Casio 2172 User Manual
MO0403-B
Module No. 2172
GETTING ACQUAINTED
Congratulations upon your selection of this CASIO watch. To get the most out
of your purchase, be sure to carefully read this manual and keep it on hand
for later reference when necessary.
About this manual
• Button operations are indicated using the
letters shown in the illustration.
630
20 00
05
1
5
0
Snorkeling/Scuba Diving Precautions
• Make sure that you have received proper diving training before using
this watch underwater.
• Always use the “buddy system” when diving. Never dive alone.
• Note that this watch is NOT a diving computer, and is not capable of
making decompression calculations.
• The depth meter function built into this watch should only be used as
a “back-up” to your standard depth gauge.
• Note that this watch cannot be used in helium atmospheres.
• Though the function of this watch is not affected by magnetism, long
use near a source of magnetism can case the watch itself to become
magnetized. A magnetized watch can interfere with the precision of
readings produced by an underwater compass. To avoid such
problems, keep the watch away from your compass when taking
readings.
Before Diving
• Before beginning each dive, check to make sure that the BATT (and/
or RECOVER) message (which indicates that battery power is weak)
and/or ERR message (which indicates sensor malfunction) are not on
the display. If either message is on the display, contact an authorized
CASIO Dealer/Distributor or authorized CASIO Service Point to have
the battery replaced or to have the watch repaired.
• Make sure that the current time setting of the watch is correct.
• Check the glass, case, and band for cracks or chips.
• Make sure that the band is fastened securely around your wrist.
While Diving
• Check to make sure that the timer and depth gauge are operating
properly.
• Warning indicators flashing on the display indicate the possibility of
a data error. For details, see “Warning Indicators”.
• Take care when diving near rocks or coral to avoid scratching or
damaging the watch.
After Diving
• To avoid corrosion, rinse your watch thoroughly with fresh water to
remove salt water, dirt, etc. When possible, soak the watch in fresh
water overnight to make sure that all salt is removed.
• When using a metal band, occasionally clean the gaps in the band
using a soft toothbrush and soapy water. Failure to keep a metal
band clean can result in corrosion of the watch, soiling of clothing, or
irritation of sensitive skin.
CASIO COMPUTER CO., LTD. assumes no responsibility for any
loss, or any claims by third parties that may arise through the use of
this watch.
• Each section of this manual provides you
with the information you need to perform
operations in each mode. Further details
and technical information can be found in
the “REFERENCE” section.
2172-1
GENERAL GUIDE
For information on how to read the display, refer to the separate instructions
on each function.
Timekeeping Mode
Time/Date
630
20 00
05
1
5
0
▲
Hold down C
for two seconds.
▲
Diving Mode
000
10 58
00
2
4
Alarm Mode
10 58
20
1
Day of week
05
1
Hour : Minutes
AM indicator
Month – Day
630
20 00
5
Year
0
Seconds
To set the time and date
630
20 00
05
1
5
0
Seconds
DST Hour
Press D.
▲
▲
TIMEKEEPING
Use the Timekeeping Mode to set the current
time and date, and to view the current time.
You also can adjust the display contrast while
in the Timekeeping Mode.
To reset the seconds count to zero
1. In the Timekeeping Mode, hold down A
until the seconds digits start to flash, which
indicates the setting screen.
2. Press D to reset the seconds count to
• Pressing D while the seconds count is in
the range of 30 to 59 resets the seconds to
00 and adds 1 to the minutes. In the range
of 00 to 29, the minutes count is
unchanged.
3. Press A twice to exit the setting screen.
1. In the Timekeeping Mode, hold down A
until the seconds digits start to flash, which
indicates the setting screen.
• While the seconds digits are flashing, press
D to set the seconds count to
2. Press C to move the flashing in the
sequence shown below to select other
settings.
Minutes
Temperature
▲
05
1
Recall Mode
82
Dive Profile Mode
82
12/24-Hour
format
500
500
630
300
▲
10 58
11 58
▲
10 58
11 58
5
0
Press C.
x
3
x
3
00.
Year
00.
°C/°F M/F
• See “Daylight Saving Time (DST)” for details on the DST setting and
“Adjusting Display Contrast” for information about contrast.
3. Use C to move the flashing to the hour, minutes, year, month, and day,
and make the settings you want for each.
• While the hour, minutes, year, month, or day setting is flashing, use D (+)
and B (–) to change it.
• When the 12/24-hour setting is selected, press D to toggle between
1CL) and 24-hour (CZL) timekeeping.
12-hour (
Contrast
Day
Month
2172-2
4. Press A twice to exit the setting screen.
• The day of the week is automatically displayed in accordance with the date
(year, month, and day) settings.
• The year can be set in the range of 2000 to 2039.
• The watch’s built-in full automatic calendar automatically makes allowances
for different month lengths and leap years. Once you set the date, there
should be no reason to change it except after you have the watch’s battery
replaced.
Daylight Saving Time (DST)
Daylight Saving Time (DST) automatically advances the time setting by one
hour from Standard Time. Whether you should use Daylight Saving Time
depends on the geographic area where you are currently located.
To toggle between DST and Standard Time
1. In the Timekeeping Mode, hold down A
until the seconds digits start to flash, which
indicates the setting screen.
2. Press C to move the flashing to the DST
setting.
3. Press D to toggle between Daylight
Saving Time (
OFF).
(
4. Press A twice to exit the setting screen.
• The DST indicator appears on the display to
indicate that daylight saving time is turned
on.
ON) and standard time
15
1
630
20 00
5
0
Adjusting Display Contrast
Use the following procedure to adjust the relative darkness of the display
figures.
To adjust display contrast
1. In the Timekeeping Mode, hold down A
until the seconds digits start to flash, which
indicates the setting screen.
2. Press C eight times to move the flashing
to the contrast setting.
3. Use D (+) and B (–) to change the
contrast setting.
• You can set a value from
(darkest).
4. Press A twice to exit the setting screen.
0 (lightest) to 10
THERMOMETER
A built-in temperature sensor measures air temperature and water
temperature and the measurement result is shown on the display. You can
calibrate the temperature sensor if you suspect the temperature reading is
incorrect.
• See “DIVING FUNCTIONS” for information about the temperature display
in the Diving Mode.
• You can select either Celsius (°C) or Fahrenheit (°F) as the unit of
temperature measurement. See “To change the unit of temperature
measurement”.
ALARM
Hourly time signal
on indicator
Current time
10 58
20
1
Alarm time
3. Press C to move the flashing between the settings shown below.
4. While the hour or minutes setting is flashing, use D (+) and B (–) to
change it.
• When setting the alarm time using the 12-hour format, take care to set the
time correctly as am (A indicator) or pm (P indicator).
5. Press A to exit the setting screen.
Alarm on
indicator
Daily Alarm Operation
The alarm sounds at the preset time each day for about 20 seconds or until
you stop it by pressing any button.
• The alarm does not sound while the watch is in the Diving Mode.
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
To turn the Daily Alarm and Hourly Time Signal on and off
In the Alarm Mode, press D to cycle through the on and off settings as
shown below.
[Alarm ON Indicator / Hourly Time Signal ON Indicator]
Alarm On
Signal On
You can set a Daily Alarm that sounds at the
same time each day, while the alarm is turned
on. You can also turn on an Hourly Time
Signal that causes the watch to beep twice
every hour on the hour.
To set the alarm time
1. Use C to enter the Alarm Mode.
2. Hold down A until the hour digits of the
alarm time start to flash, which indicates
the setting screen.
• Displaying the alarm time setting screen
automatically turns on the Daily Alarm.
MinutesHour
Alarm Off
Signal Off
Alarm On
Signal Off
Alarm Off
Signal On
Interpreting the Temperature Screen
Temperature
630
300
05
1
5
0
• The displayed temperature value changes to
temperature falls outside the range of –10.0°C to 60.0°C (14.0°F to 140.0°F).
The normal temperature value reappears as soon as the measured
temperature is within the allowable range.
Use C to enter the Timekeeping Mode and
then press D to display the Temperature
screen.
• While a surface interval measurement is in
progress, pressing D initially displays the
Surface Interval screen. Press D again to
advance to the Temperature screen.
• After about six seconds, the watch returns
to the Timekeeping screen from the
Temperature screen. You can return to the
Timekeeping screen manually by pressing
D.
xxx.x°C (or °F) if a measured
About Temperature Measurements
• Whenever you display the Temperature screen or enter the Diving Mode,
the watch performs a temperature measurement and displays the result on
the screen. The watch continues to take temperature measurements every
30 seconds in the Diving Mode.
• Air temperature measurements are affected by your body temperature
while you are wearing the watch, direct sunlight, and moisture. To achieve
a more accurate temperature measurement, remove the watch from your
wrist, place it in a well-ventilated location out of direct sunlight, and wipe all
moisture from the case. It takes approximately 20 to 30 minutes for the
case of the watch to reach the actual surrounding temperature.
• Wearing the watch on your wrist has almost no effect on water temperature
measurements. In the case of sudden extreme changes in water
temperature, however, it takes about five minutes for the temperature of
the watch to match the water temperature.
DIVING FUNCTIONS
The pressure and temperature sensors of this watch provide a wealth of
useful diving data. Besides automatically measuring depths in the Diving
Mode, the watch also stores depth and temperature data into a Log Memory
for later recall.
• You can change the unit of measurement for displayed depth values
between meters (
measurement”.
Important!
• The trigger depth for automatically starting and stopping depth and dive
time measurements in the Dive Mode is 1 meter (4 feet). Because of this,
the explanations in this manual use the term “submerged” to mean at a
depth deeper than 1 meter and the term “surface” to mean at a depth
shallower than 1 meter.
• Note that this watch also discriminates between “valid dives” and “invalid
dives” as described below.
Dive Type
Valid Dive
Invalid Dive
l) and feet (F). See “To change the unit of depth
Definition
• Submerged for at least two
or three consecutive minutes
• Submerged for less than two
or three consecutive minutes
• Insufficient depth
Description
• Starts measurement of the
surface interval when finished.
• Records log data for the dive.
• No surface interval measure-
ment when finished.
• No log data recorded
2172-3
Valid Dive
Surface
Depth =
1.0m/4ft.
Invalid Dive
Surface
Depth =
1.0m/4ft.
1 minute
30 seconds
1 minute
30 seconds
1 minute
5 seconds
1 minute
25 seconds
2 minutes
50 seconds
Valid Dive
1 minute
20 seconds
1 minute
50 seconds
1 minute
30 seconds
On the Surface
Submerged
On the Surface
Submerged
Understanding the Diving Mode Screen
Surface Screen
Compartment Nitrogen
Loading Graph
Current depth
• The Surface screen appears while you are on the surface, while the
Submerged screen appears while you are submerged.
• The dive time value shows the elapsed time you spend submerged.
• Pressing C while the Surface screen or Submerged screen is on the
display changes to the Maximum Depth screen for about three seconds.
• The dive start time shows when your dive first reached submerged depth
after you entered the Diving Mode.
• The maximum depth value shows the maximum depth you reached during
your dive, as measured by the watch.
• See “COMPARTMENT NITROGEN LOADING GRAPH”.
Current time
Dive time
000
10 58
00
2
4
Current temperature
Submerged Screen Maximum
Dive time
30 52
1128
82
2
4
Depth Screen
Current temperature
Dive start time
10 58
243
80
2
Maximum depth
Using the Diving Mode
Make sure you are out of the water whenever performing button operations
before or after diving.
To enter the Diving Mode before diving
000
10 58
00
2
4
To exit the Diving Mode after diving
After finishing your diving, hold down C for about two seconds to exit the
Diving Mode and enter the Timekeeping Mode.
• Note that you cannot exit the Diving Mode while you are submerged.
Note
• If you switch to the Timekeeping Mode after surfacing, be sure to switch
back to the Diving Mode before starting your next dive. If you stay in the
Diving Mode after surfacing, your next dive will be considered a
continuation of the previous dive, with data being added on accordingly.
• Exiting the Diving Mode after a valid dive causes information about the
dive to be recorded in the watch’s Log Memory.
• If you leave the watch with the Diving Mode Surface Screen on the display
without performing a button operation for about one hour after surfacing, it
automatically exits the Diving Mode and enters the Timekeeping Mode.
Always check to make sure the watch is actually in the Diving Mode before
actually starting a dive.
• Dive times can be measured up to 11 hours 59 minutes and 59 seconds.
When the dive time reaches 12 hours, the watch automatically stores log
data up to that point and exits the Diving Mode and enters the Timekeeping
Mode. The watch also starts measuring the surface interval at this time.
In any other mode, hold down C for about two
seconds to enter the Diving Mode.
• While the watch is in the Diving Mode, it will
automatically start measurements whenever
you are submerged and stop measurements
whenever you are on the surface.
Surface Interval
Surface interval
(hours : minutes)
630
030
15
1
5
0
Whenever you surface after a valid dive, the
watch’s surface timer starts to count the
amount of time you spend on the surface. The
surface interval is counted up to 48 hours or
until you begin your next dive.
To display the Surface Interval screen
In the Timekeeping Mode (after exiting the
Diving Mode following a valid dive), press D
to display the Surface Interval screen.
• To return to the Timekeeping screen, press
D twice.
Using the Watch while Skin Diving
You can use this watch while skin diving without affecting dive data or surface
interval timing. Log data is not stored in memory and surface interval timing
continues as long as you do not start a valid dive.
Log Memory
After finishing a dive, log data for the dive is stored into the watch’s Log
Memory when you exit the Diving Mode and enter the Timekeeping Mode.
The watch has enough memory to store up to 20 log data records. The
following are the items stored for each log data record.
Surface interval
Dive time
50
2
Description
100
147
2
4
28
1
Average depth
Unused Record
Screen
24
17
Number
of unused
records
Item
Dive Date
Dive Number
Dive Start Time
Dive End Time
Dive Time
Maximum Depth
Average Depth
Maximum Depth
Temperature
Surface Interval
Compartment Nitrogen
Loading Graph
• When the Surface Interval time reaches 48 hours, the displayed time
changes automatically of
• Up to 20 log data records can be stored in memory. Once memory is full,
memory is updated by storing the newest record and deleting the oldest
record.
• In addition to the log data listed above, the watch also stores depth data in
memory. See “DIVE PROFILE” for more information.
Month and day of the dive
Dive number for the day
Hour and minutes, seconds rounded down
Hour and minutes, seconds rounded up
Hours and minutes, seconds rounded up
Maximum measured depth reached
Total of depth measurements divided by the number of
depth readings
Water temperature at the maximum depth of the dive
Time elapsed from the end of the last valid dive to the
start of the next valid dive, seconds rounded down
Compartment Nitrogen Loading Graph at the end of the
dive
xx:xx.
To recall log data
1. Use C to enter the Recall Mode.
• The initial screen that appears is the data screen for the last (newest)
record stored in memory.
2. Use D (new ➞ old) and B (old ➞ new) to scroll through the log data.
• Each press of A toggles between the date screen and maximum depth
screen.
• Pressing B and D at the same time displays the date screen for the last
recorded log data.
Date Screen Maximum Depth Screen
Dive end time
Dive start time
500
1058
1158
82
x
3
Dive date
Compartment Nitrogen
Loading Graph
Note
• The watch comes with sample data for a single dive in its Log Memory for
demonstration purposes.
• The Maximum Depth screen alternates every five seconds between display
of the maximum depth and average depth.
• The Unused Record screen shows the number of records in memory that
do not contain any data. It is located after the oldest record currently stored
in memory.
Dive number
Maximum
depth
Maximum depth
temperature
2172-4
To delete log data
Holding down A for about two seconds in the Recall Mode or Dive Profile
Mode deletes all the log data and dive profile data for the currently displayed
record.
• Deleting log data while a surface interval timing operation is in progress
stops the surface interval timing operation.
Using Log Data with Dive Tables
■ Make sure you have a clear understanding of dive tables and their use.
Before using this watch, make sure you have undergone a thorough diving
training program.
■ Make sure you have a clear understanding of the special characteristics of
all the log data provided by this watch (dive time, maximum depth, dive
start time, dive end time, average depth, maximum depth temperature).
■ Always remember that depth readings provided by this watch are not
guaranteed for 100% accuracy.
■ Any log data accompanied by a warning indicator should not be used. For
details, see “Warning Indicators”.
■ Always obey the basic rules of safe diving.
• It is recommended to dive within the limits of the non-decompression
limit. Be sure to take “safety stops” every 3 to 6 meters (10 to 20 feet).
• It is dangerous to dive near the non-decompression limit. Dive 1 to 2
ranks inside of your own personal limitations.
• No dive table is 100% accurate. You should always take into account
individual physical differences, your physical condition, water
temperature, etc.
• Note that high altitude and fresh water diving requires the use of special
dive tables and calculations. Be sure to receive appropriate training
before attempting high altitude or fresh water diving.
Calculation of Average Air Consumption Using Average Depth
Average depth is calculated by adding all depth readings greater than 1
meter (4 feet) and dividing the total by the number of readings taken. Since
readings at depths less than 1 meter (4 feet) are ignored, you will not be able
to use average depth log data to calculate average air consumption if tank air
is consumed while on the surface.
You should also note here that time you spend on the surface is not included
as part of the dive time.
Date Screen Maximum Depth Screen Dive Profile
Dive end time
Dive start time
500
10 58
11 58
82
Dive date
Note
• When there are profiles for fewer than 20 dives in Dive Profile memory, the
Remaining Record screen, which shows the current number of unused
records, appears after the oldest record.
• Pressing B and D at the same time while the Date screen is on the
display jumps to the Date screen for the newest log data. The Date screen
remains on the display for about three seconds. After that, the display
switches to the Maximum Depth screen for that log data.
• Pressing B and D at the same time while the Dive Provide Data screen
is on the display returns to the Maximum Depth screen.
3 seconds
x
➞
3
Dive
Profile Graph
Dive time
500
100
50
2
Maximum depth
of selected dive
Data Screen
Elapsed time
100
Dive
Profile Graph
25
Maximum depth during
minute indicated by
elapsed time
001
Interpreting the Dive Profile Graph
The Dive Profile Graph assigns a value of 10 to the maximum depth value of
the currently selected log data, and then plots all other depths relative to the
maximum. The appearance of the Dive Profile Graph depends on whether
you are viewing it on the Maximum Depth screen or the Dive Profile Data
screen.
• On the Date screen and Maximum Depth screen, the Dive Profile Graph
shows data from the beginning of the dive up to the 50th minute of the
dive, in five-minute intervals. The maximum depth reached during each
five-minute interval is used for graphing.
• On the Dive Profile Data screen, the Dive Profile Graph shows data from
the beginning of the dive up to the 100th minute of the dive, in one-minute
intervals. The bar in the graph that represents the currently displayed
elapsed time minute flashes.
DIVE PROFILE
When you exit the Diving Mode after a valid dive, the watch stores the
following Dive Profile data in memory, in addition to the log data.
As its name suggests, Dive Profile data provides a record of the maximum
depth reached during each minute of a valid dive.
Item
Elapsed Time
Depth Readings
• The depth readings of the Dive Profile are used to generate a Dive Profile
Graph.
• Dive Profile data memory allows up to 100 minutes duration for a single
dive, and can store data for up to 20 dives.
• No more profile data is stored in memory after the RECOVER or BATT
indicator (which indicates that battery power is weak) appears on the
display during a dive.
• This time indicates the minute from the start of the dive
for whose depth reading is on the display.
• Elapsed time is recorded as hours and minutes.
• Maximum depth reached during the minute indicated by
the elapsed time reading.
To recall Dive Profile data
1. Use C to enter the Dive Profile Mode.
• At this time, the Date screen for the log data that was displayed the last
time you exited the Recall Mode appears on the display for about three
seconds. After that, the display switches to the Maximum Depth screen for
that log data.
• Pressing A while the Maximum Depth screen is on the display changes to
the Date screen for about three seconds.
2. Use D (new ➞ old) and B (old ➞ new) to display the Date screen of the
Dive Profile data you want to view.
3. While the Maximum Depth screen is on the display, use D (+) and B (–)
to change to the Dive Profile Data screen and scroll through the Dive
Profile data (depth readings) minute-by-minute.
Description
Dive Profile screenDate/Maximum depth screen
500 100
Maximum depth
boundary line
• Dive Profile data past the 50th minute of the dive is not shown on the Dive
Profile Graph of the Date screen and Maximum Depth screen.
• If the maximum depth of a dive exceeds 80 meters (263 feet), graph data
will go past the maximum depth boundary line.
• Dive Profile data (including the Dive Profile graph) is deleted whenever you
use the procedure under “To delete log data” to delete the corresponding
log data.
Maximum depth
boundary line
COMPARTMENT NITROGEN LOADING GRAPH
Important!
• Be sure to read this section carefully before using the Compartment
Nitrogen Loading Graph.
During a dive, the diver breathes air (or some mixture of gasses) that is
pressurized in accordance with the dive depth. Breathing air or other gas
while the body is under pressure causes gas to be dissolved into the body’s
blood and tissues. The deeper the dive (and the greater the pressure) and
the longer the dive, the greater the uptake of gas into the body’s tissue. In
dives that use air or nitrox (a mixture of nitrogen and oxygen), tissue nitrogen
uptake can cause a painful condition called “decompression sickness
syndrome” (DCS). To protect against DCS the prudent diver must formulate
and follow a diving plan that takes tissue nitrogen uptake and elimination into
consideration. This watch displays a graph of reference data that shows the
tissue nitrogen uptake based on compression theory.
Halftime Model
The term “halftime” refers to half the time it takes for gas (such as nitrogen)
dissolved tissue to equilibrate to a new pressure, or to reach full saturation at
a new pressure. Theoretical tissue half times are used in designing dive
tables and algorithms for dive computers.
Nitrogen dissolves into tissue very quickly at first, with the rate gradually
slowing as the uptake amount increases, until is become extremely slow at
the point of full saturation. The actual full saturation point depends on the
ambient water pressure. Full saturation half time is half the time it takes to
reach full saturation.
Figure 1 shows the saturation of tissue with nitrogen in graphic form. Figure 2
shows the inverse as nitrogen is eliminated a low pressure.
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