Seiko DH33 Manual - Page 4

English FEATURES 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. DIVE COMPUTER FUNCTIONS ■ Algorithm ● The watch has an algorithm that calculates multilevel diving. ● The watch uses an algorithm developed by Mr. Randy Bohrer, one of the most distinguished scientist in this field, which expands upon the theories of the so-called Swiss model. ■ Dive function ● The watch is equipped with an auto switch that senses water and activates the dive function. ● The diving data is measured automatically while diving between 1.5 m (5 ft) and 99.9 m (328 ft), eliminating the need for any button operation. ● The residual nitrogen and residual oxygen are indicated graphically for a quick grasp of the current safety situation. ■ Altitude compensation ● The watch measures the current altitude automatically, calculating the residual nitrogen and other data for the next dive taking into account the altitude change following an air flight or move to high ground. ■ Nitrox diving function ● The watch can provide data for nitrox diving. ● The percentage of oxygen (FO2) in the gas mixture of your scuba tank can be set for the watch from 22% to 50%. ■ Dive plan function ● No-decompression limits are calculated, automatically taking into consideration the current residual nitrogen and altitude. ● This mode is convenient for planning the next dive. ■ Dive log function 6 ● Details of up to 30 dives are recorded automatically. ● The log data includes date of dive, entry/exit time, dive time, maximum depth, FO2 setting (percentage of oxygen in gas mixture), and residual nitrogen/oxygen at the end of dive. ● The measurement units of depth and temperature can be selected from "meters (m) and centigrade (° C)", and "feet (ft) and Fahrenheit (° F)". TIME FUNCTIONS ■ Time/calendar function ● Hour, minutes, seconds, month, date and day are displayed. ■ Fully automatic calendar ● The calendar adjusts automatically for odd and even months including February of leap years up to 2050. ■ Regular alarm function ● The alarm can be set to ring once a day at a designated time. Hourly time signal and alarm test functions are also provided. ■ Hour correction function ● When you are traveling around different time zones, the time and calendar of the place you visit can be shown easily with only the press of a button. The time can be adjusted in 30 minute increments, making it available for those areas having a time difference in 30 minute increments from GMT. OTHER FUNCTION ■ Illuminating light (Electroluminescent panel) ● Certain materials emit light when voltage passes through them. This phenomenon, known as "electroluminescence", is used to illuminate the display. ● With the press of a button, the light illuminates the display for 2 to 3 seconds for easy viewing in the dark. English BUTTONS AND DISPLAY CHANGE ● Other than in the DIVE mode, the display changes in the following order by pressing button . * The display indicator " " shows to which display the watch is set. * If the watch is left untouched in any of the displays other than TIME/CALENDAR and DIVE, the display will automatically return to the TIME/CALENDAR in 5 to 6 minutes. TIME/CALENDAR function Press button . REGULAR ALARM function ➟ • Displaying time, calendar (month, date and day) and designated alarm time Press button . HOUR CORRECTION function ● When you make a dive, the auto switch (water contact sensor) works to change over the mode to DIVE automatically. Pressure sensor Auto switch (Water contact sensor) ➟ • Setting regular alarm and turning on/off hourly time signal Press button . NITROX DIVING function • Adjusting the time difference • Setting percentage of oxygen (FO2) ➟ ➟ Press button . DIVE LOG function • Recalling log data DIVE function Press button . Press button . DIVE PLAN function • Planning the next dive 7