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PRECAUTIONS FOR DIVING
● Strictly observe the precautions below to enjoy safe diving with the SEIKO Diving Computer Cal. DH33.
● Do not stay underwater beyond the no-decompression limits.
● When you have descended below 15 m (50ft), be sure to make
a safety stop in ascent at 3 to 6 m (10 to 20 ft). If the watch gives
a decompression warning, it is recommended that you stay at
the decompression stop depth longer than the stop time that
the watch indicates.
* While making a decompression stop, be sure to check the
amount of air remaining in your tank.
● The watch does not indicate the amount of air in your tank.
Use a submersible pressure gauge to check it.
● For safety’s sake, use other diving equipment such as dive
computer, depth gauge and another diver’s watch together
with the watch.
● The watch cannot serve as your “buddy”. Abide by the rules
of scuba diving, and never dive alone even if you have the
watch on your wrist.
● Abrupt change of altitude after diving is extremely hazardous
to your health. Do not move across the altitude ranks that the
watch indicates.
● Check that:
• the watch is operating normally.
• there are no visible scratches or cracks in the band and
crystal.
• the band is securely fastened to the watch case.
• the battery life indicator (battery mark) is not shown on
the display.
• all segments of the display are not flashing.
• the altitude rank mark is not flashing.
• not all nine residual nitrogen indicator bars are lit up.
* If you find any malfunction, do not use the watch for diving.
IN GENERAL
BEFORE DIVING
● If the temperature of the watch is much higher than that of the
water, for example, after having been left under direct sunlight
before being put in water, the watch may not measure the
depth of water accurately. Soak it in water for approximately
5 minutes before using it for diving.
● Be sure to check that the actual percentage of oxygen in your
tank (FO
2) is properly set for the watch. FO2 cannot be
readjusted while you are underwater.
● Check that the measurement units of depth and temperature
are set according to your requirement. They can be selected
from “meters (m) and centigrade (° C)” and “feet (ft) and
Fahrenheit (° F)”.
● Take care not to hit the watch against hard objects such as
rocks.
● Check that the watch indicates the current depth properly. If
“- - -” or “Err” is shown when the current depth is less than 100
m (329 ft), stop using the watch immediately, and use other
diving equipment such as diving computer, depth gauge and
another diver’s watch you have with you.
● While in the dive mode, the display cannot be changed over to
modes other than time/calendar by pressing button “C”.
● Depending on the aquatic environment where the watch is
used, the beeping sound of the regular alarm and warnings
may or may not reach your ears.
● The watch measures the depth of water on the basis of
seawater having a specific gravity of 1.03. When it is used in
fresh water such as lakes, therefore, the displayed depth
should be corrected by multiplying it by 1.03. No-
decompression limits, however, will be calculated and
displayed normally without any adjustment.
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:
WHILE DIVING