Seiko Watch 7K52 User Guide

Ca l. 7 K5 2  
INSTRUCTIONS  
(P.  
3)  
BEDIENUNGSANLEITUNG  
INSTRUCTIONS  
ISTRUZIONI  
(S. 33)  
(P. 63)  
(P. 93)  
(P. 125)  
(P. 155)  
(185 )  
INSTRUCCIONES  
INSTRUÇÕES  
用法説明  
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CAUTION  
The SEIKO SCUBA DIVER’S Cal. 7K52 is intended for use in an  
inherently hazardous form of recreation. Therefore, it is  
absolutely essential that you observe strictly all instructions  
for the use and maintenance of the watch set forth in this  
booklet.  
First of all, this watch is for use by adults only in recreational  
(no-decompression) diving in water having a specific gravity  
of 1.025 (sea water), having a temperature range of 0° C to 40°  
C, and is not for decompression diving, saturation diving or  
diving at altitudes (diving in a high mountain lake, etc.). Unless  
you have undergone scuba training with a qualified instructor,  
you can neither fully appreciate the concept of no-  
decompression limits nor properly employ the watch.  
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3
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.  
When making a dive, use other diving instruments such as dive  
computers together with this watch for safety’s sake.  
Finally, all of the diving measurements made by the watch and  
warning functions of the watch, outlined herein, are to serve as  
general guidelines only, and individual reactions will differ  
from person to person.  
4
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CONTENTS  
Page  
HOW TO USE THE SCREW LOCK TYPE CROWN .....................................................  
TIME/CALENDAR SETTING ........................................................................................  
ADJUSTING THE HAND POSITION BEFORE DIVING................................................  
DIVING MEASUREMENT ...........................................................................................  
WARNING FUNCTION FOR DIVING ...........................................................................  
RECALL OF LOG DATA ..............................................................................................  
ROTATING BEZEL ......................................................................................................  
SINGLE-TIME ALARM ................................................................................................  
PRECAUTIONS FOR DIVING ......................................................................................  
NOTES ON USING THE WATCH ................................................................................  
BATTERY LIFE INDICATOR ........................................................................................  
BATTERY CHANGE .....................................................................................................  
HOW TO USE THE DIVER EXTENDER .......................................................................  
SPECIFICATIONS........................................................................................................  
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9
10  
11  
14  
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18  
19  
20  
23  
27  
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30  
31  
For the care of your watch, see “TO PRESERVE THE QUALITY OF YOUR  
WATCH” in the attached Worldwide Guarantee and Instruction Booklet.  
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5
CAL. 7K52  
DIVING MEASUREMENT  
Full automatic measurement of diving data  
Current depth, maximum depth, diving time and time submerged  
Recording of log data  
Maximum depth, average depth, diving time and time submerged for the last two dives  
Warning functions  
• Rapid ascent warning  
• Extra measurement range warning  
• Abnormal measurement warning  
Rotating bezel  
Can measure elapsed time such as diving time, surface interval, etc.  
Battery life indicator  
SINGLE-TIME ALARM  
Can be set to ring only once at a designated time within the coming 12 hours.  
TIME/CALENDAR  
Hour, minute and small second hands and date  
6
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Rotating bezel  
1/10 m hand  
Minute hand  
Hour hand  
B
A
C
a b  
c
d
Water contact sensor  
Small second hand  
CROWN  
[Screw lock type]  
DIVING TIME hand  
DEPTH hand  
Date  
MAX. DEPTH hand  
Time submerged  
Alarm time  
Pressure sensor is  
located under here.  
a: Screwed-in position  
b: Normal position  
c: First click  
d: Second click  
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7
HOW TO USE THE SCREW LOCK TYPE CROWN  
To unscrew the crown:  
To screw in the crown:  
With the crown at normal position,  
turn it clockwise while pressing it.  
Turn it counterclockwise.  
WARNING  
While you are underwater, never unscrew the crown or pull it out.  
Do not pull out the crown to the first click while the watch is measuring the depth  
and for 10 minutes after diving. Otherwise, the depth measurement is stopped,  
and false data will be recorded in memory as log data.  
8
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TIME/CALENDAR SETTING  
Hour hand  
Minute hand  
CROWN  
Unscrew.  
Pull out to first click and turn counter-  
clockwise to set the date.  
Pull out to second click when small  
second hand is at the “0” position.  
Set hour and minute hands.  
Date  
Press to set small hour and minute  
hands to the time set above.  
A
A
CROWN  
Small  
second hand  
Small hour and  
minute hands  
Push in in accordance with a time  
signal.  
Screw in completely.  
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9
ADJUSTING THE HAND POSITION BEFORE DIVING  
Press repeatedly until you hear a long beep.  
B
With each press of button B, the indication of the diving hands changes as follows:  
Diving hands at  
“0” position  
Log data of  
the last dive  
Log data of the  
dive before last  
(Beep, beep)  
(A long beep)  
(Beep)  
If any of the hands does not return to “0” position, follow the procedure below.  
DEPTH hand  
1/10 m hand  
CROWN  
DIVING  
TIME  
hand  
MAX. DEPTH hand  
Unscrew, and pull out to second click when  
small second hand is at the “0” position.  
Press to reset the DIVING TIME hand to  
B
B
“0” position.  
C
Press to reset the 1/10 m, DEPTH and  
MAX. DEPTH hands to “0” position.  
C
CROWN  
Set the current time. (See “TIME/CALEN-  
DAR SETTING)  
Push in in accordance with a time signal,  
and screw in completely.  
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10  
DIVING MEASUREMENT  
The watch measures the current depth, maximum depth, diving time and time submerged,  
and indicates them with the four hands for diving measurement and the small hands at the 6  
o’clockposition.  
HOW TO READ THE MEAS UREMENTS  
Current depth: Indicated by DEPTH and 1/10 m hands  
in 0.1 m increments from 1.6 m up to  
55.0 m. (Ex. 12.5 m)  
Maximum depth: Indicated by MAX. DEPTH hand  
in 0.5 m increments from 1.5 m up  
to 55.0 m. (Ex. 20.5 m)  
Diving time: Indicated by DIVING TIME hand up to  
12 hours.  
(Ex. 17 minutes)  
Time submerged: Indicated by small hands at the 6  
o’clock position. (Ex. 10:10)  
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11  
HOW TO US E THE DIVING FUNCTION  
Before diving, check the hands  
for diving measurements.  
Press button B repeatedly.  
Log data  
Log data of Diving hands  
of the  
the dive  
at “0”  
last dive  
before last  
position  
0.0 m  
1.6 m  
Diving measurement starts when  
you descend to 1.6 m or more.  
Never operate the crown while  
the measurement is in progress.  
55.0 m  
12  
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Case I  
Case II  
Diving measurement stops when  
you ascend to less than 1.6 m.  
Rapid ascent warning !  
Case I  
:
If you stay at less than 1.6 m underwater  
for more than 10 minutes, the dive is  
considererd to be completed.  
Case II : If you descend again to 1.6 m or more  
underwater before 10 minutes have  
elapsed, the two dives are considered  
inseparable, and the measurement is  
resumed.  
Extra measurement range warning !  
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13  
Before starting a dive, be sure to check that the hands for diving measurement are reset to “0” position.  
If not, reset them following the procedure in “ADJUSTING THE HAND POSITION BEFORE DIVING”.  
When you ascend to a depth less than 1.6 m underwater and the watch stops measuring the depth,  
the DEPTH and 1/10 m hands indicate “0.0 m”.  
If you descend again to a depth of 1.6 m or more underwater before 10 minutes have elapsed, the time  
elapsed after the depth measurement is stopped is added to the measured diving time.  
For 10 minutes after a dive, all the three buttons will not work.  
After 10 minutes have elapsed following a dive, recall of log data is made possible by pressing button  
B.  
WARNING FUNCTION FOR DIVING  
RAP ID AS CENT WARNING  
The watch monitors the change of depth at 10 second intervals and gives a warning if  
the diver ascends more than 3 m in 10 seconds, that is, at a rate of more than 18 m per  
minute.  
Beep  
Beep  
Warning sound beeps intermittently for  
about 10 seconds and 1/10 m hand  
moves back and forth.  
14  
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CAUTION  
The rapid ascent warning is given whenever the diver’s ascent rate is beyond the  
specified criterion. The extent of hazardousness, however, varies depending on the  
water temperature and the diver’s physical condition. Please note that the warning  
serves only as a guideline for your diving activities.  
EXTRA MEAS UREMENT RANGE WARNING (LIMIT)  
If the measured depth exceeds 55.0 m, the  
DEPTH and MAX. DEPTH hands point to  
the 56-minute position, “LIMIT”.  
LIMIT”  
position  
* If the diver returns to a depth of 55.0 m or less,  
the DEPTH hand indicates the depth properly.  
ABNORMAL MEAS UREMENT / MEAS UREMENT HALT WARNING  
If the watch senses an abnormality in depth measurement, the diving measurement is  
automatically halted.  
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The DEPTH hand points to the 58-minute  
position and the MAX. DEPTH hand  
points to 0 m.  
CAUTION  
If the watch gives the above warning, do not continue to use the watch for diving  
measurement.  
16  
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RECALL OF LOG DATA  
The watch retains data for two dives, namely, time submerged, diving time, maximum depth  
and average depth.  
*Log data cannot be recalled while diving and for 10 minutes after diving.  
Press to recall the log data.  
B
With each press of button B, recall of the log data and checking of the hand positions are  
made in the following order.  
Log data of  
Log data of the  
dive before last  
Diving hands at  
“0” position  
the last dive  
(Beep, beep)  
(A long beep)  
(Beep)  
Average depth  
B
Diving time  
Maximum depth  
* If the single-time alarm has  
been engaged, it is canceled  
by pressing button B.  
Time submerged  
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17  
ROTATING BEZEL  
The rotating bezel can show up to 60 minutes of elapsed time.  
It is useful for measuring the surface interval.  
1
Turn the rotating bezel to align  
2
Read the number on the rotating  
bezel that the minute hand points  
to.  
its “  
” mark with the minute  
hand.  
Start  
20 minutes  
have elapsed.  
Elapsed time  
* The rotating bezel turns only counterclockwise for safety’s sake.  
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18  
SINGLE-TIME ALARM  
The alarm can be set to ring once within the coming 12 hours.  
While on the surface, the small hands at the 6 o’clock position serve as alarm hands.  
*While you are at a depth of 1.6 m or more underwater and for 10 minutes after a dive, the single-time  
alarm function cannot be used.  
ALARM TIME S ETTING  
Press to reset the hands for diving  
measurement to “0” position.  
B
B
Set the alarm time.  
A
* At the designated time, the alarm rings for 20  
seconds and is automatically disengaged.  
To stop the alarm manually:  
Press any of the buttons.  
A
To cancel the alarm:  
Press button B to recall the log data, or press  
Small hour and minute hands  
and hold button A until the small hands indicate  
the current time.  
Ex.: Alarm time is set at “10:30”.  
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PRECAUTIONS FOR DIVING  
BEFORE DIVING  
Check that:  
• the watch operates normally.  
• the crown is locked tightly in place.  
• there are no visible cracks in the crystal or the watch band.  
• the strap or bracelet is securely fastened to the watch case.  
• the buckle keeps the strap or bracelet firmly secured to the wrist.  
• the time and date are properly indicated.  
• the small second hand is moving at one-second intervals.  
• the log data of the previous two dives is recalled properly.  
• all the hands for diving measurement are reset to “0” position.  
While the small second hand is moving at two-second intervals, or when the DEPTH hand  
points to the 58-minute position after all the hands are reset to “0” position, the watch will  
not measure the depth. In these cases, replace the battery with a new one. (See “BATTERY  
LIFE INDICATOR”)  
If there are any malfunctions, do not use the watch for diving. We recommend that you  
contact an AUTHORIZED SEIKO SERVICE CENTER.  
If the temperature of the water is much lower than the air temperature (for example, if the  
watch is put into water after it is left in direct sunlight for a long time), the watch may not  
measure the depth accurately. In this case, soak the watch in water for approximately 5  
minutes before starting to dive.  
If the watch is used in places where atmospheric pressure or temperature changes sharply,  
20  
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or in temperatures outside the operational temperature range for depth measurement (0°  
C to 40° C or 32° F ~ 104° F), the depth measurement may be inaccurate, and depths greater  
than 1.6 m may be displayed even while the diver is on the surface, resulting in endless  
depth measurement and buttons which no longer operate. If this occurs, unscrew the crown  
and pull it out to the first click to manually stop the measurement.  
*Measurement details are recorded as abnormal measurement. (See “Abnormal measurement/  
measurement halt warning” in “NOTES ON USING THE WATCH”) After the measurement is stopped,  
push in the crown and screw it in completely.  
By making a new dive, the older of the two log data in memory will be erased. Before diving,  
therefore, it is recommended that you make a note of the stored data in your log book, etc.  
WHILE DIVING  
Use the watch only within the operational temperature range for depth measurement (0° C  
~ 40° C or 32° F ~ 104° F).  
Take care not to hit the watch against hard objects such as rocks.  
While you are underwater, never unscrew the crown or pull it out.  
Check that the DEPTH hand moves properly.  
While you are at a depth of 1.6 m or more underwater, the alarm will not ring so that it is  
not confused with the beeping sound for the rapid ascent warning.  
The depth measurement is made every second except while the DEPTH hand is moving.  
While the watch is giving the rapid ascent warning, it will not measure the depth. In some  
cases, however, the watch stops the warning momentarily to indicate the depth and then  
resumes the warning.  
Depending on the aquatic environment where the watch is used, the beeping sound for the  
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21  
rapid ascent warning may or may not reach your ears.  
If you find the DEPTH hand indicating the 58-minute position while you are underwater, you  
should either ascend to the surface immediately or, if you choose to remain underwater, not  
depend on diving information provided by the watch.  
The watch measures the depth of water on the basis of seawater having a specific gravity  
of 1.025. When it is used in fresh water such as lakes, therefore, the displayed depth should  
be corrected by multiplying it by 1.025.  
Ex. Assuming that the gravity of the lake where you are diving is 1.00  
If the watch indicates 29.2 m, the actual depth is:  
29.2 m x 1.025/1.00 = 30.0 m  
While you are underwater, none of the buttons will work for safety’s sake.  
AFTER DIVING  
After making a dive, be sure to rinse the watch in fresh water, and wash out all seawater,  
soil, sand, etc. If dust forms between the case and rotating bezel, the pressure sensor will  
not function properly.  
Be sure to wash out soil, etc. sticking to the water contact sensor unit, as this will cause a  
malfunction.  
After cleaning the watch in fresh water, be sure to wipe it thoroughly dry to prevent possible  
rust on the case.  
If soil, sand, etc. stick in the sensor unit and cannot be washed out, take your watch to the  
retailer from whom the watch was purchased or an AUTHORIZED SEIKO DEALER or  
SERVICE CENTER.  
Be careful not to expose the watch to solvents such as alcohol and gasoline, as this may  
cause a malfunction of the sensors.  
22  
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NOTES ON USING THE WATCH  
TIME/CALENDAR SETTING  
Do not set the date between 9:00 p.m. and 1:00 a.m. Otherwise, the date may not change properly.  
Be sure to set the time hands and the small hands at the 6 o’clock position accurately to the current  
time as the time submerged recorded as log data is based on the time the small hands indicate.  
By pulling out the crown to the second click, the time hands stop moving, and the small hour and  
minute hands indicate the current time and stop. The hands for diving measurement are reset to the  
“0” position.  
When setting the hour hand, check that AM/PM is correctly set. The watch is so designed that the  
date changes once in 24 hours.  
When setting the minute hand, advance it 4 to 5 minutes ahead of the desired time and then turn it  
back to the exact time.  
The small hour and minute hands advance quickly if button A is kept pressed.  
It is necessary to adjust the date at the end of February and 30-day months.  
ADJUSTING THE HAND POSITION BEFORE DIVING  
The hands move quickly if the respective buttons are pressed.  
The MAX. DEPTH hand moves only when it is pushed by the DEPTH hand from the clockwise direction.  
With each press, the 1/10 m hand advances by 1/4 of a graduation. When the DEPTH hand nears “0”  
position, the 1/10 m hand is hidden behind it. Count the number of presses of button C required to  
reset the 1/10 m hand to “0” before it is completely hidden.  
Do not press buttons B and C at the same time.  
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23  
DIVING MEASUREMENT  
How to read the measurements  
The time submerged is the time when you descend to a depth of 1.6 m or more underwater, and the  
diving time measurement starts at the same time.  
The time submerged is indicated in the 12-hour indication without showing AM/PM.  
The diving time can be measured and indicated for up to 12 hours, but it is only recorded for up to 2 hours  
as the log data in memory.  
The DIVING TIME hand moves at 1/5-minute intervals, but the scale is graduated in minutes.  
Do not press buttons B and C at the same time.  
How to use the diving function  
Even if you have never made a dive using the watch, log data of two dives is prerecorded in memory  
for checking purposes.  
If you start a dive without resetting the hands to “0” position, they automatically return to “0”  
position as the watch starts measuring and then move to indicate the depth and diving time.  
However, you cannot check the current depth all this while, so therefore be sure to reset the hands  
to “0” position before diving.  
WARNING FUNCTION FOR DIVING  
Rapid ascent warning  
If the diver ascends so fast that the DEPTH hand cannot move exactly in accordance with the actual  
change of depth, the 1/10 m hand does not move back and forth but alternately moves and stops  
as a warning.  
Extra measurement range warning  
If a depth of more than 55.0 m is measured, the log data recorded in memory will be as follows:  
24  
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• Maximum depth : The MAX. DEPTH hand indicates the 56-minute position.  
• Average depth The DEPTH hand indicates the 56-minute position.  
:
• Time submerged and diving time are recorded as measured.  
Abnormal measurement / measurement halt warning  
If the watch senses an abnormality while measuring the depth, the log data recorded in memory will  
be as follows:  
• Maximum depth : The MAX. DEPTH hand indicates “0” position.  
• Average depth  
:
The DEPTH hand indicates the 58-minute position.  
• Time submerged and diving time measurements are also abnormal, and the recorded data should  
not be considered reliable.  
RECALL OF LOG DATA  
When log data is recalled by pressing button B for the first time when 10 minutes have elapsed after  
diving, the data newly recorded is recalled. At this time, only the DEPTH hand moves to indicate the  
average depth, as the other hands are already indicating the data just obtained.  
The time submerged is indicated in the 12-hour indication without showing AM/PM.  
The time submerged is retained in memory even if a time adjustment is made.  
The watch measures the diving time for up to 12 hours, but, in recalling the log data, up to 2 hours are  
indicated. To show the time beyond 1 hour, the DIVING TIME hand makes another revolution.  
Remarks on the indication of MAX.DEPTH and DEPTH hands  
When both the MAX. DEPTH and DEPTH hands point to the 56-minute position:  
This indicates that a depth of more than 55.0 m is measured during the dive and that the maximum  
and average depths cannot be calculated. The time submerged and diving time are recorded  
properly.  
When the MAX. DEPTH and DEPTH hands point to “0” and the 58-minute positions, respectively:  
This indicates that the watch senses an abnormality in depth measurement during the dive.  
Measurement of the time submerged and diving time are also abnormal.  
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25  
SINGLE-TIME ALARM  
When button B is pressed to reset the hands for diving measurement, check that the small hands at  
the 6 o’clock position indicate the current time.  
While you are at a depth of 1.6 m or more underwater and for 10 minutes after a dive, the single-time  
alarm function cannnot be used.  
The small hour and minute hands advance quickly if button A is kept pressed.  
Do not recall the log data while the alarm is engaged. Otherwise, the small hands at the 6 o’clock  
position move to indicate the time submerged and the alarm time you have set is automatically  
canceled.  
The alarm time you have set is also canceled automatically when the watch is used for diving.  
26  
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BATTERY LIFE INDICATOR  
When the battery nears its end, the small second hand moves at two-second intervals  
instead of the normal one-second intervals. In that case, the watch will stop operating  
in 2 to 3 weeks. Replace the battery with a new one as soon as possible.  
* While the small second hand is moving at two-second intervals, the watch remains accurate but the  
alarm will not ring.  
While the small second hand is moving at two-second intervals, do not use the watch  
for diving, as the watch does not measure the depth.  
When the battery nears its end, the DEPTH hand  
indicates the 58-minute position when button B is  
pressed to reset the hands for diving measurement  
to “0” position.  
* When the log data is displayed, however, the DEPTH hand  
does not indicate the 58-minute position.  
BATTERY CHANGE  
The miniature battery which powers your watch should last approximately  
2 years. However, because the battery is inserted at the factory to check  
2
the function and performance of the watch, its actual life once in your  
Years  
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. For  
battery replacement, we recommend that you contact an AUTHORIZED  
SEIKO DEALER and request SEIKO CR2016 battery.  
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27  
* For safety’s sake, the watch will also undergo a strict check at the time of battery replacement. In  
addition to battery replacement, water resistant quality of the watch and the depth measurement  
function will be checked. The gasket will be replaced with a new one if necessary. Therefore, it  
will take approximately 10 days before the watch is returned to you, and the checking may be made  
at cost.  
* The battery life may be less than 2 years if the alarm is used more than 15 seconds a day, and/or  
the depth measurement function more than 50 times a year, one hour per dive.  
* When the battery is replaced with a new one, or when it runs down, the log data will be erased from  
memory.  
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.  
28  
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Necessary procedure after battery change  
When the battery is replaced with a new one or when the watch hands move improperly, follow the  
procedure below. The IC is reset and then the watch operates normally.  
* The log data stored in memory will be erased by following the procedure below.  
Pull out Crown to the second click and press buttons  
B and C at the same time.  
C
B
Before using the watch:  
Set the time and date.  
Press button B to recall the log data.  
The following data will be displayed.  
Diving time  
Maximum depth  
Average depth  
Time submerged  
DATA 1  
DATA 2  
15 minutes  
30 minutes  
20 m  
40 m  
10.0 m  
20.0 m  
Time randomly selected  
Time of DATA 1 plus 6 hours  
* If the above data are not properly indicated, the watch may be out of order. Contact the retailer from whom  
the watch was purchased or an AUTHORIZED SEIKO DEALER.  
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29  
HOW TO USE THE DIVER EXTENDER  
Upper cover  
Flap  
Clasp  
2
12 o’clock  
side  
1
6 o’clock  
side  
Two-piece  
foldover portion  
To extend the band length  
1 Lift up the flap.  
2 Press the button to open the clasp.  
* Then, push the flap back to the normal position for  
safety’s sake.  
3 Pull the two-piece foldover portion until it clicks  
loose.  
4 Slide the upper cover in the direction of the  
arrow, and then,  
3
5
4
5 pull it up to extend the two-piece foldover  
6
portion to the full.  
Approx. 2 cm  
6 Close the clasp, and then, the flap.  
To change back the band length  
Fold the two-piece foldover portion, and hook the  
upper cover on to the shaft of the flap. Then, pull  
the bracelet hard until the two-piece foldover  
portion fixed in position.  
30  
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SPECIFICATIONS  
1
2
Frequency of crystal oscillator ................... 32,768 Hz (Hz = Hertz ... Cycles per second)  
Loss/gain (monthly rate) ............................. Less than 15 seconds at normal temperature range (5° C  
~ 35° C) (41° F ~ 95° F)  
3
Operational temperature range .................. –10° C ~ +60° C (14° F ~ 140° F)  
0° C ~ +40° C (32° F ~ 104° F) for water depth  
measurement function  
4
5
Driving system ........................................... Step motor, 4 pieces  
Display system  
TIME/CALENDAR display ....................... Hour, minute and small second hands and date  
DEPTH MEASUREMENT display ............ Current depth by DEPTH hand and 1/10 m hand  
Maximum depth by MAX. DEPTH hand (in 0.5 m  
increments)  
Diving time by DIVING TIME hand (in 1/5 minute  
increments)  
Time submerged by the small hour and minute hands at  
the 6 o’clock position  
LOG DATA display .................................. Stores details of two dives.  
Maximum depth by MAX. DEPTH hand (in 0.5 m  
increments)  
Average depth by DEPTH hand and 1/10 m hand  
Diving time by DIVING TIME hand (in 1/5 minute  
increments)  
Time submerged by the small hour and minute hands at  
the 6 o’clock position  
ALARM display ....................................... Small hour and minute hands at the 6 o’clock position  
• While disengaged  
• While engaged  
:
:
Current time  
Designated alarm time  
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31  
Accuracy of the alarm: ±1 minute  
6
7
Battery ....................................................... Miniature lithium battery SEIKO CR2016, 1 piece  
Battery life: approx. 2 years  
Battery life indicator ................................... When the battery life nears its end, the small second hand  
moves at 2-second intervals and the DEPTH hand points  
to the 58-minute position before diving.  
8
9
IC (Integrated Circuit) ................................. C-MOS-LSI, 2 pieces  
Semiconductor pressure sensor, 1 piece  
Accuracy of sensors  
Water depth ............................................ Within ±(Indicated value x 3.0% + 0.5 m) at a stable  
temperature  
[Influence of temperature change]  
Within ±1 m for a temperature change of 20° C  
10 Magnetic resistance ................................... 4,800 A/m (60 gauss)  
11 Water resistance ........................................ Withstands water pressure to a depth of 200 m and is  
therefore suitable for scuba diving.  
12 Safety design ............................................. The case, bracelet and buckle are rounded to prevent  
damage to the diving suit or user’s skin.  
* The specifications are subject to change without prior notice for product improvement.  
32  
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