Manual Tusa Imprex II IQ400 (page 11 of 47) (English)

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Dive Computer Limitations

While the IQ-400 is based on cur-

rent decompression research and

technology, the user/ diver must

realize that the computer cannot

monitor the actual physiological

functions of an individual diver.

All decompression schedules cur-

rently known to the authors,

including the U.S. Navy Tables, are

based on a theoretical mathemati-

cal model which is intended to

serve as a guide to reduce the probability of decompression sickness.

The mathematical model uses an ascent rate of 10 m/min [33 ft/min].

Therefore it is critical that a proper ascent rate is always used.

The reader/diver is forewarned that individual physiological differences, severe

environmental conditions and predive activities, especially those which tend to

increase dehydration, may increase the risk of decompression sickness.

As a safety precaution TUSA recommends that divers using the IQ-400 should

maintain no less than 10 minutes no-decompression time remaining at all

WARNING

DIVE PRACTICES WHICH INCLUDE THE ABOVE

DESCRIBED “HIGHER RISK DIVE PROFILES” ARE

BELIEVED TO INCREASE THE RISK OF DECOMPRES-

SION SICKNESS AND AS SUCH CONSIDERED POTEN-

TIALLY DANGEROUS AND SHOULD BE AVOIDED EVEN

IF THEY CONFORM TO THE MATHEMATICAL MODEL!

WARNING

DO NOT USE THE IQ-400 WITH NITROX MIX!

The mathematical tissue calculation model of the IQ-400 has

been designed for use with standard breathing air only (approxi-

mately 21% oxygen and 79% nitrogen by volume). Therefore,

the IQ-400 must not be used for diving with “Nitrox” or other

mixed gases.

depth

time

Figure 1.2

Recommended Proﬁle

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Tusa Imprex II IQ400 Manual

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