SUUNTO Cobra - Manual (Page 72)

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Oxygen Tolerance Unit
Is used to measure the Whole-Body-Toxicity.
Oxygen Limit Fraction
A term used by SUUNTO for the values displayed in the
Oxygen Toxicity bargraph. The value is either the CNS% or
the OTU%.
O
2
% Oxygen percentage or oxygen fraction in the breathing gas.
Standard air has 21% oxygen.
Oxygen partial pressure
Limits the maximum depth to which the used Nitrox mixture
can safely be used. The maximum partial pressure limit for
enriched air diving is 1.4 bar. The contingency partial pressure
limit is 1.6 bar. Dives beyond this limit have the risk for
immediate oxygen toxicity.
PO
2
Abbreviation for oxygen partial pressure.
RGBM Abbreviation for Reduced Gradient Bubble Model.
Reduced Gradient Bubble Model
Modern algorithm for tracking both dissolved and free gas in
divers.
Repetitive dive Any dive whose decompression time limits are affected by
residual nitrogen absorbed during previous dives.
Residual nitrogen The amount of excess nitrogen remaining in a diver after one
or more dives.
SURF TIME Abbreviation for surface interval time.
Surface interval time Elapsed time between surfacing from a dive and beginning a
descent for the subsequent repetitive dive.
Tissue group Theoretical concept used to model bodily tissues for the
construction of decompression tables or calculations.
Whole-Body Toxicity Another form of oxygen toxicity, which is caused by prolonged
exposure to high oxygen partial pressures. The most common
symptoms are irritation in the lungs, a burning sensation in the
chest, coughing and reduction of the vital capacity. Also called
Pulmonary Oxygen Toxicity. See also OTU.