Scott AIR-PAK 75 Operating & Maintenance Instructions page 18

REGULAR OPERATIONAL INSPECTION CONTINUED...
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-THIRd. 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. If the lights do not
operate as described here, do not use the respirator. Remove the
respirator from service and tag for repair by authorized personnel.
3/4 GREEN
LIGHT
1/2 YELLOW LIGHT
(FLASHING SLOWLY)
1/3 RED LIGHT
(FLASHING
RAPIDLY)
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-THIRd 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 ImmE-
dIATELY.
3. The HEAdS-uP dISPLAY has an automatic brightness control that
dims the dISPLAY in low light situations and returns the dISPLAY to
full brightness in bright light situations.
4. When the batteries require 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 batteries still have sufficient life
to operate the HEAdS-uP dISPLAY longer than the longest dura-
tion 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.
P/N 595252-01 Rev. B 5/14
FULL GREEN
LIGHT
FIGURE 8
HEADS-UP DISPLAY
Page 18 of 48
I F T H E H E A D S - U P D I S P L AY L I G H T S
D O N O T O P E R AT E A S D E S C R I B E D I N
THESE INSTRUCTIONS, DO NOT USE THE
RESPIRATOR. REMOVE THE RESPIRATOR
FROM SERVICE AND TAG FOR REPAIR
BY AUTHORIZED PERSONNEL. USE OF A
RESPIRATOR WITH A MALFUNCTIONING
H E A D S - U P D I S P L AY M AY R E S U LT I N
SERIOUS INJURY OR DEATH.
LOW BATTERY
WARNING
(RED)
I F A R E S P I R AT O R I N C O R P O R AT I N G
THE HEADS-UP DISPLAY IS USED IN AN
ExPLOSIVE OR FLAMMABLE ATMOSPHERE,
REGULARLY INSPECT THE RESPIRATOR,
I N C L U D I N G T H E H E A D S - U P D I S P L AY,
A S D E S C R I B E D I N T H I S I N S T R U C T I O N
A N D C O R R E C T A N Y D A M A G E F O U N D .
D O N O T S U B S T I T U T E A N Y PA R T S O R
COMPONENTS. USE ONLY THE BATTERIES
AS SPECIFIED IN THIS INSTRUCTION. THE
FAILURE TO CORRECT ANY DAMAGE, THE
INSTALLATION OF INCORRECT BATTERIES,
OR THE SUBSTITUTION OF ANY OTHER
COMPONENTS MAY IMPAIR THE INTRINSIC
SAFETY OF THE UNIT AND MAY LEAD TO
A FIRE OR AN ExPLOSION WHICH COULD
RESULT IN SERIOUS INJURY OR DEATH.
THE RESPIRATOR USER MUST IMMEDIATELY
LEAVE THE AREA REQUIRING RESPIRATORY
PROTECTION WHEN AN END OF SERVICE
INDICATOR ALARM ACTUATES. ACTUATION
O F A N Y E N D O F S E RV I C E I N D I C ATO R
ALARM WARNS THAT APPROxIMATELY
33% O F F U LL P R E SS U R E R EM A IN S I N
TH E A I R S U P PLY C YL IN D E R ( TH AT IS,
APPROxIMATELY 2/3 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 INJURY
OR DEATH.
WARNING
WARNING
WARNING