MSA ICU Mode D'emploi page 11

No. of times
green button LCD shows before 3 ½ minutes or no consumption
is pressed
0 (initial state) pressure display not lit
1 x press pressure display lit
2 x press temperature display lit
3 x press lit "---" with clock symbol
4 x press pressure display lit
Note:
If the mode button is not repressed within 15 seconds, the device
switches back to initial state (remaining service time display including
clock symbol, resp. pressure display not lit).
7.5 Retreat Alarm
The retreat alarm can be entered manually by the user.
To do this, the yellow button must be pressed without interruption for
2 seconds when the work site has been reached.
Storage of this value in the memory is acknowledged by the device
with an audible signal.
Note:
The programmed value can be actualized by repressing the yellow button
later for 2 seconds (max. 3 times).
Explanation:
The ICU stores the pressure difference from opening the cylinder(s) until
the pressing of the yellow button (arrival at work site). This difference is
the air requirement for getting to the work site. According to fire fighting
regulations, double this air consumption must be planned for retreat.
Once the cylinder pressure has dropped to this value, the device gives
alarm to alert the user to start retreat.
Note:
The device will give a retreat alarm only if this is higher than 60 (e. g. at
80 bar). Otherwise only the 60 bar alarm will sound. The retreat alarm
can be acknowledged by pressing the yellow button twice. Independent
there of the latching 60 bar alarm, resp. the 100 bar alarm will sound.
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