INTERSPIRO S9 - 6 During Use Operations; PASS System Modes and Low Air Warnings

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6 DURING USE
6.1 PASS SENSING MODE
In this mode the Digital Display Unit (DDU) is active showing the cylinder pressure
symbol, the PASS is activated and the HUD displays pressure according section 3.1.
The LEDs on the DDU and BAC are ashing yellow to indicate PASS Sensing mode
and to act as location lights.
Check cylinder pressure indication from time to time when using the apparatus.
6.2 PASS PRE-ALERT
After 20-25 seconds of non-movement the unit enters the PASS pre-alert mode. In this
mode escalating sound beeps start and LEDs on the DDU and BAC alternate between
ashing yellow and ashing red. The right hand side red LED in the HUD ashes.
By moving the DDU the unit returns to PASS sensing mode.
6.3 PASS ALARM
After 30-35 seconds the unit enters the alarm mode. In this mode an alarm signal is
started and the LEDs on the DDU and BAC are pulsing yellow and red. The right hand
side red LED in the HUD is lit.
The unit can be put into PASS alarm mode at any time by pressing the red alarm
button.
To re-set the PASS to Sensing mode, press the black backlight button two times or
press and hold the black backlight button and then simultaneously press the red alarm
button.
6.4 LOW AIR WARNINGS
The user should be aware to begin planning to exit the hazardous environment when
the HUD starts to indicate 50% cylinder pressure (see section 3.1), or possibly even
earlier according the optional “Dynamic Turn back signal” and the NFPA 1404 air
management note below.
The unit can have the optional “Dynamic Turn back signal” activated. This signal
activates at a level automatically calculated by the SCBA , the level is set halfway
between the initial starting pressure and the low air warning level.
In addition to the ashing yellow and red LEDs in the HUD at 50% cylinder pressure
or at the “Dynamic Turn Back signal” level, the backlight of the DDU is automatically
illuminated in red for 10 seconds.
At cylinder pressures above the this level, the backlight is illuminated in the color
yellow when the backlight button is pressed. At cylinder pressures below this level the
backlight color is red when the backlight button is pressed.
When the air supply has dropped to 33% the mechanical whistle starts to sound,
the HUD indicates 33% remaining cylinder pressure (see section 3.1) and the LEDs