Suunto Cobra3 — nitrox Diving: Safety, Risks, and Dive Computer Alarms Explained [17/60]
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Suunto Cobra3 — nitrox Diving: Safety, Risks, and Dive Computer Alarms Explained [17/60]

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Suunto Cobra3 [17/60] Nitrox
5.4. Nitrox
Diving with nitrox provides you with an opportunity to increase bottom times or reduce the
risk of decompression illness by reducing the nitrogen content in the gas mix.
However, when the gas mix is altered, the oxygen content of the mix is generally increased.
This increase exposes the diver to an oxygen toxicity risk not usually considered in
recreational diving. In order to manage this risk, the dive computer tracks the time and
intensity of the oxygen exposure and provides the diver with information to adjust the dive
plan in order to maintain oxygen exposure within reasonably safe limits.
In addition to the physiological effects of enriched air on the body, there are operational
considerations to be addressed when handling altered breathing mixes. Elevated
concentrations of oxygen present a fire or explosion hazard. Consult the manufacturer of
your equipment to check its compatibility with nitrox.
5.5. Audible and visual alarms
The dive computer has audible and visual alarms that advise when important limits are
approached or that prompt you to acknowledge preset alarms. The table below describes
the different alarms and their meanings.
Table 5.1. Audible and visual alarm types
Alarm reasonAlarm type
Dive computer is activated.Short single beep
Dive computer automatically returns to the TIME mode.
Cylinder pressure reaches 50 bar/725 psi. The cylinder
pressure display will start to blink.
Three beeps with a three
second interval
Cylinder pressure reaches the selected alarm pressure.
Calculated remaining air time reaches zero.
No-decompression dive turns into a decompression stop
dive. An arrow pointing upwards and the blinking ascent
warning ASC TIME will appear.
Three beeps with a three
second interval and activated
backlight
Maximum allowed ascent rate, 10 m per min/33 ft per
min, is exceeded. Ascent rate bar graph blinks and STOP
warning appears.
Continuous beeps and
activated backlight
Decompression ceiling depth is exceeded. An error
warning Er and a downward pointing arrow appear. You
should immediately descend to, or below, the ceiling.
The instrument will otherwise enter a permanent Error
mode within three minutes, indicated by a permanent Er.
You can set alarms for maximum depth, dive time and tank pressure. See also Section 5.8.
DIVE mode settings and Section 4.1. TIME mode settings.
Table 5.2. Preset alarm types
Alarm reasonAlarm type
Preset maximum depth has
been exceeded.
Continuous beep series for 24 seconds
Maximum depth blinks as long as the current depth value
exceeds the preset value.
Preset dive time has been
exceeded.
Continuous beep series for 24 seconds or until any
button is pressed.
Dive time blinks for one minute.
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Discover the benefits and risks of nitrox diving, including oxygen toxicity and how dive computers help manage exposure. Learn about alarm systems for safe diving.