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Suunto EON Steel User Guide - 1.6

  • Alarms, warnings and notifications

Alarms, warnings and notifications

Suunto EON Steel has color-coded alarms, warnings and notifications. They are shown prominently on the display with an audible alarm (if tones are on). Alarms are always red. Warnings may be red or yellow. Notifications are always yellow.

When an alarm, warning, or notification occurs, a message is displayed as a pop-up. Pop-up messages can be acknowledged by pressing any button. The information needing attention remains on screen or as a scrollable element in the bottom field until the situation is back to normal.

Alarms are critical events that always require immediate action. When an alarm situation comes back to normal, the alarm will stop automatically.

AscSpeedAlertAscent speed exceeds safe speed of 10 m (33 ft) per minute for five seconds or more.
ErrorConditionDecompression ceiling broken by more than 0.6 m (2 ft) on a decompression dive. Immediately descend back below ceiling depth and continue to ascend normally.
alarm pO2highPartial pressure of oxygen exceeds safe level (>1.6). Immediately ascend or change to a gas with lower oxygen percentage.
alarm pO2low newPartial pressure of oxygen below safe level (<0.18). Immediately descend or change to a gas with higher oxygen percentage.

Warnings alert you to events that can impact your health and safety if you do not take action. Acknowledge the warning by pressing any button.

CNS100%Central nervous system toxicity level at 100% limit
OTU300Recommended daily limit for Oxygen tolerance unit reached
DepthDepth exceeds your depth alarm limit
Dive timeDive time exceeds your dive time alarm limit
Diluent high PO2Diluent partial pressure of oxygen exceeds safe level (>1.6); no immediate danger unless diluent is used, e.g. for bailout
Diluent low PO2Diluent partial pressure of oxygen below safe level (<0.18); no immediate danger unless diluent is used,e.g. for bailout
Gas timeGas time exceeds your gas time alarm limit, or tank pressure is below 35 bar (~510psi), in which case gas time is zero
Safety stop brokenSafety stop ceiling broken by more than 0.6 m (2 ft)
Tank pressureTank pressure is below your tank pressure alarm limit

Notifications indicate events that require preventive actions. Acknowledge the notification by pressing any button.

CNS80%Central nervous system toxicity level at 80% limit
OTU250Approximately 80% of recommended daily limit for OTU reached
Change gasOn multi-gas dive when ascending, it is safe to switch to next available gas for optimum decompression profile
Low batteryApproximately three hours of dive time left
Re-charge neededApproximately two hours of battery time left; re-charging required before next dive
Setpoint switchedSetpoint switched automatically on rebreather dive. See Setpoints
Tank POD low batteryTank POD battery life low; battery change required

Configurable alarms

There are four configurable alarms: depth, dive time, tank pressure, and gas time alarm. These alarm settings can be found under Diving settings / Alarms. Each of these alarms can have its own limit and be separately turned on or off.


Tank pressure reading turns red if it goes below 50 bar (720 psi).


Gas time reading shows zero and turns red if tank pressure goes below 35 bar (500 psi).

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