Mailing List Archive Mailing List Archive
Thursday, Sep 12, 1996 08:16 AM
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How Ya Doin' pierrec@MI*.co*
I have found that it dosn't really matter about the breathing rate with these
integrated computers!!! Why??? Because everytime you dump a little air into
your BCD it counts that as well. When I look at my profiles (Nemisis II) the
Breathing rate is way up as I am descending to 200' then it evens out for a
while but once I switch to a deco mix it goes to zero. Bottom line there is a
real small window of acurate data so I ignore this information as it is
useless.
>Hello all,
>How does the Air-X Datatrack software calculate the breathing rate? I
>mean the software running on a PC that comes-up with cubic feet per
>minutes.
>The computer has access to the fulll [I must read too much mail from
>George :)] dive profile, the size of the tank (e.g. 80 cf) and the PSI
>used during the dive. HOWEVER, and this is the problem, it does not have
>access to the pressure at which the tank is rated (e.g. 80 cf @ 3000
>PSI).
>Example 1: Do exactly identically the same dive, once with a Genesis 80
>(rated approx 80 cf at 3500 PSI) and with a standard Aluminum tank
>(rated approx 80 cf @ 3000 PSI). The software has no way of knowing the
>difference between the two tanks. If you were to breathe 2000 PSI during
>the dive, you would use 45.7 cf on the Genesis and 53.3 cf on the
>Aluminum tank.
>Example 2: Same, with either a Genesis 100 (100 cf @ 3500 PSI) or a low
>pressure steel 100 (100 cf @ 2640 PSI). If you use 2000 PSI, you use
>57.1 cf on the Genesis compared to 75.8 on the low pressure tank...
>quite a jump.
Later friend!, ��~
{Ray LaTulippe}
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