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P/N 595236-01 Rev. B 10/11
HEADS-UP DISPLAY OPERATION
The optional HEADS-UP DISPLAY provides a visual monitor of the air
supply in the cylinder and valve assembly. The display is fitted to the
facepiece mounted regulator and appears across the bottom of the user's
field of view through the facepiece. The HEADS-UP DISPLAY consists
of four rectangular lights to represent the cylinder pressure at FULL,
THREE-QUARTERS, ONE-HALF, and ONE-QUARTER. A fifth round red
light indicates LOW BATTERY. The HEADS-UP DISPLAY operates as
follows:
1. When respirator use begins, the HEADS-UP DISPLAY will initialize
and illuminate all five lights for twenty (20) seconds. Operation of all
five lights must be verified every time respirator use is begun and
with every REGULAR OPERATIONAL INSPECTION.
2. After initialization, the rectangular indicator lights will show the level
of the air supply in the cylinder as follows:
a) FULL cylinder is indicated by the two green lights glowing near
the center of the display.
b) THREE-QUARTERS cylinder is indicated by a single green light
glowing.
c) ONE-HALF cylinder is indicated by the yellow light flashing slowly
at once a second.
d) ONE-QUARTER cylinder end of service time indicator is indicated
by the red light at the far left flashing rapidly at ten times a
second. WHEN THIS WARNING LIGHT IS FLASHING RAPIDLY,
THE USER MUST LEAVE THE HAZARDOUS ATMOSPHERE IM-
MEDIATELY.
3. When the battery requires changing, the round LOW BATTERY in-
dicator at the right of the display will light for twenty (20) seconds
and then begin to flash slowly at once a second. When the LOW
BATTERY indicator is actuated, the battery still has sufficient life
to operate the HEADS-UP DISPLAY longer than the longest dura-
tion cylinder installed on the respirator. However, the battery must
be changed immediately upon termination of use of the respirator,
or before reentry into a hazardous atmosphere. See the BATTERY
REPLACEMENT section of this instruction.
WARNING
THE RESPIRATOR USER MUST IMMEDIATE-
LY LEAVE THE AREA REQUIRING RESPI-
RATORY PROTECTION WHEN AN END OF
SERVICE INDICATOR ALARM ACTUATES.
ACTUATION OF ANY END OF SERVICE IN-
DICATOR ALARM WARNS THAT APPROXI-
MATELY 25% OF FULL PRESSURE REMAINS
IN THE AIR SUPPLY CYLINDER (THAT IS,
APPROXIMATELY 3/4 OF THE TOTAL AIR
SUPPLY HAS BEEN USED) OR THAT THERE
IS A MALFUNCTION IN THE RESPIRATOR.
A DELAY IN LEAVING THE AREA AFTER
ALARM ACTUATION MAY RESULT IN SERI-
OUS INJURY OR DEATH.
WHAT THEY MEAN
INDICATOR LIGHTS
WHAT YOU SHOULD DO
TWO LIGHTS GLOWING
ONE LIGHT GLOWING
ONE LIGHT FLASHING SLOWLY
ONE LIGHT FLASHING RAPIDLY
FULL CYLINDER
3/4 CYLINDER
1/2 CYLINDER
1/4 CYLINDER
CONTINUE USING RESPIRATOR
LEAVE HAZARDOUS AREA IMMEDIATELY
HEADS-UP DISPLAY QUICK GUIDE
FIGURE 1
HEADS-UP DISPLAY
FULL GREEN
LIGHT
3/4 GREEN
LIGHT
1/2 YELLOW
LIGHT
(FLASHING
SLOWLY)
1/4 RED
LIGHT
(FLASHING
RAPIDLY)
LOW BATTERY
WARNING
