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2. Depress the SEMS PDA distress alarm retaining spring and slide
the Sensor Module from Backframe as shown in FIGURE 6.
3. Turn Sensor Module over to expose the battery cover, shown in
FIGURE 7 and replace batteries as instructed in paragraphs 5
through 9 of this section.
FIGURE 6
RETAINING SPRING
REMOVE
DEPRESS
FIGURE 7
BATTERY COVER
COVER SCREW (4 PLACES)
BATTERY REPLACEMENT
SEMS PDA DISTRESS ALARM PORTABLE UNIT
Three batteries are required to operate the SEMS PDA Distress Alarm
Portable unit: two in the Sensor Module assembly and one in the Con-
trol Console. It is recommended to replace ALL batteries at the
same time. To change batteries, place the respirator in a clean, non-
hazardous area. Close respirator cylinder valve, open regulator purge
valve letting out all the trapped air, close regulator purge valve, press
the reset button twice and twice again after the flashing green light
sequence. Display will say “OFF”, unit will sound a two tone chirp and
green light will go out.
NOTE
ALWAYS BE SURE THAT CYLINDER VALVE IS OFF AND SEMS
PDA DISTRESS ALARM IS COMPLETELY INACTIVE BEFORE
CHANGING BATTERY. NEVER REMOVE OR REPLACE BATTERY
WITH SYSTEM PRESSURIZED OR DAMAGE MAY OCCUR TO
ELECTRONIC COMPONENTS.
BACKFRAME BATTERIES
1. When replacing batteries on respirators equipped with Backframe,
P/N 804415-XX, remove the cylinder and position the respirator
with the Sensor Module facing upward as shown in FIGURE 6.
CAUTION
SYSTEM MUST NOT BE PRESSURIZED
WHEN BATTERIES ARE INSTALLED.
DAMAGE TO THE ELECTRONIC COMPO-
NENTS MAY RESULT IF BATTERIES ARE IN-
STALLED WITH SYSTEM PRESSURIZED.
WARNING
THE SEMS PDA DISTRESS ALARM IS IN-
TENDED TO ASSIST IN LOCATING A PER-
SON WHO MAY BE IN A LIFE THREATEN-
ING SITUATION. FAILURE TO FOLLOW
THE INSTRUCTIONS FOR OPENING,
CHANGING ALL BATTERIES AND RE-CLOS-
ING BOTH BATTERY COMPARTMENTS MAY
RESULT IN DAMAGE WHICH COULD CAUSE
FAILURE OF THE PASS DURING A LIFE
THREATENING EMERGENCY OR COULD
CAUSE A FIRE OR EXPLOSION IN A FLAM-
MABLE OR EXPLOSIVE ATMOSPHERE POS-
SIBLY RESULTING IN SERIOUS INJURY OR
DEATH.