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Once activated, the SCOTT SEMS PDA distress alarm will remain
activated until:
1. The respirator air cylinder is turned off with the residual air pres-
sure purged from the regulator
2. The reset button on the control module has been pressed twice.
In the automatic mode the SCOTT SEMS PDA distress alarm con-
stantly monitors motion of the respirator backframe. The motion sen-
sor is located in the Sensor Module along with the audible alarm. If
the Sensor Module does not sense motion of the respirator for 20
seconds the SEMS PDA distress alarm will signal a pre-alarm condi-
tion. If there is still no motion of the respirator for the next 12 seconds
the full alarm will sound.
PRE ALARM:
Once the respirator is pressurized, the SEMS PDA distress alarm will
automatically sound a pre-alarm if the respirator remains motionless
for more than 20 seconds.
When the pre-alarm occurs, the green flashing lights on the Control
Console and backframe are replaced by bright red lights which flash
approximately once a second and are accompanied by an ascending/
descending audible tone which increases in volume during the pre-
alarm cycle.
If the user is not incapacitated or not in need of assistance, the pre-
alarm is normally reset by movement of the respirator. When reset,
the flashing red lights will be replaced by the flashing green lights and
the ascending/descending tone will stop.
A pre-alarm may also be reset by pressing and holding the reset but-
ton on the side of the Control Console until three (3) quick audible
chirps are heard and the red flashing lights on the Control Console
and backframe are replaced by the green flashing lights.
Remember that the motion sensor is in the Sensor Module under the
air cylinder valve and not in the Control Console so that actual move-
ment of the respirator backframe is required for reset. Shaking the
Control Console will not reset the SEMS PDA distress alarm .
FULL ALARM:
If the user is incapacitated or in need of assistance and can not move,
the SEMS PDA distress alarm will go into full alarm 12 seconds after
the pre-alarm starts.
Full alarm is indicated by a loud, almost continuous 3 tone chirp from
the Sensor Module accompanied by the flashing of the red signal lights
on the Control Console and "PASS" will appear in the display. The full
alarm condition can only be cleared by manually pressing twice on the
reset button, located on the side of the Control Console, shown in
FIGURE 3.
After the full alarm has been silenced by pressing the reset button,
releasing it and pressing it again, the SEMS PDA distress alarm will
remain activated with the green lights flashing once every 2 seconds.
In the activated or "automatic" mode, it will again go into pre-alarm
followed by full alarm unless there is movement of the respirator at
least once every 20 seconds as long as the respirator is pressurized.
AND
9
WARNING
USERS OF RESPIRATORS EQUIPPED WITH
THE SEMS PDA DISTRESS ALARM MUST BE
AWARE OF THE PROPER OPERATION OF
THE DISTRESS ALARM. IF THE GREEN LIGHT
IS NOT FLASHING NORMALLY, OR IF THE UNIT
EXHIBITS ANY OTHER SIGNS OF A MALFUNC-
TION WITHOUT THE USER TAKING PROPER
CORRECTIVE ACTION, IT MAY LEAD TO CIR-
CUMSTANCES THAT RESULT IN SERIOUS IN-
JURY OR DEATH.
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