Cochran Nemesis IIa NITROX, Руководство пользователя

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BP:
Breathing Parameter (BP) is a measure of your breathing efficiency. The more you
dive, the more efficient your breathing becomes. With your dive computer, you will be
able to monitor and log your progress. The number displayed is the amount of air you
breathe per minute in psi normalized to the surface (one atmosphere). This data is
sometimes referred to as Surface Air Consumption (SAC). Since Breathing Param-
eter is a “parameter”, it remains in psi per minute regardless of metric or imperial
calculations. Via the optional Analyst, you can also select Breathing Parameter to
display liters per minute.
By eliminating the variable of depth, you will easily be able to compare your breathing
rate from depth to depth and dive to dive. As you know, the amount of actual air you
breathe per minute varies proportionate with depth even if your breathing rate remains
unchanged. By normalizing your breathing rate to the surface, an immediate compari-
son of the rates can be made. For example, let’s say that you made two dives, the first
to 99 feet and the second to 66 feet. Lets also assume that your breathing rate was the
same on both dives; and using the previous example, lets say your BP displayed 23,
indicating your breathing rate as 23 psi per minute normalized to the surface. If depth
entered the equation, your 99 foot dive would display a BP of 92 (23 x 4ATM’s = 92)
while the dive to 66 feet would display a BP of 69 (23 x 3ATM’s = 69). With your dive
computer, you can immediately see that your rate remained unchanged from the first to
second dive. If the actual psi per minute breathed at depth was displayed, you would
have seen two very different numbers, 92 and 69, and you would then have to calculate
further to achieve a comparison.
Since BP is computed by monitoring the drop in tank pressure, a larger volume tank will
show a more efficient BP while the BP of a smaller tank will be less efficient. For normal,
casual sport SCUBA diving on a 10-litre (80 cubic foot tank), a BP of between 18 and 35
is considered normal. Breathing Parameter is computed and updated only at depths
below ten feet.
Subsurface Mode: The averaged Breathing Parameter for the dive in progress is dis-
played.
Logbook Mode: The average BP for the profile view is provided.
Ceiling:
Logbook Mode: This will show whether or not the dive profile viewed was a no-
decompression dive. If you entered Emergency Decompression Mode on
that particular dive, the CEILing would display the deepest stop that was
required.
Emergency Decompression Mode: The depth above which you must not ascend when
in the Emergency Decompression Mode.
Subsurface Mode: When making a no-decompression dive, the CEILing should read 0
indicating that you may make a direct ascent to the surface without completing
any decompression stops. Should you enter into a decompression situation,
the CEILing will indicate, in feet or meters, the depth to which you must ascend
and complete a Decompression Stop.