Suunto HelO2 [15/64] Audible and visual alarms
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Suunto HelO2 [15/64] Audible and visual alarms

Suunto HelO2 [15/64] Audible and visual alarms
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 reasonAlarm indication
PO
2
value is greater than the adjusted value.
Current depth is too deep for the gas in use.
You should immediately ascend or change
to a gas with a lower oxygen percentage.
Three beeps with a one second interval for
the maximum of three minutes. The PO
2
value blinks.
PO
2
value is smaller than 0.18 bar. The
depth is too shallow and the ambient pres-
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.
Three beeps with a one second interval for
the maximum of 24 seconds. The PO
2
value
blinks.
In MIXED GAS mode, the OLF value
reaches the fixed 80% or 100%. You can
acknowledge the alarm.
Two beeps with a one-and-a-half second
interval. The OLF% value blinks if the PO
2
value is greater than 0.5 bar.
Decompression ceiling depth is exceeded.
You should immediately descend to, or be-
low, the ceiling.
Two beeps with a one-and-a-half second
interval for three minutes. The Er symbol
blinks and an arrow points downwards.
Mandatory safety stop is violated. You
should immediately descend.
Two beeps with a one-and-a-half second
interval for three minutes. An arrow points
downwards.
Maximum allowed ascent rate, 10 m per min
/ 33 ft per min, is exceeded.
Three beeps with a one second interval for
24 seconds. The SLOW symbol blinks.
Mandatory deepstop is violated. You should
immediately descend.
Two beeps with a one and a half second in-
terval for the duration of the deepstop viola-
tion. DEEPSTOP blinks and an arrow points
downwards.
Cylinder pressure reaches the selected
alarm pressure, 10 - 200 bar.
Two beeps with a one-and-a-half second
interval. Tank pressure blinks.
Cylinder pressure reaches the fixed alarm
pressure, 50 bar.
No-decompression dive turns into a decom-
pression stop dive.
Two beeps with a one-and-a-half second
interval for 24 seconds. ASC TIME blinks
and an arrow points upwards.
Depth is below the decompression floor
level. You should immediately ascend to, or
above, the floor.
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.
Two beeps with a one-and-a-half second
interval. Gas mix value (O
2
%, O
2
%|He%)
blinks.
The deepstop depth is reached. Make the
mandatory deepstop for the duration shown
by the timer.
Three beeps with a one second interval.
15

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