11
HEADS-UP DISPLAY OPERATION
The 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 initial-
ize and display either one (1) red light for 2216 psi system or one
(1) green light for a 4500 psi system. If the installed cylinder pres-
sure is above 200 psi, this will be followed by the illumination of
all five lights for twenty (20) seconds. Operation of all five lights
must be verified every time respirator use is begun and with ev-
ery 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 indi-
cated by the red light at the far left flashing rapidly at ten times
a second. WHEN THIS WARNING LIGHT IS FLASHING RAP-
IDLY, THE USER MUST LEAVE THE HAZARDOUS ATMO-
SPHERE IMMEDIATELY.
3. When the batteries require changing, the round LOW BATTERY
indicator at the far 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 batteries still have
sufficient life to operate the HEADS-UP DISPLAY longer than the
longest duration cylinder installed on the respirator. However, the
batteries 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 IMMEDI-
ATELY LEAVE THE AREA REQUIRING RES-
PIRATORY 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 RE-
MAINS 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 RE-
SULT IN SERIOUS INJURY OR DEATH.
WHAT THEY MEANINDICATOR 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
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