Mode Change Flow
Using the Dive Plan Mode

This mode is used to set the plan for the next dive. The dive plan mode uses the three displays described below.
Dive Condition Display: This lets you change between AIR diving and NITROX diving and set the oxygen concentration (O2%). Continuously displays the current settings.
Dive Plan Display: This lets you display the number of the next dive for repetitive diving, a graph of the body nitrogen level, and the no-decompression limit time corresponding to initial and repetitive diving..
Dive Alarm Display: This lets you display and set the depth alarm and dive time alarm.

1.Switching the Display
The display changes each time the lower right button (A) is pressed once in the dive plan mode. The displayed contents differ between when the watch is set to AIR and when it is set to NITROX diving.
  <AIR Diving>
  <NITROX Diving>
* If none of the buttons are pressed for about 3 minutes during each of the displays of the dive plan mode, the watch automatically returns to the time mode of the standard mode.
* The dive condition mark of the dive plan display changes to the high altitude mark in environments at an air pressure equivalent to high-altitude diving.

2.NITROX Setting
The NITROX setting is for use when diving with a mixed gas having an oxygen concentration that differs from that of air tanks used for ordinary diving (oxygen concentration: 21%). Set the watch to AIR for all other types of diving. The watch will return to the AIR dive mode automatically after 6 hours have elpased without diving, or, 30 minutes have elpased during surface interval time after NITROX diving.
Always double check the oxygen concentration (O2%) before each and every NITROX dive.
It is very important to ensure that the percentage of oxygen carried in your tank, maches the setting of the watch exactly. Failure to comply with this instruction may result in decompression sickness, oxgen toxication or death . The oxygen concentration (O2%) setting connot be changed whilst diving, therfore always check that the correct O2% is set before diving.

3.High-Altitude Setting
Since air pressure decreases at high altitudes, it is necessary to take this change in air pressure into consideration when calculating the body partial pressure of oxygen. This watch periodically measures air pressure and then calculates the body partial pressure of oxygen each time based on the measured air pressure, thereby eliminating the need to manually set the watch for high altitudes. In environments where air pressure is low, the watch automatically judges the environment to be a high-altitude environment, and the Dive condition mark changes to the high altitude mark ( or  ). The altitude at which the Dive condition mark changes to the high altitude mark is about 300 m (1,000 ft) above sea level.
  The high altitude mark is only intended to serve as a general indicator of high altitude. There may be times when the Dive condition mark does not change to the high altitude mark even at altitudes above 300 m (1,000 ft) above sea level, or times when the Dive condition mark changes to the high altitude mark even though the watch is at a low altitude below 300 m (1,000 ft) above sea level. In any case, the watch can be still used without risk since the dive computer calculates the body partial pressure of oxygen corresponding to the air pressure at that time.

4. Dive condition marks
The dive type currently set for each of the time modes of the standard mode, the dive plan display in the dive plan mode and the surface mode is displayed using one of the four types of marks indicated below.
Identification of the AIR or NITROX setting for the next dive set in the dive plan mode
Identification of high-altitude diving automatically set according to the air pressure measured by the pressure sensor
AIR setting AIR setting and high-altitude diving
NITROX setting NITROX setting and high-altitude diving
* The dive condition mark ( or   ) flashes for about 1 hour to warn the diver in the case the watch has automatically returned to the AIR setting from the NITROX setting.

5. Switching Dive Condition and Setting Oxygen Concentration (O2%)
A. NITROX Setting and Oxygen Concentration Setting
(1) The watch switches to the NITROX "Oxygen Concentration Setting State" (display flashes) when the upper left button (C) is pressed for 2 seconds or more and then released during the dive condition display ("AIR" display).
(2) Set the oxygen concentration (O2%) by pressing the lower right button (A) or upper right button (B).
* Oxygen concentration increased by 1% each time the upper right button (B) is pressed once, and decreases by 1% each time the lower right button (A) is pressed once. (Oxygen concentration can be corrected rapidly by continuously depressing either button.)
(3) The oxygen concentration setting is finalized by pressing the upper left button (C) or lower left button (D) and then releasing.
* Oxygen concentration (O2%) can be set between 22% and 50%.
* If none of the buttons are pressed for about 3 minutes in the oxygen concentration setting state (display flashing), the flashing oxygen concentration setting is finalized automatically and the watch changes to the NITROX setting display.
* In the case of changing the oxygen concentration setting after it has been set, reset the oxygen concentration after first returning to the "AIR" setting display.
B. Switching from NITROX Setting to AIR Setting
After about 30 minutes have elapsed for surface interval time after having performed scuba diving in the "NITROX" setting, an alarm sounds and the watch automatically returns to the "AIR" setting. In addition, if scuba diving is not performed for about 6 hours after having set the watch to NITROX, the watch automatically returns to the "AIR" setting. In the case of returning to the "AIR" setting after having set the watch to "NITROX", return the watch to the "AIR" setting by pressing the upper left button (C) for 2 seconds or more and then releasing during the "NITROX" display.

6.Calling Up No-Decompression Limit
1. The no-decompression limit time corresponding to a depth of 12 m (40 ft) is displayed when the upper right button (B) is pressed once during the dive plan display.
2. No-decompression limit times are called up in order for every 3 m (10 ft) of depth each time the upper right button (B) is pressed once. Repeatedly press the upper right button (B) until the depth corresponding to the depth of the next scheduled dive is displayed.
* No-decompression limit time changes according to the diving depth of the previous dive, dive time and surface interval time.

<Displayed Depth>
This watch displays no-decompression limit time for the following 12 depths.
 12m,  15m,  18m,  21m,  24m,  27m,  30m,    33m,    36m,   39m,   42m,   45m
(40 ft, 50 ft, 60 ft, 70 ft, 80 ft, 90 ft, 100 ft, 110 ft, 120 ft, 130 ft, 140 ft, 150 ft)
Please dive while allowing ample margin with respect to the displayed nodecompressionlimit time to ensure safety.

7. Dive Alarm
<Depth Alarm>
The depth display flashes and an alarm sounds for 15 seconds at 1 minute intervals (for the set number of times) to warn the diver when the diver remains at a depth deeper than the set depth while diving. The alarm stops sounding when the diver ascends to a depth less than the set depth, and sounds again if the diver descends deeper than the set depth.
Setting range: 10 m (33 ft) to 39 m (130 ft) (1 m (4 ft) units), OFF
No. of times alarm sounds: 1 to 5 times, ON (no limit)

<Dive Time Alarm>
The dive time display flashes and an alarm sounds for 15 seconds when the set time elapses from the start of the dive. This alarm sounds only once.
Setting range: 5 min to 90 min (5 min intervals), OFF

A. Setting the Dive Alarm
1. The watch enters the correction state (display is flashing) when the upper left button (C) is pressed for at least 2 seconds and then released during the dive alarm display. The flashing item on the display can be corrected.
2. The flashing item changes in the order shown below each time the upper left button (C) is pressed once.
*The display returns to the normal display when the upper left button (C) is pressed and then released in the dive time correction state.



3. Correct the flashing item by pressing either the upper right button (B) or lower right button (A).
* Pressing the upper right button (B) advances the display by one step at a time each time it is
pressed, while pressing the lower right button (A) moves the display back by one step at a time each time it is pressed. (Pressing either button continuously causes the display to change rapidly.)
* Correction of the number of times the alarm sounds is skipped when the depth alarm is set to OFF.
4. Press and release the lower left button (D) finalize the settings.
* Set each parameter to OFF when you do not want the depth alarm and dive time alarm to sound.
* The watch automatically returns to the normal dive alarm display when none of the buttons are pressed for about 3 minutes in the correction state (display flashing).
* The watch can be immediately returned to the normal dive alarm display by pressing the lower left button (D) and then releasing in the correction state (display flashing).
B. Dive Alarm Monitor
Each alarm sound repeatedly sounds for 4 seconds each in the order of the depth alarm, dive time alarm and ascent rate alarm for as long as the upper right button (B) is pressed during the dive alarm display.
* Refer to the section on "Warning Functions" for information on the ascent rate warning alarm.

To Page-Top

Copyright 2003 CITIZEN WATCH CO.,LTD. ALL Rights Reserved.