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6.3. OXYGEN EXPOSURE
The oxygen exposure calculations are based on currently accepted exposure time
limit tables and principles. In addition to this the dive computer uses several meth-
ods to conservatively estimate the oxygen exposure. These include for example:
- the displayed oxygen exposure calculations are upped to the next higher
percentage value
- for recreational scuba diving, the recommended upper limit of 1.4 bar PO
2
is used as a default
- the CNS% limits up to 1.4 bar are based on 1991 NOAA Diving Manual
limits, but the limits above 1.4bar are signifi cantly shortened
- the OTU monitoring is based on the long-term daily tolerance level and the
recovery rate is reduced
Oxygen related information displayed by the di ve computer is also designed to
ensure all warnings and displays in the appropriate phases of a dive. E.g. the fol-
lowing information will be shown before and during a dive, when the computer
is set in Nitrox mode:
- the selected O
2
%
- the color-coded OLF% bar graph for either CNS% or OTU%
- audible alarms are given and the OLF bar graph starts to blink when the
80% and 100% limits are exceeded
- the blinking of the bar graph stops, when the PO
2
is below 0.5 bar
- audible alarms are given and the actual PO
2
value blinks when it exceeds
the preset limit
- in dive planning the maximum depth according to the O
2
% and maximum
PO
2
selected.
6.4. TECHNICAL SPECIFICATION
Dimensions and weight:
- Diameter: 61mm [2.4in].
- Thickness: 28mm [1.1in].
- Weight: 68g [2.4 oz].
Depth Gauge:
- Temperature compensated pressure sensor.
- Salt water calibrated, in fresh water the readings are about 3% smaller (cali-
brated complying with EN 13319).
