Seiko DH33 - Manual (Page 9)

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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, 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
s t a y u n d e r w a t e r b e f o r e s u r f a c i n g , i n c l u d i n g t h e
decompression stop time at the indicated decompression
stop depths.
● 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 no-
decompression 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.
WARNING
● 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 FO
2 according to the gas mixture of
your scuba tank. FO 2 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
Residual nitrogen indicator Oxygen limit indicator
During no-decompression diving
No-decompression limit Dive time
Current depth
Water temperature Maximum depth
Press to illuminate the display for 2 to 3 seconds.
* The illuminating light will not stay lit if the button is kept
pressed.
Press and hold to display current time, partial
pressure of oxygen (PO
2 ) and data.
* The display is illuminated for 2 to 3 seconds.
Current time
Partial pressure of
oxygen (PO
2 )
FO 2 you have set
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English ■ DIVE FUNCTION
HOW TO USE DIVE COMPUTER FUNCTIONS HOW TO USE DIVE COMPUTER FUNCTIONS