User Manual

2385-3
HELPFUL HINTS ON DEPTH MEASUREMENT FUNCTIONS
About depth and water pressure
Water pressure increases with depth. In the case of sea water (specific gravity = 1.025),
water pressure increases by 1 ATM (1.03kg/cm
2
) with each 10 meters (33 ft.) of depth.
This watch makes use of the relationship between pressure and depth, using a pressure
sensor to calculate the water pressure and then converting this data into depth readings.
Measurement formats and ranges
• Submerged time: measured in 1-second increments
Display range: up to 5 hours, 59 minutes and 59 seconds
• Depth: measured in 0.1-meter (1-ft.) increments
Display range: between 0 and 50 meters (0 and 164 ft.)
Note that depths between 0 and 1 meter (0 and 4 ft.) are registered as
“0.0 M (0 F)”.
Present/Maximum depths show “FULL” when 50 meters (164 ft.) is
exceeded.
Reading frequency: every 3 seconds
Operation of pressure sensor and “0 M (0 F)” reset
When the Depth Measurement Mode is entered, the built-in sensor immediately
begins to operate. When you submerge past the 1-meter (4-foot) point, the sensor
automatically begins making depth readings and triggers the time to measure the
submerged time.
Normally, you should select the Depth Measurement Mode immediately before
beginning a skin diving/snorkeling.
Automatic “0 M (0 F)” reset
When the Depth Measurement Mode is entered, the present depth reading is set at
“0 M (0 F)” (even if you are underwater at a different pressure). Because of this,
avoid switching to the Depth Measurement Mode while underwater.
Manual “0 M (0 F)” reset
In some cases, such as when the sensor is exposed to
wide changes in temperature, the display may show a
depth of greater than 1.0 M (4 F) even when you are on
the surface. In this case, it is necessary to reset the
pressure to “0 M (0 F)”.
By pressing holding down C and D together for at least 1
second, the pressure reading can be reset to “0 M (0 F)”.
Always perform the above operation on land or on a boat.
Do not perform it while in the water.
Calculation of standard value and absolute value
Whenever the sensor value exceeds the standard values
listed below during a skin diving/snorkeling, operation
automatically switches to show the absolute water
pressure. At this time, a warning mark “ ! ” appears on the
display.
Standard value: 1.24kg/cm
2
(bars absolute) at 25°C (77°F)
• Bars absolute 2 meters (7 ft.) below the surface of the sea water (gravity 1.025) with
standard atmosphere at 25°C (77°F)
Absolute water pressure: Depth of 0 meters (0 ft.) measured at 25°C (77°F) with a
bars absolute of 1.033kg/cm
2
.
Forced Exit from Depth Measurement Mode
When the depth display shows a depth of 1.0 M (4 F) or more, operation cannot be
switched from the Depth Measurement Mode to the Timekeeping Mode by holding
down C. If it becomes necessary to switch to the Timekeeping Mode during a dive
(when the watch is used in environments where temperature varies widely from the
suggested operating temperature range), you can do so by holding down A, B, C,
and D for at least two seconds.
Note
Avoid forcing an exit from the Depth Measurement Mode under normal conditions.
Weak Battery Power
The message “HELP” appears on the display or the display starts to flash to let you
know that batteries are getting weak. While this happens, sensor measurements are
not operational, so be sure to have the batteries replaced as soon as possible.
Notes
• Do not use the watch for skin diving or snorkeling until the batteries have been
replaced.
• No Depth Measurement Mode measurement is available while the low battery
message is shown on the display.
• Be sure to have the batteries replaced at least once every two years.
• When you notice that the batteries are weakening, have the batteries replaced by
the store or dealer where you purchased the watch.
< Depth Measurement Mode (submerged) > < Other Modes (on the surface) >
Display flashing
Depth Reading Errors
In some cases, due to operational errors or abnormal environmental conditions, the
display may indicate incorrect depth readings (such as –1.0 M (–4 F), etc.).
These readings may occur when:
— the watch is exposed to abnormal changes in temperature (such as when it is
suddenly submerged after being exposed to direct sunlight for an extended period) or
air pressure.
— the depth reading is inadvertently set to “0 M (0 F)” while underwater (depth = 1 to
2 meters/4 to 7 ft.)
In such cases, a depth measurement error occurs and the message “Error” appears
on the display for three seconds, followed by a warning mark “ ! ”. Most of the time,
depth errors occur on the surface, and so the reading is automatically reset to “0.0
M (0 F)” after the error display.
Note that appearance of the warning mark indicates a large error in the displayed
data, and so such data should be disregarded.
Note
Depth reading errors are not caused by malfunction, and normal depth
measurement can be carried out after resetting the depth to 0 M (0 F). The
related data, however, should not be relied on. Because of this, always switch
first to the Timekeeping Mode and then back to the Depth Measurement Mode
before continuing your skin diving/snorkeling if a depth reading error occurs.
Depth reading error message indicates that log data is incorrect.
Automatic 0 reset is performed even after the appearance of a depth reading error
message. Measurements and log data storage into memory are performed normally,
but the “ ! ” mark remains on the display.
Sensor Error Detection
If your watch is subjected to extremely strong impact, the sensor may malfunction in
the Depth Measurement Mode. In this case, a “SENSOR Error” message will appear
along with the warning mark “ ! ” indicating incorrect data.
If a sensor error occurs, do not use your watch during skin diving/snorkeling.
Whenever you have a sensor malfunction, be sure to take the watch back to the
store or dealer where you purchased it.
NOTES ON OPERATION
Wide variations in temperature
In some cases, when this watch is exposed to widely varying temperatures, correct
pressure measurement may become impossible.
Examples:
• Watch is exposed to direct sunlight for an extended period.
• Watch is stored in an automobile exposed to direct sunlight for an extended period.
If the watch has been exposed to high temperatures, cool it at water temperature for 2
to 3 minutes before using it.
If the watch is subjected to large temperature variations, the display may show a
depth of 1.0 M (4 F) or greater even at sea level, or other depth measurement errors
may be generated.
Wide variations in depth
As depth readings are made every three seconds, the depth reading may differ from
the actual depth in cases where sudden changes in depth are made.
High-altitude skin diving/snorkeling and Fresh-water skin diving/
snorkeling
The depth reading is automatically reset to “0 M (0 F)” whenever the Depth
Measurement Mode is entered, so you can use this watch for skin diving at altitudes.
Note, however, that malfunctions occur when skin diving at altitudes greater than
approximately 4,000 meters (13,000 ft.). In addition, as this watch bases its
calculations on sea water, which has a specific gravity of 1.025, readings will be
incorrect during fresh-water skin diving. During fresh-water dives, you must assume
that you are approximately 2.5% deeper than the depth shown on the display.
Example: When displayed depth is 5 meters, actual depth is
5 × 1.025 = 5.1 meters.
BACKLIGHT PRECAUTIONS
In any mode, press L to illuminate the display for about two seconds.
• The illumination provided by the backlight may be hard to see when viewed under
direct sunlight.
• The battery that powers the backlight is different from the battery that powers other
watch operations.
• Frequent use of the backlight shortens the battery life.
• The backlight of this watch illuminates the analog face only.