Important Points To Remember; Sensor Errors; Warning Indicators - Casio 2172 Manual

Repeat Diving and the Nitrogen Graph
• The boundary shown here is an example intended for reference purposes
only.
Example: At the end of repeat diving
Repeat diving over a long period causes
nitrogen to build up in slow tissue.
Repeat diving causes nitrogen to build up in slow tissue. Even if each dive is
relatively shallow, repeat diving over a number of days can cause safety
problems due to build up of nitrogen in the body.
Slow tissue in particular has a very narrow margin for nitrogen saturation.
Because of this riding in an aircraft after repeat diving can cause a drop in
pressure and create a dangerous situation.
Example: After a 12-hour surface interval
(On land)
Boundary value
Margin
Very narrow margin for
nitrogen saturation
• Low pressure in an aircraft can cause a relative drop in the boundary,
which results in values exceeding the limit.

IMPORTANT POINTS TO REMEMBER

Note the following important points that define the conditions under which the
watch can be used when diving.
• Do not use the watch in temperatures outside the specified operating
° °
temperature range (0 C to 40 C/32
Never use this watch for applications such as "cold water diving" where the
water temperature is extremely low, as resulting readings will be incorrect.
• You cannot exit the Diving Mode while submerged (while 1.0m (4F) or
more is shown as the current depth).
• Avoid using this watch for dives deeper than 80 meters (263 feet).
This watch is designed to measure depths between 0.0 and 80 meters
(263 feet). When a depth of 80 meters (263 feet) is exceeded, the
message dEEP appears on the display. Note also that for recreational
diving, it is recommended to dive no deeper than approximately 30 meters
(99 feet).
• Calculation is impossible whenever the dive time exceeds 12 hours.
The maximum dive time that can be measured by this watch is 12 hours.
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. When recreational diving, you should keep your dives to less than
one hour, no matter what the depth.
• This watch cannot be used in helium atmospheres.
Use of this watch in helium atmospheres may result in malfunction or even
damage to your watch.
• This watch does not replace pressure gauges.
This divers watch is designed only as a backup to your standard diving
(skin diving and scuba diving) equipment.
• This watch is not a diving computer.
This watch is not a diving computer for performing decompression
calculations. The data produced by this watch is intended as general back
up for more formal data obtained from other means.
Example: After 12-hour interval time
Slow tissue eliminates nitrogen slowly,
even during a long surface interval.
(In an aircraft: 0.8 atmospheres)
Boundary value
Margin
0.8 atm
° °
F to 104 F).
MEASUREMENT ERRORS AND WARNING
INDICATORS
Depth Reading Errors
Operational errors or abnormal environmental conditions can cause incorrect
depth readings, such as –1.0 meter (–4 feet), etc.
These readings may occur when the following conditions exist.
• When the watch is exposed to sudden temperature changes (such as
when it is suddenly submerged after being exposed to direct sunlight for an
extended period) or air pressure
• When the depth reading is mistakenly set to
1 00
10 58
x x x
2 4
1 00
10 58
0 0
2 4
Since depth reading errors are not caused by malfunction of the watch, depth
measurements and log memory storage continue to be performed after you
reset the depth to 0 . 0 l ( 0 F ). Note, however, that the " " indicator remains
on the display after you reset the depth. Whenever a depth reading error
occurs, exit the Diving Mode to the Timekeeping Mode and then re-enter the
Diving Mode before diving again.

Sensor Errors

Subjecting the watch to very strong impact can
cause the sensor to malfunction in the Diving
Mode. When this happens, an
1 00
appears on the display along with the "
10 58
indicator, which indicates incorrect data.
x x x
• Appearance of an
dive time measurement. Holding down C
for about two seconds to exit the Diving
Mode and enter the Timekeeping Mode
stops the dive time measurement.
• The "
" indicator and the z$t err
when battery power is too low to power sensor operation.
• If a depth reading error occurs while the temperature where you are using
the watch is outside its specified operating temperature range (0°C to
40°C/32°F to 104°F) causes a sensor error, so only dive time is performed.
• Do not use your watch for diving after a sensor error occurs. Consult
your authorized CASIO dealer or distributor as soon as possible to
arrange for servicing by an authorized CASIO Service Point listed on
the Warranty Card.

Warning Indicators

A warning indicator appears on the display when some abnormality is
detected during Diving Mode measurements. The same warning indicator
also appears when the data is recalled from Log Memory. Note that warning
indicators indicate major data errors, and such data should not be used for
dive planning, etc.
The following table describes the meaning of each warning indicator.
Warning
Meaning
Indicator
Default Zero • Diving Mode entered while submersed.
Depth Pressure • Measured water temperature lower than
(1.033 kg/cm 2 ) –0.1°C/32°F or greater than 40°C/104°F
Depth Error • Extreme sudden temperature or
pressure change
• Incorrect
Sensor Error • Sensor malfunction
Low Battery • Battery power is low (measurement
functions disabled)
Low Battery • Battery power is very low (measurement
functions, storage of dive end time and
dive in memory disabled)
• All applicable indicators appear when more than one error condition occurs
at the same time.
• If the Default Zero Depth Pressure and Depth Error conditions occur at the
same time, the warning indicators show "
appears on the display.
• Frequent appearance of warning indicators can mean that your watch
requires repair. Contact your authorized CASIO Dealer or Distributor to
arrange for repair by an Authorized CASIO Service Point.
2172-7
0 . 0 l ( 0 F ) while submerged
In such cases, a depth measurement
error occurs and the message err
appears on the display for three seconds,
followed by a flashing double warning
indicator ( ). Most of the time, depth
errors occur on the surface, so the
0
reading is automatically reset to .
after the error display.
Note that appearance of the double
warning indicator indicates a major error
in the displayed data, so the data should
be disregarded.
err
message
err
message starts a
message appear in the Diving Mode
Possible Cause
0 0 l
. reset
" and the err message
0 l
"