Testing The Heads-Up Display - 3M SCOTT AIR-PAK X3 PRO Inspection & Cleaning Instructions

8 When air flow stops completely, close the purge valve (the pointer on the knob points up).
9 Stop the electronic end-of-service time indicator by pressing the manual reset (yellow) button on the control
console twice and then twice again after the flashing green light sequence.

Testing the Heads-Up Display

The Heads-Up Display (HUD) provides a visual monitor of the air supply in the cylinder and valve assembly. The display
is fitted to the mask-mounted regulator and appears across the bottom of the user's field of view through the
facepiece.
The HUD consists of four rectangular lights to represent the cylinder pressure at full and three-quarters, one-half, and
one-third full. A fifth red light indicates low battery.
The HUD operates as follows:
•
When respirator use begins, the HUD will initialize and illuminate all lights for 20 seconds. Verify the operation of
all lights every time respirator use starts and with every regular operational inspection.
•
After initialization, the rectangular indicator lights show the level of the air supply in the cylinder (see
•
When the cylinder is more than three-quarters full, two green lights near the center of the display illuminate.
•
When the cylinder is between one-half and three-quarters full, a single green light illuminates.
•
When the cylinder is between one-third and one-half full, a yellow light flashes once per second.
•
When the cylinder is less than one-third full, a red light at the far left of the display (the end-of-service time
indicator) flashes 10 times per second.
1/3 - 1/2 full: Yellow light flashes slowly
< 1/3 full: Red light flashes rapidly
E-Z Flo Regulator HUD on AV-3000 HT
1/3 - 1/2 full: Yellow light flashes slowly
< 1/3 full: Red light flashes rapidly
E-Z Flo C5 Regulator HUD on Vision C5
P/N 595360-01 Rev G
> 3/4 full: 2 green lights
1/2 - 3/4 full: 1 green light
> 3/4 full: 2 green lights
1/2 - 3/4 full: 1 green light
Figure 1-9 HUD Operation
202004
PERFORMING OPERATIONAL TESTING
Low battery: Red
Low battery: Red
Figure 1-9):
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