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Seiko Group DH33 - page 1
INSTRUCTIONS (P. 2) BEDIENUNGSANLEITUNG (S. 30) INSTRUCTIONS (P. 58) ISTRUZIONI (P. 86) Cal. DH33 INSTRUCCIONES (P. 118) INSTRUÇÕES (P. 146) ! (174 ) You are now the proud owner of a SEIKO Diving Computer Cal. DH33. For best results, please read the instructions in this booklet carefully before using your SEIKO Diving Computer. Please ...
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Seiko Group DH33 - page 2
2 English ENGLISH WARNING The SEIKO Diving Computer Cal. DH33 is intended for use in an inherently hazardous form of recreation. Therefore, it is absolutely essential that you strictly observe all instructions for the use and maintenance of the watch set forth in this manual. First of all, this watch is for use in recreational (no-decompression) di ...
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Seiko Group DH33 - page 3
English 3 WARNING WARNING notes indicate any condition or practice which, if not strictly observed, could result in severe personal injury or possible death. CAUTION CAUTION notes indicate any condition or practice which, if not strictly observed, could result in personal injury or property damage. decompression sickness and other hazards, and are ...
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Seiko Group DH33 - page 4
4 English PRECAUTIONS FOR DIVING ● Strictly observe the precautions below to enjoy safe diving with the SEIKO Diving Computer Cal. DH33. ● Do not stay underwater beyond the no-decompression limits. ● When you have descended below 15 m (50ft), be sure to make a safety stop in ascent at 3 to 6 m (10 to 20 ft). If the watch gives a decompression ...
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Seiko Group DH33 - page 5
English 5 19.4 m x 1.03/1.00 ≒ 20.0 m (66 ft) ● Be sure to rinse the watch in fresh water, and wash out all seawater, soil, sand, etc. ● After cleaning the watch in fresh water, be sure to wipe it thoroughly dry. ● If the watch is left soaked in water for a long time for removing salt or other purposes, the auto sensor function is activated ...
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Seiko Group DH33 - page 6
6 English The SEIKO Diving Computer Cal. DH33 is a digital diver’s watch featuring dive computer functions. An algorithm is programmed into it to calculate multilevel diving. FEATURES DIVE COMPUTER FUNCTIONS ■ Algorithm ● The log data includes date of dive, entry/exit time, dive time, maximum depth, FO 2 setting (percentage of oxygen in gas m ...
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Seiko Group DH33 - page 7
English 7 BUTTONS AND DISPLAY CHANGE ● Other than in the DIVE mode, the display changes in the following order by pressing button . A TIME/CALENDAR function • Displaying time, calendar (month, date and day) and designated alarm time • Setting regular alarm and turning on/off hourly time signal REGULAR ALARM function • Adjusting the time dif ...
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Seiko Group DH33 - page 8
8 English Press to show TIME/CALENDAR display. A Press to show TIME/CALENDAR SETTING display. B TIME/CALENDAR SETTING • Regular alarm time is displayed only when it is set. A B C D ● The time/calendar setting cannot be made for 10 minutes after a dive. * If the watch is left untouched in the TIME/CALENDAR SETTING display, the display will autom ...
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Seiko Group DH33 - page 9
English 9 ● The alarm can be set to ring once a day at a designated time. ● Once the alarm is set, the set time is shown in the TIME/CALENDAR display. ● Alarm can be tested. ● Hourly time signal is provided. REGULAR ALARM SETTING Press to show REGULAR ALARM display. A Press to show REGULAR ALARM SETTING display. B Press to set the flashing ...
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Seiko Group DH33 - page 10
10 English ● How to stop the regular alarm The regular alarm rings at the designated time for 20 seconds and stops. While the alarm is ringing, the regular alarm mark flashes. To stop them manually, press button , , , or in any display. ● Alarm test Press and hold buttons and at the same time in the REGULAR ALARM or TIME/CALENDAR display. C D N ...
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Seiko Group DH33 - page 11
English 11 HOW TO USE THE HOUR CORRECTION FUNCTION Press to show HOUR CORRECTION display. A Press to show TIME DIFFERENCE SETTING display. B C or D Press to set the time/calendar of the place you visit. C D • “+” and “–” appear near buttons C and D, respectively. B A Current time ● When you travel around different time zones, the time ...
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Seiko Group DH33 - page 12
12 English HOW TO SET FO 2 Press to show FO 2 display. A Press to show FO 2 SETTING display. * For diving with ordinary air, set “Air” for FO 2 . B B A Percentage of oxygen “Air”: 21% for diving with ordinary air Press to return to FO 2 display. B C or D Press to set FO 2 . * With each press of buttons C and D, the percentage is increased a ...
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Seiko Group DH33 - page 13
English 13 Notes: 1. For 10 minutes after a dive, FO 2 setting cannot be made. 2. If the watch is left untouched in the FO 2 SETTING display, the display will automatically return to the FO 2 in 1 to 2 minutes. When the nitrox mark “Nx” is flashing: Nitrox mark ● If FO 2 was set for nitrox diving the previous day and the date has changed to t ...
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Seiko Group DH33 - page 14
14 English ● This watch has a built-in pressure sensor to measure the altitude (above sea level) and indicates the altitude rank graphically in four levels. ● Residual nitrogen, no-decompression limits for the next dive and other data are calculated taking into account the current altitude. ● As you move across altitude ranks, the watch re-ca ...
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Seiko Group DH33 - page 15
English 15 Notes: 1. The display cannot be changed over to the DIVE PLAN for 10 minutes after a dive. 2. Please note that it may take some time to calculate no- decompression limits. 3. During surface interval: While the watch counts down the desaturation time during surface interval, surface time and desaturation time are also shown in the DIVE PL ...
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Seiko Group DH33 - page 16
16 English ● The auto switch (water contact sensor) senses water and automatically activates the DIVE FUNCTION, showing the DIVE display. There is no need to change the displays manually. ● As you descend to 1.5 m (5 ft) underwater, the watch starts showing the current depth and measuring the diving time. ● During a dive, the watch automatica ...
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Seiko Group DH33 - page 17
English 17 After no-decompression limit reaches “0” (during decompression diving): ● Never dive beyond the no-decompression limit. Residual nitrogen indicator Dive time Current depth Total ascent time Decompression stop depth Decompression stop time Decompression diving mark ● When the no-decompression limit reaches “0” while diving, al ...
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Seiko Group DH33 - page 18
18 English Indication Description Warning Ascent rate warning (flashing) WARNINGS DURING A DIVE If you ascend in water at a rate greater than the specified one, flashing “SLOW” appears for 5 seconds and the warning sound beeps for 3 seconds. Three rates are specified depending on the depth level. 0.0 ~ 5.9 m (0 ~ 19 ft) : 8 m (26 ft)/min 6.0 ~ ...
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Seiko Group DH33 - page 19
English 19 DISPLAY AFTER A DIVE Current depth When you are less than 1.5 m (5 ft) underwater and the auto switch senses water: ● The watch shows the dive display with the current depth being “0.0 m (0 ft)”. ● If the watch shows the dive display after you surface, check that water does not remain on the auto switch. ● If the watch measures ...
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Seiko Group DH33 - page 20
20 English ● The log data recorded automatically while diving can be recalled. ● The stored data includes almost all the data necessary for keeping in log books. ● Log No., date of dive, entry time, exit time, dive time, dive No. on that day, percentage of oxygen, average depth, maximum depth and water temperature at maximum depth are display ...
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Seiko Group DH33 - page 21
English 21 WARNINGS SHOWN IN DIVE LOG DISPLAY Indication Description Warning Ascent rate warning It appears if the rate of ascent has exceeded the specified value two times in a row. (flashing) Decompression warning It appears if you have exceeded no-decompression limit and have made a decompression stop. (flashing) Decompression stop violation war ...
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Seiko Group DH33 - page 22
22 English When more than 30 dives are made: ● If a new dive is made when log data of 30 dives are stored in memory, the log data for the oldest dive is erased from memory and the data for the new one is recorded in memory. ● In that case, log No. for the existing data will be reduced by one. Dive that is not recorded in the dive log function E ...
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Seiko Group DH33 - page 23
English 23 USE OF TERMS IN THIS MANUAL DEFINITION OF THE TERMS AND BASIC DESIGN OF THE WATCH The watch measures the depth of water from 1.5 m (5 ft) up to 99.9 m (328 ft) in 0.1 m (1 ft) increments. The measurement is made on the basis of seawater having a specific gravity of 1.03. Ex.) If the displayed depth of the water is 19.4 m (64 ft) in fresh ...
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Seiko Group DH33 - page 24
24 English EXPLANATION OF THE TERMS Explanation Terms No-de- compression limit (NDL) The maximum time during which the diver can stay at the current depth or in the selected depth rank without decompression procedure. The watch indicates NDL up to 200 minutes. In the DIVE PLAN display, if you choose a depth rank where the partial pressure of oxygen ...
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Seiko Group DH33 - page 25
English 25 EXPLANATION OF THE TERMS Terms Explanation Terms Explanation The watch measures the water temperature every minute in 0.1 ° C (1 ° F) increments from -5.0 ° C up to +40.0 ° C (23 ° F up to 104 ° F). If the measurement is outside the range, “Lo” or “Hi” is displayed. The water temperature at the maximum depth is recorded in ...
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Seiko Group DH33 - page 26
26 English BATTERY CHANGE 3 Y ears The miniature battery which powers your watch should last approximately 3 years . However, because the battery is inserted at the factory to check the function and performance of the watch, its actual life once in your possession may be less than the specified period. When the battery expires, be sure to replace i ...
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Seiko Group DH33 - page 27
English 27 TO PRESERVE THE QUALITY OF YOUR WATCH Your watch works with stable accuracy within a temperature range of 5 ° C and 35 ° C (41 ° F and 95 ° F). Temperatures over 60 ° C (140 ° F) or below –10 ° C( + 1 4 ° F) may cause a slight time loss or gain or battery leakage or shorten the battery life. However, the above conditions will b ...
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Seiko Group DH33 - page 28
28 English TROUBLESHOOTING Problem Possible cause Solution The watch gains/loses occasionally. The accuracy will be corrected when the watch returns to normal temperature. Set the time before using the watch. It is so adjusted that it operates with stable accuracy when used on the wrist within a temperature range between 5 ° C and 35 ° C (41 ° F ...
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Seiko Group DH33 - page 29
English 29 Problem Possible cause Solution The watch calculates decompression diving even after a dive. The diver ascended defying the decompression stop violation warning. When the surface interval time is less than 5 minutes, making a decompression stop as indicated by the watch will return the display for no-decompression diving. ** The log data ...
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