INSPECTING THE RESPIRATOR
22 P/N 595360-01 Rev G 202004
• If the SCBA is equipped with a PASS device, the lights in the HUD will flash in an alternating pattern when the
distress alarm goes into pre-alarm mode. In addition, the color of the light illuminating the gauge dial will be the
same as the current cylinder level light showing in the HUD.
• The HUD has an automatic brightness control that dims the display in low-light situations and returns the display
to full brightness in bright-light situations.
• When the batteries require changing, the low-battery indicator at the right of the display lights for 20 seconds
and then begin to flash once per second.
When the low battery indicator is actuated, the batteries still have sufficient life to operate the HUD for a period
longer than the longest duration cylinder installed on the respirator. However, you must change the batteries im-
mediately upon termination of use of the respirator or before reentry into a hazardous atmosphere. See
“Chapter 4: Replacing Batteries” on page 51.
Table 1-1 summarizes the operation of the HUD lights:
WARNING
When an end-of-service indicator alarm actuates, leave the area requiring respiratory protection
immediately. Actuation of any end of service indicator alarm indicates that approximately 33% of full
pressure remains in the air supply cylinder (i.e., 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
serious injury or death.
BEHAVIOR OF LIGHTS MEANING USER ACTION
2 glowing green lights Full Cylinder Continue using respirator
1 glowing green light 3/4 full Cylinder Continue using respirator
1 slowly flashing yellow light 1/2 full Cylinder Continue using respirator
1 rapidly flashing red light 1/3 full Cylinder Leave hazardous area immediately
Table 1-1 Heads-Up Display Indicator Lights
WARNING
If the HUD lights do not operate as described, do not use the respirator. Remove the respirator from service
and tag it for repair by authorized personnel. Use of a respirator with a malfunctioning HUD may result in
serious injury or death.
WARNING
If a respirator incorporating the HUD is used in an explosive or flammable atmosphere, regularly inspect the
respirator, including the HUD, as described and correct any damage found. Do not substitute any parts or
components. Use only the batteries specified in this manual. The failure to correct any damage, the
installation of incorrect batteries, or the substitution of any other parts or components may impair the
intrinsic safety of the unit and may result in serious injury or death.
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