Seiko DH33 - Manual (Page 4)

6
English
7
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
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.
■ 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.
■ Fully automatic calendar
● The calendar adjusts automatically for odd and even months
including February of leap years up to 2050.
OTHER FUNCTION
● 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.
■ 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 (FO
2 ) 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
● Details of up to 30 dives are recorded automatically.
■ 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.
■ 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.
BUTTONS AND DISPLAY CHANGE
● Other than in the DIVE mode, the display changes in the following order by pressing button .
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
difference
• Setting
percentage of
oxygen (FO
2 )
NITROX DIVING function HOUR CORRECTION function
Press button .
➟
Press button .
➟
• Recalling log
data
• Planning the next
dive
Press button .
➟
Press button .
➟
DIVE PLAN function DIVE LOG function
Press button .
Auto switch
(Water contact
sensor)
Pressure sensor
DIVE function
● When you make a dive, the auto
switch (water contact sensor)
works to change over the mode
to DIVE automatically.
Press 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.