Suunto HELO2 manual Audible and visual alarms, Alarm indication Alarm reason

5.6. 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 indication	Alarm reason
Three beeps with a one second interval for	PO2 value is greater than the adjusted value.
the maximum of three minutes. The PO2	Current depth is too deep for the gas in use.
value blinks.	You should immediately ascend or change
	to a gas with a lower oxygen percentage.
Three beeps with a one second interval for	PO2 value is smaller than 0.18 bar. The
the maximum of 24 seconds. The PO2 value	depth is too shallow and the ambient pres-
blinks.	sure is too low for the current gas. The oxy-
	gen content is too low to keep you con-
	scious. You should immediately switch the
	gas.

Two beeps with a one-and-a-half second interval. The OLF% value blinks if the PO2 value is greater than 0.5 bar.

Two beeps with a one-and-a-half second interval for three minutes. The Er symbol blinks and an arrow points downwards.

Two beeps with a one-and-a-half second interval for three minutes. An arrow points downwards.

In MIXED GAS mode, the OLF value reaches the fixed 80% or 100%. You can acknowledge the alarm.

Decompression ceiling depth is exceeded. You should immediately descend to, or be- low, the ceiling.

Mandatory safety stop is violated. You should immediately descend.

Three beeps with a one second interval for 24 seconds. The SLOW symbol blinks.

Maximum allowed ascent rate, 10 m per min / 33 ft per min, is exceeded.

Two beeps with a one and a half second in- Mandatory deepstop is violated. You should terval for the duration of the deepstop viola- immediately descend.

tion. DEEPSTOP blinks and an arrow points downwards.

Two beeps with a one-and-a-half second interval. Tank pressure blinks.

Two beeps with a one-and-a-half second interval for 24 seconds. ASC TIME blinks and an arrow points upwards.

Cylinder pressure reaches the selected alarm pressure, 10 - 200 bar.

Cylinder pressure reaches the fixed alarm pressure, 50 bar.

No-decompression dive turns into a decom- pression stop dive.

Depth is below the decompression floor level. You should immediately ascend to, or above, the floor.

Two beeps with a one-and-a-half second interval. Gas mix value (O2%, O2%He%) blinks.

Three beeps with a one second interval.

Gas change is required. You should imme- diately change to a gas more favorable to decompression. ASC TIME assumes that the gas is changed immediately and is accur- ate only if you change the gas.

The deepstop depth is reached. Make the mandatory deepstop for the duration shown by the timer.

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