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Seiko DH33 Manual

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English
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English
EXPLANATION OF THE TERMS
Terms Explanation Terms Explanation
The watch measures the water temperature
every minute in 0.1° C (1° F) increments from
-5.0° C up to +40.0° C (23° F up to 104° F). If
the measurement is outside the range, “Lo”
or “Hi” is displayed.
The water temperature at the maximum
depth is recorded in the dive log function.
Current
water
temperature
Water
temperature
at maximum
depth
Residual nitrogen at the end of a dive is
recorded in the dive function and indicated
graphically by the number of bars.
Residual oxygen at the end of a dive is
recorded in the dive function and indicated
graphically by the number of bars.
The depth at which the diver should make a
decompression stop. It is calculated on the
basis of the diving data collected during the
dive, and selected from 15, 12, 9, 6 and 3 m
(50, 40, 30, 20 and 10 ft). If the diver ascends
to a depth shallower than the indicated depth,
a decompression stop violation warning is
given.
Residual
nitrogen at
end of dive
Residual
oxygen at
end of dive
De-
compression
stop depth
The time period during which the diver
should stay at the decompression stop depth.
It is calculated on the basis of the diving data
collected during the dive, and is counted
down while the decompression stop is being
made.
De-
compression
stop time
The minimum time required to stay
underwater before surfacing, including the
decompression stop.
Total
ascent
time
PO2 is calculated on the basis of the depth
and the FO2 setting (percentage of oxygen in
gas mixture). When PO2 exceeds 1.5, a
warning is given.
PO2
(Partial
pressure of
oxygen)
The amount of excess oxygen in the diver’s
body is indicated graphically in 9 levels by
the number of bars shown on the display.
In nitrox diving, the diver is exposed to
higher levels of oxygen. If all the indicator
bars light up, ascend to a shallower depth,
as you are in danger of suffering from oxygen
toxicity.
Oxygen
limit
indicator
EXPLANATION OF THE TERMS
ExplanationTerms
No-de-
compression
limit (NDL)
The maximum time during which the diver
can stay at the current depth or in the selected
depth rank without decompression
procedure. The watch indicates NDL up to
200 minutes.
In the DIVE PLAN display, if you choose a
depth rank where the partial pressure of
oxygen exceeds 1.6, “– –” is displayed in
place of NDL.
The pressure sensor measures the
atmospheric pressure at regular intervals,
and the watch indicates the altitude rank in
four levels from 0 to 3. The measurable
range of altitude is 0 ~ 6,000 m (19,700 ft). If
the measurement is outside this range, the
altitude rank indicator flashes.
Terms Explanation
Altitude
rank
The amount of nitrogen absorbed by the
diver’s body is indicated graphically in 10
levels from 0 to 9 by the number of bars
shown on the display. When all 9 indicator
bars light up, the watch calculates
decompression diving.
Residual
nitrogen
indicator
The time required for the excess amount of
nitrogen accumulated in the diver’s body
during a dive to be eliminated completely. It
is indicated in hours and minutes, and the
watch counts it down. Desaturation is
considered to be completed when the
countdown is over.
Desaturation
time
FO2
(Percentage
of Oxygen)
The percentage of oxygen in the gas mixture
of the scuba tank, which the diver needs to
set for the watch before diving. For diving
with air, “Air” (21%) should be set. FO2 can
be set from 22% to 50%, and if a value within
this range is set, the watch calculates nitrox
diving, and the nitrox mark “Nx” is shown
on the display. The set FO2 is recorded in the
dive log function.
If the watch is left untouched with “Nx”
shown on the display after a dive, it starts
flashing on the next day to indicate that FO2
should be re-set. Otherwise, “– –” is shown
in place of the previous FO2 setting, and the
watch cannot be used for diving.
Nitrox
mark
Depth rank For planning a dive, the depths from 9 m to
48 m (30 ft to 160 ft) are divided into 14 ranks
in 3 m (10 ft) increments.
The order of diving data stored in memory.
Details of up to 30 dives can be recorded.
The log data of a dive is shown in two
separate displays. They have different log
Nos. such as “30-1” and “30-2”.
Log No.
The number of dives made on the same day.
It is recorded in the dive log function.
Number of
dives on
that day
The time when the dive is started. The watch
records the time when the diver descends to
a depth of more than 1.5 m (5 ft).
Entry time
Exit time The time when the dive is finished. It
corresponds to the hour and minute when
the diver ascends to less than 1.5 m (5 ft)
underwater.
The average depth is calculated from the
depth data measured during a dive. It can be
checked in the dive log function.
Average
depth
The greatest measurement of depth during
a dive.
Maximum
depth
… 13


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