Citizen C900, Instruction Manual

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Page 2: ...l Warning caution symbol followed by instructions that should be fol lowed or precautions that should be observed Prohibition symbol followed by do nots What you should not do 2 WARNING 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 described in these instructions and observe the correct operating ...

Page 3: ...se of this watch is limited to recreational diving even recre ational diving can be dangerous The user is strongly recommended to use this watch only as a supplementary instrument during diving after having first received the proper scuba diving training from a qualified instructor acquiring the necessary experience and skills for safe diving and completely mastering the handling and operation of ...

Page 4: ... Recalling Log Data B Deleting Log Data C Explanation of Log Data Terms 11 Using the Dive Alarm Mode 42 A Setting the Depth Alarm and Dive Time Alarm 12 Using the Altitude Memo Mode 46 A Recalling a Point Memo B Deleting a Point Memo 13 Using the Water Depth Measurement Mode 49 A Water Depth Measurement and Display B Measurement of Dive Time C Measurement of Water Temperature D Warning Functions D...

Page 5: ...asures barometric pressure in 1 hPa 1 hectopascal 1 millibar units over a range from 452 hPa to 1050 hPa Equipped with an altitude memo function that enables altitude barometric pressure time and other data to be stored in memory for a maximum of six measurement points Other Functions Temperature measurement function that allows measurement of water tem perature while diving and air temperature on...

Page 6: ...ne or moving to high altitudes without allowing a suitable rest period after diving can cause decom pression sickness bends 1 The buddy system refers to diving in pairs so that each person can look out for the safety of the other 11 2 Use of this Watch CAUTION When using this watch please make sure that you have a thorough under standing of its handling and precautions relating to its use to ensur...

Page 7: ...TED Prohibited Uses During Diving Do not use this watch for diving under the following conditions When the low battery warning function has been activated The second hand of the watch moves at two second intervals when the battery level becomes low When the watch stops or when an abnormality occurs please be careful not to bump the watch on diving equipment rocks or other hard objects When the wat...

Page 8: ...an have detrimental effects on the body such as causing the bends Observe a safe ascent rate at all times Never attempt to operate the crown underwater This can cause a malfunction due to impaired water resistance Caution is required since the alarm may be difficult to hear due to breathing noise underwater After Diving Allow a suitable rest period after diving while referring to the surface mode ...

Page 9: ...f Altimeter and Barometer CAUTION Altitude and Barometric Pressure Measurement Functions The altitude displayed by this watch is approximate altitude as calculated by applying external barometric pressure as detected with a pressure sensor to the relationship between altitude and barometric pressure of an international standard atmospheric model Consequently even when altitude is measured at the s...

Page 10: ... 15 minute intervals In addition this mode is also used to correct altitude to measure alti tude more accurately 19 3 Digital Display The digital display of this watch uses three major modes consisting of the Standard Mode Water Depth Measurement Mode and Altitude Measure ment Mode There are several other modes functions contained in the Standard Mode such as the time calendar and alarm modes Plea...

Page 11: ...e chronograph Split time reset To log memo mode CHR Hours minutes Seconds 1 100 seconds Press once Button A Button B Button M Press for at least 2 seconds Press once Press for at least 2 seconds Press once Press for at least 2 seconds 1 Mode mark 2 Digital display 1 3 Digital display 2 Log Memo Dive Alarm Altitude Memo Surface Recalls the memo Recalls the memo Dive alarm monitor Switches display c...

Page 12: ...he button for at least 2 seconds Press the button once 23 Water Depth Measurement Mode Altitude Measurement Mode 22 4 Button A function display Functions of button A are displayed with marks 5 Button B function display Functions of button B are displayed with marks 6 Crown Used to set analog time Name Mode Water depth measurement mode during measurement Altitude measurement mode during measurement...

Page 13: ...oplets on the watch or when underwater This can allow water to enter inside the watch and impair water resistance 25 5 Setting Analog Time 1 After unscrewing the crown to loosen it pull the crown out The second hand stops when the crown is pulled out 2 Turn the crown to set the time 3 The second hand starts to move when the crown is returned to the normal position 4 Securely screw the crown in to ...

Page 14: ...following order each time button M is pressed Time calendar c alarm c chronograph c log memo c dive alarm c alti tude memo c surface after diving 26 M M M M M M M M Please refer to the section 13 entitled Using the Water Depth Measurement Mode for further details When water sensor gets wet M Water Depth Mea surement Mode preliminary state Altitude Measure ment Mode alti tude correction display Ple...

Page 15: ...f 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 watch to the time calendar mode When none of the buttons are pressed for at least 3 minutes when the watch is in the alarm mode reset state of the chronograph mode log memo mode dive alarm mode or altitude memo mode the watch auto matically returns to the ti...

Page 16: ...f temperature and barometric pres sure returns the watch to the time calendar display Although the measured value of barometric pressure does not change during the time the value is displayed the measured value for temperature is updat ed every 10 seconds A Setting the Digital Time and Date 1 Press button M to switch to the time calendar mode 2 Press button B for at least 2 seconds The display fla...

Page 17: ...canceled when the watch is changed to the Altitude Measurement Mode or when all reset is per formed In this case the change in barometric pressure is displayed start ing on the next hour Barometric pressure is not measured exactly on the hour when using chronograph measurement or when the watch is in the altitude measure ment mode or water depth measurement mode In this case the change in barometr...

Page 18: ...nutes 6 Press button M to return the watch to the normal display If none of the buttons are pressed for about 3 minutes when the display is flashing the watch automatically returns to the normal display Pressing button M when the display is flashing immediately returns the watch to the normal display If none of the buttons are pressed for about 3 minutes when in the alarm mode the watch automatica...

Page 19: ... the chronograph mode 2 Press button A to start or stop the chronograph 3 Press button B when the chronograph is stopped to reset Split Time 1 Press button M to switch to the chronograph mode 2 Press button A to start or stop the chronograph 3 Pressing button B during measurement of elapsed time displays the split time for about 10 seconds The most recent split time is measured and displayed whene...

Page 20: ...emo mode 2 Each time button B is pressed the watch dis plays the four most recent sets of log data start ing with the most recent log data and going back in order 38 Whenever a new dive is started the log data of the oldest of the four sets of log data is automatically deleted It is recommended that you record necessary data in a log book or other record beforehand Number of dive on that date Dive...

Page 21: ...onds It continues measuring elapsed time from 00 sec onds after 100 minutes have elapsed 6 Average depth Average depth for a single dive 7 Minimum water temperature The lowest water temperature for a single dive 41 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 stored in memory is repeatedly displaye...

Page 22: ...hen the alarm sounds for either the depth alarm or dive time alarm it can be stopped by pressing any button Depth Alarm Function The alarm sounds for a maximum of 15 seconds when the set depth is reached while diving After the alarm has sounded once it continues to sound at 1 minute intervals for the set number of times when diving is continued beyond the set depth The alarm stops sounding when th...

Page 23: ...one can be heard in sequence for as long as button A is pressed 45 3 Press button A to set the depth Pressing button A continuously causes the characters to advance rapidly Each time button A is pressed the depth increases by 1 meter 4 Press button B The display indicating the number of times the alarm sounds flashes 5 Press button A to set the number of times the alarm sounds When desiring to hav...

Page 24: ...y stored in memory during altitude measurement A Recalling a Point Memo 1 Press button M to switch to the altitude memo mode 2 The point number changes in order starting with the oldest point memo each time button B is pressed A maximum of six points can be stored in memory as point memos When more point memos are necessary save the new memo in the altitude measurement mode after first deleting al...

Page 25: ...ude memo mode the watch automatically returns to the time calendar mode B Deleting a Point Memo All point memos are deleted by simultaneous ly pressing buttons A and B for at least 2 seconds A tone confirming deletion of point memos sounds at this time Individual point memos cannot be deleted 13 Using the Water Depth Measurement Mode When the water sensor gets wet in any of the standard modes exce...

Page 26: ...ring the after dive 0 m display The watch changes to the water depth measurement display when diving is resumed below a depth of 1 meter within 10 minutes after the previous dive After completion of a dive make sure to carefully wipe off any moisture from the water sensor If the water depth measurement mode is terminated while the water sensor is still wet CHEk is still displayed even after the wa...

Page 27: ...ceeds 1 5 meters in 10 seconds SLOW is displayed on the digital dis play during the time the rapid ascent warning alarm is sounding The alarm continues to sound until a proper ascent rate is achieved 53 52 B Measurement of Dive Time When water depth exceeds 1 0 meter measurement of dive time starts automatically When water depth again becomes less than 1 0 meter measurement of dive time stops Howe...

Page 28: ...abnormal depth and ER and diving time are alternately displayed on digital display 2 This display contin ues until the water depth measurement mode is terminated ER is also displayed when altitude exceeds 4000 meters when on land or when there is an abnormality in the pressure sensor The watch will not switch to the water depth measure ment mode while ER is displayed Water Sensor Check Warning Fun...

Page 29: ...erature of 15 C at sea level Actual atmospheric states are constantly changing with time even at the same location 57 56 If the watch is switched to the altitude measurement mode within 24 hours after the watch entered the surface mode SF ck is ini tially displayed for 10 seconds The watch then switches to the altitude measurement mode This is displayed to urge the wearer to check whether or not a...

Page 30: ...altitude at a location that serves as a reference for correct altitude triangulation point first order leveling point or altitude shown on an accurate map This procedure is referred to as altitude correction Since the altitude displayed on the watch changes by about 10 meters when barometric pressure changes by 1 hPa 1 hectopascal 1 millibar it is necessary to correct altitude several times per da...

Page 31: ... display changes in the order shown on the previous page each time but ton M is pressed Altitude Correction Display The altitude displayed on the watch can be corrected to the actual altitude before and during altitude measurement Continuous Altitude Measurement Display Altitude is measured every second and displayed continuously for 5 minutes allowing changes in altitude to be monitored continuou...

Page 32: ...tude changes during altitude correction the actual altitude and altitude displayed on the watch do not agree thereby preventing altitude from being measured accurately In addition since the altitude and barometric pressure measurements performed by this watch are affected by temperature only perform alti tude correction after allowing the watch to acclimate to the surrounding temperature Deleting ...

Page 33: ...tion altitude measurement display The watch also alternates between display of altitude and barometric pressure dur ing this time Storage of Altitude Memos in Memory 1 Press button A for at least 2 seconds during the continuous altitude mea surement display or fixed duration altitude measurement display A tone confirming button operation sounds and the altitude and barometric pres sure at that tim...

Page 34: ... when measurement is stopped Elapsed time measuring range 0 hours 00 minutes to 23 hours 59 minutes in 1 minute units Measurement repeats after 24 hours have elapsed 67 If none of the buttons are pressed for about 10 seconds after performing the procedure of 1 or 2 above the watch automatically returns to the altitude measurement display Time is not stored in memory if the proce dure of 2 is not p...

Page 35: ...per form the procedure for storing altitude memos in memory 4 1 2 2 Press button M for at least 2 seconds to return to the standard mode This terminates altitude measurement 69 17 Altimeter Applications The following is an introduction to specific applications of the altimeter of this watch Please read the explanations of the uses of each function for further details regarding the respective opera...

Page 36: ...play The altitude displayed when the destination is reached can be read directly from the watch as the difference in altitude between the starting point and destination 70 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 17 18 13 14 2 3 5 6 7 4 8 10 9 11 12 1 13 15 16 17 18 Mt Mauna Kea USA 4 205 m Mt Toubkal Morocco 4 165 m Mt Kosciusko Australia 2 230 m Mt Rainier USA 4 392 m Mt Matterhorn Switzerland 4 477 ...

Page 37: ...ve at two second intervals the second hand advances by two increments in two seconds When this happens have the battery replaced as soon as possible The functions of the watch are restricted according to the conditions described below when the low battery warning function has been activated Alarm and confirmation tones do not sound Temperature cannot be measured in the time mode The watch cannot b...

Page 38: ...ng Bezel The rotating bezel is a rotating ring attached to the watch body It can be used to measured elapsed time while diving Using the Rotating Bezel Turn the rotating bezel to the left and align the mark zero mark with the minute hand before starting the dive Elapsed time can then be read from the minute marks on the rotating bezel to which the minute hand is pointing Example In the illustratio...

Page 39: ...alled No Decompression Limits A table of No Decompression Limits compiled according to the U S Navy Diving Manual 1993 edition is printed on the watchband of this watch there are some models that do not have this table on the watchband Example Read the table as follows In case the maximum dive depth is 21m and the elapsed time is 50 minutes or shorter the diver is not required to take a rest for d...

Page 40: ...is recommended that you have the battery replaced and any necessary maintenance per formed prior to traveling overseas Battery replacement and any accompanying inspections or parts replacement are performed at normal service rates even during the warranty period 79 20 Battery Battery Life The battery life of this watch is approximately 2 years after a new battery has been installed Typical Conditi...

Page 41: ...ay being incorrect or the alarm sounding continuously When this happens perform the all reset procedure as described in Section 23 All Reset If the problem is still not resolved even after the all reset procedure has been performed please consult your nearest Citizen Service Center 81 21 Troubleshooting When the Second Hand Moves at Two Second Intervals The low battery warning function is activate...

Page 42: ...IR DIVER S 200M 22 Care for Long Term Use WARNING Water Resistance Performance This watch is water resistant to 200 meters Although it can be used for air diving using an air tank scuba diving it cannot be used for saturation diving involving the use of helium gas Maintaining Water Resistance Please have your watch inspected at a Citizen Service Center once every 1 2 years to maintain water resist...

Page 43: ...nded that you use an underwater flashlight to apply light to the watch during diving 85 CAUTION Be sure to use the watch with the crown pressed in normal position If your watch has a screw type crown be sure to tighten the crown completely Do NOT operate the crown with wet fingers or when the watch is wet Water may enter the watch and compromise water resistance If moisture has entered the watch o...

Page 44: ...efrigerator door a handbag clasp or the earphone of a mobile phone If this has occurred move the watch away from the magnet and reset the time 87 CAUTION Keep your watch clean Dust and dirt tend to collect in gaps in the back of the case or band Accu mulated dust and dirt may cause corrosion and soil your clothing Clean the watch occasionally Cleaning the Watch Use a soft cloth to wipe off dirt pe...

Page 45: ... each mode 89 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 electricity such as is emitted from a TV screen Do NOT subject the watch to a strong shock such as dropping it onto a hard floor Avoid using the watch in an environment where it may be exposed to chemicals or corrosive gases ...

Page 46: ...ed with the previous memo Surface mode Measurement of elapsed time after diving 24 hour time keeping system 91 24 Specifications 1 Model C900 2 Timekeeping accuracy Within 20 seconds per month when worn at nor mal temperatures of 5 C to 35 C 3 Water depth measurement accuracy 3 of displayed value 30 cm pro vided that the working temperature is constant Guaranteed accuracy temperature range 10 C to...

Page 47: ... minutes 59 sec onds 1 second units 8 Other Functions Altitude correction function barometric pressure change display water sensor rapid ascent warning function abnormal depth warn ing function water sensor check warning function low battery warn ing function and button function display 9 Battery Used Lithium battery 1 pc 10 Battery Life Approx 2 years after installing a new battery refer to Secti...