitzer eines SEIKO Tauchcomputers Kal.
DH33. Lesen Sie diese Bedienungsanleitung vor der Verwendung
Ihres SEIKO Tauchcomputers aufmerksam durch, um seine
optimale Nutzung zu gewährleisten. Heben Sie diese
Bedienungsanleitung gut auf, um jederzeit wieder nachlesen zu
können.

Vous voici l’heureux propriétaire d’un Ordinateur de Plongée
SEIKO Cal. DH33. Pour en obtenir d’excellentes performances,
veuillez lire attentivement les explications de ce livret avant d’utiliser
cet appareil SEIKO. Conservez cette brochure de manière à pouvoir
la consulter au besoin.

Grazie per aver acquistato questo orologio computer per
immersioni, SEIKO Cal. DH33. Per ottenere i migliori risultati
leggere attentamente le istruzioni di questo libretto prima di
passare all’uso del computer stesso. Tenere poi il manuale a
portata di mano, per ogni eventuale futura, ulteriore consultazione.

INSTRUCCIONES (P. 118)
INSTRUÇÕES (P. 146)
 ! (174 )

Usted es ahora un orgulloso propietario de un Ordenador de
Buceo Cal. DH33 SEIKO. Para los mejores resultados, por favor,
lea cuidadosamente las instrucciones de este librillo antes de
utilizar su Ordenador de Buceo Cal. DH33 SEIKO. Le rogamos que
guarde este conveniente manual para pronta referencia.

Você pode sentir-se orgulhoso de ter adquirido um SEIKO
Computador de Mergulho Cal. DH33. Para obter dele os resultados
máximos, solicitamos-lhe que, antes de usar o seu SEIKO
Computador de Mergulho, leia atentamente as instruções contidas
neste opúsculo. E guarde este manual para referências futuras.

English

ENGLISH

WARNING

The SEIKO Diving Computer Cal. DH33 is
intended for use in an inherently hazardous
form of recreation. Therefore, it is absolutely
essential that you strictly observe all
instructions for the use and maintenance of
the watch set forth in this manual.

First of all, this watch is for use in recreational
(no-decompression) diving in water having
a temperature range -5° C to +40° C (+23° F
to +104° F) only by adults in good health and
having average physical strength. It is not
suitable for use in saturation diving using
helium gas.

The watch uses an algorithm developed by
Mr. Randy Bohrer, one of the most
distinguished scientists in this field, which
expands upon the theories of the so-called
Swiss model. Unless you have undergone
scuba training with a qualified instructor,
you can neither fully appreciate the concept
of those theories and the nature of hazards
you may face while diving, nor properly
understand the meanings of indications and
warnings the watch provides.

The watch also provides data for Nitrox
diving. Do not use the watch for Nitrox

2

diving unless you are specially qualified to
dive with Nitrox, having full knowledge of the
potential hazards of Nitrox diving. It is
extremely hazardous to dive using the watch if
it is set for the wrong percentage of oxygen

2). You should check before every dive if the

(FO
FO

2 value set for the watch corresponds exactly

to the actual percentage of oxygen in your
scuba tank.

Anticipating emergencies, the watch provides
information for decompression diving. De­compression diving can be quite hazardous,
however, and you should not make de­compression dives.

Do not attempt to dive using the watch unless
you have been properly trained in scuba diving,
possess the requisite experience and skill to
dive safely, have thoroughly familiarized
yourself with the operation and maintenance
of the watch, and have tested all watch functions
prior to each dive.

In addition, sharp fluctuations in atmospheric
pressure and aquatic environments may affect
the performance of the watch. The indications
and warnings it provides serve only as general
guidelines to minimize the possibility of

decompression sickness and other hazards,
and are not intended to guarantee the safety
of the diver. It is necessary to use other
diving equipment together with the watch
for safety’s sake.

Also note that the possibility of
decompression sickness and other hazards
may increase depending on such factors as
the individual diver’s physiological
characteristics, environmental conditions
and the extent of the diver’s fatigue.

Finally, the watch is intended for use by a
single user. Do not share it with other
divers. If any one other than the owner of
the watch uses it, make sure that the watch
is reset to the initial settings with the
measurements stored in it being all erased.

WARNING

WARNING notes indicate any condition or practice
which, if not strictly observed, could result in severe
personal injury or possible death.

CAUTION

CAUTION notes indicate any condition or practice which,
if not strictly observed, could result in personal injury or
property damage.

English

3

PRECAUTIONS FOR DIVING

● Strictly observe the precautions below to enjoy safe diving with the SEIKO Diving Computer Cal. DH33.

English

IN GENERAL

● Do not stay underwater beyond the no-decompression limits.

● When you have descended below 15 m (50ft), be sure to make

a safety stop in ascent at 3 to 6 m (10 to 20 ft). If the watch gives
a decompression warning, it is recommended that you stay at
the decompression stop depth longer than the stop time that
the watch indicates.

* While making a decompression stop, be sure to check the

amount of air remaining in your tank.

● The watch does not indicate the amount of air in your tank.
Use a submersible pressure gauge to check it.

● For safety’s sake, use other diving equipment such as dive
computer, depth gauge and another diver’s watch together
with the watch.

● The watch cannot serve as your “buddy”. Abide by the rules
of scuba diving, and never dive alone even if you have the
watch on your wrist.

● Abrupt change of altitude after diving is extremely hazardous
to your health. Do not move across the altitude ranks that the
watch indicates.

BEFORE DIVING

● Check that:

• the watch is operating normally.

• there are no visible scratches or cracks in the band and

crystal.

• the band is securely fastened to the watch case.

• the battery life indicator (battery mark) is not shown on

the display.

• all segments of the display are not flashing.

• the altitude rank mark is not flashing.

• not all nine residual nitrogen indicator bars are lit up.

4

* If you find any malfunction, do not use the watch for diving.

● If the temperature of the watch is much higher than that of the
water, for example, after having been left under direct sunlight
before being put in water, the watch may not measure the
depth of water accurately. Soak it in water for approximately
5 minutes before using it for diving.

● Be sure to check that the actual percentage of oxygen in your

● Check that the measurement units of depth and temperature

2) is properly set for the watch. FO2 cannot be

tank (FO
readjusted while you are underwater.

are set according to your requirement. They can be selected
from “meters (m) and centigrade (° C)” and “feet (ft) and
Fahrenheit (° F)”.

WHILE DIVING

● Take care not to hit the watch against hard objects such as
rocks.

● Check that the watch indicates the current depth properly. If
“- - -” or “Err” is shown when the current depth is less than 100
m (329 ft), stop using the watch immediately, and use other
diving equipment such as diving computer, depth gauge and
another diver’s watch you have with you.

● While in the dive mode, the display cannot be changed over to
modes other than time/calendar by pressing button “C”.

● Depending on the aquatic environment where the watch is
used, the beeping sound of the regular alarm and warnings
may or may not reach your ears.

● The watch measures the depth of water on the basis of
seawater having a specific gravity of 1.03. When it is used in
fresh water such as lakes, therefore, the displayed depth
should be corrected by multiplying it by 1.03. No­decompression limits, however, will be calculated and
displayed normally without any adjustment.

Ex.) If the displayed depth of the water is 19.4 m (64 ft) in fresh

water (specific gravity 1.00), the actual depth is:

19.4 m x 1.03/1.00 ≒ 20.0 m (66 ft)

AFTER DIVING

● Be sure to rinse the watch in fresh water, and wash out all
seawater, soil, sand, etc.

● After cleaning the watch in fresh water, be sure to wipe it
thoroughly dry.

● If the watch is left soaked in water for a long time for removing
salt or other purposes, the auto sensor function is activated
and consumes battery energy.

● If a grain of sand or the like gets in the pressure sensor, rinse
the watch in fresh water to wash it out. Do not use anything
with a pointed tip to pick it out or an air blast to blow it out. If
it sticks in the pressure sensor and cannot be washed out,
consult the retailer from whom it was purchased.

● Be careful not to expose the pressure sensor to solvents such
as alcohol and gasoline, as this will cause malfunctions.

● When the surface interval time is less than 10 minutes, time/
calendar setting, FO
made.

● If the measurement exceeds the measurable range of the
watch, all the segments of the display flash. In that case, the
watch cannot be used for diving for 48 hours after the dive is
over.

2 setting and hour correction cannot be

CONTENTS

WARNING ................................................................... 2

PRECAUTIONS FOR DIVING ..................................... 4

FEATURES .................................................................. 6

BUTTONS AND DISPLAY CHANGE .......................... 7

HOW TO USE TIME FUNCTIONS .............................. 8

■ TIME/CALENDAR FUNCTION ................................. 8

TIME/CALENDAR SETTING .......................................... 8

■ REGULAR ALARM FUNCTION ................................ 9

REGULAR ALARM SETTING ........................................ 9

ENGAGEMENT/DISENGAGEMENT OF

REGULAR ALARM AND HOURLY TIME SIGNAL ......... 9

■ ILLUMINATING LIGHT ............................................. 10

■ HOUR CORRECTION FUNCTION ............................ 11

HOW TO USE THE HOUR CORRECTION FUNCTION . 11

HOW TO USE DIVE COMPUTER FUNCTIONS ......... 12

■ NITROX DIVING FUNCTION ................................... 12

HOW TO SET FO2 ...................................................................................... 12

■ ALTITUDE COMPENSATION .................................. 14

■ SELECTION OF MEASUREMENT UNITS ............... 14

HOW TO SET THE DEPTH & TEMPERATURE UNITS .. 14

■ DIVE PLAN FUNCTION ............................................ 15

HOW TO USE THE DIVE PLAN FUNCTION .................. 15

■ DIVE FUNCTION ....................................................... 16

DISPLAY WHILE DIVING .............................................. 16

DISPLAY AFTER A DIVE ............................................... 19

■ DIVE LOG FUNCTION .............................................. 20

HOW TO RECALL LOG DATA ...................................... 20

USE OF TERMS IN THIS MANUAL ........................... 23

DEFINITION OF THE TERMS AND BASIC DESIGN

OF THE WATCH ............................................................ 23

EXPLANATION OF THE TERMS ................................... 24

BATTERY CHANGE .................................................... 26

TO PRESERVE THE QUALITY

OF YOUR WATCH ...................................................... 27

TROUBLESHOOTING ................................................. 28

SPECIFICATIONS ........................................................ 29

Page

English

5

FEATURES

The SEIKO Diving Computer Cal. DH33 is a digital diver’s watch featuring dive computer functions.

English

An algorithm is programmed into it to calculate multilevel diving.

DIVE COMPUTER FUNCTIONS

■ Algorithm

● The watch has an algorithm that calculates multilevel diving.

● The watch uses an algorithm developed by Mr. Randy

Bohrer, one of the most distinguished scientist in this field,
which expands upon the theories of the so-called Swiss
model.

■ Dive function

● The watch is equipped with an auto switch that senses

water and activates the dive function.

● The diving data is measured automatically while diving
between 1.5 m (5 ft) and 99.9 m (328 ft), eliminating the need
for any button operation.

● The residual nitrogen and residual oxygen are indicated
graphically for a quick grasp of the current safety situation.

■ Altitude compensation

● The watch measures the current altitude automatically,

calculating the residual nitrogen and other data for the next
dive taking into account the altitude change following an air
flight or move to high ground.

■ Nitrox diving function

● The watch can provide data for nitrox diving.

● The percentage of oxygen (FO

scuba tank can be set for the watch from 22% to 50%.

2) in the gas mixture of your

■ Dive plan function

● No-decompression limits are calculated, automatically

taking into consideration the current residual nitrogen and
altitude.

● This mode is convenient for planning the next dive.

■ Dive log function

6

● Details of up to 30 dives are recorded automatically.

● The log data includes date of dive, entry/exit time, dive time,

maximum depth, FO
mixture), and residual nitrogen/oxygen at the end of dive.

● The measurement units of depth and temperature can be
selected from “meters (m) and centigrade (° C)”, and “feet (ft)
and Fahrenheit (° F)”.

TIME FUNCTIONS

■ Time/calendar function

● Hour, minutes, seconds, month, date and day are displayed.

■ Fully automatic calendar

● The calendar adjusts automatically for odd and even months

including February of leap years up to 2050.

■ Regular alarm function

● The alarm can be set to ring once a day at a designated time.

Hourly time signal and alarm test functions are also provided.

■ Hour correction function

● When you are traveling around different time zones, the

time and calendar of the place you visit can be shown easily
with only the press of a button. The time can be adjusted in
30 minute increments, making it available for those areas
having a time difference in 30 minute increments from
GMT.

OTHER FUNCTION

■ Illuminating light (Electroluminescent panel)

● Certain materials emit light when voltage passes through

them. This phenomenon, known as “electroluminescence”,
is used to illuminate the display.

● With the press of a button, the light illuminates the display
for 2 to 3 seconds for easy viewing in the dark.

2 setting (percentage of oxygen in gas

BUTTONS AND DISPLAY CHANGE

A

A

A

A

A

A

C

B

A

D

A

● Other than in the DIVE mode, the display changes in the following order by pressing button .

* The display indicator “ ” shows to which display the watch is set.

* If the watch is left untouched in any of the displays other than TIME/CALENDAR and DIVE, the display will automatically return to the TIME/CALENDAR in 5 to 6 minutes.

English

TIME/CALENDAR function

• Displaying time,
calendar (month,
date and day)
and designated
alarm time

Press button .

➟

HOUR CORRECTION function

• Adjusting the time
difference

Press button .

➟

• Recalling log
data

Press button .

● When you make a dive, the auto
switch (water contact sensor)
works to change over the mode

automatically.

to DIVE

Auto switch

Pressure sensor

DIVE function

Press button .

(Water contact

sensor)

REGULAR ALARM function

• Setting regular
alarm and turning
on/off hourly time
signal

➟

Press button .

NITROX DIVING function

• Setting
percentage of
oxygen (FO

➟

Press button .

DIVE PLAN functionDIVE LOG function

• Planning the next
dive

2)

7

A

B

A

B

C

D

C

D

B

HOW TO USE TIME FUNCTIONS

English

■ TIME/CALENDAR FUNCTION

TIME/CALENDAR SETTING

● The time/calendar setting cannot be made for 10 minutes

after a dive.

Press to show TIME/CALENDAR display.

Current

time

Regular

alarm

time

▼

Press to show TIME/CALENDAR SETTING display.

* If the watch is left untouched in the TIME/CALENDAR SETTING

display, the display will automatically return to the TIME/
CALENDAR in 1 to 2 minutes.

▼

Press to select the digits to be adjusted (flashing).

▼

* With each press, the digits flash in the following order:

Seconds Minutes

➡

➡

▼

8

• Regular alarm
time is displayed
only when it is
set.

Hour Year

➡

➡

Date Month12-/24-hour indication

➡

➡

➡

▼

▼

Press to set the flashing digits.

* The digits move quickly by keeping the button pressed.

* When both the hour and minute digits are flashing, changeover

between 12- and 24-hour indications can be made.

* For the 12-hour indication, “AM” or “PM” is shown. There is

no mark for the 24-hour indication.

< Seconds setting >

When the seconds digits are flashing, press button D in
accordance with a time signal. The digits are reset to “00” and
start immediately.

* When the digits count any number from 30 to 59, one minute is

added and the seconds start immediately.

▼

Press to return to TIME/CALENDAR display.

When all the segments of the display light up:

● If buttons C and D are pressed at the same time in the

TIME/CALENDAR SETTING display, all the segments of
the display will light up. This is not a malfunction. Press
button A, B, C or D to return to the TIME/CALENDAR
display, and set the time/calendar again.

A

B

D

B

C

D

A

C

B

C

■ REGULAR ALARM FUNCTION

● The alarm can be set to ring once a day at a designated time.

● Once the alarm is set, the set time is shown in the TIME/CALENDAR display.

● Alarm can be tested.

● Hourly time signal is provided.

REGULAR ALARM SETTING

Press to show REGULAR ALARM display.

▼

Press to show REGULAR ALARM SETTING display.

▼

With each press, flashing digits change in the

▼

following order:

Hour Minutes

▼

Press to set the flashing digits.

* The digits move quickly by keeping the button pressed.

▼

Press to return to REGULAR ALARM display.

Notes:

1. If the watch is left untouched in the REGULAR ALARM SETTING
display, the display will automatically return to the TIME/
CALENDAR in 1 to 2 minutes.

➡

➡

2. When the digits are adjusted in the REGULAR ALARM SETTING
display, the alarm is engaged automatically, and the regular
alarm mark is shown on the display.

3. When setting the hour digits in the 12-hour indication, check that
AM/PM is correctly set. “A” or “P” is shown for the AM or PM
setting, respectively.

ENGAGEMENT/DISENGAGEMENT OF REGULAR ALARM
AND HOURLY TIME SIGNAL

HOW TO USE TIME FUNCTIONS

With each press in the REGULAR ALARM display,
the regular alarm and hourly time signal are engaged
and disengaged in the following order:

➡

Both engaged

➡

Neither engaged

➡

Alarm engaged

➡

Hourly time signal engaged

English

9

C

D

D

D

B

A

C

D

HOW TO USE TIME FUNCTIONS

English

● How to stop the regular alarm

The regular alarm rings at the designated time for 20 seconds
and stops. While the alarm is ringing, the regular alarm mark

flashes. To stop them manually, press button , ,

, or in any display.

● Alarm test

Press and hold buttons and at the same time in

the REGULAR ALARM or TIME/CALENDAR display.

Notes:

1. While you are underwater, the regular alarm rings for 3 seconds
and stops, but the regular alarm mark flashes for up to 20
seconds.

2. In testing the alarm, if button C is pressed just before pressing
button D, the engagement/disengagement of the regular alarm
and hourly time signal will be made. Show the REGULAR
ALARM display to engage or disengage them as required,
following the procedure above.

■ ILLUMINATING LIGHT

Press in the displays other than DIVE PLAN and
DIVE LOG to turn on the illuminating light.

• The display panel
is evenly
illuminated for 2
to 3 seconds.

Notes:

1. While the illuminating light is used, the watch may make a very
small noise. However, this is not a malfunction.

2. The electroluminescent panel loses its luminance as the battery
voltage becomes lower. Also, its luminance level decreases
gradually with use.

3. When the illuminating light becomes dim, replace the battery
with a new one. If the light remains dim after the battery is
replaced, have the electroluminescent panel replaced with a
new one by the retailer from whom the watch was purchased.
It will be replaced at cost.

10

A

B

C

D

C

D

B

A

B

HOW TO USE TIME FUNCTIONS

■ HOUR CORRECTION FUNCTION

● When you travel around different time zones, the time/calendar of the place you visit can be set easily.

● The time difference can be adjusted in 30 minute increments up to 24 hours. The calendar is also adjusted accordingly.

● When you dive in a different time zone, it is recommended that you use this function to set the time/calendar of the diving site before

diving.

HOW TO USE THE HOUR CORRECTION FUNCTION

Press to show HOUR CORRECTION display.

▼

Press to show TIME DIFFERENCE SETTING display.

Current time

▼

or

* With each press of buttons C or D, 30 minutes are increased

▼

Press to return to HOUR CORRECTION display.

Press to set the time/calendar of the
place you visit.

• “+” and “–”
appear near
buttons C and
D, respectively.

or decreased, respectively. The digits move quickly by keeping
the respective buttons pressed.

Notes:

1. For 10 minutes after a dive, the hour correction cannot be made.

2. If the watch is left untouched in the TIME DIFFERENCE SETTING
display, the display will automatically return to the TIME/
CALENDAR in 1 to 2 minutes.

3. Check that AM/PM and calendar are correctly set.

English

11

A

B

B

A

B

C

D

C

D

HOW TO USE DIVE COMPUTER FUNCTIONS

English

■ NITROX DIVING FUNCTION

● The percentage of oxygen in the air used for ordinary diving is 21%. The higher percentage of oxygen in the gas mixture means a lower

percentage of nitrogen than ordinary air, reducing the risk of decompression sickness.

WARNING

● This function should be used only when you dive with
a gas mixture of oxygen and nitrogen other than
ordinary air. When diving with air, be sure to set the
percentage of oxygen (FO

● Never use the watch for diving with any value other
than the actual percentage of oxygen in your tank set

2.

for FO

● By setting “Air” for FO2, the percentage of oxygen is set to 21% as in the ordinary air. FO2 can be set from 22% to 50% according to

the gas mixture of your scuba tank.

● When a value between 22 and 50 is set for FO2, the nitrox mark “Nx” appears on the display, and the watch is shifted for nitrox diving.

● The watch calculates the no-decompression limit, residual nitrogen and other data according to the FO2 you have set.

2) to “Air”.

● If you have set FO2 for nitrox diving, be sure to re-check
the FO2 setting before a dive. On the day following the
day you made a nitrox dive, “– –” is displayed in place
of the FO

2 setting, “Nx” flashes, and the watch cannot

be used for diving. In that case, set FO2 again.

HOW TO SET FO2

Press to show FO2 display.

▼

Press to show FO2 SETTING display.

* For diving with ordinary air, set “Air” for FO2.

Percentage of oxygen
“Air”: 21% for diving with ordinary air

▼

12

▼

or

Nitrox mark

*

* If a value between 22% and 50% is set for FO2, the nitrox

▼

Press to return to FO2 display.

Press to set FO2.

• “+” and “–”
appear near
buttons C and
D, respectively.

With each press of buttons C and D, the percentage is increased
and decreased in increments of 1%, respectively. The digits
move quickly by keeping the respective buttons pressed.

mark “Nx” appears on the display.

A

B

B

A

C

C

D

C

D

B

HOW TO USE DIVE COMPUTER FUNCTIONS

English

Notes:

1. For 10 minutes after a dive, FO

2. If the watch is left untouched in the FO
display will automatically return to the FO

When the nitrox mark “Nx” is flashing:

Nitrox mark

● If FO2 was set for nitrox diving the previous day and the date

has changed to the next, a flashing “Nx” is shown on the
display. In that case, be sure to set FO
next dive according to the gas mixture of your scuba tanks.

● How to re-set FO2

Press to show FO2 display.

▼

Press to show FO2 SETTING display.

▼

2 setting cannot be made.

2 SETTING display, the

2 in 1 to 2 minutes.

2 newly before the

▼

Press once to show “Air” for diving with ordinary
air.

• “Nx”

▼

or

▼

Press to return to FO2 display.

Press to set FO2 if you wish to dive
with nitrox.

disappears.

13

A

B

B

A

HOW TO USE DIVE COMPUTER FUNCTIONS

English

■ ALTITUDE COMPENSATION ■

SELECTION OF MEASUREMENT UNITS

● This watch has a built-in pressure sensor to measure the

altitude (above sea level) and indicates the altitude rank
graphically in four levels.

● Residual nitrogen, no-decompression limits for the next dive

and other data are calculated taking into account the current
altitude.

● As you move across altitude ranks, the watch re-calculates

residual nitrogen on the spot.

Altitude rank indicator

Altitude

rank

Indicator

Altitude

above

sea level

Notes:

1. The altitude range in the above table provides general guideline

2. If the watch senses an altitude change across altitude ranks, the

14

0

Nil

0 ~ 900

m

0 ~ 3000

ft

of altitude only, and the altitude rank indication does not indicate
a specific altitude.

residual nitrogen indicator may appear even while you are on the
surface. This is not a malfunction.

1

600 ~ 1700

m

2000 ~ 5500

ft

23

1300 ~ 2500

4300 ~ 8200

m

ft

2200 ~ 6000

m

7200 ~ 19700

ft

Measurement

error

(Flashing)

6001 m and

higher

19700 ft and

higher

● The measurement units of depth and temperature can be

selected from “meters (m) and centigrade (° C)” and “feet (ft)
and Fahrenheit (° F)”.

HOW TO SET THE DEPTH & TEMPERATURE UNITS

Press to show DIVE PLAN display.

Depth unit

▼

Press for 4 to 5 seconds to change over the depth
and temperature units.

* With each press of the button, the units of depth and

temperature change over alternately between “meters and
centigrade” and “feet and Fahrenheit”.

Note:

Once the units of depth and temperature are set in the DIVE PLAN
display, those in the DIVE LOG display and the DIVE mode will also
be set accordingly.

A

C

D

C

D

A

HOW TO USE DIVE COMPUTER FUNCTIONS

■ DIVE PLAN FUNCTION

WARNING

● Before using the dive plan function, be sure to check the gas mixture of your scuba tank, set FO2 accordingly and set
the unit of depth as required.

● Use this function for planning a dive before diving.

● No-decompression limits corresponding to each of the 14 ranks of depth of water are displayed.

Depth rank : ● In meters : 9 m, 12 m, 15 m, 18 m, 21 m, 24 m, 27 m, 30 m, 33 m, 36 m, 39 m, 42 m, 45 m and 48 m.

●

No-decompression limits are calculated according to FO2 you have set, current altitude rank and residual nitrogen during surface interval.

● In feet : 30 ft, 40 ft, 50 ft, 60 ft, 70 ft, 80 ft, 90 ft, 100 ft, 110 ft, 120 ft, 130 ft, 140 ft, 150 ft and 160 ft.

English

HOW TO USE THE DIVE PLAN FUNCTION

Press to show DIVE PLAN display.

No-decompression limit

2 you have set

FO

▼

or

Press to select the desired depth rank.

Depth rank

• “9 m” / “30 ft”
is displayed
first.

• “+” and “–”
appear near
buttons C and
D, respectively.

* With each press of buttons C and D, the depth rank advances

and moves back by one rank, respectively. It changes quickly
by keeping the respective buttons pressed.

* As you select a depth rank, the watch calculates and displays

a corresponding no-decompression limit.

Notes:

1. The display cannot be changed over to the DIVE PLAN for 10
minutes after a dive.

2. Please note that it may take some time to calculate no­decompression limits.

3. During surface interval:
While the watch counts down

the desaturation time during
surface interval, surface time
and desaturation time are also
shown in the DIVE PLAN
display.

4. When planning a dive with nitrox:
Depending on the FO

decompression limit for a depth rank. It indicates that the
selected depth rank exceeds the maximum depth to which you
can descend with the gas mixture you have set.

Surface time

2 setting, “– –” appears in place of no-

Desaturation time

15

D

D

C

C

HOW TO USE DIVE COMPUTER FUNCTIONS

English

English

■ DIVE FUNCTION

● The auto switch (water contact sensor) senses water and automatically activates the DIVE FUNCTION, showing the DIVE display. There

is no need to change the displays manually.

● As you descend to 1.5 m (5 ft) underwater, the watch starts showing the current depth and measuring the diving time.

● During a dive, the watch automatically measures depth, water temperature and dive time, and provides the information necessary for

diving including warnings on hazards.

WARNING

● Before making a dive, be sure to check the function of
your watch, following the instructions set forth in
“BEFORE DIVING” in “PRECAUTIONS FOR DIVING” on
page 4.

● Also, be sure to set FO

2 according to the gas mixture of

DISPLAY WHILE DIVING

During no-decompression diving

Residual nitrogen indicator

No-decompression limit

Dive time

your scuba tank. FO

2 cannot be re-adjusted while you

are underwater.

● Select the measurement units of depth and temperature
as you require. They cannot be selected while you are
underwater.

Oxygen limit indicator

FO2 you have set

Current depth

Maximum depth

Press to illuminate the display for 2 to 3 seconds.

* The illuminating light will not stay lit if the button is kept

16

16

pressed.

Water temperature

Press and hold to display current time, partial
pressure of oxygen (PO

* The display is illuminated for 2 to 3 seconds.

2) and data.

Current time

Partial pressure of
oxygen (PO

2)

HOW TO USE DIVE COMPUTER FUNCTIONS

English

English

After no-decompression limit reaches “0”
(during decompression diving):

● Never dive beyond the no-decompression limit.

Residual nitrogen indicator

stop depth

Decompression stop time

● When the no-decompression limit reaches “0” while

diving, all the residual nitrogen indicators are displayed
to indicate that the watch has shifted to decompression
diving mode.

● After you make decompression stops as indicated by the

watch, it will resume calculation of no-decompression
diving.

★ Total ascent time refers to the minimum time required to

stay underwater before surfacing, including the
decompression stop time at the indicated decompression
stop depths.

Dive time

Current depth

Total ascent timeDecompression

Decompression diving mark

WARNING

● Do not make a decompression stop at a depth
shallower than the decompression stop depth the
watch indicates. It is in violation of the decompression

stop warning, and the watch will not count down the
decompression stop time and total ascent time even
if you make a stop during ascent.

● Even after the watch has given a decompression stop
violation warning, it will resume calculation of no­decompression diving if you return to the indicated
decompression stop depth and make a decompression
stop as indicated by the watch. If you continue

★

ascending and surface, defying the warning, the
watch cannot be used for diving for 48 hours. During

that time period, the watch is not set to calculate
decompression diving, and only the surface interval
and dive log displays are shown. If the aquatic
environment permits, it is recommended that you

make a decompression stop at a depth 1 to 2 m (3 to
7 ft) deeper than the indicated decompression stop
depth. In that case, take care that you should stay at

the depth for a longer time period than the
decompression stop time that the watch indicates.

17

17

HOW TO USE DIVE COMPUTER FUNCTIONS

WARNINGS DURING A DIVE

English

English

Indication DescriptionWarning

Ascent rate warning

(flashing)

Decompression
warning

Decompression stop
violation warning

(flashing)

PO2 limit warning
(Warning on partial
pressure of oxygen)

(flashing)

OLI warning
(Warning on oxygen
limit)

(flashing)

Out of range warning

(flashing)

* The watch will not measure the current depth while the warning sound is beeping.

18

18

If you ascend in water at a rate greater than the specified one, flashing “SLOW”
appears for 5 seconds and the warning sound beeps for 3 seconds.

Three rates are specified depending on the depth level.

0.0 ~ 5.9 m (0 ~ 19 ft) : 8 m (26 ft)/min

6.0 ~ 17.9 m (20 ~ 59 ft) : 12 m (39 ft)/min

18.0 m (60 ft) and deeper : 16 m (52 ft)/min

* The watch calculates the ascent rate by measuring the current depth every 6 seconds.

If you accidentally exceed the no-decompression limit, the watch is shifted to the
decompression mode, flashing “DECO” is shown, and the warning sound beeps
for 3 seconds.

If you ascend to a depth shallower than the decompression stop depth that the
watch indicates, it gives a decompression stop violation warning. The current
depth, decompression stop depth, decompression stop time and “DECO” all
flash, and the warning sound beeps for 3 seconds.

When you return to a depth deeper than the decompression stop depth, the watch
starts counting down the decompression stop time.

If the partial pressure of oxygen (PO2) reaches 1.5, the warning sound beeps for
3 seconds. By pressing and holding button C to show PO
the oxygen limit indicators flashing.

If PO

2 exceeds 1.6, the “O2” mark starts flashing, and the warning sound beeps

for 3 seconds. By pressing and holding button C to show PO
oxygen limit indicators flashing.

It appears when all the oxygen limit indicators are flashing.

It appears when the measurement exceeds the specified value as follows:

• Maximum depth exceeds 99.9 m (328 ft).

• Dive time exceeds 599 minutes.

• Decompression stop depth exceeds 15 m (50 ft).

• Decompression stop time exceeds 99 minutes.

2, you can see some of

2, you can see all the

DISPLAY AFTER A DIVE

C

C

When you are less than 1.5 m (5 ft) underwater and
the auto switch senses water:

Current depth

HOW TO USE DIVE COMPUTER FUNCTIONS

When you are less than 1.5m underwater or on the
surface and the auto switch does not sense water:

English

English

● The watch shows the dive display with the current depth being

“0.0 m (0 ft)”.

● If the watch shows the dive display after you surface, check

that water does not remain on the auto switch.

● If the watch measures the current depth of greater than 1.5 m

(5 ft) within 10 minutes after this display is shown, the
previous and the new dives are considered inseparable, and
the dive times of both dives and the surface interval time are
added together.

• TIME/CALENDAR display

Surface interval

time

Press and hold to show the surface interval time
and desaturation time.

Desaturation
time

19

19

A

D

A

C

D

C

D

HOW TO USE DIVE COMPUTER FUNCTIONS

English

■ DIVE LOG FUNCTION

● The log data recorded automatically while diving can be recalled.

● The stored data includes almost all the data necessary for keeping in log books.

● Log No., date of dive, entry time, exit time, dive time, dive No. on that day, percentage of oxygen, average depth, maximum depth

and water temperature at maximum depth are displayed in the two separate dive log displays.

● Details of up to 30 dives can be stored in memory. If more than 30 dives are made, the oldest data will be erased from memory.

HOW TO RECALL LOG DATA

Press to show DIVE LOG display.

* 1st dive log display for the newest dive will appear.

Log No.

(“20-1” denotes
the 1st dive log
display for the
20th dive.)

Dive time

▼

Entry time

Press to show the 2nd dive log display for the
newest dive.

Residual oxygen

at end of dive

Log No.

(“20-2” denotes
the 2nd dive log
display for the
20th dive.)

Maximum depth

▼

20

Residual nitrogen at end of dive

Date of dive
(December 6)

Dive No.
on that day

Exit time

FO2 used for the dive

(“Air” denotes oxygen
percentage of 21% )

Average depth

Water temperature
at maximum depth

▼

or

* The display changes in the following order by pressing button

Notes:

1. Nitrox mark appears when a value between 22% and 50% is set

2.

for FO

2. The entire log data of a dive is divided and shown in two separate
displays. Check the log No. to show the data as required.

Press to show the dive log for other
dives.

C or D:

Ex.) When details of 20 dives have been recorded:

Dive log for “20-1”

▼

Dive log for “20-2”

▼

Dive log for “19-1”

▼

Dive log for “19-2”

▼

Dive log for “1-1”

▼

Dive log for “1-2”

1st display shown when the dive
log function is activated.

By pressing button D, the display
changes over in the direction of the
arrows.
By pressing button C, the display
changes over in the opposite
direction of the arrows.

The display changes quickly by
keeping the respective buttons
pressed.

When “1-2” is shown, pressing
button D will not change over the
display.

WARNINGS SHOWN IN DIVE LOG DISPLAY

Indication DescriptionWarning

Ascent rate warning

(flashing)

Decompression
warning

Decompression stop
violation warning

(flashing)

PO2 limit warning
(Warning on partial
pressure of oxygen)

(flashing)

OLI warning
(Warning on oxygen
limit)

(flashing)

Out of range warning

HOW TO USE DIVE COMPUTER FUNCTIONS

It appears if the rate of ascent has exceeded the specified value two times in a row.

It appears if you have exceeded no-decompression limit and have made a
decompression stop.

It appears if you have exceeded no-decompression limit but have not made a
decompression stop as indicated by the watch.

It appears if the partial pressure of oxygen (PO2) has exceeded 1.5.

It appears when all the oxygen limit indicators have lit up.

It appears when the measurement has exceeded the specified value.

Ex.) Maximum depth exceeded 99.9 m (328 ft).

English

(flashing)

21

A

B

B

A

B

C

D

C

D

HOW TO USE DIVE COMPUTER FUNCTIONS

English

When more than 30 dives are made:

● If a new dive is made when log data of 30 dives are stored

in memory, the log data for the oldest dive is erased from
memory and the data for the new one is recorded in
memory.

● In that case, log No. for the existing data will be reduced by

one.

Dive that is not recorded in the dive log function

Even if the dive function is started by measuring a depth greater than

1.5 m (5 ft), a dive that lasts less than 3 minutes will not be recorded.

▼

and

Press and hold at the same time.

● How to erase the log data in memory

The entire log data stored in memory can be erased as
required.

Press to show DIVE LOG display.

▼

Press to show LOG DATA ERASURE display.

▼

22

• Flashing “LoG­CLE” appears.

• Flashing quickly.

* “LoG-CLE” flashes quickly and then stops flashing after a

few seconds, indicating that the entire log data has been
erased from memory.

▼

Press to return to DIVE LOG display.

• Remains displayed.

• No log data is
stored in
memory.

USE OF TERMS IN THIS MANUAL

DEFINITION OF THE TERMS AND BASIC DESIGN OF THE WATCH

English

Terms Definition and basic design of the watch

Depth

Dive time
(DIVE. T)

Water
temperature

The watch measures the depth of water
from 1.5 m (5 ft) up to 99.9 m (328 ft) in 0.1 m
(1 ft) increments. The measurement is made
on the basis of seawater having a specific
gravity of 1.03.

Ex.) If the displayed depth of the water is 19.4

m (64 ft) in fresh water (specific gravity

1.00), the actual depth is:

19.4 m (64 ft) x 1.03/1.00 = 20.0 m (66 ft)

No-decompression limits and residual
nitrogen the watch provides are calculated
on the basis of water pressure only, and can
be used while diving in fresh water without
any conversion.

The watch measures and indicates dive time
in one minute increments up to 599 minutes.
It starts measuring the time when the diver
descends more than 1.5 m (5 ft), and stops
when the diver ascends to a depth of less
than 1.5 m (5 ft).

The watch measures the water temperature
in 0.1° C (1° F) increments from -5.0° C up to
+40.0° C (23° F up to 104° F). The water
temperature recorded in the dive log function
is a measurement taken at the maximum
depth.

Surface
interval
time
(SURF. T)

Algorithm

De­compression
diving

Definition and basic design of the watchTerms

The watch measures the time spent on the
surface in one minute increments up to 48
hours, starting from the time when the diver
ascends to a depth of less than 1.5 m (5 ft).

If the diver descends to a depth of greater
than 1.5 m (5 ft) when the surface interval
time is less than 10 minutes, the previous
and the new dives are considered
inseparable, and the dive times of both dives
and the surface interval time are added
together.

The watch uses an algorithm developed by
Mr. Randy Bohrer, one of the most
distinguished scientists in this field, which
expands upon the theories of the so-called
Swiss model.

The watch is intended for use in no­decompression diving (diving which allows
you to make a direct, continuous ascent to
the surface). Anticipating emergencies, it
provides information for decompression
diving.

* Decompression diving refers to diving which

requires stops at specified depths during
ascent, due to an impermissible amount of
nitrogen having accumulated in the diver’s
body.

23

EXPLANATION OF THE TERMS

Terms Explanation

English

Altitude
rank

Residual
nitrogen
indicator

Desaturation

time

FO2
(Percentage
of Oxygen)

Nitrox

mark

Depth rank

The pressure sensor measures the
atmospheric pressure at regular intervals,
and the watch indicates the altitude rank in
four levels from 0 to 3. The measurable
range of altitude is 0 ~ 6,000 m (19,700 ft). If
the measurement is outside this range, the
altitude rank indicator flashes.

The amount of nitrogen absorbed by the
diver’s body is indicated graphically in 10
levels from 0 to 9 by the number of bars
shown on the display. When all 9 indicator
bars light up, the watch calculates
decompression diving.

The time required for the excess amount of
nitrogen accumulated in the diver’s body
during a dive to be eliminated completely. It
is indicated in hours and minutes, and the
watch counts it down. Desaturation is
considered to be completed when the
countdown is over.

The percentage of oxygen in the gas mixture
of the scuba tank, which the diver needs to
set for the watch before diving. For diving
with air, “Air” (21%) should be set. FO
be set from 22% to 50%, and if a value within
this range is set, the watch calculates nitrox
diving, and the nitrox mark “Nx” is shown
on the display. The set FO
dive log function.

If the watch is left untouched with “Nx”
shown on the display after a dive, it starts
flashing on the next day to indicate that FO
should be re-set. Otherwise, “– –” is shown
in place of the previous FO
watch cannot be used for diving.

For planning a dive, the depths from 9 m to
48 m (30 ft to 160 ft) are divided into 14 ranks
in 3 m (10 ft) increments.

24

2 can

2 is recorded in the

2 setting, and the

ExplanationTerms

No-de­compression
limit (NDL)

Log No.

Number of
dives on
that day

Entry time

Exit time

Average
depth

2

Maximum
depth

The maximum time during which the diver
can stay at the current depth or in the selected
depth rank without decompression
procedure. The watch indicates NDL up to
200 minutes.

In the DIVE PLAN display, if you choose a
depth rank where the partial pressure of
oxygen exceeds 1.6, “– –” is displayed in
place of NDL.

The order of diving data stored in memory.
Details of up to 30 dives can be recorded.
The log data of a dive is shown in two
separate displays. They have different log
Nos. such as “30-1” and “30-2”.

The number of dives made on the same day.
It is recorded in the dive log function.

The time when the dive is started. The watch
records the time when the diver descends to
a depth of more than 1.5 m (5 ft).

The time when the dive is finished. It
corresponds to the hour and minute when
the diver ascends to less than 1.5 m (5 ft)
underwater.

The average depth is calculated from the
depth data measured during a dive. It can be
checked in the dive log function.

The greatest measurement of depth during
a dive.

EXPLANATION OF THE TERMS

Terms Explanation Terms Explanation

Current
water
temperature

Water
temperature
at maximum
depth

Residual
nitrogen at
end of dive

Residual
oxygen at
end of dive

De­compression
stop depth

The watch measures the water temperature
every minute in 0.1° C (1° F) increments from

-5.0° C up to +40.0° C (23° F up to 104° F). If
the measurement is outside the range, “Lo”
or “Hi” is displayed.

The water temperature at the maximum
depth is recorded in the dive log function.

Residual nitrogen at the end of a dive is
recorded in the dive function and indicated
graphically by the number of bars.

Residual oxygen at the end of a dive is
recorded in the dive function and indicated
graphically by the number of bars.

The depth at which the diver should make a
decompression stop. It is calculated on the
basis of the diving data collected during the
dive, and selected from 15, 12, 9, 6 and 3 m
(50, 40, 30, 20 and 10 ft). If the diver ascends
to a depth shallower than the indicated depth,
a decompression stop violation warning is
given.

De­compression
stop time

Total
ascent
time

PO2
(Partial
pressure of
oxygen)

Oxygen
limit
indicator

The time period during which the diver
should stay at the decompression stop depth.
It is calculated on the basis of the diving data
collected during the dive, and is counted
down while the decompression stop is being
made.

The minimum time required to stay
underwater before surfacing, including the
decompression stop.

PO2 is calculated on the basis of the depth
and the FO
gas mixture). When PO
warning is given.

The amount of excess oxygen in the diver’s
body is indicated graphically in 9 levels by
the number of bars shown on the display.

In nitrox diving, the diver is exposed to
higher levels of oxygen. If all the indicator
bars light up, ascend to a shallower depth,
as you are in danger of suffering from oxygen
toxicity.

2 setting (percentage of oxygen in

English

2 exceeds 1.5, a

25

BATTERY CHANGE

English

Years

3

The miniature battery which powers your watch
should last approximately 3 years. However,
because the battery is inserted at the factory to
check the function and performance of the watch,
its actual life once in your possession may be less
than the specified period. When the battery
expires, be sure to replace it as soon as possible
to prevent any malfunction. It will be replaced at
cost. For battery replacement, we recommend
that you contact an AUTHORIZED SEIKO DEALER
and request SEIKO CR2032 battery.

* The battery life may be less than 3 years if the regular

alarm is used more than 10 seconds a day, the
illuminating light more than 10 seconds a day, and/or
the diving function more than 50 times a year, one
hour per dive.

Battery life indicator

If the battery mark is shown on the display, the watch will
stop operating in about a week. Take the watch to the
retailer from whom it was purchased to replace the battery
with a new one.

• While the mark is
shown, the watch
cannot be used

Battery mark

* While the battery mark is shown, the dive function will not start.

If the battery mark starts flashing, the battery is nearing its end.
Take the watch to the retailer from whom it was purchased
immediately for battery replacement.

for diving.

Notes:

1. The log data stored in the dive log function is not erased when the
battery is replaced with a new one. It is possible, however, for the
stored log data to be inadvertently erased during the function checking
procedures after battery replacement.
data in memory be noted down in your log book before requesting a
battery change.

2. For battery replacement, take the watch to the retailer from whom it
was purchased. The work of replacing the battery is conducted at a
SEIKO SERVICE CENTER. For safety’s sake, the watch will also
undergo a strict check on its water resistant quality and depth
measurement function in addition to battery replacement. Therefore,
it will take approximately 2 weeks before the watch is returned to you.

3. After the battery is replaced with a new one, “meters (m) and
centigrade (° C)” are automatically set for the measurement units.
Before diving, therefore, set the measurement units as required. (See
“SELECTION OF MEASUREMENT UNITS”)

It is recommended that the log

WARNING

● Do not remove the battery from the watch.

● If it is necessary to take out the battery, keep it out of

the reach of children. If a child swallows it, consult a
doctor immediately.

CAUTION

● Never short-circuit, heat or otherwise tamper with

the battery, and never expose it to fire. The battery
may burst, become very hot or catch fire.

● The battery is not rechargeable. Never attempt to

recharge it, as this may cause battery leakage or
damage to the battery.

26

TO PRESERVE THE QUALITY OF YOUR WATCH

English

■ TEMPERATURES

Your watch works with stable accuracy within a

+60°C

temperature range of 5°C and 35°C (41°F and 95°F).
Temperatures over 60° C (140° F) or below –10°

-10°C

C(+14° F) may cause a slight time loss or gain or
battery leakage or shorten the battery life.
However, the above conditions will be corrected
when the watch returns to normal temperature.

■ SHOCKS & VIBRATION

Be careful not to drop your watch or hit it against
hard surfaces.

■ MAGNETISM

Your watch will not be affected by magnetism.

S

N

■ CHEMICALS

Be careful not to expose the watch to solvents,
mercury, cosmetic spray, detergents, adhesives or
paints. Otherwise, the case, bracelet, etc. may
become discolored, deteriorated or damaged.

■ CARE OF CASE AND BRACELET

To prevent possible rusting of the case and bracelet,
wipe them periodically with a soft dry cloth.

■ PERIODIC CHECK

It is recommended that the watch be checked once

2 - 3

Years

every 2 to 3 years. Have your watch checked by
an AUTHORIZED SEIKO DEALER or SERVICE
CENTER to ensure that the case, buttons, gasket
and crystal seal remain intact.

■ PRECAUTION REGARDING
CASE BACK PROTECTIVE FILM

If your watch has a protective film and/or a sticker
on the case back, be sure to peel them off before
using your watch.

■ STATIC ELECTRICITY

The IC (Integrated Circuit) used in your watch will
be affected by static electricity, which may disturb
the display. Keep the watch away from close contact
with objects such as TV screens, which emit strong
static electricity.

■ LIQUID CRYSTAL PANEL

The normal life expectancy for a liquid crystal panel
is approximately 7 years. After that it may decrease

7 Years

in contrast, becoming difficult to read. Please contact
your AUTHORIZED SEIKO DEALER or SERVICE
CENTER if you wish to have a new panel fitted
(guaranteed one year).

27

TROUBLESHOOTING

English

The display became blank. The battery has run down. Take the watch to the retailer from whom it was purchased

The battery life indicator is shown.
The battery life indicator is flashing.

The watch gains/loses occasionally. The accuracy will be corrected when the watch returns to normal

A blur inside the glass persists.

Three altitude rank indicator bars are
flashing.

The number of residual nitrogen
indicator bars on the display
increased while on the surface.

The number of residual nitrogen
indicator bars on the display
increased during flight.

The display will not return to the
TIME/CALENDAR after diving.

The dive function was shown while
on the surface, and a depth of more
than 1.5 m (5 ft) was displayed.

The dive function will not start.

Problem Possible cause Solution

The battery is nearing its end.

The watch was left in low or high
temperatures.

The gasket is deteriorated, and water
got inside the watch.

Unless you are at an altitude over 6,000
m (19,700 ft), the pressure sensor is out
of order.

You moved to a higher altitude across
the altitude ranks.

The atmospheric pressure inside
airplanes corresponds to altitude rank
“2”, and the watch has re-calculated
the altitude.

Water remains on the auto switch.

Water remains on the auto switch, or
the auto switch was turned on during
flight and the airplane landed.

A dive beyond the specified limit was
made within the past 48 hours.

The battery life indicator is lighting up or
flashing.

Three altitude rank indicator bars are
flashing.

immediately for battery replacement.

temperature. Set the time before using the watch. It is so adjusted
that it operates with stable accuracy when used on the wrist within
a temperature range between 5° C and 35° C (41° F and 95° F).

Consult the retailer from whom it was purchased.

The watch senses the atmospheric pressure change and re­calculates residual nitrogen. The obtained residual nitrogen will be
taken into consideration in calculations in the dive plan function.

Wipe the auto switch with a dry cloth.

Make sure that the auto switch is always clean and dry. In a place
such as inside an airplane where the atmospheric pressure changes
sharply, take utmost care not to leave the auto switch wet.

Do not use the watch for diving for 48 hours.

Take the watch to the retailer from whom it was purchased
immediately for battery replacement.

The watch cannot be used for diving at an altitude over 6,000 m
(19,700 ft). Unless you are at an altitude over 6,000 m, the
pressure sensor is out of order. Consult the retailer from whom
it was purchased.

**

28

Problem Possible cause Solution

The watch calculates decompression
diving even after a dive.

**The log data stored in the dive log function will not be erased when the battery is replaced with a new one. If any malfunction is found during

checking, however, the stored log data may be erased when the watch is repaired. It is recommended that the log data in memory be noted down
in your log book before requesting a battery change.

The diver ascended defying the
decompression stop violation warning.

When the surface interval time is less than 5 minutes, making a
decompression stop as indicated by the watch will return the
display for no-decompression diving.

SPECIFICATIONS

English

1 Frequency of crystal oscillator ... 32,768 Hz (Hz = Hertz … Cycles per

2 Loss/gain (Monthly rate) ............ Less than 15 seconds at normal

3

Operational temperature range

second)

temperature range (5° C ~ 35° C)
(41° F ~ 95° F)

... –5° C ~ +40° C (23° F ~ 104° F) for

depth measurement, alarm sound,
display and illuminating light

–10° C ~ +60° C (14° F ~ 140° F) for
timing function

* In very low temperatures, the

display light may dim, and the
change of digits may become slow.

DIVE LOG display ................. Log No., date of dive, dive time,

HOUR CORRECTION display ..

Dive mode ............................ No-decompression limit, dive time,

5 Display medium ......................... Nematic Liquid Crystal, FEM (Field

4 Display system

TIME/CALENDAR display ..... Hour, minutes, seconds, month,

REGULAR ALARM display .... Regular alarm time (hour and

FO

2 (NITROX) display ............ FO2 setting

DIVE PLAN display ............... Depth rank and no-decompression

date, and day [surface interval time
and desaturation time]

minutes)

limit [surface interval time and
desaturation time]

6 Battery ....................................... SEIKO CR2032, 1 piece

7 Battery life ................................. Approx. 3 years

8 Illuminating light ......................... Electroluminescent panel

9 Sensor accuracy ......................... Depth: Within ± 3% of the displayed

10

IC (Integrated Circuit) ................. C-MOS-LSI, 2 pieces

* The specifications are subject to change without prior notice for product improvement.

entry/exit time, FO
depth, maximum depth, water
temperature at maximum depth,
and residual nitrogen/oxygen at end
of dive

2 setting, average

Hour and minutes

current depth, maximum depth,
water temperature, residual
nitrogen, FO
PO

2 setting, current time,

2 value and residual oxygen

Effect Mode)

value + 0.5 m (2 ft)
Water temperature: ±2° C (4° F)

Non-volatile memory, 1 piece

29