Citizen C900 Instruction Manual

• Dive Alarm [D.AL]This mode is used to display and set the depth alarm and dive time alarm. • Altitude Memo [A.log ]This mode is used to recall and

214. Names and Functions of ComponentsPlease read this section while referring to the watch illustration shown in theinside cover. 20Name / Mode Time

7 : Analog time: Continuously displays the current time (hours, minutes,seconds) with the respective hands.8 : Pressure sensor 1: Detects water pressu

<Screw-Locking Crown>• Unscrew the crown to loosen it before turning.• Always make sure that the crown is screwed in and locked in position afte

• When the water sensor of this watch becomes wet in any of the modes of thestandard mode (except during chronograph measurement), the mode auto-matic

7. Using the Time / Calendar ModeThis mode is used to display the current time and date.• The watch alternates between displaying “hours, minutes and

* The year can be set from 1998 to 2099. * Make sure that AM [A] and PM [P] are set correctly when using the 12-hour timekeeping system. * If none o

C. Display of Changes in Barometric PressureThis watch is equipped with a function that automatically measuresbarometric pressure on the hour. This f

9. Using the Chronograph ModeThe chronograph function provided with this watch is able to measure elapsedtime in 1/100 second units up to a maximum of

* If none of the buttons are pressed for about 3 minutes during the chrono-graph reset display, the watch automatically returns to the time/calendarmo

• Before using the watch, read this instruction manualcarefully for safe and correct use.CAUTION• After reading this manual, keep it handy for futurer

(3) The display changes in the order shown below each time button (A) ispressed. The log data of one dive is displayed using four separate dis-plays.

C. Explanation of Log Data Terms1. Number of dive: The number shown indicates the number of the dive madeon that day.* The dive count starts over from

* This watch is also equipped with a rapid ascent warning function thatsounds an alarm when the ascent rate while diving exceeds 1.5 meters in10 secon

* If none of the buttons are pressed for about 3 minutes when the display isflashing, the watch automatically returns to the normal display. * Pressi

4746(3) The display changes in the order shown below each time button (A) ispressed. The contents of one point memo are displayed using four sepa-rat

* Altitude and barometric pressure are alternately displayed. Altitude is displayedin “m”, while barometric pressure is displayed in “hPa”. * When d

A. Water Depth Measurement and Display51• During the preliminary dive display, the mode displayed prior to switching to the pre-liminary dive display

C. Measurement of Water TemperatureWhen the water depth exceeds 1.0 meter, the watch begins to measure watertemperature starting after 1 minute . Wat

14. Using the Surface ModeThe surface mode automatically measures elapsed time following completionof a dive for a maximum of 23 hours and 59 minutes.

15. Altimeter Basic FeaturesThis watch is designed to calculate altitude from changes in barometric pres-sure using the relationship between barometri

• Diving while wearing this watch is limited to recreational diving only (non-decompression diving). Do not wear this watch during decompression divi

16. Using the Altitude Measurement ModeThe watch switches to the altitude measurement mode (altitude correction dis-play) when button (M) is pressed f

A. Altitude Correction(1) Press button (B) during the altitude correctiondisplay to change the direction of the arrow(correcting up or down). Correct

B. Continuous Altitude Measurement and Fixed DurationAltitude Measurement<Switching Between Altitude Display and Barometric Pressure Display>The

(2) When button (A) is pressed during point (P1 through P6) and barometricpressure display, the time at that time is stored in memory in the form of a

<Elapsed Time Measurement>Measurement of elapsed time starts automaticallywhen the watch is initially switched to the continu-ous altitude measu

tinuous altitude measurement display. Altitude measurement and elapsedtime measurement start automatically. (2) Switching to the continuous altitude

C.Prominent Mountains and Lowlands Around the World (Reference)71B. Other Applications<Monitoring Changes in Altitude>Switch the watch to the co

19. Other FunctionsA. Button Function DisplayThis watch is equipped with two displays that indicate the functions of buttons(A) and (B) using marks an

C. Compass (only applicable to models equipped with a compass)This compass function can be used to obtain an approximate determination ofdirection bas

CAUTION• The table of no decompression limits is provided for one-time diving.• Since the no decompression limits differ depending on the diver&apos

17. Altimeter Applications ... 68A. Measuring Altitude when Mountain Climbing

<Replacing the Battery>• The battery of this watch must be replaced at a Citizen Service Center.Please have the battery replaced at a Citizen Se

<Watch Cannot be Switched to Another Mode from the Water DepthMeasurement Mode>When there has been a pressure change of 1000 hPa or more with th

8382Minor exposure to water(washing face, rain, etc.)Dial or Case (case back)IndicationSpecificationsWater-resistant to 200MExamples of useOK OKModera

CAUTION: Luminous Dial• The luminous paint used for the dial of this watch is mainly made from aluminescent material, which is harmless to the human

CAUTION: Operating environment • Use the watch within the operating temperature range specified in the instruc-tion manual. Using the watch where temp

23. All-ResetThe all-reset procedure is used to return all functions of the watch, includingthe time and calendar, to their initial states. Perform t

* The effects of changes in temperature (per 10°C) are as shown below.Altitude: Max. 120 m / Barometric pressure: Max. 12 hPa* Guaranteed accuracy tem

• Temperature measurement: -9.9°C to +40.0°C (0.1°C units)• Altitude measurement: -300 to +6300 m (5 m units)• Barometric pressure measurement: 452 hP

1. FeaturesThis watch is a combination watch equipped with a water depth gauge thatmeasures water depth during diving, and an altimeter that measures

A. Use During DivingCAUTION: Please observe the following for safe diving.• When using this watch during diving, always make sure to receive the neces

CAUTION-Diving Precautions<Before Diving>• Check that the display of the watch is in a mode other than the altitude mea-surement mode or chronog

CAUTION-Diving at High Altitudes or in Fresh Water• Do not use this watch when diving at high altitudes more than 4000 m abovesea level since it is un

the same barometric pressure, display values (for altitude and barometricpressure) may change if the temperature changes.PROHIBITED-Prohibited Uses of