Citizen C900 Instruction Manual
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Citizen C900 Instruction Manual

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  • Page 2 • Before using the watch, read this instruction manual WARNING carefully for safe and correct use. CAUTION • After reading this manual, keep it handy for future reference. Diving is inherently dangerous. When wearing this watch while diving, please make sure that you have a correct understanding of the handling of it as Safety Precautions (Instructions to be followed at all times) described in these instructions and observe the correct operating procedure at...

  • Page 3: Table Of Contents

    CONTENTS • Diving while wearing this watch is limited to recreational diving only (non- decompression diving). Do not wear this watch during decompression diving, saturation diving or when diving at high altitudes. Although the watch can be WARNING ....................3 worn in the water over a temperature range of +10°C to +40°C, water depth 1.
  • Page 4 10. Using the Log Memo Mode ..............38 17. Altimeter Applications ................ 68 A. Recalling Log Data B. Deleting Log Data A. Measuring Altitude when Mountain Climbing B. Other Applications C. Explanation of Log Data Terms C. Prominent Mountains and Lowlands Around the World (Reference) 11.
  • Page 5 • Measures water depth in 0.1 m units down to a maximum depth of 80 m. to be performed by a Citizen Service Center since special techniques • Automatically records diving data (log data) of the four most recent dives.

  • Page 6: Warning

    2. Use of this Watch A. Use During Diving CAUTION CAUTION: Please observe the following for safe diving. • When using this watch, please make sure that you have a thorough under- • When using this watch during diving, always make sure to receive the neces- standing of its handling and precautions relating to its use to ensure that it is sary education and training and observe diving rules.

  • Page 7: Digital Display

    * If the second hand is moving at two-second intervals, this indicates that the for shipwrecks or other maritime accidents. • When the watch is used in atmospheres containing helium gas (such as dur- battery is nearly worn down. Please have the battery replaced at a Citizen ing saturated diving) Service Center.
  • Page 8 • Do not attempt to remove any debris or dirt trapped in the sensor by remov- ing the sensor cover or poking with a sharp object. If debris should happen to enter the sensor, rinse with fresh water. When debris cannot be removed by rinsing, consult a Citizen Service Center.

  • Page 9: Use Of Altimeter And Barometer

    • Both the altitude and barometric pressure measurement functions of this becomes trapped in the sensor, rinse the sensor with fresh water. If the watch are subject to the effects of temperature changes. Even in the case of debris cannot be removed by rinsing, please consult a Citizen Service Center.

  • Page 10: Digital Display

    3. Digital Display • Dive Alarm [D.AL] This mode is used to display and set the depth alarm and dive time alarm. The digital display of this watch uses three major modes consisting of the • Altitude Memo [A.log ] “Standard Mode”, “Water Depth Measurement Mode”...

  • Page 11: Names And Functions Of Components

    4. Names and Functions of Components Please read this section while referring to the watch illustration shown in the inside cover. [Standard Mode] Name / Mode Time / Calendar Alarm Chronograph Log Memo Dive Alarm Altitude Memo Surface Switches between Starts and stops the Switches between seconds - - -...
  • Page 12 [Water Depth Measurement Mode/Altitude Measurement Mode] 7 : Analog time: Continuously displays the current time (hours, minutes, Water depth measurement mode Altitude measurement mode seconds) with the respective hands. Name / Mode (during measurement) (during measurement) 8 : Pressure sensor 1: Detects water pressure to measure and display water Recalls maximum water depth/ Press once Starts/stops elapsed time...

  • Page 13: Setting Analog Time

    5. Setting Analog Time <Screw-Locking Crown> • Unscrew the crown to loosen it before turning. • Always make sure that the crown is screwed in and locked in position after turning. • Do not press any of the buttons with the crown pulled out. •...

  • Page 14: Changing The Mode

    6. Changing the Mode • When the water sensor of this watch becomes wet in any of the modes of the standard mode (except during chronograph measurement), the mode auto- • The mode changes in the following order each time button (M) is pressed: matically changes to the water depth measurement mode.

  • Page 15: Using The Time / Calendar Mode

    7. Using the Time / Calendar Mode * The surface mode only displays 24 hours of elapsed time after completion of a continuous dive of at least 3 minutes duration. In other cases, press- ing button (M) when the watch is in the altitude memo mode switches the This mode is used to display the current time and date.

  • Page 16: Setting The Digital Time And Date

    * Pressing button (A) again during display of temperature and barometric pres- * The year can be set from 1998 to 2099. sure returns the watch to the time/calendar display. * Make sure that AM [A] and PM [P] are set correctly when using the 12- * Although the measured value of barometric pressure does not change during hour timekeeping system.

  • Page 17: Display Of Changes In Barometric Pressure

    8. Using the Alarm Mode C. Display of Changes in Barometric Pressure Arrow indicating This watch is equipped with a function that automatically measures change in Once the alarm is set (switched on), it sounds for 15 seconds at the same time barometric pressure barometric pressure on the hour.

  • Page 18: Setting The Alarm Time

    9. Using the Chronograph Mode A. Setting the Alarm Time (1) Press button (M) to switch to the alarm mode. The chronograph function provided with this watch is able to measure elapsed (2) Press button (B) for at least two seconds. The “hours” flash. time in 1/100 second units up to a maximum of 23 hours, 59 minutes and 59 (3) Press button (A) to set the “hours”.

  • Page 19: Chronograph Measurement

    A. Chronograph Measurement * If none of the buttons are pressed for about 3 minutes during the chrono- graph reset display, the watch automatically returns to the time/calendar <Elapsed Time> mode. (1) Press button (M) to switch to the chronograph mode. * The mode cannot be switched during chronograph measurement (including (2) Press button (A) to start or stop the chronograph.

  • Page 20: Using The Log Memo Mode

    10. Using the Log Memo Mode (3) The display changes in the order shown below each time button (A) is pressed. The log data of one dive is displayed using four separate dis- This watch automatically stores the log data from one dive (number of dive, plays.
  • Page 21 C. Explanation of Log Data Terms * A series of hyphens (————) is displayed when there is no log data stored in memory. * When there are less than four sets of log data in memory, the log data 1. Number of dive: The number shown indicates the number of the dive made stored in memory is repeatedly displayed whenever button (B) is pressed.

  • Page 22: Using The Dive Alarm Mode

    11. Using the Dive Alarm Mode * This watch is also equipped with a rapid ascent warning function that sounds an alarm when the ascent rate while diving exceeds 1.5 meters in The dive alarm mode uses a depth alarm and dive time alarm. When the 10 seconds.
  • Page 23 (3) Press button (A) to set the depth. (Pressing button (A) continuously causes * If none of the buttons are pressed for about 3 minutes when the display is the characters to advance rapidly.) flashing, the watch automatically returns to the normal display. Each time button (A) is pressed, the depth increases by 1 meter.

  • Page 24: Using The Altitude Memo Mode

    12. Using the Altitude Memo Mode (3) The display changes in the order shown below each time button (A) is pressed. The contents of one point memo are displayed using four sepa- In this mode, point memos (point number, memo date, memo time, altitude, rate displays.

  • Page 25: Using The Water Depth Measurement Mode

    13. Using the Water Depth Measurement Mode * Altitude and barometric pressure are alternately displayed. Altitude is displayed in “m”, while barometric pressure is displayed in “hPa”. * When displaying altitude and temperature differences, a comparison is made with When the water sensor gets wet in any of the standard modes (except during the values of the previous point number.
  • Page 26 A. Water Depth Measurement and Display • During the preliminary dive display, the mode displayed prior to switching to the pre- liminary dive display is maintained. • During the water depth measurement display, maximum depth and water temperature Depth Water depth is measured every are displayed while button (A) is pressed.
  • Page 27 B. Measurement of Dive Time C. Measurement of Water Temperature When the water depth exceeds 1.0 meter, the watch begins to measure water Depth When water depth exceeds 1.0 temperature starting after 1 minute . Water temperature is displayed while but- meter, measurement of dive time ton (A) is pressed during water depth measurement.

  • Page 28: Using The Surface Mode

    <Abnormal Depth, Warning Function> 14. Using the Surface Mode When water depth changes rapidly by more than 4 meters in 1 second during water depth measurement, the watch interprets The surface mode automatically measures elapsed time following completion this as being an abnormal depth, and “ER” and diving time are of a dive for a maximum of 23 hours and 59 minutes.

  • Page 29: Altimeter Basic Features

    15. Altimeter Basic Features If the watch is switched to the altitude measurement mode within 24 hours after the watch entered the surface mode, “SF.ck” is ini- This watch is designed to calculate altitude from changes in barometric pres- tially displayed for 10 seconds. The watch then switches to the sure using the relationship between barometric pressure and altitude based on altitude measurement mode.

  • Page 30: Using The Altitude Measurement Mode

    16. Using the Altitude Measurement Mode <Altitude Correction> In order to accurately measure altitude for mountain climbing and so forth, it is The watch switches to the altitude measurement mode (altitude correction dis- necessary to set the displayed altitude to the correct altitude at a location that play) when button (M) is pressed for at least 2 seconds in any of the standard serves as a reference for correct altitude (triangulation point, first order leveling modes (except during chronograph measurement).
  • Page 31 Arrow A. Altitude Correction The altitude measurement mode is composed of the following three displays. The display changes in the order shown on the previous page each time but- ton (M) is pressed. (1) Press button (B) during the altitude correction Altitude Correction Display : display to change the direction of the arrow The altitude displayed on the watch can be corrected to the actual altitude...
  • Page 32 B. Continuous Altitude Measurement and Fixed Duration Always make sure to perform altitude correction at a location where Altitude Measurement altitude does not change. Since altitude is not measured during the altitude correction display, if altitude changes during altitude correction, <Switching Between Altitude Display and Barometric Pressure Display>...
  • Page 33 <Altitude Measurement <Altitude / Barometric <Time Memo Display> <Temperature Measurement> Display> Pressure Memo Display> Temperature is displayed for about 10 seconds when button (B) is pressed for at least 2 seconds during the fixed duration altitude measurement display. The Point no. watch also alternates between display of altitude and barometric pressure dur- ing this time.
  • Page 34 <Elapsed Time Measurement> <Display when Measurement * If none of the buttons are pressed for about 10 seconds after performing Measurement of elapsed time starts automatically is in Progress> the procedure of (1) or (2) above, the watch automatically returns to the when the watch is initially switched to the continu- altitude measurement display.

  • Page 35: Altimeter Applications

    17. Altimeter Applications tinuous altitude measurement display. Altitude measurement and elapsed time measurement start automatically. The following is an introduction to specific applications of the altimeter of this (2) Switching to the continuous altitude measurement display or fixed duration watch. Please read the explanations of the uses of each function for further altitude measurement display during climbing provides a continuous display details regarding the respective operating procedure.
  • Page 36 B. Other Applications C. Prominent Mountains and Lowlands Around the World (Reference) <Monitoring Changes in Altitude> Switch the watch to the continuous altitude measurement display in the altitude measurement mode when riding on a train or cable car as it travels through the mountains.

  • Page 37: Low Battery Warning Function

    18. Low Battery Warning Function 19. Other Functions When the battery of the watch approaches the end of its service life, the A. Button Function Display second hand begins to move at two-second intervals (the second hand This watch is equipped with two displays that indicate the functions of buttons advances by two increments in two seconds).
  • Page 38 B. Rotating Bezel C. Compass (only applicable to models equipped with a compass) The rotating bezel is a rotating ring attached to the watch body. It can be used This compass function can be used to obtain an approximate determination of to measured elapsed time while diving.
  • Page 39 D. No Decompression Limits CAUTION • The table of no decompression limits is provided for one-time diving. The range within which the diver can rise to the surface without rest for • Since the no decompression limits differ depending on the diver's physical decompression is determined by the depth and elapsed time of the dive.
  • Page 40 20. Battery <Replacing the Battery> • The battery of this watch must be replaced at a Citizen Service Center. <Battery Life> Please have the battery replaced at a Citizen Service Center. The battery life of this watch is approximately 2 years after a new battery has •...

  • Page 41: Troubleshooting

    Section 23 “All-Reset”. sor. When this happens, discontinue using the watch and consult your nearest If the problem is still not resolved even after the all-reset procedure has been performed, please consult your nearest Citizen Service Center. Citizen Service Center.

  • Page 42: Care For Long Term Use

    22. Care for Long Term Use <Maintaining Water Resistance> Please have your watch inspected at a Citizen Service Center once every 1-2 years to maintain water resistance. Have the packing, glass, crown or other WARNING: Water Resistance Performance parts replaced as necessary.
  • Page 43 The duration that the luminous paint emits light differs Citizen Service Center for repair. Leaving the watch in such a state will allow depending on the illuminance and distance from the light source when it corrosion to form inside.
  • Page 44 If your watch is not water resistant, take it to a Doing so may result in deterioration of the watch, such as deformation of Citizen Service Center. plastic parts. • Avoid using solvents (thinner, benzine, etc.), as they may mar the finish.

  • Page 45: All-Reset

    23. All-Reset • Do NOT place the watch close to household appliances that generate static electricity. Timekeeping may become inaccurate if the watch is exposed to strong static The all-reset procedure is used to return all functions of the watch, including electricity, such as is emitted from a TV screen.

  • Page 46: Specifications

    * The effects of changes in temperature (per 10°C) are as shown below. Altitude: Max. 120 m / Barometric pressure: Max. 12 hPa 1. Model : C900 * Guaranteed accuracy temperature range: -20°C to +40°C 2. Timekeeping accuracy : Within ±20 seconds per month (when worn at nor- 5.
  • Page 47 • 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 hPa to 1050 hPa (1 hPa units) • Elapsed time measurement: 24 hour timekeeping system (1 minute units) •...

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