Seiko DH33 - Manual (Page 12)

22
English
23
English
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 water (specific gravity
1.00), the actual depth is:
19.4 m (64 ft) x 1.03/1.00 = 20.0 m (66 ft)
No-decompression limits and residual
nitrogen the watch provides are calculated
on the basis of water pressure only, and can
be used while diving in fresh water without
any conversion.
The watch measures and indicates dive time
in one minute increments up to 599 minutes.
It starts measuring the time when the diver
descends more than 1.5 m (5 ft), and stops
when the diver ascends to a depth of less
than 1.5 m (5 ft).
Terms Definition and basic design of the watch
Depth
Dive time
(DIVE. T)
Definition and basic design of the watch Terms
The watch measures the water temperature
in 0.1° C (1° F) increments from -5.0° C up to
+40.0° C (23° F up to 104° F). The water
temperature recorded in the dive log function
is a measurement taken at the maximum
depth.
Water
temperature
Surface
interval
time
(SURF. T) The watch measures the time spent on the
surface in one minute increments up to 48
hours, starting from the time when the diver
ascends to a depth of less than 1.5 m (5 ft).
If the diver descends to a depth of greater
than 1.5 m (5 ft) when the surface interval
time is less than 10 minutes, the previous
a n d t h e n e w d i v e s a r e c o n s i d e r e d
inseparable, and the dive times of both dives
and the surface interval time are added
together.
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
Even if the dive function is started by measuring a depth greater than
1.5 m (5 ft), a dive that lasts less than 3 minutes will not be recorded.
●
How to erase the log data in memory
The entire log data stored in memory can be erased as
required.
Press to show DIVE LOG display.
Press to show LOG DATA ERASURE display.
▼
▼
▼
Press to return to DIVE LOG display.
and Press and hold at the same time.
• Flashing quickly.
* “LoG-CLE” flashes quickly and then stops flashing after a
few seconds, indicating that the entire log data has been
erased from memory.
• No log data is
stored in
memory.
▼
The watch uses an algorithm developed by
Mr. Randy Bohrer, one of the most
distinguished scientists in this field, which
expands upon the theories of the so-called
Swiss model. Algorithm
De-
compression
diving The watch is intended for use in no-
decompression diving (diving which allows
you to make a direct, continuous ascent to
the surface). Anticipating emergencies, it
provides information for decompression
diving.
* Decompression diving refers to diving which
requires stops at specified depths during
ascent, due to an impermissible amount of
nitrogen having accumulated in the diver’s
body.
• Remains displayed.
• Flashing “LoG-
CLE” appears.
HOW TO USE DIVE COMPUTER FUNCTIONS