72
FT
A
S
NITROXNITROX
DIVE TIME REMAINING (DTR)
One of the most important pieces of information on the ReACT Pro is the patented DTR numeric
display. The ReACT Pro constantly monitors decompression status and oxygen accumulation.
The DTR display will indicate the time that is more critical for you at that particular moment (i.e.;
whichever time is the least amount available of the two).
This unique feature has been granted U.S. Patent No. 4,586,136.
No Deco DTR is the maximum amount of time that you can stay at your present depth before en-
tering decompression. It is calculated based on the amount of nitrogen absorbed by 12 hypotheti-
cal tissue compartments. The rates each of these compartments absorb and release nitrogen is
mathematically modeled and compared against a maximum allowable nitrogen level. Whichever
one of the 12 is closest to this maximum level is the controlling compartment for that depth. Its
resulting value will be displayed with the NDL icon (Fig. 72a) and graphically as the NiBG.
As you ascend from depth following a dive that has approached the No Deco limit, the NiBG will
recede as control shifts to slower compartments. This is a feature of the decompression model that
is the basis for multilevel diving, one of the most important advantages the ReACT Pro offers.
The decompression algorithm is based upon Haldane’s theory using maximum allowable nitrogen
levels developed by Merrill Spencer. Repetitive diving control is based upon experiments de-
signed and conducted by Dr. Ray Rogers and Dr. Michael Powell in 1987. Diving Science and
Technology
®
(DSAT), a corporate affiliate of PADI
®
, commissioned these experiments.
Fig. 72 - No Deco DTR
a
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