Seiko DH33 Manual - Page 9

English HOW TO USE DIVE COMPUTER FUNCTIONS ■ DIVE FUNCTION ● 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 automatically measures depth, water temperature and dive time, and provides the information necessary for diving including warnings on hazards. WARNING ● Before making a dive, be sure to check the function of your watch, following the instructions set forth in "BEFORE DIVING" in "PRECAUTIONS FOR DIVING" on page 4. ● Also, be sure to set FO2 according to the gas mixture of your scuba tank. FO2 cannot be re-adjusted while you are underwater. ● Select the measurement units of depth and temperature as you require. They cannot be selected while you are underwater. DISPLAY WHILE DIVING During no-decompression diving Residual nitrogen indicator No-decompression limit Dive time Oxygen limit indicator FO2 you have set Current depth Current time Maximum depth Water temperature Press to illuminate the display for 2 to 3 seconds. * The illuminating light will not stay lit if the button is kept 16 pressed. Partial pressure of oxygen (PO2) Press and hold to display current time, partial pressure of oxygen (PO2) and data. * The display is illuminated for 2 to 3 seconds. English HOW TO USE DIVE COMPUTER FUNCTIONS After no-decompression limit reaches "0" (during decompression diving): ● Never dive beyond the no-decompression limit. Residual nitrogen indicator Dive time Decompression stop depth Decompression stop time Current depth Total ascent time ★ Decompression diving mark ● When the no-decompression limit reaches "0" while diving, all the residual nitrogen indicators are displayed to indicate that the watch has shifted to decompression diving mode. ● After you make decompression stops as indicated by the watch, it will resume calculation of no-decompression diving. ★ Total ascent time refers to the minimum time required to stay underwater before surfacing, including the decompression stop time at the indicated decompression stop depths. WARNING ● Do not make a decompression stop at a depth shallower than the decompression stop depth the watch indicates. It is in violation of the decompression stop warning, and the watch will not count down the decompression stop time and total ascent time even if you make a stop during ascent. ● Even after the watch has given a decompression stop violation warning, it will resume calculation of nodecompression diving if you return to the indicated decompression stop depth and make a decompression stop as indicated by the watch. If you continue ascending and surface, defying the warning, the watch cannot be used for diving for 48 hours. During that time period, the watch is not set to calculate decompression diving, and only the surface interval and dive log displays are shown. If the aquatic environment permits, it is recommended that you make a decompression stop at a depth 1 to 2 m (3 to 7 ft) deeper than the indicated decompression stop depth. In that case, take care that you should stay at the depth for a longer time period than the decompression stop time that the watch indicates. 17