Dräger LFB PSS 7000 - Page 75

Appendix 4
476 Issue date: 17 November 2006 75 of 80
BREATHE DOWN SEQUENCE
EV
CHECK IN ORDER
P
NYP
36
OPEN the cylinder valve SLOWLY and FULLY.
37
DISCONNECT neck loop retaining stud,
WIPE the face mask seal and inner mask with a damp PALTECH wipe.
DON face mask, drop the head forward into the face mask placing the chin firmly into the chin
cup.
POSITION the head harness over the head, locating the harness centre plate square on the
back of the head. Ensure that hair does not compromise the face seal area.
ADJUST the straps, lower two first, then middle two and top one (if required).
BREATHE normally.
38
TEST the constant flow of air to face mask by briefly operating the additional flow button on the
front of the LDV once only.
39
TAKE a deep breath and hold, do not move head.
LISTEN for any leakage from the face mask for approximately 8 seconds and then,
BREATHE normally.
40
TAKE a deep breath and hold.
CLOSE the cylinder valve; continue to hold onto the valve.
41
TAKE HOLD of the Bodyguard in other hand and,
OBSERVE display for approximately 8 seconds whilst slowly moving your head
up, down and side-to-side.
ENSURE the face mask is not leaking outwardly (positive pressure).
This will be noted by an excessive fall in pressure.
42
After 8 seconds slowly BREATHE DOWN the contents.
43
OBSERVE and LISTEN to the low pressure warnings:
 The electronic low pressure warning and the red and blue LEDs flashing (operates at
84 bar).
 The pneumatic low pressure warning (operates at 74 bar +/- 5 bar).
Note: both must be heard to actuate.
44
When zero is displayed (0 bar):
OPEN the cylinder valve SLOWLY and FULLY and breathe normally.
NOTE pressure displayed and round down for entry onto the BA tally at EV 50.
45
TAKE a deep breath and hold.
CLOSE the cylinder valve; continue to hold onto the valve.
F6187 (January 2020, version 8)