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8. Check alarm reset: While in full alarm, fully depress reset button,
release, and depress again. The SEMS PDA distress alarm shall
reset to the automatic mode. The loud alarm shall stop and the
red flashing lights shall be replaced by green flashing lights.
9. Check continuing operation of the SEMS PDA distress alarm:
After finishing all respirator checks involving air flow, turn off cylin-
der valve (push in and turn clockwise), purge all residual pressure
in respirator (open purge valve and wait for air flow to stop, close
purge valve). The SEMS PDA distress alarm shall remain active
with green light flashing. Do not move respirator, pre-alarm shall
occur with 20 seconds. Move respirator slightly, pre-alarm shall
reset, green lights shall start flashing again.
10. Check operation of end of service time indicator:
a) Open cylinder valve again to charge system, then push in and
rotate cylinder valve knob clockwise to close.
b) When cylinder valve is fully closed, open purge valve slightly
to vent residual air pressure from system.
c) As the residual air pressure vents from the system, the remote
pressure gauge needle will swing from “FULL” and move to-
wards “EMPTY.” Close the purge valve when the gauge needle
crosses the “¼” mark but before the beginning of the red
“EMPTY” band. The end of service indicator alarms shall actu-
ate along with the SEMS PDA electronic end of service time
indicator.
d) After verifying that all alarms are functioning (the SEMS PDA
electronic end of service time indicator will flash in the display
“LOW AIR”) open the purge valve slightly to vent the remain-
ing residual air pressure from the system. All alarms shall cease
operation when the system pressure drops to zero except the
electronic end of service time indicator.
e) To terminate the electronic end of service time indicator, press
the Reset button on the Control Console twice after the flash-
ing green light sequence. When air flow stops completely, re-
turn purge valve to the fully closed position (pointer on knob
upward).
11. Turn SEMS PDA distress alarm off: With cylinder valve closed
and all residual air purged from respirator (see step 9 above) de-
press reset button twice (press, release and press again) and then
twice again after the flashing green light sequence. The display
will say “OFF,” the unit will sound a quick two tone chirp and the
SEMS PDA distress alarm will be inactive. The SEMS PDA dis-
tress alarm is now in the “OFF” condition.
NOTE
IF THERE IS STILL RESIDUAL PRESSURE IN THE SYSTEM, THE
UNIT WILL REMAIN “ON” IN AUTOMATIC MODE.
INSPECTION OF SEMS PDA PORTABLE UNIT
When installed on a SCOTT SCBA, inspection and test of the SCOTT
SEMS PDA Portable Unit is to be conducted along with inspection
and test of the respirator and the SEMS PDA distress alarm before
each use. To do this, the REGULAR OPERATIONAL INSPECTION
procedures in your respirator instructions will require modification. The
instructions below are to be
added to the instructions for REGULAR
WARNING
IF THE LOW BATTERY INDICATION OCCURS AT
ANY TIME DURING REGULAR OPERATIONAL
INSPECTION, DO NOT USE THE RESPIRATOR.
CHANGE ALL BATTERIES IMMEDIATELY AND
REPEAT THE REGULAR OPERATIONAL TEST
OR TAKE THE RESPIRATOR OUT OF SERVICE
UNTIL THE BATTERIES ARE CHANGED AND
THE REGULAR OPERATIONAL TEST IS SUC-
CESSFULLY PERFORMED. USE OF A RESPI-
RATOR WITH DEPLETED BATTERIES MAY
LEAD TO A FAILURE OF THE RESPIRATOR
WHICH COULD RESULT IN SERIOUS INJURY
OR DEATH.