Continue to breathe down to a zero gauge reading, and then hold breathes.
At this point, if you have a satisfactory seal, face piece will collapse onto your face.
Inhale and exhale three times, hold your breath and listen for leaks.
If none are heard, press centre of rubber cover to check satisfactory supplementary supply – work can now commence.
Adopt this procedure to remove apparatus.
To removal face piece, pull forward with finger and thumb on each buckle; bottom strip first then upper straps.
Press re-set lever towards front cover of lung demand valve.
Remove face piece from face, and let it hang on chest.
Turn cylinder valve off, by pulling down and rotating hand wheel.
Apply pressure to centre of protective cover of lung demand valve, this will exhaust air from system.
Switch positive pressure facility off, by pressing re-set lever towards front cover of lung demand valve.
Release waist belt by pressing top and bottom clips, using finger and thumb.
Fully extend strap – next, release chest strap if fitted.
Ensure that shoulder straps are fully extended, by pushing shoulder strap buckles upwards.
Lift neck strap of face piece over head, then protecting face piece from damage.
Remove apparatus from shoulders and lay it down carefully.
