Warning Functions
This watch is equipped with various warning functions for the purpose of avoiding risks and problems when diving as much as possible.
 Do not dive in a manner that activates any of the warning functions. Since the degree of risk varies according to experience, physical condition and diving conditions, do not assume that diving is completely safe just because none of the warning functions are activated. Please use the warning functions as a general indicator of diving safety.
 If a warning alarm sounds during diving, first begin to ascend to a shallow depth at an ascent rate of no more than 18 m (60 ft)/min to ensure safety. Since the risk involved increases as you dive to greater depths, multiple alarms may continue simultaneously, causing multiple warning alarms to sound.

1.Types of Warning Functions and Conditions for Activation of Warning     Functions.
The warning functions provided by this watch along with the conditions under which each warning function is activated are as shown below.
Types of warnings Condition for activation of warning function
When using on land During AIR diving During NITROX diving
Insufficient charge warning
File error warning
Abnormal pressure detection error warning    
Water sensor check warning    
Ascent rate warning  
Abnormal depth warning  
Exceed maximum depth warning  
Decompression diving warning    
Decompression diving error    
Permanent error warning  
Permanent error  
PO2 limit warning    
PO2 limit error    
Oxygen toxication time warning    
Oxygen toxication time error    

2. Explanation of Warning Functions
Insufficient Charge Warning



When the watch becomes insufficiently charged, "BATT" flashes in the lower left corner of the display in all of the modes of the standard mode. Operation of the following functions is limited while this warning function is activated.
* The watch does not switch to the dive mode even if the watersensor gets wet. (The watch automatically switches to the chargelevel indicator display of the system monitor mode when the water sensor gets wet.)
* None of the alarms sound.
* Data cannot be transferred by infrared communication. (However, data can be transmitted to a personal computer by USB communication.) .
* The EL light is not illuminated.
When this warning function is activated, charge the watch by attaching to the charger as soon as possible. The display will return to normal once the watch is sufficiently charged.
* None of the dive alarms sound when the insufficient charge warning function is activated during diving. Although the dive computer will function normally for about 30 minutes after "BATT" starts to flash, the log data for that dive is not recorded after "BATT" has started flashing. Promptly begin to ascend it this warning function is activated during diving.
* If the watch remains insufficiently charged after the insufficient charge warning function has been activated, it switches to the low power mode after about 2 days. Please note that if the watch continues to be left uncharged in the low power mode, all functions stop and all watch settings return to the initial (default) settings.

File Error Warning to Top



When the amount of available memory in flash memory becomes low, "FILE" flashes in the lower left corner of the display in all of the modes of the standard mode as well as in the dive mode.
* The watch automatically switches to the flash memory status display of the system monitor mode when the water sensor gets wet while this warning function is activated. Please note that although it is possible to use the watch for diving in this state, log data may not be recorded in flash memory during diving.
* The file error warning function is also activated and additional log data is not recorded if the duration of a single dive exceeds 2 hours or if more than 15 dives are made in a single day.
* The file error warning function may also be activated when the water temperature during diving is low.
* It may not be possible to receive watch settings by data communication while the file error warning function is activated.
* When the watch has switched to the file error warning display, perform the garbage collection procedure in the system monitor mode of the standard mode. The display returns to normal following completion of garbage collection.

Abnormal Pressure Detection Error Warning to Top



When abnormal atmosphere pressure is detected during use on land, or when ascending to high locations more than 3,000 m (10,000 ft) above sea level, "ERR" (Error) flashes in the lower left corner of the display.
* The watch does not switch to the dive mode even if the water sensor gets wet while this warning function is activated.
If "ERR" does not disappear from the display even after a long period of time, there may be a problem with the pressure sensor. When this happens, discontinue using the watch and contact Citizen Service Center.

Water Sensor Check Warning to Top



If the preliminary dive display continues to be displayed for more than 1 hour after the water sensor has gotten wet and the watch has switched to the preliminary dive display in the dive mode, "CHK" (Check) flashes in the lower left corner of the display to inform the wearer that the water sensor should be checked.
* "CHK" also flashes when the watch returns to the normal display from any of the correction states, when the watch is returned to the time mode of the standard mode from the infrared communication mode, and when the water sensor is operating during the all reset procedure.
* The watch does not switch to the dive mode (water depth measurement display) when "CHK" is flashing.
To check the sensor, remove any debris or moisture from the water sensor with a dry cloth. The display returns to normal when the water sensor is canceled.

Ascent Rate Warning to Top



When the ascent rate during scuba diving exceeds 18 m (60 ft)/min, the ascent rate warning alarm sounds for 5 seconds and "SLOW" and an llustration of a turtle are displayed at the bottom of the display.
* The ascent rate warning alarm does not sound during skin diving (continuous diving for less than 3 minutes at a depth of 1 m (4 ft) or more).
The ascent rate warning alarm stops sounding when a proper ascent rate is resumed.

Abnormal Depth Warning to Top



When a sudden change in depth of more than 4 m (13 ft)/sec is detected during diving, the watch assumes that the watch has reached an abnormal depth. At this time, "ERR" and the diver mark are alternately displayed in the lower left corner of the display.
Once "ERR" has been displayed during diving, it continues to be displayed until the dive mode is terminated.
Avoid using this watch in environments subject to sudden changes in water pressure such as when using ocean floor excavation or similar equipment. The vibrations from such equipment may cause a change in water pressure of "4 m (13 ft) or more per second" to be locally and momentarily applied to the pressure sensor of the watch, causing "ERR" to be displayed and preventing water depth from being displayed correctly.
Exceed Maximum Depth Warning to Top



When the limit depth of 40 m (131 ft) for recreational diving is surpassed during the course of diving, an exceed maximum depth error occurs, the current depth flashes and the alarm sounds for 15 seconds. During diving at a depth greater than 40 m (131 ft), the warning alarm sounds for 15 seconds every minute.
This warning function is canceled when the depth returns to 40 m (131 ft) or less.
Decompression Diving Warning to Top



This alarm sounds for 3 seconds and the decompression stop indicator (STOP) is displayed on the display when the no-decompression limit time has been exceeded resulting in decompression diving during the course of diving.
The display returns to the no-decompression diving display when decompression stop is performed in accordance the decompression stop instructions.
Decompression Diving Error to Top



When decompression diving takes place beyond the no-decompression limit time during diving in the NITROX setting, together with the alarm sounding for 1 second and the decompression stop indicator (STOP) being displayed on the display, the instructed depth and instructed time flash. During a decompression diving error, the instructed depth and instructed time continue to flash, and the alarm sounds for 15 seconds every minute.
Ascend to a shallow depth at a safe ascent rate as soon as possible.The display returns to the no-decompression diving display when a decompression stop is performed in accordance with the decompression stop instructions.
Permanent Error Warning to Top



The instructed depth flashes and an alarm sounds continuously when either of conditions 1 or 2 below are met. If hazardous diving or ascending is continued while ignoring this warning, a permanent error (ERROR) occurs:
1. When not ascending to the instructed depth and continuing to dive at an excessively low depth (diving at which the instructed decompression stop depth exceeds 9 m (30 ft).) even though having been instructed to make a decompression stop (Permanent Error Warning 1).
The warning stops when the diver begins to ascend immediately and the decompression stop instructed depth reaches 9 m (30 ft) or less.

2. When having ascended to a depth 1 m (4 ft) or more less than the instructed depth after having been instructed to make a decompression stop (Permanent Error Warning 2).
In this case, the warning is canceled when the diver returns to the instructed depth.

Permanent Error to Top



If hazardous diving or ascending is continued even after the permanent error warning function has been activated, a permanent error results, "ERROR" appears on the display and the entire display flashes.
When a permanent error has occurred, the next dive cannot be made for 24 hours. (The water depth measurement function does not operate for 24 hours. In addition, "ERROR" is displayed when the watch is switched to the dive plan mode, and the no-decompression limit time is not displayed.)
PO2 Limit Warning to Top



PO2 flashes to warn that the PO2 limit is approaching at the depth where PO2 (body partial pressure of oxygen) reaches 1.4 during diving in the NITROX setting.
The alarm stops when you ascend to a shallow depth and PO2 falls below 1.4.
PO2 Limit Error to Top



An alarm sounds for 15 seconds every minute in addition to PO2 flashing display when PO2 exceeds the limit of 1.6 as a result of not ascending to a shallow depth even after the PO2 limit warning has been activated.
The error is canceled and the display returns to the PO2 limit warning display when you ascend to a shallow depth and PO2 falls below 1.6.
Oxygen Toxication Time Warning to Top



When the amount of time remaining until the oxygen toxication time (OTT) decreases to less than 10 minutes during diving in the NITROX setting, the display in the upper right corner of the display changes from no-decompression limit time (NDL) to remaining OTT time (flashing). In the case of decompression diving, remaining OTT time flashes instead of the total ascent time in the upper right corner of the display.
The warning stops if you ascend to a shallow depth and the remaining OTT time returns to 10 minutes or more.
Oxygen Toxication Time Error to Top



If the remaining OTT time reaches 0 minutes as a result of not ascending to a shallow depth even after the oxygen toxication time warning has been activated, an oxygen toxication error occurs, and in addition to "0f " flashing for the remaining OTT time, the alarm sounds for 15 seconds every minute.
The error is canceled and the display returns to the oxygen toxication time warning state when you ascend to a shallow depth and the remaining OTT time increases.


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